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410B Information wanted

 

I posted recently about my ancient 410B, which I finally repaired. I have a question: My meter was modified for the Amperex EA53 RF rectifier. In the handbook it states that the filament voltage for this tube should be set to 6.3 volts. I checked mine and found it was set to slightly more than 5 volts. That would have been correct for the Eimac rectifier. My question is was there some note somewhere about setting the voltage for the EA53 lower? In any case I set it for 6.3 volts, with the line set to 115V on a Variac. I checked the calibration and found it had not changed significantly. I had set it before with the lower filament voltage.
BTW, since fixing the power supply I also cleaned all the switches and pots with Deoxit D5. Cleaning made a difference in the stability of the zero adjustments for DC and ohms. I also cleaned the banana connectors on the test lead connector. From the case style and serial number this thing must be at least seventy years old. Works perfectly and seems quite accurate. Today I found a coaxial T adaptor on e-bay, will make the meter more useful.
Its an antique but continues to be very useful.
--
Richard Knoppow
Los Angeles
WB6KBL
SKCC 19998
Re: HP 8566B PL2 unlock error

 

After replacing the stepped attenuator, a separate but annoying fault, the PL2 unlock problem has disappeared.

The unit now functions as it should and passes self calibration.? Go figure...

Thank you to the group for your insight and help.
Re: 16801A Logic Analyzer Repair

 

I have had to change the motherboard and that has fixed the immediate problem, but now I get a frame id error. I am going to check to see if there is a registry key but does anyone know what it should look like ?
Re: HP8640B part 08640-60043

 

Hi Renaud,

That¡¯s the RF output board. The PA hybrid plugs into it at the top.

Cheers
Tom

Sent from an iThing; please forgive the typos and brevity

On Jun 15, 2024, at 09:39, Renaud F5ZR via groups.io <renaud.richard@...> wrote:

?Hi,
I just bought this spare part for my 8640B:
08640-67043 also E-1716-4
HP8640B part 08640-60043

 

Hi,
I just bought this spare part for my 8640B:


08640-67043 also E-1716-4
I didn't need it but it was quite cheap so I took it.
I only found one reference for it in HP 8640 ARMY_parts 40 pg(1).pdf

"CIRCUIT CARD ASSEMBLY 08640-60043 FSCM 28480 CONSISTING OF
CAPACITOR, FIXED, MICA DIELECTRIC...... 200 PF 5 PCT..." etc
I'm lost there. I wonder what this part is?
Thanks to put me on the right track if possible please.
Renaud
Re: HP 3852a extended memory modules info

 

All good feedback from everyone. thank you.
Re: Looking for internal photos of 04284-65007 'Interface Box'

 

We just use the std 4x BNC to test lead adapter.

No need for special fixtures at the DC and test freq.

Jon
Re: Looking for internal photos of 04284-65007 'Interface Box'

 

On Sat, Jun 15, 2024 at 10:33 PM, Dr. David Kirkby, Kirkby Microwave Ltd wrote:
On Sat, 15 Jun 2024 at 08:20, Jared Cabot via <jaredcabot=[email protected]> wrote:

After taking a look at the 4284A Operation Manual, I derived the internal wiring layout for the 04284-65007 Interface Box.
I uploaded a diagram as per the link below:
/g/HP-Agilent-Keysight-equipment/photo/295711/3793461/04284-65007%20Interface%20Box%20Wiring%20Diagram.png

If anyone comes across one of these and can take a photo of the internals, I'd love to see how it is constructed.
For now I'll make a version with point-to-point wiring, I'll upload more pictures once it's done.


Jared

I can't recall seeing that on the cal certificate of a 4284A which I had calibrated by Keysight. Not 100% sure. I managed to get a free option 006 (support for 4 m cables) from them, which might be very useful for a possible job I have coming up.
You can see the use of the box (or equivalent connections) for performance verification on pages 10-6 and 10-9 of the 4284A Operation Manual. It is used on a few other instruments too for performance verification, but I don't think it is used for the actual calibration/adjustment IIRC.


Jared
Re: Looking for internal photos of 04284-65007 'Interface Box'

 

On Sat, 15 Jun 2024 at 08:20, Jared Cabot via <jaredcabot=[email protected]> wrote:

After taking a look at the 4284A Operation Manual, I derived the internal wiring layout for the 04284-65007 Interface Box.
I uploaded a diagram as per the link below:
/g/HP-Agilent-Keysight-equipment/photo/295711/3793461/04284-65007%20Interface%20Box%20Wiring%20Diagram.png

If anyone comes across one of these and can take a photo of the internals, I'd love to see how it is constructed.
For now I'll make a version with point-to-point wiring, I'll upload more pictures once it's done.


Jared

I can't recall seeing that on the cal certificate of a 4284A which I had calibrated by Keysight. Not 100% sure. I managed to get a free option 006 (support for 4 m cables) from them, which might be very useful for a possible job I have coming up.

Re: HP 70004A with Video DRAM error

 

I recently encountered an ¡°A5 graphics DRAM error¡± on my 70004 display and while web searching came across this thread.? Initially my inclination was to try replacing the 16 VDRAMs on the A5 processor board but seeing the original posters lack of success I decided to do a bit more debugging.? The service manual, 70004-90046, on page 4-43 describes the procedure to test each DRAM type.? When running these tests I found that the GSP VRAM of which there are 16 was fine but the GSP DRAM test showed an error on bit 4.

Consulting the 70004 CLIP showed bit 4 to be on U102, after replacing this 64kx4 DRAM my 70004 display is now working fine.? I hope this might help someone else.
Re: Several problems with Agilent 54810

 

Re,
Can you confirm if the din interface of the Atlas 757 PCi3 board (in the Agilent 54810A) is in XT or AT format.
I made myself a ps2/ Din adapter, but no communication, except the reset of the 3 leds at startup.
Has anyone managed to put on a PS/2 keyboard?
I am blocked with that!
thanks
cdt
Re: Looking for internal photos of 04284-65007 'Interface Box'

 

After taking a look at the 4284A Operation Manual, I derived the internal wiring layout for the 04284-65007 Interface Box.
I uploaded a diagram as per the link below:
/g/HP-Agilent-Keysight-equipment/photo/295711/3793461/04284-65007%20Interface%20Box%20Wiring%20Diagram.png

If anyone comes across one of these and can take a photo of the internals, I'd love to see how it is constructed.
For now I'll make a version with point-to-point wiring, I'll upload more pictures once it's done.


Jared
Re: Flea Market HP 410C

 

Great read, Gianni!
Several problems with Agilent 54810

 

Hello,
I am asking you to move forward on several issues.
First this oscilloscope did not start at all.
I found the failure by dismounting the main acquisition board which had a capacitor on the burnt-out, short-cuircuit -12v. Now power supply OK, it starts. All voltages controlled. Good!
Of course on 2nd failure, the disc is completely? mechanically out of order. To be see later so disconnected at this time.

Now on the outside screen, i have the bios and its errors.
I have the impression that the retro lighting does not work (in theory powered by 12v and give HT.) LCD screen? black. I don¡¯t think there is a feature that starts the retro backlight later.?Can you confirm that it simply starts basicly when power on.

As, there is no keyboard, I wanted to plug one.It ¡¯s a 5-pin din on an Atlas 757 PCI3 board. So I adapted the cable of a PS2 keyboard? (cut + welded a din).?It initializes (flash of the 3 leds at power on) but after? impossible to communicate.
So is the keyboard accounting AT or XT, it¡¯s not the same protocol ? Somebody have made the test?
So for that i am? blocked for the bios

Thanks for your answers
cdt
Re: HP 8970B with 346B Noise source - Error 13

 

Apart from suspecting the 5dB pad in the 8970B...

I will hint at a solution to this problem may be the supply voltages out of tolerance.

Check all DC voltage levels on the various boards and modules. NOT by measuring at the PSU test pins.
I once had a similar problem in an 8970A. That instrument repeatedly failed self calibration with various
error messages. All voltages checked out OK on the PSU but on the (large) CPU board, the TTL 5V
was somewhere like 4.3 to 4.4V and fluctuating. There are several axial inductors that decouple the
DC voltages, one of which had a too large DC resistance. Once replaced, the instrument returned
to fully functional.

Cheers

Ulf / SM6GXV
Re: HP 8970B with 346B Noise source - Error 13

 

It works on the 8970A and reports +4dB after calibration.
It doesn't work on 8970B.

Do you have a 8970A and 346B to check the uncorrected value reported?

On 14/06/2024 13:01, DF6NA Rainer via groups.io wrote:
Am 14.06.2024 um 10:59 schrieb DF6NA Rainer:

E 13 =>? ENR must be 11dB minimum at 30MHz - the HP346b has 5dB ! ! !
SRI it's the 346A?? ! ! !
Re: HP 8970B with 346B Noise source - Error 13

 

Am 14.06.2024 um 10:59 schrieb DF6NA Rainer:

E 13 =>? ENR must be 11dB minimum at 30MHz - the HP346b has 5dB ! ! !
SRI it's the 346A?? ! ! !

Am 14.06.2024 um 10:49 schrieb Razvan Popescu via groups.io:
Hello,

Since the thread about cheap noise source on the other list got very
interesting and I was doing some repairs on my HP 8970A and 8970B I
would like to ask some questions which I am not sure how to approach.

I bought a 346B some years back and used it with my 8970A and all was
OK, recently I got an 8970B with E70 error. I found the 1st EPROM broken
and replaced it with the firmware found on KO4BB site. Since I was
inside the unit also replaced the battery.

And here the problem started...

After battery replacement I had E80 so I proceeded with the calibration
33 SP and the 346B source. Problem is that it fails in around 1-2
seconds with E13. E13 is saying that it is practically not enough ENR
coming from the source?! Correct me if I'm wrong.

So I powered on the 8970A and tested the source there. All OK and 33.1
SP works fine and shows around +4.x dBm uncorrected value after it finishes.

From my readings on the HP lists I saw some people reported that the
value should be +6 to +8 dB uncorrected. WHy I only see +4 dB?

So I am not sure now if my 346B is broken or the 8970B is broken since
everything works on 8970A. Another possibility would be that the 5dB
attenuator pad in the 8970B is broken.

Can someone tell me what is the uncorrected value for the 346B and 8970A
after calibration? Is there any difference in reported uncalibrated
value between 8970A and 8970B?

Best regards,
Razvan
Re: HP 8970B with 346B Noise source - Error 13

 

E 13 =>? ENR must be 11dB minimum at 30MHz - the HP346b has 5dB ! ! !

Am 14.06.2024 um 10:49 schrieb Razvan Popescu via groups.io:

Hello,

Since the thread about cheap noise source on the other list got very
interesting and I was doing some repairs on my HP 8970A and 8970B I
would like to ask some questions which I am not sure how to approach.

I bought a 346B some years back and used it with my 8970A and all was
OK, recently I got an 8970B with E70 error. I found the 1st EPROM broken
and replaced it with the firmware found on KO4BB site. Since I was
inside the unit also replaced the battery.

And here the problem started...

After battery replacement I had E80 so I proceeded with the calibration
33 SP and the 346B source. Problem is that it fails in around 1-2
seconds with E13. E13 is saying that it is practically not enough ENR
coming from the source?! Correct me if I'm wrong.

So I powered on the 8970A and tested the source there. All OK and 33.1
SP works fine and shows around +4.x dBm uncorrected value after it finishes.

From my readings on the HP lists I saw some people reported that the
value should be +6 to +8 dB uncorrected. WHy I only see +4 dB?

So I am not sure now if my 346B is broken or the 8970B is broken since
everything works on 8970A. Another possibility would be that the 5dB
attenuator pad in the 8970B is broken.

Can someone tell me what is the uncorrected value for the 346B and 8970A
after calibration? Is there any difference in reported uncalibrated
value between 8970A and 8970B?

Best regards,
Razvan
HP 8970B with 346B Noise source - Error 13

 

Hello,

Since the thread about cheap noise source on the other list got very
interesting and I was doing some repairs on my HP 8970A and 8970B I
would like to ask some questions which I am not sure how to approach.

I bought a 346B some years back and used it with my 8970A and all was
OK, recently I got an 8970B with E70 error. I found the 1st EPROM broken
and replaced it with the firmware found on KO4BB site. Since I was
inside the unit also replaced the battery.

And here the problem started...

After battery replacement I had E80 so I proceeded with the calibration
33 SP and the 346B source. Problem is that it fails in around 1-2
seconds with E13. E13 is saying that it is practically not enough ENR
coming from the source?! Correct me if I'm wrong.

So I powered on the 8970A and tested the source there. All OK and 33.1
SP works fine and shows around +4.x dBm uncorrected value after it finishes.

From my readings on the HP lists I saw some people reported that the
value should be +6 to +8 dB uncorrected. WHy I only see +4 dB?

So I am not sure now if my 346B is broken or the 8970B is broken since
everything works on 8970A. Another possibility would be that the 5dB
attenuator pad in the 8970B is broken.

Can someone tell me what is the uncorrected value for the 346B and 8970A
after calibration? Is there any difference in reported uncalibrated
value between 8970A and 8970B?

Best regards,
Razvan
Re: Looking for microwave frequency counter

 

Thanks to all that replied and helped me find a counter. I settled on an HP 5342A from a list member.

Thanks
Gary K4FMX
7081 - 7100 of 151506