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Re: Tricks and thoughts about the 3457A battery
"Joel Setton via groups.io" <setton@...> writes: Using an FRAM might be a possible solution. A quick search showed that there's a FM1608B vom Cypress - 8Kx8 and available in DI
By Sven Schnelle · #151123 ·
Re: Looking for documentation on 4263A LCR meter
Hi Jared, I had a check - no info on this instrument Peter
By Peter Brown · #151122 ·
Re: Tricks and thoughts about the 3457A battery
Hello Razvan, You are right, the original battery has 1 pin on the (-) end, and two pins on the (+) end. However, I found that the PC board has three plated holes on the (+) side including one in the
By Joel Setton · #151121 ·
Re: Tricks and thoughts about the 3457A battery
Hello Martin, The EPROM idea is interesting, I have explored it but I don't think it could work. The main issue is that the 8Kbyte RAM chip which holds the calibration data (TC5564APL-15) is also
By Joel Setton · #151120 ·
Re: Tricks and thoughts about the 3457A battery
Congrats!! Ing. Patricio A. Greco Taller Aeronáutico de Reparación 1B-349 Organización de Mantenimiento Aeronáutico de la Defensa OMAD-001 Gral. Martín Rodríguez 2159 San Miguel
By Patricio A. Greco · #151119 ·
Re: Tricks and thoughts about the 3457A battery
Hi Joel, Since you're able to read out the contents of the RAM, would it be possible to write it to an EPROM and swap it? I never use the save and recall commands... could this work or will it refuse
By Martin · #151118 ·
Re: PCB CAD used and/or sold by HP ?
Back in the 80s, Mentor Graphics' CAD tools ran on HP-UX workstations. Perhaps that is to what he was referring. DaveD KC0WJN [email protected]> wrote:
By Dave Daniel · #151117 ·
Re: PCB CAD used and/or sold by HP ?
[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
By Tom Gardner · #151116 ·
Re: PCB CAD used and/or sold by HP ?
"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
By Sven Schnelle · #151115 ·
Re: PCB CAD used and/or sold by HP ?
The system I remember from the early 1980’s was SCICARD from Scientific calculations. I think they were based somewhere near Rochester, NY.
By Steve Byan · #151114 ·
PCB CAD used and/or sold by HP ?
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
By Ulf Kylenfall · #151113 ·
Re: Tricks and thoughts about the 3457A battery
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
By Razvan Popescu · #151112 ·
Tricks and thoughts about the 3457A battery
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
By Joel Setton · #151111 ·
Re: Agilent E5071C Low power both ports, Vernier Leveler E5071-62083, Component IGC1-4213 replacement
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).?
By Scott Vance · #151110 ·
Re: PN 1855-0064
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
By factory · #151109 ·
Looking for documentation on 4263A LCR meter
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)
By Jared Cabot · #151108 ·
Re: Agilent E5071C Low power both ports, Vernier Leveler E5071-62083, Component IGC1-4213 replacement
"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
By Sven Schnelle · #151107 ·
Re: PN 1855-0064
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
By Tom Haynes · #151106 ·
Re: HP6209B component location layout
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
By Hugh Gilbert · #151105 ·
Re: Agilent E5071C Low power both ports, Vernier Leveler E5071-62083, Component IGC1-4213 replacement
"Scott Vance via groups.io" <scott_l_vance@...> writes:
By Sven Schnelle · #151104 ·