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Alignment of HP 412A after rebuild, having trouble with the first step.
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
By Dan · #148799 ·
Trying to go through alignment procedure for HP412A that I rebuilt, having trouble with first step lol
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
By Dan · #148798 ·
Re: Troubleshooting a 8591e with opt 130
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
By Marco · #148797 ·
Re: HP 8341B 1992 firmware version
There is no limitation for 8510C version as I know.
By §¥§Þ§Ú§ä§â§Ú§Û §À§â§î§Ö§Ó · #148796 ·
Re: HP 8341B 1992 firmware version
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 ?
By wojciechoo@... · #148795 ·
Re: HP 8341B 1992 firmware version
1 AUG 1986
By §¥§Þ§Ú§ä§â§Ú§Û §À§â§î§Ö§Ó · #148794 ·
Re: HP 8341B 1992 firmware version
Dmitrij, Mine is also 2650 serial number. Which firmware version you have?
By wojciechoo@... · #148793 ·
Re: HP 8341B 1992 firmware version
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
By §¥§Þ§Ú§ä§â§Ú§Û §À§â§î§Ö§Ó · #148792 ·
Re: Troubleshooting a 8591e with opt 130
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
By Marco · #148791 ·
Re: Shielded probe cables?
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:
By John Dusatko · #148790 ·
Re: Shielded probe cables?
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
By Mark Litwack · #148789 ·
Re: Troubleshooting a 8591e with opt 130
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
By Yves Tardif · #148788 ·
Re: HP 8341B 1992 firmware version
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
By wojciechoo@... · #148787 ·
Re: Shielded probe cables?
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
By Roy Thistle · #148786 ·
Re: VNA Resonance Methodology
OK thanks. As you can see, you can measure both resonance and Q at the same time with the shunt resonator method. The null frequency gives the resonant frequency and the depth of the notch can be used
By jmr · #148785 ·
Re: Troubleshooting a 8591e with opt 130
Yves, I double checked and filled the table like you did *Log* *Lin* *VLOG2* -7.990 10,092 *VLOG3* -8,015 10,089 *VLOG1* -8,07 10,087 *-8VT* -8,236 -8,236 *VLIN* 3,672 -6,624 *VLOG/VLIN* 3,695 -8,005
By Marco · #148784 ·
Shielded probe cables?
If we think about the nice logic cables that come with the HP MSOs, ie a flat, presumable shielded cable, a box and then thin, flexible, presumable shielded cables that go to the probes. I would love
By Anders · #148783 ·
Re: Tantalum Capacitors
I've watched a few of his videos, and his troubleshooting methods are irritatingly slow. He reminds me of newly graduated tech school students that shotgun ded equipment rather than develop the skills
By Michael A. Terrell · #148782 ·
Re: Troubleshooting a 8591e with opt 130
Marco, For my 8595E, module A12, after power on, if CORR=ON, IFA1-A4 are OFF and IFA5 is ON. From this point on, only when the REF LEVEL is at 0, +10, +20, +30, +40, +50 and +60dBm, IFA5 is ON, all
By Yves Tardif · #148781 ·
Re: Tantalum Capacitors
Adrian's Digital Basement But...AFAIR... he's a software 'engineer' whose hobby (fixing old 8 bit computers), turned into a full time YouTube channel. Well... okay. But. There are much better people
By Roy Thistle · #148780 ·