Burke, I have not, my I was hoping to gather some insight
before I grabbed a screwdriver.? Your
thoughts make sense though, I will look into that and post my? results.?
?
Gedas, regarding 'Auto Scale'? I see the 'noise' however it's configured,
auto or manually configured, I see it at 50khz or 500mhz, it always appears and looks the
same.
?
This is my first 'Digital' and it's been a learning
curve, but a lot of fun too, so automatic and math functions~!~
?
Thanks again guys for your time~!~
~Michael - AF7U
?
|
On 02/06/2016 01:36 PM, Doug
dmcgarrett@... [hp_agilent_equipment] wrote:
???
???
Greetings,???
I recently found an 54542C and the previous
owner stated it was stuck in diagnostic mode or had
boot issues. ???I placed it on the bench and it fired
up right away. ???I'm not sure how competent he was in
this model so I can't be sure there was an actual
issue with booting. ???However upon closer examination
there is an issue, not with booting but with the
display. ???Everything
seems fine except stability of the trace, when I
feed a sine wave in, at any frequency, it just isn't
stable. ???I'm not sure how else to describe it, but
slightly jittery. ???This instability shows up in
measurements of frequency, and voltages also which
makes it pretty much unusable. ???It's not a huge
jitter but enough to throw off measurements. I'm
thinking it might be in triggering rather then a
vertical issue but not sure. ???I could up load a
video if anyone has questions or ideas. ???I would
sure like anyone's thinking on this~!~
Thanks in advance,
~Michael - AF7U
I'd first look at the power supply. Maybe poor filtering due
to a defective capacitor. Ideal way to look would be with
another scope!
--doug
Another thought on the power supply: If you don't have another scope
to look at it, find a big capacitor with a large enough voltage
rating, and put it across the supply output and see if
it solves the problem, or at least helps. If so, you know what to do
next. As to the size of the capacitor: for low voltage DC (like a
transistor supply) 1000???F would be a good start. For a
supply in the hundres of volts, maybe 20 ???F.??? Watch that you get the
polarity right!
--doug
|
???
Greetings,???
I recently found an 54542C and the previous owner
stated it was stuck in diagnostic mode or had boot
issues. ???I placed it on the bench and it fired up right
away. ???I'm not sure how competent he was in this model
so I can't be sure there was an actual issue with
booting. ???However upon closer examination there is an
issue, not with booting but with the display. ???Everything seems fine except
stability of the trace, when I feed a sine wave in, at
any frequency, it just isn't stable. ???I'm not sure how
else to describe it, but slightly jittery. ???This
instability shows up in measurements of frequency, and
voltages also which makes it pretty much unusable. ???It's
not a huge jitter but enough to throw off measurements.
I'm thinking it might be in triggering rather then a
vertical issue but not sure. ???I could up load a video if
anyone has questions or ideas. ???I would sure like
anyone's thinking on this~!~
Thanks in advance,
~Michael - AF7U
I'd first look at the power supply. Maybe poor filtering due to a
defective capacitor. Ideal way to look would be with another scope!
--doug
|
Do you see the same effect if you go directly
into the Auto Scale function with the sine wave signal?
I have seen cases of instability when manually configuring the
timebase, triggering, etc and yet with the Auto Scale the signal
locked right in.? Cannot explain it but I have seen it, and on
more than one HP 54xxx scope model.
Gedas, W8BYA
Gallery at
Light travels faster than sound....
This is why some people appear bright until you hear them speak.
toggle quoted message
Show quoted text
?
Greetings,?
I recently found an 54542C and the previous owner
stated it was stuck in diagnostic mode or had boot
issues. ?I placed it on the bench and it fired up right
away. ?I'm not sure how competent he was in this model
so I can't be sure there was an actual issue with
booting. ?However upon closer examination there is an
issue, not with booting but with the display. ?Everything seems fine except
stability of the trace, when I feed a sine wave in, at
any frequency, it just isn't stable. ?I'm not sure how
else to describe it, but slightly jittery. ?This
instability shows up in measurements of frequency, and
voltages also which makes it pretty much unusable. ?It's
not a huge jitter but enough to throw off measurements.
I'm thinking it might be in triggering rather then a
vertical issue but not sure. ?I could up load a video if
anyone has questions or ideas. ?I would sure like
anyone's thinking on this~!~
Thanks in advance,
~Michael - AF7U
|
After a few years, I'm having a "Spring Clear Out" of my Workshop.? Before I put them on eBay, I thought I would see if anyone in the Group is interested first.
There are 25 items, mostly HP test equipment.? Details are on my website at ??on the For Sale page.
I'm based in East Sussex UK for collections or happy to ship World-wide (well nearly!).? Any questions, please let me know off list, or via my website.
Thanks Steve
|
Have you checked the power supplies and ripple?
toggle quoted message
Show quoted text
On 2016-Feb-06 1:55 AM, michael.rosanbalm@... [hp_agilent_equipment] wrote:
Greetings,
I recently found an 54542C and the previous owner stated it was stuck in diagnostic mode or had boot issues. I placed it on the bench and it fired up right away. I'm not sure how competent he was in this model so I can't be sure there was an actual issue with booting. However upon closer examination there is an issue, not with booting but with the display. Everything seems fine except stability of the trace, when I feed a sine wave in, at any frequency, it just isn't stable. I'm not sure how else to describe it, but slightly jittery. This instability shows up in measurements of frequency, and voltages also which makes it pretty much unusable. It's not a huge jitter but enough to throw off measurements. I'm thinking it might be in triggering rather then a vertical issue but not sure. I could up load a video if anyone has questions or ideas. I would sure like anyone's thinking on this~!~
Thanks in advance,
~Michael - AF7U
|
Greetings,? I recently found an 54542C and the previous owner stated it was stuck in diagnostic mode or had boot issues. ?I placed it on the bench and it fired up right away. ?I'm not sure how competent he was in this model so I can't be sure there was an actual issue with booting. ?However upon closer examination there is an issue, not with booting but with the display. ?Everything seems fine except stability of the trace, when I feed a sine wave in, at any frequency, it just isn't stable. ?I'm not sure how else to describe it, but slightly jittery. ?This instability shows up in measurements of frequency, and voltages also which makes it pretty much unusable. ?It's not a huge jitter but enough to throw off measurements. I'm thinking it might be in triggering rather then a vertical issue but not sure. ?I could up load a video if anyone has questions or ideas. ?I would sure like anyone's thinking on this~!~
Thanks in advance, ~Michael - AF7U
|
Hey! ? Open message ? raymond.lafargue@...
|
New file uploaded to hp_agilent_equipment
Hello,
This email message is a notification to let you know that
a file has been uploaded to the Files area of the hp_agilent_equipment
group.
File : /HP859X Calibration Constants/HP859X_Correction_Constants.xls
Uploaded by : sreaves22655 <sam.reaves@...>
Description : An Excel file for recording the calibration constants before you change the battery!
You can access this file at the URL:
To learn more about file sharing for your group, please visit:
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sreaves22655 <sam.reaves@...>
|
Re: HP 8593E attenuator repair...
Hello,
Friday, February 5, 2016, 5:21:07, pianovt at yahoo dot com wrote:
|
?
Yes, there is a very good chance that it is the same pad, but I can't guarantee it. At one time, the 4 GHz attenuators were the same as the higher frequency models except that they were not tested above 4 GHz. Some 4GHz attenuators may have been 22 GHz units that didn't perform quite as well above 4 GHz, so they ended up as 4 GHz units.
__ |
Purchased that 33321-60045, opened it up... And found three pads, one is looking exactly the same as blown 10 dB pad in 33321-60039 from 8593E, another one is like three remaining 20 dB pads in 8593E attenuator, and one wide pad, probably 40 dB one.
10 dB pad was carefully moved to 8593E attenuator, and instrument passed self-calibration without any errors. Not yet tested it at a frequencies over 1.5 GHz, but at least to 1,5 GHz everyting is within specs.
--
Best regards,
Yuri ? ? ? ? ? ? ? ? ? ? ? ? ?mailto:yuri@...
|
The 3325 is much more capable than the 3324. I can't think of any advantage that the 3324 has over the 3325 other than it looks more modern.. Originally the advanage was lower purchase cost.
Robert G8RPI.
|
Re: HP 8563E spectrum analyser help needed
Hello Chris,
I am having 8563E with only the vertical line on display. I suspect it to be the X-POS video circuitry after the Line generator DACs, however I am unable to troubleshoot further.?
Could you be able to share the A2 controller schematic?
kailashkhairnar@... kailashkhairnar@...
Regards, Kailash Khairnar
|
Re: HP8593A Power Supply repair
Hi all,
Update:
Symptom: No display in HP8593A with low supply rail (+5V) after initial power up. I tested the power supply on bench with 2.5A load on +5V, 0.8A each on +/- 15V. The power supply was up and running fine. Short Pin 19 with 17 to bring on PS. There was no fault in any of the electrolytics.
So prepared Power supply extension cable (1 mtr length) ?for the 37 pin D-connector as it was not feasible to test the voltages on pins. And voila!! the spectrum was up and running. I switched it off and on several times to confirm the power supply was not in fault.
The HPWRUP signal from power supply(Pin 37) to Controller board feeds 74HC14 gate and o/p is again inverted by 2-i/p distinct nand gates to obtain LRST and LHLT signals to the processor. When the CPU is halted the current drawn falls below the PS required threshold and hence the PS stops regulating.
1. It was the Power supply unit connector fault and several attempts were made to onstall the P/S but the result was not consistent sometimes the SA would come ON and some times not. There was loose connection in the mating 37-pin D-connectors. The D-connector on the P/S unit mounting was then bent outwards by about 2mm to ensure proper mating, but then that lost flexibility of adjusting the connectors mating. The Connector on the Power supply can move about 3-4mm sideways to ensure the mating on the main board. That was not a problem as once installed there is no need to move the power supply again till it fails.
Line trigger is the signal used by the SA in its trigger function. Thanks for the one who made the circuit schematic available of the board. Thanks Roumen for the schematic of Power supply.
Thanks for your inputs.
Regards, Kailash Khairnar
On Sun, Jan 31, 2016 at 9:48 AM, AMiTHA <amitha.my@...> wrote: Hi, Looking at your problem indicates maybe the filter Capacitor's ESR might be high, try changing the Filter Caps and see if you can bring up the supply back to 5.2V, most logic circuits will work intermittently when the supply drops below 4.8V.
Good Luck? Amitha?
|
Re: HP 8593E attenuator repair...
Yes, there is a very good chance that it is the same pad, but I can't guarantee it. At one time, the 4 GHz attenuators were the same as the higher frequency models except that they were not tested above 4 GHz. Some 4GHz attenuators may have been 22 GHz units that didn't perform quite as well above 4 GHz, so they ended up as 4 GHz units.
Vladan
|
Re: OT: Wiltron 360 NWA Disk Needed
Adrian,
What's a good way to give you these?
|
Thanks Pete, but I already have v4.2.2 for 8664A. I actually posted those in the Files section some time ago.
Cheers!
Colby
?
Around April I will be set up again to use my bench.
I have a couple broken 8664's with 4.2.1 and will get out the Data-I/O and one of them generators copy the ROMs.
But will be around April.
-pete
|
Have a 3325B and deciding if I should spend a time and $'s to fix the 3324A I have or take it to the next Ham swap meet.
One thing the 3324A needs is a new display.
Any thoughts on what a 3324A can do a 3325B can't ?
-pete
|
Around April I will be set up again to use my bench.
I have a couple broken 8664's with 4.2.1 and will get out the Data-I/O and one of them generators copy the ROMs.
But will be around April.
-pete
|
HP 8593E attenuator repair...
Hello,
Does anyone have experience in ordering attenuator pads from Keysight?
If I understand correctly, 10 dB pad for attenuator used in HP 8593E
is p/n 1GT1-3737 and this part is marked as "orderable" in
Find-A-Part. No price there. Maybe someone tried to order this part
last year or so, and know current price?
And, another question... I was able to locate a 4 GHz 70 dB attenuator
unit locally (p/n 33321-60045). Is there a chance that it use the same
pads as 22 GHz unit in 8593E?
--
Sincerely,
Yuri mailto:yuri@...
|
Re: HP 3582A won't start up
Chuck, thanks - that's good stuff.
|
Michael - AF7U