Re: E4418B power supply schematic?
Hi Razvan,
I don't have a schematic, but mine has an Artesyn NFN40-7608. The datasheet is here.
Is the standby light on, or do you get nothing?
Tom
toggle quoted message
Show quoted text
On 5/30/2022 10:49 AM, Razvan wrote: Hey everyone,
Is there any information out there on the power supply used in these units? Mine appears to have died (I can't measure any output), and I can't find the schematic in the CLIP files.
The full part number of the PSU seems to be JW 1287, JW being the manufacturer.
This isn't the first time it failed. Many years ago a resistor went open, but I don't remember how I troubleshooted that, and I didn't take any notes...
Cheers,
Razvan
|
According to the manual on the Keysight site, 08562-90124 should be a complete set of the 'latest' CLIPs.? The CLIP for A4 2923A prefix should be 08562-90128.? You'd have to ask Dave at Artek whether his copy of '124 includes it as Keysight's manual also says "CLIPs may not be available for recently introduced assemblies". Whether this would help is a different matter as the same manual essentially says A4 is factory only repair.
On Mon, May 30, 2022 at 8:56 AM hardyhansendk via <hardyhansen= [email protected]> wrote:
Hi Richard
Artek have the? 08562-90124 CLIP.
Hardy
?
?
Hi All I'm Looking for a HP service manual for the 8562A but
not the one that seems commonly available (08562-90062 for serial number prefix
2913A) my serial number is 2923A, I'm looking at the log amp detector and the
trouble shooting? seems completely wrong so I suspect there has been
changes, If anyone has prefix 2923A or later or could point me in the right
direction i would be grateful, thanks
|
Hi Richard
Artek have the? 08562-90124 CLIP.
Hardy
?
?
Hi All I'm Looking for a HP service manual for the 8562A but
not the one that seems commonly available (08562-90062 for serial number prefix
2913A) my serial number is 2923A, I'm looking at the log amp detector and the
trouble shooting? seems completely wrong so I suspect there has been
changes, If anyone has prefix 2923A or later or could point me in the right
direction i would be grateful, thanks
|
Hi All I'm Looking for a HP service manual for the 8562A but not the one that seems commonly available (08562-90062 for serial number prefix 2913A) my serial number is 2923A, I'm looking at the log amp detector and the trouble shooting? seems completely wrong so I suspect there has been changes, If anyone has prefix 2923A or later or could point me in the right direction i would be grateful, thanks
|
E4418B power supply schematic?
Hey everyone,
Is there any information out there on the power supply used in these units? Mine appears to have died (I can't measure any output), and I can't find the schematic in the CLIP files.
The full part number of the PSU seems to be JW 1287, JW being the manufacturer.
This isn't the first time it failed. Many years ago a resistor went open, but I don't remember how I troubleshooted that, and I didn't take any notes...
Cheers,
Razvan
|
HP 8662A - alternative attenuator configurations
Hi,
While trying to fix my HP8662A I'm trying to work out if?it is missing an output attenuator relay drive cable - or not.
There appear to be at least two attenuator configurations in these instruments. My machine has two attenuator units, each with a ribbon cable attached - which I assume are the relay drive signals. I have seen pictures of other revs of the instrument with a single larger attenuator with a drive cable that comes from the motherboard, but no ribbon cables. I attach a picture of both configs, as far as I can research them.
I can't find any HP update/change documentation on the internet about when the configuration of the attenuators for this instrument changed - or indeed, if it is an instrument option.
My question regards the attenuator drive cable. In my own instrument with 2 attenuators there is no drive cable plugged in to the motherboard (see circled area in pictures). In the single attenuator model this cable exists (again, see picture). So should my instrument have that cable (i.e. it is missing), or do the ribbon cables carry those signals and therefore does not need one?
I hope that is clear!
Many thanks
Tony
|
Re: HP 8116A woes with E42 error
With the offset is set to -2.00 Vdc, the output of U502 reads -13.240.
1) anode of CR501 = -7.891 Vdc
2) emitter of Q501 = -1.0263 Vdc
3) cathode of CR502 = -9.446 Vdc
4) emitter of Q502 = 1.0324 Vdc
5) top of R511 (node 47) = .0024 Vdc
Thanks,
David
|
Re: HP 8116A woes with E42 error
On Sun, May 29, 2022 at 09:21 PM, Swiss wrote:
...
U501 they call an offset current compensation amplifier, and U502 they call the offset voltage control. I measured the output of both U501 and U502 at different offset output settings, and here are the results,
U501
-7 Vdc = 9.037
-5 Vdc = 9.014
-2 Vdc = 8.990
0 Vdc = 8.749
20 mVdc = -.0906 <-- I included this because of the results I was seeing from U502
1 Vdc = -2.0732
2 Vdc = -3.3286
5 Vdc = -6.935
7 Vdc = -9.305
U502
-7 Vdc = -13.526
-5 Vdc = -13.256
-2 Vdc = -13.252
0 Vdc = -13.252
20 mVdc = -13.123 <-- At approximately 28 mV, the output changes from -13.123 V to -0.7800??
1 Vdc = -.6912
2 Vdc = -.6774
5 Vdc = -.6600
7 Vdc = -.6544
------ When offset is set to one of the settings that produce -13.2V at the output of U502, what voltages do you measure at 1) anode of CR501? 2) emitter of Q501? 3) cathode of CR502 4) emitter of Q502 5) top of R511 (node 47) Ozan
|
Re: HP 8116A woes with E42 error
So I did some more reading and I was wondering what comes after the DAC output control from A2. As mentioned before, I measured the output of the DAC and listed the voltages in my first post. They were slightly out of spec according to the repair manual, but not so much that I was concerned about it. I kept following the trail and ended up at U501 and U502.
U501 they call an offset current compensation amplifier, and U502 they call the offset voltage control. I measured the output of both U501 and U502 at different offset output settings, and here are the results,
U501
-7 Vdc = 9.037
-5 Vdc = 9.014
-2 Vdc = 8.990
0 Vdc = 8.749
20 mVdc = -.0906 <-- I included this because of the results I was seeing from U502
1 Vdc = -2.0732
2 Vdc = -3.3286
5 Vdc = -6.935
7 Vdc = -9.305
U502
-7 Vdc = -13.526
-5 Vdc = -13.256
-2 Vdc = -13.252
0 Vdc = -13.252
20 mVdc = -13.123 <-- At approximately 28 mV, the output changes from -13.123 V to -0.7800??
1 Vdc = -.6912
2 Vdc = -.6774
5 Vdc = -.6600
7 Vdc = -.6544
U502 feeds the inputs of Q501 and Q502. It doesn't look like U502 is working properly to me. All the components surrounding U502 look in good shape and measure fine as well.
I thought about injecting variable DC into the input of R509 to see if I would get a different response, but I decided against that as I didn't want to subject the output of another function generator or the input of the amplifier without breaking the circuit. U502 is an OP-07CP an they are readily available. I ordered a couple. In the mean time, (tomorrow if I am able) I may remove U502 and try injecting a signal into the system to see if it the culprit, or I may open the other unit I have, and compare measurements.?
I'm still not 100% sure if this is the trouble spot, but it looks to be very suspect.
Thanks,
David
|
Re: 53181A 3 GHz prescaler from China
Has anyone measured the additional phase noise from this clock multiplier module, or others?
Thanks, Ron
-
|
Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable
Not sure if this has been mentioned, and it is entirely academic, but the attenuation of the cable could degrade accuracy if the cables have significant enough loss.? However with your cable (RG213), length (100ft) and freq (14MHz) this loss is small. and?will not make a significant difference.
If you pushed the frequency up into the GHz, then it could be significant. Cable loss will eat into the available dynamic range of the return loss calculations, and if there is enough loss then the mathematical precision and instrument stability will start to limit measurement accuracy.
i.e. with enough loss, then the signal reflected back to the VNA by the open/short and the zero reflection for the load will start to look the same.
Cheers, Roger
On Sat, 28 May 2022, 11:50 AM Karin Johnson, < karinann@...> wrote: I realized a couple of hours after sending the initial post, that I was incorrect with associating Calibration with the Port Extensions.
Here is, I hope a better explanation of what I am trying to do.
First off the measurement frequency is 14 MHz.? So not too beyond the capability of the 8753C.
I want to place the measurement plane at the end of a 100 foot length of RG213.? So I place the SOL standards, one at a time at the
end of the cable.? Supposedly the 8753C measurement plane is now at the end of the cable.
Now I can take S11 measurements relative to the measurement plane at the end of the cable.? My question should have been
" Is there a limit in terms of how long a cable can be before this calibration technique fails."
This is probably related to the storage of the cal correction factors in the memory of the 8753C.? Is it via floating point numbers, or integer numbers?
How large or small can the calibration correction values be???
I seem to be able to obtain valid data using this technique, but wanted to ask on the Keysight forum with some of the folks who actually designed
the instrument.? I think Dr. Joel it still active there.?
My rant about not being able to login to the Keysight forums still exists.? It seems their login/validation screen seems broken.
At one time I had an account over there but they have seemed to have changed the supporting vendor for the forum sites.
As always,
Regards,
Karin Johnson
|
Re: Limits of the Port Extension on the Cal screen for calibrating at end of cable
Thanks to all who replied.
I used to design fiber optic systems, among my other system design tasks, and am aware of the fact the receiver cannot sometimes track the source because of long delays in the cable or fiber.? I have slowed the sweep and have not noticed any appreciable discrepancies with the data.? So my conclusion is that using a 30 Meter (my tip of the hat to Dr, Kirkby) cable should enact the calibration, and would not be an issue for the 8753C.? I agree with Tom about only the phase being a factor in the port extensions.? But I am not using port extensions.? I have a piece of software that will allow me to enter data for measurements taken at various points along a fixed length of cable, and can "BACk OUT" the cable to reflect the actual data at the calibration plane.
All of that experimentation with that software and real world measurements seem to correlate correctly.??? This question from the very beginning, excepting my original mistake, was somewhat academic.? I have been using this method for a number of years and it does work.?
I guess recently I've become a bit bored looking for some new project to undertake.
I truly respect the groups knowledge and time putting up with my questions.
Regards,
Karin
|
Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
According to the CLIP the A4 assembly is the Log Amp and Cal assembly. J3,J4,J5,J7 and J8 are 50 Ohm SMB connectors according to the parts list. I have not identified the EXACT designation of the RED SMB coaxial lead in question yet. I'll have a look next weekend.
|
Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
A few comments on SMB connectors :
SMB is a push on RF connector that is a cousin of the SMC connector both are identical except of the SMC being screw on.
SMB was designed as a miniature RF connector for internal wiring , it is normally used with RG174,188 and 316 cables but there are also versions that accommodate 0.086 hardline.
Frequency rating is -4GHz although in testing equipment it¡¯s usually used below 1GHz mostly for IF or sweep signals .
The biggest concern with SMB is that like most push ons they are leaky and tend to develop reliability issues over time as the leaf springs holding the connector in place tend to lose tension.
toggle quoted message
Show quoted text
On May 29, 2022, at 13:23, David via groups.io <david@...> wrote:
?George,
I will confirm if there is a connector on the other end and the exact length this coming weekend. Thank you.
David.
|
Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
What is the signal involved? HP often used SMB for DC bias or things
like RF detector outputs when they just wanted a well screened
cable. If that is the case here then a slightly squidged cable is
not a problem (assuming it still has continuity and isn't shorted of
course!)
On 29/05/2022 18:58, David wrote:
toggle quoted message
Show quoted text
Thank you for your replies so far.
Please find attached a photo of the connectors and the damaged
coax cable (Red). If I was to buy cable it is important to buy the
correct type so that it's the correct impedance and also so that
it fits any connector properly. I hope you can help me further.
Thanks
Attachments:
|
Re: HP 8116A woes with E42 error
I did check the supplies. Sorry I forgot to mention that. If I remember correctly the +15 V supply was off, and it wasn't off by much. It was in the millivolts range if I recall. I was able to get that back into range with no trouble.It didn't catch me off guard as I would expect these to drift out of range slightly over time.
I will double check these values again this evening before I move on to recapping a Monsanto 101A counter. Like this nixie tube counter too. Pretty neato.
Thanks,
David
|
Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
I'll also give the warming up trick a try as well and I'll check the continuity as well. Thanks.
David.
|
Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
George,
I will confirm if there is a connector on the other end and the exact length this coming weekend. Thank you.
David.
|
Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
Hi David
Having looked at the photograph I would first try slightly warming the cable and then using my thumb and a finger try to roll the damage out of the coax.
?
SMB connectors are not normally used in high frequency RF or critical circuits so a little cable damage may not matter.
?
To remove an SMB pull on the sleeve nearest the matting connector as they are a latch fitting.
?
G Edmonds
|
Re: HP8563E-Damaged red coax from A4 PCB-Is it easy to replace?
Hi David
This is an SMB connector.? The cable is almost certainly 50 Ohms impedance as is the SMB connector.
The red is just for identification, does it have connectors on both ends?
What is the length?
G Edmonds
|
Richard
