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I Measured: The Diameter of the pin itself to be 40 Thousands of an inch which is very close to ONE mm. This corresponds to the ID of the O Ring The OD is twice that so the Cross Section is .5 mm..?

I used these o-rings from 'The O-Ring Store' on the attenuator from the 8595E (a 33321 attenuator I

Do these look

McMaster-Carr is also my normal go-to for quality O-rings. I checked there, but they don't go as small as the 1 mm ID/2 mm OD that others called out. Buna-N is certainly the best choice of

The 400H is just the higher precision version of the HP 400 family, which had a VERY long history with HP, probably over 30 years, so there are lots of versions, usually differentiated by changes in

To avoid trampling over another group bandwidth i suggest you as this on the Marconi group.io pages for this question. And definatly off brand topic, has anyone any details/specs on a Marconi TM9701

I have a 3852A with firmware 3.0 and wanted to use a card that requires firmware 4.2 . I found the instructions and firmware 4.22. I identified my board as 66503 revA? per PCB . Per instructions I

PAI had a minimum order of 100, but when I went up to 500 they started to seem really worth it.? The worst thing about doing a bulk buy was having to count out all those little bags of 50 :^)? I've

I asked Precision for a quote, I guess we will see Monday. Wally

Many thanks David, somehow i missed that in my search. Regards Pete

Since you're okay on the 1mV to 300mV ranges and the trouble starts when you advance to the 1V range, I'm staring at your x1000 range attenuator. Look for an open there. What's your serial number?

Hi Ed, Both 53132A do not count if there is no signal at their CH3 input. I bought these 2 PCBs on eBay, I think they are clones. For 12.4GHz option, the board is identical to this

I think precision associates wanted somewhere between 30 and 40 cents each but I don’t recall the minimum order quantity. About a year ago, they were around 1/3 of the price of apple rubber (NY).

Interesting idea, Adrian. I've used Amazon as source of o-rings when I repaired my 8657B. But to your pertinent point, I think I'd go McMaster-Carr or similar

I have the latest version of my PCB's ready to build. I added a trimpot for the bias on the prescaler chip to do away with the need for selecting a resistor, which is accessible through a convenient

Since the problem appears to be a residual reading at the lowest ranges and the grid of V2 helps, you might want to rule out spurious noise getting to V2. Multi MHz oscillation in the V1 stage comes

Have a look for the 400D & 400L on here too, they are almost identical to the 400H. Looking at the manual, it lists a number of paper capacitors, these will almost certainly be leaky, some are grid

Greetings to the Group: I may have botched the search function, as I can't find any actual discussions of repairs to this instrument.?? If so, I apologize for taking up the bandwidth. However, I

The HP 8900B manual with circuits diagrams is available from BAMA; https://bama.edebris.com/manuals/hp/8900b/ David

The CPU board slides out from the back. The ram slot is available through a cutout on the CPU board. The CPU is a 68000 and HP made only 256k and 1M cards for these while other vendors made 2M and 4M