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[email protected]> wrote: board design. black tape and impossible to modify". happened to that product. ISTR using something similar in the early 80s. I suspect it might have been a Racal Redac CAD

"Ulf Kylenfall via groups.io" <ulf_r_k@...> writes: While working on emulating HP9000/300 i've read about "HP Engineering Graphics System", but don't know how much use it

The system I remember from the early 1980’s was SCICARD from Scientific calculations. I think they were based somewhere near Rochester, NY.

Some time ago I had a discussion with a friend over old times circuit board design. He referred to where he worked where they used to do manual design using black tape and transparent films. "The

Hello Joel, Thanks for sharing your repair. I have a question related to the battery holder. Your original BR2/3A battery had 3 pins if I am not mistaken. One on one side and two on the other

I did it ! I replaced the memory battery in my 3457A. My used 3457A was built in the late '80s and still had its original lithium battery, with a 1989 date code on it. This battery obviously needed

Hej Sven, Thanks for sharing your experience.??My only update is that I managed to obtain the needed components.? We have 3 units with this particular failure mechanism (out of roughly 10 total).?

Took me a while to figure out why 7652A gave no results, a typo for the 7562A log voltmeter, the manual lists 1855-0064 as Siliconix DN643, which is also listed under the NSN number. David

Hi all, I'm currently on the search for the Operation Manual (p/n: 04263-90000) and the Service Manual (p/n: 04263-90031) to suit the 4263A LCR Meter. I have the 4263A Users Guide (p/n: 04263-90001)

"Sven Schnelle" <svens@...> writes: Seems to be some intermittent failure on my unit. I removed the Vernier leveling module this morning, to measure levels at the

1855-0064 isn't in the master reference list or the several cross reference lists I looked at. I found a hit on one of the NSN sites which isn't always reliable but this one shows the hallmark's of

I think you will need to select R38, (~30k) section 5-45, it sets the meter zero by canceling the programming current that passes through the current sense resistor. R53,(3k) may need to be changed

"Scott Vance via groups.io" <scott_l_vance@...> writes:

Hello! My internal sd card has died and filedfox cannot boot. That's why I can 't install updates firmware from Keysight.com

Correction to my previous post: meant to say MINIMUM OUTPUT VOLTAGE after adding the 47K resistor in series with R10 is about 160V, maximum output is still about 320V. I am checking some voltages

Looking for any info on this device. Dual JFET, N-channel, TO-71 package.? I have a 7652A and both were pulled from one of the boards.? I may pull one off another unit to curve trace but thought I

For the sake of testing with correct values, I added a 47K resistor in series with the existing 50K voltage pot, and replaced R13 with 62K, but on the 12mA range without a load the meter needle still

Hello Paul, The replacement for the 432A from Keysight is called N432A. Can be used with normal sensors and also with the 478A. Make sure you get the right adapter

2N4119. A bit more investigation this morning. I have on error 10 ?A10U6 and A10U5 Pin 13 the correct 10 Volts, the drivers U16... are ok. The inputs are correct as listed in the manual. On A10U5

Actually the note left inside the power supply about R10 also mentions R13: "R10 voltage helipot should be 100K R13 ~ 62K. Replaced with 50K Heli 11/19/81 GPM". I checked the existing R13 and its a