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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
Re: Looking for 1GG7-4210 amplifier datasheet

 

No, not Avantek. The IC (just the chip) is supposedly still in production at Keysight, but I have no idea if it's still available in that package. I think it was designed in the 1980s.

Vladan
Re: Looking for 1GG7-4210 amplifier datasheet

 

Could this be an Avantek part after spinning out from HP?
Re: Looking for 1GG7-4210 amplifier datasheet

 

Just a guess, in case you can't find the data sheet:

Vd=7V
Id is adjusted for 150mA max. or leave it at Idss if it's less than 150 mA.

Vladan
Re: Looking for 1GG7-4210 amplifier datasheet

 

The IC looks like an old HP traveling wave amplifier, but what¡¯s around it does not look like it was made at HP. The gate voltage (bottom left pin with the wire going to the feedthrough) is quite likely adjusted to give a certain drain current, so it won¡¯t be a fixed number on the data sheet. Vd is probably 5-7V. Sorry, I don't have the data sheet.

Valdan
Re: VISA problems with ancient test equipment?

 

Hello Tam,
thanks for your kind offer.
You can contact me via dk1vi at darc.de

Ernst
Re: HP transistor 1853-0063 or alternative?

 

My data base shows that this transistor has been replaced by 1853-0059. PNP, VCE-55V, IC-5A, PD-150W, FT-3MHZ, SI TO-3.

On 2024-06-06 6:41 pm, Robin Szemeti via groups.io wrote:
Would anyone care to suggest a suitable replacement for the HP 1853-0063? used as the 75V series pass regulator in the HP 3400A or perhaps has one lying around in the spares drawer?? My search of eBay failed to find one.

Mine seems to be C-E short ... which is sub-optimal
--
This email has been checked for viruses by AVG antivirus software.
www.avg.com
Looking for 1GG7-4210 amplifier datasheet

 

Hello,

I am looking for the HP 1GG7-4210 MMIC amplifier datasheet or at least the +VD and -VG values for this amplifier

Best regards
eric

DSCN6387.JPG

Re: RED light diffusing tape used in HP instrument displays

 

IIRC, the film used for LED displays was not only fairly monochromatic, but polarizing.? The idea was that light going through from the outside would be polarized, change polarization when bouncing off the inside, and then be blocked by the film.

Possibly you could combine both?

Harvey

On 6/12/2024 11:16 PM, vk2bea via groups.io wrote:
What about rubylith tape (like we used to use to make PCB artwork)?
3M makes tape (which is pricey) but you can buy sheets for a few dollars.
Re: HP 3852a extended memory modules info

 

Pay especial attention to the alphabet soup past the part number, and for that manufacturer, try to track it down to a specific outline in the data sheet.? Not all manufacturers give you a link to a specific JEDC standard part outline, so sometimes it's needed to go to the mechanical drawing.

Annoying at best.

Once you have a board design, note on the schematic or board the specific part, or using a specific part, make sure that the notes give the complete part number and equivalent outline/package.

Yep, annoying.

Harvey

On 6/13/2024 2:15 AM, Anders wrote:
That problem has bitten me numerous times in the past. What I try to do is to order the chips, then print out the layout on paper ans place the chips to check the spacing.
Re: VISA problems with ancient test equipment?

 

I have a few C# examples which work with quite old devices. Please email
me OFF list, as these are customer code and I cannot post them publicly.


Tam

With best regards
Tam HANNA

--
Enjoy electronics, 3D printing and cigars? Join more than 21000 followers on my Instagram at

Re: HP 3852a extended memory modules info

 

¿ªÔÆÌåÓý

Perhaps the best thing might be to make a new, dual footprint so that either narrow or wide will fit rather than overlaying one on another ¨C which will always produce DRCs.? It¡¯s rare that us ¡®amateurs¡¯ will be designing a board so dense that a wider footprint would be a problem with space.? I regularly make new footprints for odd devices, so a range of dual ones covering (perhaps) SO8 up to whatever (SO20?) and then use them thus covering all possibilities (until something else comes along of course!).

?

As I always hand build all my boards I tend to make the footprint pads a bit longer on the outside of the device as it makes hand soldering a bit easier!

?

All this aside, I think you¡¯ve done a super job on these boards. ?It¡¯s a long time since I was designing systems with discrete processors and memories (often 68000-based stuff) that it was refreshing to see someone still doing much the same.

?

73, Mike,

Mike Stevens,

G8CUL/F4VRB.

?

From: [email protected] <[email protected]> On Behalf Of Maciej Kawalkowski via groups.io
Sent: Thursday, June 13, 2024 1:33 AM
To: [email protected]
Subject: Re: [HP-Agilent-Keysight-equipment] HP 3852a extended memory modules info

?

Here is the pad difference seen on? half of U1 shown with SO20W and other half with both SO20 and? SO20W. Routing is possible but a few tracks and vias had to be moved. SO20W and SO20 overlap.
This is for illustration only.
?

Re: VISA problems with ancient test equipment?

 

Hello Yves,
thanks for your detailed reply.
I am not familiar with vb.net, so probably there are a few more code lines necessary for initialisation of the program. Maybe you can send me this code.

Will test your solution as soon I can.
BTW I also use the? USB-GPIB interface 82357B

Regards Ernst
Re: HP 3852a extended memory modules info

 

That problem has bitten me numerous times in the past. What I try to do is to order the chips, then print out the layout on paper ans place the chips to check the spacing.
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