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At 500mV and up, the 410C's input impedance is 100M. Barry - N4BUQ

I used to have two; both worked partially. The counter was nothing special but, connected as it was to what amounted to a 9100 programmable calculator, it could do impressive work. My two 5360s had

So I ordered some N28F010 150 Intel Flash Memory IC's from Ebay and will be attempting to replace the 1st Flash IC to see if this solves the issue. I'm assuming that the error is indicating the memory

I got one of these from a group member in the SF Bay Area years ago.? It needed a little cleaning, but worked perfectly.? However, the last time I powered it up, I noticed it wasn't behaving

AFAIR, 410c has input impedance is 1 or 2 pf, at 10 Mohm.

I don't know if this helps, but it's always a good idea to check the health of all the 100k ohm and 150k ohm 1206 packaged SMD resistors on the little plug in fan controller board if you have an

David, I found one at Apex Electronics (a surplus place in California) some years ago, and eventually found a manual as well. ?I've yet to attack it, though, and have also spent years on the lookout

That shows operating system A.03.01. The last version is (I think) A.04.01 and if you use the firmware updater it will update the OS as well as firmware if that box is checked. Not something for you

I have one, as does a local partner-in-crime, both not (yet) working. They're supposed to be pretty amazing counters in many ways, but one of HP's more complex and ambitious designs. They're very

I got the board to successfully boot on the bench. (Just the processor board, not the rest of the instrument). With my benchtop setup, I couldn't get the device to boot, but after shortening the

What happened to the 5360A counters? Not seen any for sale in the UK for years, I was warned they are very unreliable, but this doesn't put me off adding one to my collection. David

Some pictures for reference (not for sale), grounded shell versions from both Switchcraft & Tower, the bagged one is ungrounded one from Tower. I've seen them broken from being shipped with the cord

According to Tony D ‘s schematics, the ground pin in the connector was a ground connection for the electronics. One would assume that the external metal case was connected to the electronics ground.

hi, my disintegrated Old Oval receptacle in in an Hp 9100a Calculator. it is so badly corroded and disintegrated that I can not tell if it was grounded or not. The lower part of the 9100a case likely

Well, apparently I've been living right because on a Hail Mary sweep through my various virtual machines I found a snapshot from what must have been the first failed update attempt, and its backup

First off, are talking about the EPROM on the CPU board or are we talking about the EEROMs on the program memory board.? I have had some problems with the EEPROMs using Wayne's (ZL2BKC)

After 18 months I'm getting back to my E4406A. My problem was/is that a failed firmware upgrade attempt left me with no synthesizer cal coefficients -- a 0 byte EEPROM1 file in the backup created on

Hi? Morris, That's the beast! I've two, recovered from 5360A counters, one I've repurposed as a general purpose 5MHz source and a spare, which I'll pass on to you if it suits. If memory serves, two

Possibly unrelated, but I have an Agilent PNA? from about 2006.? It had a number of issues including a "non-functional" CPU board (according to Keysight).? Symptoms were similar to yours - 3 or 4

Hello, thank you very much for your information I will see what I found on ebay THANKS