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Re: 8495G Step ATT OPT 011 5V Cable Pinout
TNX, what pin number is the Minus?
By 4X6MU · #151250 ·
Re: 8495G Step ATT OPT 011 5V Cable Pinout
Minus is used to switch the attenuators Am 06.04.2025 um 18:50 schrieb 4X6MU via groups.io:
By DF6NA Rainer · #151249 ·
Re: 8495G Step ATT OPT 011 5V Cable Pinout
TNX Rainer, Which pin is (-) or GND? ILAN 4X6MU
By 4X6MU · #151248 ·
Looking for crystal test fixture 41901A details
Does anyone have 41901A SMD crystals PI-network test fixture? https://www.keysight.com/gb/en/assets/9018-01432/user-manuals/9018-01432.pdf I would like to have a good close-up photos of what the
By Leo Bodnar · #151247 ·
Re: Manuals for an HP3456B DMM?
Thanks for the inputs on the issues for this meter. I have written tools for several "R2D2" instruments. The command set is similar to the 3455A which I have already written a tool set for. One thing
By BobH · #151246 ·
Re: Manuals for an HP3456B DMM?
I'm not sure how luck plays into programming the 3456A, it is a very rigidly defined state machine that is well documented in the operation manual. The 3456A is programmed using an slightly enhanced
By Chuck Harris · #151245 ·
Re: E5052A Power On Test (3.3V Bus Supply)
Glad you got it fixed! I did look through the program code and found references to your errors but I couldn't find an obvious cause, only ways to patch past the errors. There are some diagnostic
By jmr · #151244 ·
Re: 8495G Step ATT OPT 011 5V Cable Pinout
Am 06.04.2025 um 08:00 schrieb 4X6MU via groups.io:
By DF6NA Rainer · #151243 ·
8495G Step ATT OPT 011 5V Cable Pinout
Hi, If anyone can pls help with the cable pinout for the 8495G Step ATT OPT 011 5V. Service Manual Documentation is not clear or missleading, it doesn't show where the common Ground and +5V
By 4X6MU · #151242 ·
Re: Manuals for an HP3456B DMM?
I love that I can calibrate them with a screwdriver rather than stepping through software menus. Good luck with the GPIB programming. They predate the SCPI programming standards. John??? KK6IL
By John Kolb · #151241 ·
Re: E5052A Power On Test (3.3V Bus Supply)
Figured it out. So the LT1084 arrived from digikey. I swapped U18 and U19 on the A3; no changes in LED state or boot up error. At this point, I had also removed PSU and removed PSU daughterboard,
By Kevin A. · #151240 ·
Re: Fail over input board for the HP-5087A distribution amplifier
Ed, Count me in, that would be a nice feature for my 5087A. Ron
By Ron · #151239 ·
Re: 8594E Cal Signal not Found ?
I had an edit failure resulting in the wrong draft being sent. (Wipes egg off face)
By Ed Marciniak · #151238 ·
Re: 8594E Cal Signal not Found ?
Ed, You are incorrect on the size.? The Intel HEX format provided at KO4BB is two bytes of ASCII to be converted to one byte of binary, plus the Intel format includes some overhead for each record
By Mark Litwack · #151237 ·
Re: 8594E Cal Signal not Found ?
The files in the folder referenced are 636KB each as hex. As binary, that should be around 512KBytes each, or 4 megabits. I guess you could do the math on whether your two chips hold 8 megabits
By Ed Marciniak · #151236 ·
Re: 8594E Cal Signal not Found ?
Mark, great thanks I actually found 4 AMD AM27C020’s I will use them they state they have HP 859XE 95-09-14 on them. I kind of remember picking them up at a hamfest a few years ago and some digging
By KB2LMN · #151235 ·
Re: 8594E Cal Signal not Found ?
That is the latest firmware on KO4BB. Look at the size of the four HEX files when loaded into your programmer. ?You will need (4) 27C020-150 2Mbit (256kbyte) EEPROMs to hold them all. The firmware
By Mark Litwack · #151234 ·
Re: 8594E Cal Signal not Found ?
Well I believe I found the newest software https://www.ko4bb.com/getsimple/index.php?id=manuals&dir=01_ROM_Images_and_Drivers/HP_8590/HP_-_8590-ROM-1998/98-06-15 My question is I only have 2 EPROMS
By KB2LMN · #151233 ·
Re: Intermittent REF UNLOCK error message on 8591A Spectrum Analyzer
Hi Anders, I'm glad to hear that you were able to fix your Spectrum's 600 MHz VCXO circuit and get it working. Yves
By Yves Tardif · #151231 ·
Re: Manuals for an HP3456B DMM?
The 3456A is a very nice meter, and I think the only of its sort HP ever certified as a transfer standard. There are a couple of failures you should watch for. First, the more desirable is the
By Chuck Harris · #151230 ·