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Okay, I really appreciate it Dave. ?So what’s the difference really? Do they kind of function the same, but each message and response puts an email in your email account? Thank you again, Dan

I'd like to extend the power-off memory retention period of my HP 8753B from a week or two (it's original supercap) to "forever" (at least a very long time). Would it be possible to replace the

No problem. I saw the two messages in the moderator queue and it was pretty clear what happened, so I just put both through not knowing if you'd have a preference as to which one went. Keep in mind,

Looked at the schematic, which I should have done before replying. R-126, the hum balance, is in the filament line. The 10 Hz signal is described as a beat note on the output of the DC amplifier. I

I have not worked on a 412 for many years. Is it possible the hum balance is NOT power supply hum but the residue of the chopper?

I apologize, I have a duplicate thread. I didn’t realized the post had to be authorized before being posted. It can be deleted, use this thread for help. Thank you, Dan

Hello all, I am finishing up on a restoration of a HP 412A VTVM. ?It’s quite accurate from the get go after the restoration. I replaced every capacitor minus ceramics, I replaced pretty much every

Hello all, I am finishing up on a restoration of a HP 412A VTVM. ?It’s quite accurate from the get go after the restoration. I replaced every capacitor minus ceramics, I replaced pretty much every

Yves, Just a small additional update. I'm pretty convinced now the owner before the guy I got it from was already trying to fix this same issue. (I bought it from a guy who had bought it as broken but

There is no limitation for 8510C version as I know.

OK, so we both have the same firmware. I have both 8340B and 8341B with the same firmware. Do you maybe know what is the highest 8510C firmware version compatible with that 1AUG1986 for 8340/1B ?

1 AUG 1986

Dmitrij, Mine is also 2650 serial number. Which firmware version you have?

Not sure. As I see from assembly level service manual, there was many changes in hardware, including motherboard, CPU, YO, sweep control e.t.c. Need more time to analyse. My 8341B has 2650 serial

Yves, I agree, might be defective parts but i'm pretty sure alignment is also an issue. Measured the 3 trimmers for G4, G5, G6 in circuit: Measured in circuit R27 0.4840k R30 1.0731k R33 0.7642k They

Hi, This might be what you are looking for: https://joysignal.com/cables/ I don't know pricing and/or if they sell in small quantities. Regards, /John [email protected]> wrote:

I don't know a manufacturer source, but one way to get nice tiny coax is to cannibalize an HP/Agilent logic analyzer chassis-to-pod "ribbon" cable. ?The individual coax runs in the ribbon separate

Marco, For your control LOG/LIN switch, all seem good. For third converter RF CAL GAIN, I have 7.454V for -20dBm, but with CORR=OFF, same DC voltage, but -13.6dBm. For -20dBm on screen, I have

Hi Saevar, Dmitrij, It turned out that my 8341B sweeper has 1986 firmware and it has only two eproms soldered. Will it be OK to solder four eproms with 1992 firmware? Best regards, Wojciech

It's probably a Kingst LA5032 32 channel logic analyzer. Though, their could also be a "KingstWiz 32 ch analyser" Who knows? I believe, I have a CheeseWiz 32 cheese analyser" ... somewhere but, like