Re: HP-8753E Option Key Installation Failure
Digital oscilloscope, storage oscilloscope, peak reading
voltmeter, regular oscilloscope in a dim room.?
You're measuring the voltages (right now) as static voltages??
That may not be helpful.
PLCC chips are rare, and professionally (non Chinese), the reader
plugins may be a bit nasty in price.
Adaptors can be made if you have the right socket.? Sockets may not
be hard to come by.? There's a company that makes PC boards for
adapting various types of chips, they may have something that could
help.? (Don't remember the name).
Logic analyzer *could* help a bit.
If you can isolate the driver for the chip by unplugging things,
then you can manually drive the data driver to the chip.? Since
it's a data line by nomenclature (DQx), it may be either the
processor unbuffered, or this might be the processor buffered.? If
the buffer lines run to other chips, then if they work, the driver
is likely good.? Shorts on the data lines may not be fatal.?
Looking at this with a scope, especially if in a repetitive loop,
could be very helpful, if you can generate that.
If the equipment has a provision for signature analysis, then
that puts the processor in a cyclical read of all addresses, which
should force a read of the EEPROM's address space, which you can
trigger a scope on, and get an idea.
So possibly options.....
Harvey
On 2/12/2022 1:07 PM, Rich Miller via
groups.io wrote:
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Show quoted text
Hi Harvey:
I have no way to check the voltages while writing to it (at
least not reasonably). I think its time to invest in a EEPROM
writer/reader for PLCC.
Rich
On Feb 12, 2022, at 12:49 PM, Harvey
White <madyn@...> wrote:
?
If you can remove the eeprom, and then check the voltages
when writing, that might tell you if the driver for DQ6 is
damaged.? If you could read the EEPROM in another setting
(PLCC adaptors are rare), then that would tell you if the
chip were good.
Harvey
On 2/12/2022 12:44 PM, Rich
Miller via groups.io wrote:
Hello All:
Today, I took another look at the issue, and made an
interesting discovery. The AM29F010-70JC EEPROM Pin 20
(DQ6 line) was damaged while installing the PLCC package
into the socket. I straightened it out, and reinserted
it. It is now making contact, but I am not sure if the
pin moved over to the adjacent Pin 19 (DQ5). Right now,
when I measure the voltage at Pin 20 its at 2.5V, and
when I attempt to write the bit to invoke the options it
drops to about 1.75V. I am still getting the Failure
when attempting to load the options.
So its clear someone has been in here before. I now
worry that I might not be able to recover anything from
it. I certainly do not think it can be written to any
longer. Would anyone by chance have a replacement RevD??
Rich
On Feb 12, 2022, at 5:53 AM,
Harke Smits via groups.io <yrrah@...>
wrote:
?
Rich,
There is nothing wrong with just reading the
contents of the EEPROM. Then store the original
safely and program another one for a test. I’ve
done that a couple of time for spectrum analyers.
Works great, can do no harm.?
Good luck,
Harke
(Send from my iPad4)
Op 12 feb. 2022 om 10:41
heeft Rich Miller via groups.io <av8torrich@...>
het volgende geschreven:
?
Leon:
That is good information. In a little
while, I am going to test my S400 Jumper to
make sure when I toggle #8 on the dip
switch, I am getting continuity.?
The idea of having to pull the EEPROM and
write to it does not sit well with me. I
worry I may render the analyzer inoperative
if I accidentally corrupt the files held
within it. Anything I can do to avoid I will
try.
Rich
?Hi Rich,
I've done an option upgrade 14 days
ago on my 8753D (with the CPU 000
board, which is probably also in your
VNA). I've got the same error, because
I did not flip the jumper (there is no
A9 dip swich on the CPU 000 board, but
is the S400 instead). After I've
correctly flipped the S400 #8 switch,
the option upgrade went flawlessly.
Greetings,
Leon
|
Re: [HP-Agilent-KI eysight-equipment] FM Tuner alignment generator?..
Panasonic and Meguro make?some great units. I have a Panasonic - which in some communities?is kind of a standard for this - and I hate to do this, but if people would know how good these are at aligning?modern tuners they'd go for much higher prices than relatively famous?units such as an ST1000A or other older units. These Panasonic units are very accurate, rugged, modern, and have a very comprehensive set of features for this work. Furthemore, they allow you to align the very best tuners to well beyond what an older unit would allow you to.?
I am not aware of HP units that can be as good at this specific work as some of the Panasonic models I know. The Panasonic, Meguro, and some of the other makes mentioned cater very specifically and with the right set of features to the FM tuner techs. I don't think you should be focusing?on HP for this duty. I am a hardcore fan of HP instrumentation and I use a Panasonic for this work. There may be HP units I am not aware of, but once I got this, I never looked back.?
The other units I typically employ for this are an Audio Precision system with a Lynx interface that allows for very accurate and live distortion readings through ARTA (these two constitute my standard equipment for all my audio work). Using both THD and FFT on a tuner can give a plethora of information about the optimal adjustment for a given alignment step. A lot of that information would be inaccessible without this equipment.?
With the combination?above, with some of the best tuners, adjustments to well beyond 0.03% are possible.?
|
Re: HP-8753E Option Key Installation Failure
Hi Harvey:
I have no way to check the voltages while writing to it (at least not reasonably). I think its time to invest in a EEPROM writer/reader for PLCC. Rich
toggle quoted message
Show quoted text
On Feb 12, 2022, at 12:49 PM, Harvey White <madyn@...> wrote:
?
If you can remove the eeprom, and then check the voltages when
writing, that might tell you if the driver for DQ6 is damaged.? If
you could read the EEPROM in another setting (PLCC adaptors are
rare), then that would tell you if the chip were good.
Harvey
On 2/12/2022 12:44 PM, Rich Miller via
groups.io wrote:
Hello All:
Today, I took another look at the issue, and made an
interesting discovery. The AM29F010-70JC EEPROM Pin 20 (DQ6
line) was damaged while installing the PLCC package into the
socket. I straightened it out, and reinserted it. It is now
making contact, but I am not sure if the pin moved over to the
adjacent Pin 19 (DQ5). Right now, when I measure the voltage at
Pin 20 its at 2.5V, and when I attempt to write the bit to
invoke the options it drops to about 1.75V. I am still getting
the Failure when attempting to load the options.
So its clear someone has been in here before. I now worry
that I might not be able to recover anything from it. I
certainly do not think it can be written to any longer. Would
anyone by chance have a replacement RevD??
Rich
On Feb 12, 2022, at 5:53 AM, Harke
Smits via groups.io <yrrah@...>
wrote:
?
Rich,
There is nothing wrong with just reading the contents
of the EEPROM. Then store the original safely and program
another one for a test. I’ve done that a couple of time
for spectrum analyers. Works great, can do no harm.?
Good luck,
Harke
(Send from my iPad4)
Op 12 feb. 2022 om 10:41 heeft
Rich Miller via groups.io
<av8torrich@...> het volgende
geschreven:
?
Leon:
That is good information. In a little while, I am
going to test my S400 Jumper to make sure when I
toggle #8 on the dip switch, I am getting
continuity.?
The idea of having to pull the EEPROM and write
to it does not sit well with me. I worry I may
render the analyzer inoperative if I accidentally
corrupt the files held within it. Anything I can do
to avoid I will try.
Rich
?Hi Rich,
I've done an option upgrade 14 days ago on my
8753D (with the CPU 000 board, which is
probably also in your VNA). I've got the same
error, because I did not flip the jumper
(there is no A9 dip swich on the CPU 000
board, but is the S400 instead). After I've
correctly flipped the S400 #8 switch, the
option upgrade went flawlessly.
Greetings,
Leon
|
Re: HP-8753E Option Key Installation Failure
If you can remove the eeprom, and then check the voltages when
writing, that might tell you if the driver for DQ6 is damaged.? If
you could read the EEPROM in another setting (PLCC adaptors are
rare), then that would tell you if the chip were good.
Harvey
On 2/12/2022 12:44 PM, Rich Miller via
groups.io wrote:
toggle quoted message
Show quoted text
Hello All:
Today, I took another look at the issue, and made an
interesting discovery. The AM29F010-70JC EEPROM Pin 20 (DQ6
line) was damaged while installing the PLCC package into the
socket. I straightened it out, and reinserted it. It is now
making contact, but I am not sure if the pin moved over to the
adjacent Pin 19 (DQ5). Right now, when I measure the voltage at
Pin 20 its at 2.5V, and when I attempt to write the bit to
invoke the options it drops to about 1.75V. I am still getting
the Failure when attempting to load the options.
So its clear someone has been in here before. I now worry
that I might not be able to recover anything from it. I
certainly do not think it can be written to any longer. Would
anyone by chance have a replacement RevD??
Rich
On Feb 12, 2022, at 5:53 AM, Harke
Smits via groups.io <yrrah@...>
wrote:
?
Rich,
There is nothing wrong with just reading the contents
of the EEPROM. Then store the original safely and program
another one for a test. I’ve done that a couple of time
for spectrum analyers. Works great, can do no harm.?
Good luck,
Harke
(Send from my iPad4)
Op 12 feb. 2022 om 10:41 heeft
Rich Miller via groups.io
<av8torrich@...> het volgende
geschreven:
?
Leon:
That is good information. In a little while, I am
going to test my S400 Jumper to make sure when I
toggle #8 on the dip switch, I am getting
continuity.?
The idea of having to pull the EEPROM and write
to it does not sit well with me. I worry I may
render the analyzer inoperative if I accidentally
corrupt the files held within it. Anything I can do
to avoid I will try.
Rich
?Hi Rich,
I've done an option upgrade 14 days ago on my
8753D (with the CPU 000 board, which is
probably also in your VNA). I've got the same
error, because I did not flip the jumper
(there is no A9 dip swich on the CPU 000
board, but is the S400 instead). After I've
correctly flipped the S400 #8 switch, the
option upgrade went flawlessly.
Greetings,
Leon
|
Re: HP-8753E Option Key Installation Failure
Hello All:
Today, I took another look at the issue, and made an interesting discovery. The AM29F010-70JC EEPROM Pin 20 (DQ6 line) was damaged while installing the PLCC package into the socket. I straightened it out, and reinserted it. It is now making contact, but I am not sure if the pin moved over to the adjacent Pin 19 (DQ5). Right now, when I measure the voltage at Pin 20 its at 2.5V, and when I attempt to write the bit to invoke the options it drops to about 1.75V. I am still getting the Failure when attempting to load the options.
So its clear someone has been in here before. I now worry that I might not be able to recover anything from it. I certainly do not think it can be written to any longer. Would anyone by chance have a replacement RevD??
Rich
toggle quoted message
Show quoted text
On Feb 12, 2022, at 5:53 AM, Harke Smits via groups.io <yrrah@...> wrote:
? Rich,
There is nothing wrong with just reading the contents of the EEPROM. Then store the original safely and program another one for a test. I’ve done that a couple of time for spectrum analyers. Works great, can do no harm.? Good luck, Harke
(Send from my iPad4) Op 12 feb. 2022 om 10:41 heeft Rich Miller via groups.io <av8torrich@...> het volgende geschreven:
? Leon:
That is good information. In a little while, I am going to test my S400 Jumper to make sure when I toggle #8 on the dip switch, I am getting continuity.?
The idea of having to pull the EEPROM and write to it does not sit well with me. I worry I may render the analyzer inoperative if I accidentally corrupt the files held within it. Anything I can do to avoid I will try.
Rich On Feb 12, 2022, at 4:10 AM, LeonP <leon.pavlovic@...> wrote:
?Hi Rich,
I've done an option upgrade 14 days ago on my 8753D (with the CPU 000 board, which is probably also in your VNA). I've got the same error, because I did not flip the jumper (there is no A9 dip swich on the CPU 000 board, but is the S400 instead). After I've correctly flipped the S400 #8 switch, the option upgrade went flawlessly.
Greetings,
Leon
|
Re: 11710B Down converter
Futurlec has 2N2218 in stock.? The ubiquitous 2N2219 is the same part, just higher hfe.? HP knew about the 2N2219 so maybe they had trouble with instability.? You could probably select for low hfe.
?
2N2222 is the same as 2N2219 except smaller package and consequent lower power dissipation.
The -A parts are the same except higher breakdown voltage.? Digikey and Mouser have 2N2218A and 2N2221A in stock right now, and of course everybody has 2N2222A or PN2222A.
?
A quick skim of the A1 board schematic doesn’t worry me about either breakdown voltage or power dissipation.
?
Dave Wise
?
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From: [email protected] < [email protected]>
On Behalf Of Willie via groups.io
Sent: Friday, February 11, 2022 5:10 PM
To: [email protected]
Subject: [HP-Agilent-Keysight-equipment] 11710B Down converter
?
My down converter is something i use a lot with my 8640B sig gen when I? need a signal below 450 KHZ.? Unfortunately a clumsy accident killed the output.? The failure was traced to Q1 and Q2 on the converter
amplifier assembly board.? Q2 is listed as a 2N2218A and Q1 is an in-house part number.? I used a 2n2222 for Q1 and that worked fine.? After repairs the difference between direct and down converted output was less? than 1 db.? This repair may seem mundane
but the reason I mention all this is that the 2N2218A is not listed in Mouser and although DigiKey shows stock it is listed as obsolete.? I bought a few for insurance against future mishaps.? If you have this down converter you might want to the same.
Bill, K3PGB
|
HP8753C won't phase lock below 16MHz with A9 CC jumper in 'NORM'
I'm trying to recucitate an HP8753C. I replaced the YTO which was bad and was able to do the 'Source Pretune Correction Constants' adjustments procedure. This is done with the A9 jumper in the 'ALTER' (right most) position. After adjustment the jumper is returned to the 'NORM' (let most) position. When I do this I do not get phase lock below 16 MHz (low band). The High/Low Band Transition Adustment shows normal (right hand trace ~150mv highr than left). ?Do anyone have a clue as to what might be wrong?? Why would the jumper position effect the performance of the PLL?  With jumper in 'NORM' (.3 to 20MHz)  Jumper in 'ALTER' (0.3 to 20MHz)
|
Re: Help E4402B 1DR Option not working
Dave, THANK YOU!!!! ? It worked!!!!!!! ? Best, Francesco K5URG ? ? ?
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From: [email protected] < [email protected]> On Behalf Of Dave Ireland Sent: Saturday, February 12, 2022 1:01 AM To: [email protected]Subject: Re: [HP-Agilent-Keysight-equipment] Help E4402B 1DR Option not working ? Funny you should raise this as I was just yesterday trying to get my E4401 with the same option to less than 1KHz to try and have a look at the spectral purity of a 8640B.? It would not go below 1KHz whatever I did. According to one of the Agilent guides it casually said under System hit the system defaults. It didn't seem to impact anything but now it goes down to 1Hz. -------- Original message -------- From: "Francesco Ledda via groups.io" <k5urg@...> Date: 12/2/22 09:03 (GMT+08:00) Subject: [HP-Agilent-Keysight-equipment] Help E4402B 1DR Option not working I have an E4402B that shows options 1DR installed, but it doesn't seem to work as no BW smaller than 1 kHz can be selected. See picture.
What can I do to address this issue?
Thank you and Best, Francesco K5URG
|
HP 8595E Restore and Tracking Generator Questions
Just want to start out by saying I have no background in EE but I am a ham who has restored an older tube radio (SB-101) as well as two Tektronix 24XX scopes (recapping both was the ultimate fix for the scopes).? Somewhere along the way of fixing the Tek scopes I got bit by the test equipment bug and thus began my search for an older SA that I could work on.? I seem to really have developed a liking to this vintage 80’s test gear; the main reason is that they all seem to be well documented, still have a following, and I can actually sorta work on them.? Plus, it’s also nice knowing that I’ve saved a bit of history when getting some of this older test gear and getting it back to working.
?
I was lucky enough to come across an 8595E (which is wwaayy more than I need for ham radio use) but couldn’t pass up on the price.? It was sold as parts and when I got it home to the house I was really surprised when I fired it up and it came to life.? First thing I did was copy down the calibration constants for timebase, flatness, and attenuation as I do not have the equipment to calibrate this guy (at least not yet - ?).? Ran through the cal freq and cal amp and it completed successfully so I ran the cal YTF and it successfully completed.? From what I read 300MHz at -20 dBm should mean that it’s calibrated where it needs to be and that’s what I was seeing? so I hooked it up to my cheapo sig gen and played around a bit and it all looked good to me.? Overall I am really happy that I ended up with this piece of test gear.?
?
Now for the first issue – the next day when I went to power it on nothing would happen.? I fiddled with the power button and found that if I pressed it and kept it pressed I could get it to come on but once I released the button it would turn off.? Pressed it a few more times and got it to come on without me holding it.? So did some searching and reading and I guess I am looking at possibly a power switch or some bad caps in the PSU.? Since the only power button I can find is attached to a front face plate, and they want more for that then I paid for the SA, I’m going to start with a recap of the PSU.? Couple of question on that subject –
?
1. Are there any recommended caps types for this scope?? With the Tek scopes I was basically told use the best you can find (not an easy task this day and age) and as long as they are not the cheap Chinese caps you should be fine, as even general purpose caps you can get today are spec’ed way better than what come in it from the 80’s.? Just want to confirm that’s the case here as well.
?
2. Are there any recommended parts to replace while I am in there working on the PSU?? On the Tek scopes there were some recommended resistors to replace while doing the recap.? I have not ran across anything specific in the searches I have done for the HP859X.
?
3. I figure I will replace the battery and supercap while I am in there.? I was just going to pull the battery out and re-enter the constants.? Did I capture everything I need with the timebase, flatness, and attenuation numbers or are there some others I should get while I still can???
?
4. Any thing to watch out for or be mindful of?? Things that break when taking apart or putting back together?
?
Now that those questions are out of the way I wanted to ask about the practicality of getting the parts and adding a tracking generator to this guy as it did not come with one?? I’ve done a little reading and watched a video of one being added.? From what I could tell the SA will recognize it without any type of firmware update and the main parts are –
?
1. The tracking gen itself (5086-7917)
2. Step Attenuator (0955-0679)
3. Control board (5063-0635)
4. LODA (5086-7744)
?
As most of the parts can be found the main problem I see, aside from the price, is that they normally do not come with the hard lines or cables to connect them.? So, I am going to preface this by saying I am using this for ham radio use, and as of right now I highly doubt I will ever be using this to test device in the GHZ range, so, can SMA soft line cables be fabricated and work OK or is there too much stray RF in the device for that to work?? If so what is recommended cable type?
?
So the other option that I have seen regarding added TG functionality, and it’s definitely the cheaper option, is to fabricate a LO out and then use an external generator and passive mixer – which is what I did for my TinySA (definitely wasn’t a perfect solution but it works).? Are any additional HP parts need to get the tap for the LO out are is it as simple as tee’ing it off and running the line to an external port?? If so where is it recommended to tee into?
?
I know I’ll have more question and just want to say ‘Thank you’ in advance to anyone who responds.
- Chad
K5EQ
|
Re: HP 54645A internal battery
I was correct. ?There is no standalone battery in this scope. ?They are simply referring to the battery in the NVRAM module. ?This must have been a condition of the Navy contract to put that sticker on the scope.
Manuel
|
The command is "BPEK". It takes two arguments: address and length (in decimal if I remember correctly), and returns raw bytes prepended with a short ascii header. There's a limit to the length that can be returned in one query, so you'll need to script it to dump the whole thing. I've attached a python script I've used for it as an example.
Do you have the list of gpib to dump? the FW? ? i can try this
|
Do you have the list of gpib to dump? the FW? ? i can try this
|
Re: HP-8753E Option Key Installation Failure
Rich,
There is nothing wrong with just reading the contents of the EEPROM. Then store the original safely and program another one for a test. I’ve done that a couple of time for spectrum analyers. Works great, can do no harm.? Good luck, Harke
(Send from my iPad4)
toggle quoted message
Show quoted text
Op 12 feb. 2022 om 10:41 heeft Rich Miller via groups.io <av8torrich@...> het volgende geschreven:
? Leon:
That is good information. In a little while, I am going to test my S400 Jumper to make sure when I toggle #8 on the dip switch, I am getting continuity.?
The idea of having to pull the EEPROM and write to it does not sit well with me. I worry I may render the analyzer inoperative if I accidentally corrupt the files held within it. Anything I can do to avoid I will try.
Rich On Feb 12, 2022, at 4:10 AM, LeonP <leon.pavlovic@...> wrote:
?Hi Rich,
I've done an option upgrade 14 days ago on my 8753D (with the CPU 000 board, which is probably also in your VNA). I've got the same error, because I did not flip the jumper (there is no A9 dip swich on the CPU 000 board, but is the S400 instead). After I've correctly flipped the S400 #8 switch, the option upgrade went flawlessly.
Greetings,
Leon
|
Re: HP-8753E Option Key Installation Failure
Leon:
That is good information. In a little while, I am going to test my S400 Jumper to make sure when I toggle #8 on the dip switch, I am getting continuity.?
The idea of having to pull the EEPROM and write to it does not sit well with me. I worry I may render the analyzer inoperative if I accidentally corrupt the files held within it. Anything I can do to avoid I will try.
toggle quoted message
Show quoted text
On Feb 12, 2022, at 4:10 AM, LeonP <leon.pavlovic@...> wrote:
?Hi Rich,
I've done an option upgrade 14 days ago on my 8753D (with the CPU 000 board, which is probably also in your VNA). I've got the same error, because I did not flip the jumper (there is no A9 dip swich on the CPU 000 board, but is the S400 instead). After I've correctly flipped the S400 #8 switch, the option upgrade went flawlessly.
Greetings,
Leon
|
Re: HP-8753E Option Key Installation Failure
Hi Rich,
I've done an option upgrade 14 days ago on my 8753D (with the CPU 000 board, which is probably also in your VNA). I've got the same error, because I did not flip the jumper (there is no A9 dip swich on the CPU 000 board, but is the S400 instead). After I've correctly flipped the S400 #8 switch, the option upgrade went flawlessly.
Greetings,
Leon
|
Re: Help E4402B 1DR Option not working
Funny you should raise this as I was just yesterday trying to get my E4401 with the same option to less than 1KHz to try and have a look at the spectral purity of a 8640B.?
It would not go below 1KHz whatever I did. According to one of the Agilent guides it casually said under System hit the system defaults. It didn't seem to impact anything but now it goes down to 1Hz.
Dave
toggle quoted message
Show quoted text
-------- Original message -------- From: "Francesco Ledda via groups.io" <k5urg@...> Date: 12/2/22 09:03 (GMT+08:00) Subject: [HP-Agilent-Keysight-equipment] Help E4402B 1DR Option not working
I have an E4402B that shows options 1DR installed, but it doesn't seem to work as no BW smaller than 1 kHz can be selected. See picture. What can I do to address this issue? Thank you and Best, Francesco K5URG
|
Re: Help E4402B 1DR Option not working
Hi
Contact me off group.
Hardy
?
?
I have an E4402B that shows options 1DR installed, but it
doesn't seem to work as no BW smaller than 1 kHz can be selected. See picture.
What can I do to address this issue?
Thank you and Best, Francesco K5URG
|
Re: Help E4402B 1DR Option not working
Have you checked this?
Maybe you need to update the firmware or something?
You could try removing the license (be sure to carefully write it down first!!!) then enable it again. A bit risky tho.
Mark
|
Re: HP-8753E Option Key Installation Failure
Hi Andrew:
Yes, I am not sure what is going on. I was told this usually is a pretty straight forward process. The analyzer is not failing any of the self test. I think tomorrow I am going to measure continuity across Jumper 8 on the switch to eliminate that possibility.?
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On Feb 11, 2022, at 8:06 PM, Andrew Hakman <andrew.hakman@...> wrote:
? If the serial numbers match, and you still get the fail message, I wonder if that indicates there's actually a hardware problem with your analyser and it can't complete the self-cal properly. These units are notorious for having the source module go bad.
I just remembered when I was adding the time domain option to mine that the switches had to be in the right position to have the eeprom be writable, but I had no issues other than that. I also have been busy with too many other things, and don't have very many "power on hours" on mine since just shortly after I got it.
I'm sure someone here that knows more will chime in - there is at least one person that was involved with the development of the 8753 at HP that's on this list...
Andrew
On Fri, Feb 11, 2022 at 2:51 PM Rich Miller via <av8torrich= [email protected]> wrote: Hi Andrew:
This is the procedure I used:?
It looks to be identical to what you and anther poster has given me within your response. Where I get the error is on Step 8 on Page 8. I keep getting “56 Option Cor FAIL” Rich ? From the service manual on page 3-5?? A9 Switch Positions? 1. Remove the power line cord from the analyzer.? 2. Set the analyzer on its side.? 3. Remove the two lower-rear comer bumpers from the bottom of the
instrument with the T-10 TORX screwdriver.? 4. Loosen the captive screw on the bottom cover’s back edge, using a T-15
TORX screwdriver.? 5. Slide the cover toward the rear of the instrument.? 6. Move the switch as shown in Figure 3-l:
w Move the A9 switch to the Alter position before you run any of the
correction constant adjustment routines. This is the position for altering
the analyzer’s correction constants.
w Move the A9 switch to the Normal position, after you have run correction
constant adjustment routines. This is the position for normal operating
conditions.?
Andrew On Fri, Feb 11, 2022 at 1:18 PM Andrew Hakman via <andrew.hakman= [email protected]> wrote: I believe there's a jumper or a dip switch that has to be set correctly to allow the eeprom to be written. The instructions are in the service manual.?
On Fri, Feb 11, 2022 at 12:06 PM Rich Miller via <av8torrich= [email protected]> wrote: All:
I posted about this over at the EEVBLOG, but I figured I should post it here too. I am having a problem loading the Harmonic and Time Domain Options (OPT2 & OPT10) for my HP-8753E. I have a License Key for my VNA’s serial number, and the instrument posts the matching serial number as to what is printed on the instrument’s physical label on the back.
When I follow the installation process I keep getting the “OPT COR FAIL”. Some of the helpful folks on the EEVBLOG suggest that I may have to remove the EEPROM and force those bits in order to activate. While I am willing to do this, it does pose a degree of risk of corrupting my only EEPROM, not to mention I would have to invest in a Reader/Writer with that would accept this EEPROM package.
Before I take on this risk, I want to make sure there is nothing further I should try.
Rich
|
Re: 11710B Down converter
you may be able to cross it over to a PN2218A.?? Some 2N numbers
in a T0 style can cross over to an epoxy package by replacing the
2N with a PN.
Harvey
On 2/11/2022 8:10 PM, Willie via
groups.io wrote:
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My down converter is something i use a lot with my 8640B sig gen
when I? need a signal below 450 KHZ.? Unfortunately a clumsy
accident killed the output.? The failure was traced to Q1 and Q2
on the converter amplifier assembly board.? Q2 is listed as a
2N2218A and Q1 is an in-house part number.? I used a 2n2222 for Q1
and that worked fine.? After repairs the difference between direct
and down converted output was less? than 1 db.? This repair may
seem mundane but the reason I mention all this is that the 2N2218A
is not listed in Mouser and although DigiKey shows stock it is
listed as obsolete.? I bought a few for insurance against future
mishaps.? If you have this down converter you might want to the
same.
Bill, K3PGB
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