Re: Bad HP436A power meter
Hello All!
Maybe someone has seen this: I have a bad HP436A power meter. I have a good one to test it against. The boards from the bad one, swapped one at a time into the good one, all test good. The bad meter has essentially a mainframe problem. It does not display? "-3" when no signal is input. It shows "1" and does not respond to the calibrator. The only active devices left are the display drivers and a 7404 on the front panel push button assy. It seems to me that it could well be the culprit. everything has been tested against a good head, cable and meter, so none of those is the problem. And if a display driver were bad, that would only affect the digit associated with it, right?? Something in the actual frame itself...
Anyone seen this before?
TIA
Jeff
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Gentlemen,
I have a Model 5340A frequency counter with the? 001 option ( High Stability Oscillator)?
This option is powered from a transformer Marked 9100-3021
One of the primary windings has gone open circuit and I need to replace the transformer.
I can't find the specifications for this transformer.
What I need to know is the voltage rating of the two secondary windings.
Looking at the schematic? on page 7-14 of the service manual leads me to suspect they are not the same value.
Can anyone help me identify what the secondary voltage is for each winding>
Thanks
David ??????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????????
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Re: E5071C the program can't working
It sounds like someone deleted the licenses before selling the instrument. ? Best bet is to contact Keysight Service, ? They may be able to restore the licensing or if the customer transferred the RTU licenses to another analyzer its likely that
it will be necessary to rebuy them. ? In which you have a parts machine as the licenses frequently are in the 5 figure range?
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Re: 8594E input attenuator issue?
Pad 4 is definitely messed up. ? I wonder if that outfit Greg just mentioned would sell parts for self-repair? ?
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From: [email protected] <[email protected]> On Behalf Of Nicolas Mailloux
Sent: Thursday, January 20, 2022 5:17 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?? Inducing 1v DC at the output with a 50 Ohm terminator (using a T adapter, one end is connected to terminator, the other is the DC feed through a 50ohm coax and the other end is connected to the output of the ATT). ? I get about the same readings : PAD 2 and 3 close to 51ohm, PAD 4 is 62ohm. ? ? 50-ohm termination is needed to get the correct attenuation but for measuring resistances it is not needed.?
From your earlier measurements it looks like:
PAD2 is 20dB section
PAD3 is 40dB section
PAD4 is 10dB section
If we treat each section as a pi attenuator (I don't know if it is valid with these units) expected values with open termination are?
10dB section (PAD4?)
input or output to ground 61.11ohm
Across 51.95
20dB section (PAD2?)
input or output to ground 51ohm
Across 81.8ohm
40dB section (PAD3?)
input or output to ground ~50ohm
Across 98-ohm
Doesn't look like there is a gross failure.?
Next you can do a DC attenuation check. Apply 1V DC to one side of 40dB attenuator and measure the voltage at the other side while terminating to 50-ohm. Correct voltage is 10mV, from scope measurements we expect wrong value of ~ 20mV. Then swap the input and output side and do the same.
This will tell at least at DC if the attenuation is correct.?
Ozan
?
?
On Thu, Jan 20, 2022 at 11:21 AM, Nicolas Mailloux wrote: Hi! I put a 50ohm termination on the input side and measured at the output. PAD 2 and 3 are giving 50 ohm, while PAD 4 is measuring 61.1 ohm as my previous measurements did. ? ? Remember that an attenuator must be terminated in 50 ohms to have the correct attenuation. You could do a simple test with your DMM, with the attenuator assembled (except for the cover over the control solenoids. Put a 50 ohm terminator on one side, and measure between center and screen on the other side. Move the solenoids, so only one pad is active at a time, and you should measure very close to 50 ohm on this connector. Of course with the exception of the DC-block. ? Ozan?: These measurements are from input to output. PAD 2 : 81.69 ohm PAD 3 : 98.04 ohm PAD 4 : 51.65 ohm ? These are from input to ground : PAD 2 : 51.05 ohm PAD 3 : 49.95 ohm PAD 4 : 60.96 Ohm ? There are from output to ground : PAD 2 : 51.10 PAD 3 : 50.16 PAD 4 : 61.23 ? ? On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote: n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached schematics. They may not be the right ones. ? My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz. Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings : They are in order from Input to Output. ? PAD 2 : 81.69 ohm PAD 3 : 98.04 ohm PAD 4 : 51.65 ohm ?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame.? Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side to ground??
Ozan
|
Re: 8594E input attenuator issue?
Inducing 1v DC at the output with a 50 Ohm terminator (using a T adapter, one end is connected to terminator, the other is the DC feed through a 50ohm coax and the other end is connected
to the output of the ATT).
?
I get about the same readings : PAD 2 and 3 close to 51ohm, PAD 4 is 62ohm.
?
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From: [email protected] <[email protected]>
On Behalf Of Ozan
Sent: 20 janvier 2022 14:42
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?
?
50-ohm termination is needed to get the correct attenuation but for measuring resistances it is not needed.?
From your earlier measurements it looks like:
PAD2 is 20dB section
PAD3 is 40dB section
PAD4 is 10dB section
If we treat each section as a pi attenuator (I don't know if it is valid with these units) expected values with open termination are?
10dB section (PAD4?)
input or output to ground 61.11ohm
Across 51.95
20dB section (PAD2?)
input or output to ground 51ohm
Across 81.8ohm
40dB section (PAD3?)
input or output to ground ~50ohm
Across 98-ohm
Doesn't look like there is a gross failure.?
Next you can do a DC attenuation check. Apply 1V DC to one side of 40dB attenuator and measure the voltage at the other side while terminating to 50-ohm. Correct voltage is 10mV, from scope measurements we expect wrong value of ~ 20mV. Then swap the input and
output side and do the same.
This will tell at least at DC if the attenuation is correct.?
Ozan
?
?
On Thu, Jan 20, 2022 at 11:21 AM, Nicolas Mailloux wrote:
Hi!
I put a 50ohm termination on the input side and measured at the output.
PAD 2 and 3 are giving 50 ohm, while PAD 4 is measuring 61.1 ohm as my previous measurements did.
?
?
Remember that an attenuator must be terminated in 50 ohms to have the correct attenuation.
You could do a simple test with your DMM, with the attenuator assembled (except for the cover over the control solenoids.
Put a 50 ohm terminator on one side, and measure between center and screen on the other side.
Move the solenoids, so only one pad is active at a time, and you should measure very close to 50 ohm on this connector.
Of course with the exception of the DC-block.
?
Ozan?: These measurements are from input to output.
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
These are from input to ground :
PAD 2 : 51.05 ohm
PAD 3 : 49.95 ohm
PAD 4 : 60.96 Ohm
?
There are from output to ground :
PAD 2 : 51.10
PAD 3 : 50.16
PAD 4 : 61.23
?
?
On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote:
n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions
on a previous post from someone that attached schematics. They may not be the right ones.
?
My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.
Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :
They are in order from Input to Output.
?
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame.? Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side
to ground??
Ozan
|
Re: 8594E input attenuator issue?
If you can all afford it and require precision operation of your spectrum analyzer these guys provide immaculate service for attenuators.? I have used them for repairs and receive back a like-new unit complete with parameter plots of the repaired device.
?
Dabbling while trying to repair these attenuators never leads to having a factory spec unit again.? These guys may be a bit pricey but it is well worth it.
?
?
Greg
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Re: 8594E input attenuator issue?
BTW, I was wrong about a 40 dB section, which I discovered after looking at the Service Guide. There is such a section in that model. I suspect that since it only had to meet performance specs up to 2.9 GHz, the leakage wasn’t a big issue. I am usually dealing with frequencies at 10 GHz or higher and that was what I was thinking here. Sorry. ? …罢辞尘 ?
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From: [email protected] <[email protected]> On Behalf Of n8zmTWH@...
Sent: Thursday, January 20, 2022 2:46 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?? The through readings will vary with the value of the attenuation, but the to-ground readings should all be close to 50 Ohms with a 50 Ohm termination in place, as you said you did. ? I took a quick look on Keysight’s website for that model of attenuator, and it is obsolete. There doesn’t seem to be a replacement recommendation. I ran out of time but will dig a little deeper to see if the substrates are still available for it. ? Tom. ? ? Ozan?: These measurements are from input to output. PAD 2 : 81.69 ohm PAD 3 : 98.04 ohm PAD 4 : 51.65 ohm ? These are from input to ground : PAD 2 : 51.05 ohm PAD 3 : 49.95 ohm PAD 4 : 60.96 Ohm ? There are from output to ground : PAD 2 : 51.10 PAD 3 : 50.16 PAD 4 : 61.23 ? ? On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote: n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached schematics. They may not be the right ones. ? My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz. Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings : They are in order from Input to Output. ? PAD 2 : 81.69 ohm PAD 3 : 98.04 ohm PAD 4 : 51.65 ohm ?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame. ?Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side to ground??
Ozan
|
Re: 8594E input attenuator issue?
The through readings will vary with the value of the attenuation, but the to-ground readings should all be close to 50 Ohms with a 50 Ohm termination in place, as you said you did. ? I took a quick look on Keysight’s website for that model of attenuator, and it is obsolete. There doesn’t seem to be a replacement recommendation. I ran out of time but will dig a little deeper to see if the substrates are still available for it. ? Tom. ?
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Show quoted text
From: [email protected] <[email protected]> On Behalf Of Nicolas Mailloux
Sent: Thursday, January 20, 2022 12:30 PM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?? Ozan?: These measurements are from input to output. PAD 2 : 81.69 ohm PAD 3 : 98.04 ohm PAD 4 : 51.65 ohm ? These are from input to ground : PAD 2 : 51.05 ohm PAD 3 : 49.95 ohm PAD 4 : 60.96 Ohm ? There are from output to ground : PAD 2 : 51.10 PAD 3 : 50.16 PAD 4 : 61.23 ? ? On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote: n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached schematics. They may not be the right ones. ? My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz. Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings : They are in order from Input to Output. ? PAD 2 : 81.69 ohm PAD 3 : 98.04 ohm PAD 4 : 51.65 ohm ?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame. ?Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side to ground??
Ozan
|
Re: 8594E input attenuator issue?
50-ohm termination is needed to get the correct attenuation but for measuring resistances it is not needed.?
From your earlier measurements it looks like:
PAD2 is 20dB section
PAD3 is 40dB section
PAD4 is 10dB section
If we treat each section as a pi attenuator (I don't know if it is valid with these units) expected values with open termination are?
10dB section (PAD4?)
input or output to ground 61.11ohm
Across 51.95
20dB section (PAD2?)
input or output to ground 51ohm
Across 81.8ohm
40dB section (PAD3?)
input or output to ground ~50ohm
Across 98-ohm
Doesn't look like there is a gross failure.?
Next you can do a DC attenuation check. Apply 1V DC to one side of 40dB attenuator and measure the voltage at the other side while terminating to 50-ohm. Correct voltage is 10mV, from scope measurements we expect wrong value of ~ 20mV. Then swap the input and output side and do the same.
This will tell at least at DC if the attenuation is correct.?
Ozan
?
?
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Show quoted text
On Thu, Jan 20, 2022 at 11:21 AM, Nicolas Mailloux wrote:
Hi!
I put a 50ohm termination on the input side and measured at the output.
PAD 2 and 3 are giving 50 ohm, while PAD 4 is measuring 61.1 ohm as my previous measurements did.
?
?
Remember that an attenuator must be terminated in 50 ohms to have the correct attenuation.
You could do a simple test with your DMM, with the attenuator assembled (except for the cover over the control solenoids.
Put a 50 ohm terminator on one side, and measure between center and screen on the other side.
Move the solenoids, so only one pad is active at a time, and you should measure very close to 50 ohm on this connector.
Of course with the exception of the DC-block.
?
Ozan?: These measurements are from input to output.
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
These are from input to ground :
PAD 2 : 51.05 ohm
PAD 3 : 49.95 ohm
PAD 4 : 60.96 Ohm
?
There are from output to ground :
PAD 2 : 51.10
PAD 3 : 50.16
PAD 4 : 61.23
?
?
On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote:
n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached schematics. They may not be the right ones.
?
My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.
Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :
They are in order from Input to Output.
?
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame.? Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side to ground??
Ozan
|
Re: 8594E input attenuator issue?
Hi!
I put a 50ohm termination on the input side and measured at the output.
PAD 2 and 3 are giving 50 ohm, while PAD 4 is measuring 61.1 ohm as my previous measurements did.
?
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Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Askild
Sent: 20 janvier 2022 13:23
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?
?
Remember that an attenuator must be terminated in 50 ohms to have the correct attenuation.
You could do a simple test with your DMM, with the attenuator assembled (except for the cover over the control solenoids.
Put a 50 ohm terminator on one side, and measure between center and screen on the other side.
Move the solenoids, so only one pad is active at a time, and you should measure very close to 50 ohm on this connector.
Of course with the exception of the DC-block.
?
Ozan?: These measurements are from input to output.
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
These are from input to ground :
PAD 2 : 51.05 ohm
PAD 3 : 49.95 ohm
PAD 4 : 60.96 Ohm
?
There are from output to ground :
PAD 2 : 51.10
PAD 3 : 50.16
PAD 4 : 61.23
?
?
On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote:
n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions
on a previous post from someone that attached schematics. They may not be the right ones.
?
My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.
Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :
They are in order from Input to Output.
?
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame.? Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side
to ground??
Ozan
|
Re: 8594E input attenuator issue?
Hi,
Remember that an attenuator must be terminated in 50 ohms to have the correct attenuation.
You could do a simple test with your DMM, with the attenuator assembled (except for the cover over the control solenoids. Put a 50 ohm terminator on one side, and measure between center and screen on the other side. Move the solenoids, so only one pad is active at a time, and you should measure very close to 50 ohm on this connector. Of course with the exception of the DC-block.
Regards, Askild
Ozan?: These measurements are from input to output.
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
These are from input to ground :
PAD 2 : 51.05 ohm
PAD 3 : 49.95 ohm
PAD 4 : 60.96 Ohm
?
There are from output to ground :
PAD 2 : 51.10
PAD 3 : 50.16
PAD 4 : 61.23
?
?
On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote:
n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached
schematics. They may not be the right ones.
?
My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.
Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :
They are in order from Input to Output.
?
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame.? Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side
to ground??
Ozan
|
Re: 8594E input attenuator issue?
Ozan?: These measurements are from input to output.
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
These are from input to ground :
PAD 2 : 51.05 ohm
PAD 3 : 49.95 ohm
PAD 4 : 60.96 Ohm
?
There are from output to ground :
PAD 2 : 51.10
PAD 3 : 50.16
PAD 4 : 61.23
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of Ozan
Sent: 20 janvier 2022 12:08
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?
?
On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote:
n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached
schematics. They may not be the right ones.
?
My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.
Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :
They are in order from Input to Output.
?
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
Both service manual and CLIP show 10dB/20dB/40dB sections.
The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame. ?Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side
to ground??
Ozan
|
Re: 8594E input attenuator issue?
On Thu, Jan 20, 2022 at 07:58 AM, Nicolas Mailloux wrote:
n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached schematics. They may not be the right ones.
?
My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.
Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :
They are in order from Input to Output.
?
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
Both service manual and CLIP show 10dB/20dB/40dB sections. The pads have three terminals, input/output/ground (input/output being symmetric). Ground is connected to the metal frame. ?Are above resistance measurements from one pad to ground? It may or may not tell much but what resistance do you measure from each side to ground?? Ozan
|
The 1854-0441 is NOT a diode. All 1854-.... parts are NPN transistors
Cheers!
Bruce
Quoting RubenRubio <rubenrb2019@...>:
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Show quoted text
Hello Francesco
In my xref lists I cannot found equivalent, so I did some google search about 1854-0404. Mr. Terrell wrote here in this forum:
"Michael A. Terrell
25.11.2018 #92882 ( /g/HP-Agilent-Keysight-equipment/message/92882 )
My notes suggest a 2N3904.
"1854-1293 as per Keysight as replacement for 1854-0071 . Part Description: Mod and Ser Nbr Reqd Transistor NPN VCE-25V IC-0.1A PD-0.625W silicon TO-92, Protected Supply 1854-0071 was a generic small signal NPN silicon transistor that was usuallly used wherever a grunt NPN was needed. A 2N3904 would be a good replacement. *1854-0404 was the same device but in a metal can*."
Michael A. Terrell"
And for the 1854-0441 I found this web page, that sugest it is a diode and shows some p/n: click here ( )
Maybe this can help you
Regards,
Ruben
|
HP 89441A / 89431A RF Section Help
My 89441A Vector Signal Analyzer has stopped working with its 89431A RF section, with an error message saying the reference oscillator is unlocked.? I have confirmed that there is no signal coming from the 89431A reference oscillator output that feeds the IF section.? The fault appears to be with the local oscillator (LO), and investigation shows a red overcurrent LED on the +8V supply with the voltage at the test point measuring about 4.8V.? Module A64 in the LO is drawing quite a bit of current, about 1 amp.? With the A64 module disconnected from the +8V supply there is a 10 MHz signal present at the reference oscillator output of the 89431A, although the overcurrent LED is still lit - the voltage reads about 7.5 V.? There could be multiple faults or perhaps a problem with the overcurrent detection circuit.
The A64 module is an amplifier containing two 1GG3-4205 devices, and each of them draws about the same amount of current.? I have been unable to find any information about this device and CLIP level diagrams are not available for the 89441A system from what I've found.? The 1GG3-4205 device now appears to be unobtainable.
Does anyone know if the 1GG3-4205 is supposed to draw about 500 mA?? If not, can anyone recommend a suitable substitution or workaround (I've read that someone has successfully substituted a Mini Circuits module on a different piece of equipment but which one isn't stated).? If it is normal for these devices to draw so heavily then it is possible that the overcurrent detection circuit in the power supply has a problem.? Without component level information all I have is HP house numbers and endless guesses as to what is actually going on.
Any suggestions would be appreciated - I just don't have enough information at this point to make any headway.? Thanks for reading :)
|
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Show quoted text
On Jan 20, 2022, at 02:20, RubenRubio <rubenrb2019@...> wrote:
? Hello Francesco
?
In my xref lists I cannot found equivalent, so I did some google search about 1854-0404. Mr. Terrell wrote here in this forum:?
My notes suggest a 2N3904.
"1854-1293 as per Keysight as replacement for 1854-0071 . Part Description: Mod and Ser Nbr Reqd Transistor NPN VCE-25V IC-0.1A PD-0.625W silicon TO-92, Protected Supply 1854-0071 was a generic small signal NPN silicon transistor that was usuallly used wherever a grunt NPN was needed. A 2N3904 would be a good replacement. 1854-0404 was the same device but in a metal can."
Michael A. Terrell"
And for the 1854-0441 I found this web page, that sugest it is a diode and shows some p/n:
Maybe this can help you
?
Regards,
Ruben
|
Re: 8594E input attenuator issue?
n8zmTWH@... : I do not have/searched the schematics of my particular ATT. I based my assumptions on a previous post from someone that attached schematics. They may
not be the right ones.
?
My exact model number is : 33321-60036 it goes to 70dB I think. My 8594E is from 9kHz to 2.9GHz.
Measuring the pads where the contact blades touch when selected, still in the aluminum block I get these readings :
They are in order from Input to Output.
?
PAD 2 : 81.69 ohm
PAD 3 : 98.04 ohm
PAD 4 : 51.65 ohm
?
?
?
toggle quoted message
Show quoted text
From: [email protected] <[email protected]>
On Behalf Of n8zmTWH@...
Sent: 20 janvier 2022 10:33
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?
?
Using the p-p amplitudes shown in the lower left corner of the screen, I calculate 20 dB where you said 40, and 30 dB where you said 50. Are you sure that is a 40
dB section, as that is kind of uncommon in the HP attenuators I’ve seen? They would usually get 40 by turning on two 20’s. Getting 40 dB across one section is asking a lot of the isolation across that section as the frequency goes higher.
?
?
I enabled FFT on my DSO. (It is a Rigol D1052E hacked to 100Mhz)
My TF 2015 is old and the maximum dB out I can get is theoretically -1dB (-7dB on the dials and a +6dB boost on CW Mode)
?
First picture shows without any attenuation
Second shows the 40dB attenuation
Third shows 40dB + 10dB attenuation.
?
I will clean contacts and re-measure later.
?
?
?
Nicolas,
If your DSO has an FFT function it could help in checking the higher attenuations.
--John Gord
On Wed, Jan 19, 2022 at 08:09 PM, <nicolas.mailloux@...> wrote:
Alright, I tried myself with a 3D printed plunger. It's not perfect, I would need to trim a bit on the top because it keeps the blade too low when engaged, but it's doable with time.
The broken plunger is at the capacitor. I booted up my vintage TF2015 Marconi RF generator, set it to 50Mhz and 15Mhz here are the results :
PIN 1 = DC BLOCK
PIN 2 = 20 dB
PIN 3 = 40 dB
PIN 4 = 10 dB
I fed +/- -20dBm to the ATT from the TF 2015. My DSO read +/-63.2mVpp without the ATT and +/-60mVpp with the ATT all position retracted (OFF), a loss of about 1.5-2mVpp
|
Source
|
20dB
|
40dB
|
10dB
|
Reading
|
|
63.2mVpp
|
OFF
|
OFF
|
OFF
|
60mVpp
|
|
?
|
ON
|
OFF
|
OFF
|
6.40mVpp
|
|
?
|
OFF
|
ON
|
OFF
|
1.60mVpp
|
|
?
|
OFF
|
OFF
|
ON
|
19mVpp
|
|
?
|
ON
|
ON
|
OFF
|
0.800 - 1.2mVpp
|
|
?
|
ON
|
ON
|
ON
|
0.800 - 1.2mVpp
|
|
?
|
ON
|
OFF
|
ON
|
2.4-2.8mVpp
|
|
?
|
OFF
|
ON
|
ON
|
.800-1.2mVpp
|
|
Re: 8594E input attenuator issue?
Using the p-p amplitudes shown in the lower left corner of the screen, I calculate 20 dB where you said 40, and 30 dB where you said 50. Are you sure that is a 40 dB section, as that is kind of uncommon in the HP attenuators I’ve seen? They would usually get 40 by turning on two 20’s. Getting 40 dB across one section is asking a lot of the isolation across that section as the frequency goes higher. ?
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From: [email protected] <[email protected]> On Behalf Of Nicolas Mailloux
Sent: Thursday, January 20, 2022 8:51 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?? I enabled FFT on my DSO. (It is a Rigol D1052E hacked to 100Mhz) My TF 2015 is old and the maximum dB out I can get is theoretically -1dB (-7dB on the dials and a +6dB boost on CW Mode) ? First picture shows without any attenuation Second shows the 40dB attenuation Third shows 40dB + 10dB attenuation. ? I will clean contacts and re-measure later. ? ? ? Nicolas,
If your DSO has an FFT function it could help in checking the higher attenuations.
--John Gord
On Wed, Jan 19, 2022 at 08:09 PM, <nicolas.mailloux@...> wrote: Alright, I tried myself with a 3D printed plunger. It's not perfect, I would need to trim a bit on the top because it keeps the blade too low when engaged, but it's doable with time.
The broken plunger is at the capacitor. I booted up my vintage TF2015 Marconi RF generator, set it to 50Mhz and 15Mhz here are the results :
PIN 1 = DC BLOCK
PIN 2 = 20 dB
PIN 3 = 40 dB
PIN 4 = 10 dB
I fed +/- -20dBm to the ATT from the TF 2015. My DSO read +/-63.2mVpp without the ATT and +/-60mVpp with the ATT all position retracted (OFF), a loss of about 1.5-2mVpp Source | 20dB | 40dB | 10dB | Reading | 63.2mVpp | OFF | OFF | OFF | 60mVpp | ? | ON | OFF | OFF | 6.40mVpp | ? | OFF | ON | OFF | 1.60mVpp | ? | OFF | OFF | ON | 19mVpp | ? | ON | ON | OFF | 0.800 - 1.2mVpp | ? | ON | ON | ON | 0.800 - 1.2mVpp | ? | ON | OFF | ON | 2.4-2.8mVpp | ? | OFF | ON | ON | .800-1.2mVpp |
|
Re: E5071C the program can't working
Been known to happen.? You have an ENA, but 5 to 10 years ago I worked with a PNA (lucky me) that developed a pathological cal set.? Even "touching" that cal set crashed the Windows operating system.? That is, so much as clicking on the cal set filename to try to delete it would cause a crash.? Not so lucky!? So we sent it back to Keysight under warranty, who replaced the hard drive.? Problem solved.? ? ? ? ? Jim Ford?
Sent from my T-Mobile 4G LTE Device
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-------- Original message -------- From: n8zmTWH@... Date: 1/19/22 7:12 PM (GMT-08:00) Subject: Re: [HP-Agilent-Keysight-equipment] E5071C the program can't working
Sounds like a corrupted hard drive. ? You might be able to purchase a replacement hard drive from Keysight which would not be too expensive compared to the value of that VNA. It WILL be more than a hard drive costs these days but part of that is the value of the code on it. ? A call to the service center is probably your best bet now. ? Where are you located? ? ? thanks but i did recovery it. now,it can't working
|
Re: 8594E input attenuator issue?
I enabled FFT on my DSO. (It is a Rigol D1052E hacked to 100Mhz)
My TF 2015 is old and the maximum dB out I can get is theoretically -1dB (-7dB on the dials and a +6dB boost on CW Mode)
?
First picture shows without any attenuation
Second shows the 40dB attenuation
Third shows 40dB + 10dB attenuation.
?
I will clean contacts and re-measure later.
?
?
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Show quoted text
From: [email protected] <[email protected]>
On Behalf Of John Gord via groups.io
Sent: 20 janvier 2022 01:37
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] 8594E input attenuator issue?
?
Nicolas,
If your DSO has an FFT function it could help in checking the higher attenuations.
--John Gord
On Wed, Jan 19, 2022 at 08:09 PM, <nicolas.mailloux@...> wrote:
Alright, I tried myself with a 3D printed plunger. It's not perfect, I would need to trim a bit on the top because it keeps the blade too low when engaged, but it's doable with time.
The broken plunger is at the capacitor. I booted up my vintage TF2015 Marconi RF generator, set it to 50Mhz and 15Mhz here are the results :
PIN 1 = DC BLOCK
PIN 2 = 20 dB
PIN 3 = 40 dB
PIN 4 = 10 dB
I fed +/- -20dBm to the ATT from the TF 2015. My DSO read +/-63.2mVpp without the ATT and +/-60mVpp with the ATT all position retracted (OFF), a loss of about 1.5-2mVpp
|
Source
|
20dB
|
40dB
|
10dB
|
Reading
|
|
63.2mVpp
|
OFF
|
OFF
|
OFF
|
60mVpp
|
|
?
|
ON
|
OFF
|
OFF
|
6.40mVpp
|
|
?
|
OFF
|
ON
|
OFF
|
1.60mVpp
|
|
?
|
OFF
|
OFF
|
ON
|
19mVpp
|
|
?
|
ON
|
ON
|
OFF
|
0.800 - 1.2mVpp
|
|
?
|
ON
|
ON
|
ON
|
0.800 - 1.2mVpp
|
|
?
|
ON
|
OFF
|
ON
|
2.4-2.8mVpp
|
|
?
|
OFF
|
ON
|
ON
|
.800-1.2mVpp
|
|
