In the course of refurbishing an old -410b, I was a bit confused in that my unit does not correspond to a manual stored here in our Files section.? So, I purchased a manual online and discovered that it matches the unit that I own, so I have scanned it and loaded into our files section today.? Cheers.
--
Ron Lawson
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Re: LCR Meter E4980A Power On Test Fail
Thanks Nigel, I have updated the firmware from A.04.00 to A.05.00. Unfortunately, the failure persisted. Since it was able to passed all other tests, except CPU[2]: 16 tests failed, it seems like a hardware issue on the CPU board? I will have to order some IC parts to replace on the CPU board.
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Best regards,
KC
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RF Alignment Failure in Agilent CXA signal analyzer N9000A
I have Agilent CXA Signal Analyzer N9000A, I'm getting these errors, please help.
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I referred manual and it suggested to check 50Mhz with -24dB, But when I check in my equipment its showing 50Mhz with -60dB. While I trace it out it was across H270(HMC270MS8G) where I was getting 50Mhz with -60dB but near FPGA it is exact 50Mhz with -24dB, so does it represent there is problem with H270 or any other if yes please help me, And any blue print of this will help a-lot.
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Re: Request HDD image for Agilent Infiniium DCA 86100C mainframe
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Re: HP83712B EPROM content
No, it is not the same as for the 83732A. I tried but it is not working properly.
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Re: HP83712B EPROM content
"tom_iphi via groups.io" <iphi@...> writes: Hi,
does anyone happen to have the data of EPROMs U7 and U24 of the HP83712B?
I seem to have lost data... ko4bb has Not sure whether that's the same.
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Hi,
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does anyone happen to have the data of EPROMs U7 and U24 of the HP83712B?
I seem to have lost data...
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Tom
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Re: HP 85047A test set on 8753A analyzer -- switch control board jumpers to retrofit for opt 009 (mechanical switch)
Working on a 85047A test set which needs to be retrofitted with mechanical switch 33311B,
Any suggestions at this point?
I have looked at the circuit diagram of the 85046A, and noticed a capacitor value changed between the mechanical and electronic relays. Could that be the problem?? Dave
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Re: E5052A Power On Test (3.3V Bus Supply)
Appreciate the suggestion. I reinstalled the A3 and tried cycling all the PSU connectors, including the motherboard one. I also brushed a tiny dab of Deoxit D100 on each male pin and cycled the connectors a few times.
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Unfortunately, no changes.?
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I also checked all of the power supply test points that are made accessible. All of the voltages seemed present and at a reasonable level:
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One thing I observed on the back of the A3 board are the presence of red LED. These seem to be connected to different power rails on the back of the board.
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I noticed that 1 LED was very dim and the other was not lit. These are visible with the outer cover off, through the chassis air holes where the A3 is slotted.
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The 2 LEDs in question are the bottom most ones, which are connected to the 2 TO-220 voltage regulators U18 and U19.
Not sure what the "normal" condition should be; are both normally lit when no issues are present?
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U19 is an ON semi CS5208-1. Datasheet is as follows:
Compare to U18 which is an LT1085:
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The CS5208-1 is not available anymore, but the LT1085/1084 are. As far as I can tell, these are nearly identical regulators?
The CS5208 is rated to higher currents (6V, 9A) while the LT1085/4 is tolerant of higher voltages (30V, 3/5A). However, the pinout and output divider adjustment equations are identical?
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I can get the LT1084 on Digikey. Maybe its worth swapping both U18 and U19 out with new LT1084 and seeing if anything changes?
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Re: Tricks and thoughts about the 3457A battery
Thanks, I will order a few pieces to have them just in case.
Best regards,
Razvan
toggle quoted message
Show quoted text
On 01/04/2025 12:01, Joel Setton via groups.io wrote: Hi Razvan,
I used a Radiospares 185-4654 socket, which sells for one Euro or so. It
turned out to be a no-brand Chinese import, you can find the same socket
on Epay or other sellers. I could not find this type of socket from
"premium" brands, like Keystone and others.
By the way, the same type of battery is sold as "ER14250" by some
vendors, and is available from some vendors with leads and a 2-pin
female connector. You may also want to investigate this type of solution.
Cheers,
Joel
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Re: HP 53310A modulation domain analyzer memory upgrade
After a set from Aliexpress that didn't work, I got some from an eBay vendor I've found reliable (his stocks are all old, before the dodgy cloning started).?
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I don't remember exactly what I bought but he has and I'd expect them to be good.
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Re: HP3325A Trouble, Calibration FAIL 2 & 3
Hi all,
I spent some more hours with my 3325A.
I made a new effort and studied the service manual from scratch. The main trouble shooting flowchart directed me to group J, so I thoroughly examined everything around U28 to U40.
At least U39 was the culprit! ?It is another analog switch. 1826-0879, hard to find. My REV C Board has many can type opamps and ics. I found a replacement a DG301 from Harris or an TL460 from TI. But the pinout is different. I had to mount the TI reverse and soldered the pins in place.
Now it is working perfect again. I have to calibrate this nice generator, but this is not a big thing. A member here has sent me a detailed calibration guide.
Ralf
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Re: E5052A Power On Test (3.3V Bus Supply)
The first thing I recommend that you do is to look at all the PSU cables in the PSU area including the big multiwire one that loops back to the motherboard.
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As a first attempt, try partially removing each connector from its header and walk it up and down a few times on its header pins to try and remove any oxidation. Do this for all the connectors in this area including the big multi-way connector that loops back the CPU area. I think this one has lots of brown wires. Wiggle and walk them all in their pins and retry the unit. It could be that you have excess voltage drop in the connections to the A3DSP board.
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?
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Re: HP6209B component location layout
Forgot to mention, I am thinking of leaving the 50K voltage adjustment pot in place as is, even tough already ordered a 100K replacement Bourns "Helipot".
Everything seems to work fine, and I can adjust output voltage from 0-320V no issues. Well, maybe I'll take another stab when it arrives.
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Re: HP6209B component location layout
I poked around a bit further and discovered that the +43V reference supply that was reading low at 34.2V actually had 14V of ripple on it. After removing and checking C12 a 450uF 85V cap, it was reading 135nF. Replaced with 470uF 100V cap, and voltage came up to 43.4V. Then did the whole volt and current meter calibration, and the 12mA range was no longer pegging to the left, but now rather indicating about 4mA without any load.
Put a 5K 10T pot in parallel to the existing 30K R38 resistor and was able to zero the 12mA range without affecting the 120mA. The pot was reading 2.7K, which I then replaced with a fixed resistor and now the 12mA scale was almost zeroed, only a hair above zero, so left it there for now. It seems that the circuit really wants about 2.4K in parallel to R53 (30K with the 2.7K from the pot) to properly balance the bias on the 12mA scale, but until I can get the proper resistor did for now leave both the 30K and the newly added 2.7K in place.
Both current ranges now seem accurate (as much as that analog meter will allow). Tested the 120mA with a 2.5K 10W at 250V and meter showed 100mA right on the money, verified with by DMM also in circuit. Then put a 10mA load and the meter on 12mA scale was showing also almost right on the money.
Lesson learned, check the main caps first, you dummy.
Also checked C20 (25uF 475V) at the rear output and it read 26uF with 2.0 ohms ESR. Good enough.
The C14 main supply cap seems to be good as well, kind of a pain to remove and test, so just read the DC and AC voltage across it with DMM while output voltage was set to 320V. The cap had 334.5VDC and 0.477VAC ripple across it. With the output of the power supply still at 320V and no load, there was about 1mV of AC ripple (on the DMM), and with a 100mA load about the same amount of ripple.
I think that it can now be called good to go.
BTW needed to slightly adjust the meter mechanical zero so had to remove it, and then while trying to get it back in place was wondering who came up with that plastic mounting clip scheme. What a pain in the rear to make both sides click back in place.
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Re: HP 85047A test set on 8753A analyzer -- switch control board jumpers to retrofit for opt 009 (mechanical switch)
I believe the control module (rear panel) has one or more abnormalities - I tried setting attenuator (stimulus>power>attenuator 1) and rather than adjusting the attenuator, the test set switched ports or had other abnormal responses depending on the selected attenuator value. This misbehavior occurred regardless of W1 and W2 jumper presence/absence.
Given this, my original posting about setting option 009 is incorrect as the test set is malfunctioning in other ways and will require repair, not just reconfiguration. (I re-routed cable back to my original test set and it continues to work normally, so the issue is in the test set under consideration.)
Dave
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There is some information on the low band module A24 in here starting page 36:
I see now that this is a microcircuit and not repairable.
I suppose, in my low band module the oscillator has drifted over time such that it locks now to the wrong 100MHz harmonic.
A pitty, one would just have to re-tune the oscillator if it was possible.
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Does anybody know where I could obtain a replacement for the broken A24 low band module of my 83651A?
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Tom DG8SAQ
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Re: HP 53310A modulation domain analyzer memory upgrade
Thanks Ozan..!
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Will report back here on the transition from SOJ to DIP for those that may follow...
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Dear friends, I ask you if possible to help me solve my problem: I have SA HP70000 and a HP70820a that worked perfectly.
At a certain point without having used it improperly an error occurred (7301 ch 1 up bus, wr addr: bit).
I ask you if anyone has info or has had the same problem.
I ask for your help in trying to solve it.
Thanks
Gianni
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Re: Tricks and thoughts about the 3457A battery
On 3/31/25 22:12, Martin via groups.io wrote: Or the other way round? Put the instrument on an isolation transformer. I've got nice isolation transformers for sale if anyone needs one. MGE Ultra Isolation 2.4 kVA and smaller.
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Dr. David Kirkby, Kirkby Microwave Ltd
Kevin A.
Ralf Rosche