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It's a B. Are the ROMs interchangeable? The 8970 isn't here at the moment - do you know what type the ROM ICs are? Thanks, Julian

Ok, they came through ok... It's an 8970B. Do you know if the ROMs for the A and B are interchangeable? The 8970 isn't here at the moment - Do you now what type the ROM ICs are? Julian

Ok, thanks. I'll bear that in mind... Do you know if the ROMs are interchangeable between the A and the B? Mine's an 8970B. If you swap a board from a working one for my board, the working one

wrote: LTZ1000A voltage references, like crystals, do occasionally jump. I see one report on youtube where someone had 3 or more of the Fluke volt

Like a lot of engineering problems I guess there's more to this than it might initially appear. The other cooling paradigm I can think of right now is having separate fans on items that require more

I don't think you need to give up just yet... a lot depends on what performance level you want across LF to 3GHz. If you are OK with about 20dB return loss (maybe even 25dB) at 3GHz and about 0.05dB

Two digits added to 1960, not 1962, and possibly the week number, but I have several HP instruments in which the second two digits are greater than 52. Someone must know, but I haven’t seen their

If I understand the prefix it's 2 digits added to 1962 and the week in which it was produced In which case the 3458A on ebay at $3k indicates that they made 5484 that week I have 2823A00313 and the

Thanks to all, especially Stephen Hanselman and RobertG8RPI, for offering help. Luckily, Robert had one available for me. Raymond

-- Spec is -20dBm minimum at mixer input, looks like your setup worked well. Ozan

Hi Damien, There are no schematics available that I've ever seen.? And I don't know of any analysis cards that don't have this problem to some extent.? All the analysis cards I've seen have

Nice work! That LCD looks great, and I might just have to grab some of those TO-220 sockets too. I still need to get some triax cables for my unit, and make a new foam insert for the box that holds

Before replacing anything - Check all operating voltages on the digital board. Do NOT trust the test points on the PSU. I have encountered erratic behavior caused by to high internal resistance of

I measured the delay between ports on my VNA and there is 145 degrees at 640 MHz .. I built a cable for that and it runs at 640.0047,? just +4.7KHz, well within spec? ...? (which is either +- 10

Awesome. I think the easiest next experiment would be to remove one of the doubled-up diodes in each of the two places, and check the frequency response at the upper end. Ed

And, success! With the same prescaler and bias network as used by HP, the option board works! I bought the prescaler chips from Aliexpress, they came loose in a non ESD plastic bag, s I was a bit

I've never seen any multi-channel time series analysis applied to Vref data. The plots I've seen are all of the raw seismic record level. No attempt at all to remove correlated noise and other noise

On 11/15/23 02:04, Brendan Murphy wrote: > I finally decided to go down the rabbit hole of the 3585a. Mine was giving me a trouble where it would boot up and give me a calibration error saying

I don't think there ever was a "corporate standard" about whether air pressure within an instrument should be positive or negative. The issue was largely left to R&D teams, as a function of the

Nice work, Wolfgang.