Re: HP6209B component location layout
For the sake of testing with correct values, I added a 47K resistor in series with the existing 50K voltage pot, and replaced R13 with 62K, but on the 12mA range without a load the meter needle still jumps to the left as before.
I also kind of recalibrated the 120mA scale with about 70ma by adjusting the voltage control for maximum output (now only about 160V) and connected an external resistance load with a 1.5K in series with a 2.7K (both 10W) and an external DMM on the 500mA scale (I did not have the 3185 ohm resistor called for in the "legal" cal procedure). Then rotated the current pot up CW until the DMM would read exactly 70mA, and then adjusted R56 current calibration control so the meter needle would also read 70mA. Then lowered the current pot down CCW for a 10mA reading on the DMM, switched the meter over to the 12mA scale, but it only read a hair under 5mA. If I then pushed the current up by rotating the current control CW until the meter needle would read 10mA, the external DMM would now indicate 13.1mA.
If I then remove the load, the meter needle would do a slight twitch and after about a second (not immediately) would start swinging towards the left rather slowly and go all the way down past zero. Pretty much same behavior as it was doing before I tinkered to correct the R10 and R13 values.
So looks like something else might still going on here, or am I missing anything? Just replacing R10 and R13 with their more correct values appears will not alone solve the issue with the 12mA meter scale.
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Hello Paul,
The replacement for the 432A from Keysight is called N432A. Can be used
with normal sensors and also with the 478A. Make sure you get the right
adapter cable.
You can get better accuracy from the old 432A by connecting a 6.5 digit
DVM on the back side of the meter.
This is what the Tegam 1830A is in fact. It has the DVM incorporated
inside so you have a single unit.
1830A is fairly new and I think we will not see them on eBay for a long
time from now. If you want to get one I think only new one from Advanced
Energy it is possible for now. If you find some cheap ones let me know,
I am also interested :)
Advanced Energy is the new owner of Tegam, they were bought in June 2021.
Best regards,
Razvan
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On 29/03/2025 00:02, Paul Bicknell via groups.io wrote: Hi All
Has anyone used the TEGEM ?1830A RF Power Meter? a? HP 432 Replacement
or the new Keysight Replacement for the HP 432
as i have just bought a HP 478A? Option H72 and would like to get an
accuracy of better than 0.5 % accuracy out of it
I have put all i have about the TEGEM ?1830A RF Power Meter in the? Files
A temporary directory for photographs and help relating to emails and
posting
Regards Paul
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Re: Repair HP3455A Multimeter
2N4119.
A bit more investigation this morning.
I have on error 10 ?A10U6 and A10U5 Pin 13 the correct 10 Volts, the drivers U16... are ok.
The inputs are correct as listed in the manual.?
On A10U5 PIN14 I see 8 Volts, should be -24 Volts,?
May be its an error in the manual?
If I open Q21, which is connected to PIN 14, then error 8 and 5 comes up, as expected.
Connecting shortly PIn 14 of A10U5 to -24V clears ?the error 10.?
Hmm very strange.?
I tested Q4 and Q19, they are ok with multimeter, as JFets can be tested with a simple multimeter.
However, I am waiting now for the 2N4119 and will replace them. This are the only involved cal switches mentioned in the flowchart.
Ralf
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Re: HP6209B component location layout
Actually the note left inside the power supply about R10 also mentions R13:
"R10 voltage helipot should be 100K R13 ~ 62K. Replaced with 50K Heli 11/19/81 GPM".
I checked the existing R13 and its a 2K 1W 1% (red-black-black-brown, brown). I verified it by desoldering one side and indeed it reads 1.993K.
Seems like he was trying to compensate with R13 for the half value R10 potentiometer.
So I am wondering if this present setup would still cause the meter needle offset to the left without a load in the 12mA scale, as mentioned earlier? or do I still have some other problem I need to look into?
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"Sven Schnelle" <svens@...> writes: "Jean-Luc F1ULQ via groups.io" <f1ulq@...> writes:
Hi Sven,
you have to place a new CR2032 on the mainboard, then do a CMOS
default and set the correct date/time.
Normally, after that all should be OK. I had the same issue on mine,
fixed it that way. Thanks, good to know that this must work - i was afraid of some bug or
unknown procedure. In the beginning this didn't work for me with the
symptoms I described. I left the unit without battery for a night and
than it worked the way you described and i was happy. But Windows XP
crashed later during the day, and after that it didn't work again. Also
had some problems that USB didn't work.
I now bought an old used mainboard with the same form factor and PCI
slots, an Asus P8B75. Hope i can implant this, not sure how compatible
the Agilent Software is with other boards.
Would also be a nice upgrade as this one has an i5-3330. Maybe i'll even
try Windows 7. I now have the Asus P8B75 in place. There are a few remarks: - The Asus has 2 instead of 3 PCI slots. I decided to remove the USB client side Controller, luckily the E5071C software doesn't complain if it isn't present. Another option would have been to replace the PCI 82350 GPIB controller with a PCIe version so one would need only 2 PCI slots and one PCIe slot. - No LVDS port on the ASUS mainboard. As the origin screen had a resistive touchscreen with really bad picture quality compared to todays TFT and touchscreen wasn't working properly, i bought this one as a replacement: This requires a cable fromt the outside HDMI port to the HDMI LVDS converter, and getting 12V from the power supply. The touchscreen is connected via USB, and doesn't need any special drivers. Mechanically the display is a perfect fit - only the mounting screw locations are a bit different, but that can easily be adapted. - Instead of Windows XP, i put Windows 7 on it. The E5071C software communicates via Windrvr 6 to the Agilent PCI card, i used windrvr6.sys from the Xilinx USB cable drivers because this one is signed while the Agilent XP driver isn't signed. So i now have the E5071C software from Windows XP running on Windows 7. If someone has a E5071C with factory Windows 7 or 10, i would be interested getting a copy of the E5071C software. I wasn't able to install the E5071C Windows 7/10 software from keysight, the installer always hangs when trying to install the LXI web service. The only remaining issue is that i get some 'VBA can't be started' error message during selftest. Have to figure out which package is missing. But i guess i'll never use VBA, so even if this doesn't work it's not a big deal.
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HP 6268B 0-40V 0-30A PS schematic
Anyone know where to find better than this scan from the Keysight site?
It's not quite legible...
I found mil manual that is well scanned:
It's for the 6269B only, where the commercial HP manuals wee about the full range, but the component numbers are the same and along with the commercial HP manual, one can figure it out.
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HP 6268B 0-40V 0-30A PS schematic
Anyone know where to find better than this scan from the Keysight site?
It's not quite legible...
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Re: HP6209B component location layout
You will also likely need to replace R12,13 parallel combination ~2K ohm 3W. R13 is a 1/2W trim resistor, this is between a 6.2V source and terminal A7 on? the back. the equation is (6.2V/2k)*100K=310V. This sets the current through the voltage adjust pot and the max output voltage.
Hugh Gilbert
Thank you for the information, that saved me some ghost hunting for drifted resistors in the meter circuit.
Both the voltage and current adjustment pots are Bourns series 3540 which are rated at 2W.
Voltage Adj: 3540S-419-503 (50K)
There is also another part number on them, which seems to be Tektronix related:
311-0946-00: "Tektronix Test Equipment Potentiometer Precision 10 Turn 50K 5% Lin = .05%, Bourns Part # 3540S-419-503".
Current Adj: 3540S-504-203 (20K)
And also has: 3100-18S7 but search did not lead to anything related.
The replaced 50K voltage adjustment pot has a very thin (about 1/8") shaft, and the current adjustment one has a regular 1/4" shaft. Both have identical looking grey knobs with a black inset despite the different shaft diameters. After comparing them with online pictures of the power supply they are definitively different from the original ones, and only the black meter select switch knob seems to match. Taking another look at those two knobs, they definitively look very Tektronix like and this makes me think that the tech that serviced the power supply might have had access to Tek parts, and chose the 50K and corresponding knob just to make do, and even replaced the knob on the current adjust to match.
Was thinking that will now need to ideally find the equivalent 100K Bourns 3540S-419-104 (if that is an actual existing valid number) with the same 1/8" shaft to match the existing knob. But can't seem to get anything on that PN, neither does searching for 3540S-504-104. Instead all I am finding is 3540S-1-104 which is also 100K with the same linearity specs but with a 1/4" shaft. It does come up at Mouser as Obsolete, but they suggest the alternate 3540S-1-104L ROHS part instead for $34. Ebay also has a couple of options at around $20-$25.
Seems like not going to find anything with a 1/8" shaft, so by any chance does anybody have a pair of the correct original matching black HP 1/4 inch shaft knobs?
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Re: HP6209B component location layout
Thank you for the information, that saved me some ghost hunting for drifted resistors in the meter circuit.
Both the voltage and current adjustment pots are Bourns series 3540 which are rated at 2W.
Voltage Adj: 3540S-419-503 (50K)
There is also another part number on them, which seems to be Tektronix related:
311-0946-00: "Tektronix Test Equipment Potentiometer Precision 10 Turn 50K 5% Lin = .05%, Bourns Part # 3540S-419-503".
Current Adj: 3540S-504-203 (20K)
And also has: 3100-18S7 but search did not lead to anything related.
The replaced 50K voltage adjustment pot has a very thin (about 1/8") shaft, and the current adjustment one has a regular 1/4" shaft. Both have identical looking grey knobs with a black inset despite the different shaft diameters. After comparing them with online pictures of the power supply they are definitively different from the original ones, and only the black meter select switch knob seems to match. Taking another look at those two knobs, they definitively look very Tektronix like and this makes me think that the tech that serviced the power supply might have had access to Tek parts, and chose the 50K and corresponding knob just to make do, and even replaced the knob on the current adjust to match.
Was thinking that will now need to ideally find the equivalent 100K Bourns 3540S-419-104 (if that is an actual existing valid number) with the same 1/8" shaft to match the existing knob. But can't seem to get anything on that PN, neither does searching for 3540S-504-104. Instead all I am finding is 3540S-1-104 which is also 100K with the same linearity specs but with a 1/4" shaft. It does come up at Mouser as Obsolete, but they suggest the alternate 3540S-1-104L ROHS part instead for $34. Ebay also has a couple of options at around $20-$25.
Seems like not going to find anything with a 1/8" shaft, so by any chance does anybody have a pair of the correct original matching black HP 1/4 inch shaft knobs?
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Re: LCR Meter E4980A Power On Test Fail
Sounds like that might be a firmware problem if it works when forced into an alternate mode.
If there is a firmware download it might be worth checking.
Regards? Nigel
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On 28 Mar 2025, at 12:09, KC Chong via groups.io <kcgpda@...> wrote:
?
Hi,
I am currently trying to repair an E4980A LCR Meter that is experiencing a power-on failure. When the unit is powered on, the self-test displays the following error message:
"E1000: Power On Test Failed: 100000,0,0,0,0,0,0."
All keys are locked and the device appears to be hung. However, when I enter service mode by pressing the Preset + Power On button, I am able to access all the keys and perform manual operations. I also conducted a manual self-test, and all tests passed without any issues.
Unfortunately, there is very little information available online about this specific issue. The data log I’ve attached shows a CPU[2] error (16), which could be a clue.
If anyone has any insights or has encountered a similar problem, I would greatly appreciate any advice or suggestions regarding the power-on test failure.
Thank you in advance for your help!
Sysinfo log:
ID: Agilent Technologies,E4980A,MY46312198,A.04.00
OPT: 200,710,710
POWER CYCLE: 482
POWER ON HOURS: 18165
SYSCAL REV: 1.00
SYSCAL DATE: 2014/12/10
R: Rev.1.01,,,
CPU[1]: 0
CPU[2]: 16
SYST[1]: 0
SYST[2]: 0
SYST[3]: 0
SYST[4]: 0
SYST[5]: 0
DATA[1]: 0
DATA[2]: 0
DATA[3]: 0
DATA[4]: 0
OPT[1]: 0
OPT[2]: 0
OPT[3]: 0
OPT[4]: 0
OPT[5]: 0
OPT[6]: 0
OPT[7]: 0
A1[1]: -1.189578915E+01
A1[2]: +1.163335800E+01
A1[3]: +5.106445313E+00
A1[4]: +3.349609375E+00
A1[5]: +2.490234375E+00
A1[6]: +5.102705002E+00
A2[1]: +6.593852455E-05
A2[2]: -4.669545332E-01
A2[3]: +4.929539280E-01
A2[4]: +4.640171965E-01
A2[5]: -4.558677030E-01
A2[6]: +5.084224205E-01
A3[1]: +5.968145488E-04
A3[2]: -8.684453465E-01
A3[3]: +8.727315869E-01
A3[4]: -7.707347339E-01
A3[5]: +5.249549693E-01
USER[1]: 0
USER[2]: 0
USER[3]: 0
USER[4]: 0
BATT[1]: +3.056640387E+00
+4.300000000E+01
+5.217538194E-01
+5.389070530E-01
?
KC
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Re: Repair HP3455A Multimeter
Hi Orin,?
thank you for the hint,? i ordered 2N4149A from Dugikey, hope this will solve my cal #10 error.
Ralf
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Re: HP6209B component location layout
Besides the effects on the metering, you may want to check the power rating of the volts pot. The original 100 kR value would dissipate about a watt at full output, now about 2 W with 50 kR. If these pots are the big old-school 2 inch diameter types, it should be no problem, but the modern smaller 1 inch ones I think are rated only about 1-2W. That could be why the note was left, to consider it.
?
Ed
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Re: Looking for the manual for the HP H04-3460B or 3460B opt H04
It would be better than nothing.? I actually got rid of my fiche reader/printer about 8 years ago after not having used it in over 10 years.? Never say never, LOL.
Richard Parrish
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I have some info for the 3460A-H04 but not the B
?
Looks like specs / service information.?
It is part of a set of fiches that cover 3460A specials and is a little randomly organized and poorly scanned
Seems like there are multiple copies including parts lists, board layouts and schematics
?
Would this be of help?
?
I'll keep looking for the B version
?
Peter
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Re: Repair HP3455A Multimeter
I'd try 2N4119A or PN4119A.? I might have some...
Mouser?are mighty proud of them.
On Fri, Mar 28, 2025 at 4:15?AM Ralf Rosche via <ralf.rosche= [email protected]> wrote: Hi,
my 3325A is driving me crazy and no one could help yet, so I went over to a faulty HP3455A multimeter. It worked many years, but now it comes up with a OL display in DC.
Cal test stops at 11,10,9,8,5,4,3,2,1,0 and a digital value 0.062.
?
All voltages are stable with nearly zero ripple. Vref is 10V, all perfect.
The good service manual (no extrem testing procedure with a signature analyzer as in the 3325A manual)? has many tables with listings of voltages for the individual cal number. The cal feature switches many fets to ground, vref etc.
?
I found suspect voltages at the outputs of U6 a LM339 and replaced it, this fixed some cal errors. The meter now has only cal error #10. Checking the flowchart for #10 and the voltage matrix a found a suspect output on Pin 14 of U5, so I replaced it with no success. The voltage is 8.8V, that seems to be the Gate Bias voltage after 100KOhms, i lifted the pin and supplied shortly -24v, but this was not suceccessful either.
To pin 14 there is Q21 connected, i suppose it does not switch off, Pin 14 should be -24V.?
?
Next I will? replace Q19, the part number is 5070-7074, but I can't find any information and it is not listed in the HP crossreference list. I has 4 pins, may be one pin is can and gate is tied to taht pin as i can measure the gate bias voltage at the can.?
?
Has anyone a spare part or a hint which fet i can use to replace the Q19?
?
Ralf
?
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Re: Repair HP3455A Multimeter
I don't find a 5070-7074
in the 3455A manual I downloaded, Manual P/N 03455-90003. Looking
for Q19, I find A10Q3, 4, 15, 16, 18, 19, 21? which is a 5081-7074
and A15Q19, 20, which is a 2N4391. ?
?You might try swapping Q19 with a different 5070-7074. You might
pass diagnostics, or at least find a different failure to
troubleshoot.
John??? KK6IL
On 3/28/2025 4:15 AM, Ralf Rosche via
groups.io wrote:
toggle quoted message
Show quoted text
Hi,
my 3325A is driving me crazy and no one could help yet, so I
went over to a faulty HP3455A multimeter. It worked many years,
but now it comes up with a OL display in DC.
Cal test stops at 11,10,9,8,5,4,3,2,1,0 and a digital value
0.062.
?
All voltages are stable with nearly zero ripple. Vref is 10V,
all perfect.
The good service manual (no extrem testing procedure with a
signature analyzer as in the 3325A manual)? has many tables with
listings of voltages for the individual cal number. The cal
feature switches many fets to ground, vref etc.
?
I found suspect voltages at the outputs of U6 a LM339 and
replaced it, this fixed some cal errors. The meter now has only
cal error #10. Checking the flowchart for #10 and the voltage
matrix a found a suspect output on Pin 14 of U5, so I replaced
it with no success. The voltage is 8.8V, that seems to be the
Gate Bias voltage after 100KOhms, i lifted the pin and supplied
shortly -24v, but this was not suceccessful either.
To pin 14 there is Q21 connected, i suppose it does not
switch off, Pin 14 should be -24V.?
?
Next I will? replace Q19, the part number is 5070-7074, but I
can't find any information and it is not listed in the HP
crossreference list. I has 4 pins, may be one pin is can and
gate is tied to taht pin as i can measure the gate bias voltage
at the can.?
?
Has anyone a spare part or a hint which fet i can use to
replace the Q19?
?
Ralf
?
|
Hi All
Has anyone used the TEGEM ?1830A RF Power Meter? a? HP 432 Replacement
or the new Keysight Replacement for the HP 432
as i have just bought a HP 478A? Option H72 and would like to get an accuracy of better than 0.5 % accuracy out of it?
?
I have put all i have about the TEGEM ?1830A RF Power Meter in the? Files
A temporary directory for photographs and help relating to emails and posting
? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ??
Regards Paul?
?
?
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Re: Looking for the manual for the HP H04-3460B or 3460B opt H04
ArtekManuals have at least one version of the 3460A manual, but not the H04 option.
?
I also have some info on the chopper oscillator modification, used in the later 3459/60 voltmeters, which is attached.
?
David
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Re: Looking for the manual for the HP H04-3460B or 3460B opt H04
The H04 manual for the 3460A is just the normal manual with some change sheets for the H04 modifications, if there is a 3460B H04 version you should be able to use the 3460B manual at the web archive, I could probably dig out the 3460A H04 change sheets to scan.
?
David
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Re: Looking for the manual for the HP H04-3460B or 3460B opt H04
I have some info for the 3460A-H04 but not the B
?
Looks like specs / service information.?
It is part of a set of fiches that cover 3460A specials and is a little randomly organized and poorly scanned
Seems like there are multiple copies including parts lists, board layouts and schematics
?
Would this be of help?
?
I'll keep looking for the B version
?
Peter
|
Re: Repair HP3455A Multimeter
Ralf,
Unless I am very mucht mistaken (...) the 3325 uses the chassis as GND, and **all** screws fastening the PCB should better be nice and tight. The PCB has no overall GND itself. This can drive you nuts, for obvious reasons.
Wilko
(who hopes he has remembered correctly)
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Ralf Rosche
Paul Bicknell
factory
