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.
|
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...
|
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?
|
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?
|
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
toggle quoted message
Show quoted text
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
|
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
|
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
toggle quoted message
Show quoted text
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
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
?
|
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?
?
?
|
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
|
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
|
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)
|
Looking for the manual for the HP H04-3460B or 3460B opt H04
I'm looking for the Service manual for the H04 version of the HP 3460B.? H04 adds an additional digit to the display and has improved accuracy.
Richard
|
Re: HP6209B component location layout
The current through the 100k pot is normally change that to 50k would require doubling the current to 6.4mA. This additional current will show up as an offset on the current meter. The 6207 manual should be close enough to use for troubleshooting.
Hugh Gilbert
I recently acquired a HP6209B, and already have the same manual as the one here in the files section, but it does not include the component layout, as it seems that page was left out during the scan. If someone might have a HP6209B paper manual, could they please take a clear hi-res picture of the parts location page and email or post it to the files section? I think the 6207B is almost identical so a picture of that component layout might also be helpful, if it has better resolution as the one present on the 07B 1970 manual I already have that looks very dark, lo-res and low-contrast, so not very usable at all.
The power supply seems to work just fine, other than on the 12mA scale the meter needle pegs all the way to the left beyond zero, even without a load connected. Guessing probably some resistor value has drifted, so a parts layout might be helpful to have. The 120mA scale seems to work fine after calibrating it (it was reading a bit low). And if I put a 10mA load while on the 120mA scale, and then switch to the 12mA scale it will read around 8mA, even after the calibration. About a second after disconnecting the load the needle will start to move left. Volt scales where reading 5V high, but after a meter zero and calibration they are now reading reasonably ok for an analog meter.
One other issue is that the current 10T pot seems a bit stiffer to turn than expected, but is still fully functional. On the other hand the volts 10T 100K pot was replaced with a 50K unit, and the tech even left a note about this inside the power supply taped on top of the main transformer, dated November 1981. The volts adjustment turns with normal feel, and also seems to work fine with this half value pot.
Thanks in advance.
|
HP6209B component location layout
I recently acquired a HP6209B, and already have the same manual as the one here in the files section, but it does not include the component layout, as it seems that page was left out during the scan. If someone might have a HP6209B paper manual, could they please take a clear hi-res picture of the parts location page and email or post it to the files section? I think the 6207B is almost identical so a picture of that component layout might also be helpful, if it has better resolution as the one present on the 07B 1970 manual I already have that looks very dark, lo-res and low-contrast, so not very usable at all.
The power supply seems to work just fine, other than on the 12mA scale the meter needle pegs all the way to the left beyond zero, even without a load connected. Guessing probably some resistor value has drifted, so a parts layout might be helpful to have. The 120mA scale seems to work fine after calibrating it (it was reading a bit low). And if I put a 10mA load while on the 120mA scale, and then switch to the 12mA scale it will read around 8mA, even after the calibration. About a second after disconnecting the load the needle will start to move left. Volt scales where reading 5V high, but after a meter zero and calibration they are now reading reasonably ok for an analog meter.
One other issue is that the current 10T pot seems a bit stiffer to turn than expected, but is still fully functional. On the other hand the volts 10T 100K pot was replaced with a 50K unit, and the tech even left a note about this inside the power supply taped on top of the main transformer, dated November 1981. The volts adjustment turns with normal feel, and also seems to work fine with this half value pot.
Thanks in advance.
|
LCR Meter E4980A Power On Test Fail
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
|
Repair HP3455A Multimeter
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
?
|
Ralf Rosche
Paul Bicknell
factory
