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Hmm, I think your right. The watchdog circuit appears to compare the battery voltage with the power supply voltage to see if the power on sequence has obtained sufficient voltage before applying power

Hi Tom, Thanks for the hint! So, if that is the case, what would you do to fix it?. I mean, is it a good idea to disconnect them to check?. I have no clue of how the mating is made... is there any

Christian, I just checked the firmware on a late version (prefix 3811U) 8970B, standard version (1.6 GHz) and it's Rev 02844. It's possible that this was the last revision of the firmware. Another

Oh, one other thing. I have seen this problem caused by a bad coax connection to one of the modules. They are compression fittings to the outer conductor and if over tightened, damage will

That is the electronic version, no clicks.

Hello Joe, I have uploaded one to: http://jvgavila.com/tmp/hp8657a_att.jpg Thanks! JOSE

Hi, One way to do this is to use a PLL chip, like the ADF41020, as the microwave divider. That chip has around -20dBm sensitivity at 10GHz, so you may not need an amplifier ahead of it. However,

Another problem with random sampling as applied to a sampling oscilloscope and not a storage oscilloscope is that the sampling strobe kickout can corrupt the trigger pickoff causing the display near

Steve, Jeff, and all, According to the manual, the 'New Main Controller' was installed starting at SN 2538A02954 and later. The Assembly Number, 03457-665xx, etc., is under the power transformer

I suspect it could be either. My 8657A is silent but my 8657B 'clicks' every 5 dB and has a mechanical attenuator. Do you have a picture of the attenuator? Joe

Actually, sequential sampling presents a faster and fuller display, but needs a vertical delay line to be able to see the front edge of fast steps that are widely spaced (low rep-rate). Random

David, Thanks for the clarification -- that makes more sense than what I "remembered". And 2230 sounds right. Happy New Year! Erich

Ed, That's probably right: 2230 sounds right. I had been thinking it was the 2430, but I think Victor is right, the 2430 doesn't have analog mod. We picked it over HP (harder to use, jaggy display)

Hi, the 3T77(A) uses two ramps to sample, the slow one gives the screen position, and the fast one gives the time increment AFTER the trigger event. Random sampling uses a constant internal sampling

Hi all, I wish you have a nice 2013! Well, I am working on an 8657A which has no output. So far, following Service Manual (SM) troubleshooting guidance, I have found that there is signal output from

This is one of the best demos of the use of a scope (a Tek 2232, btw) to use all the functions of the scope to examine different waveforms: <https://www.youtube.com/watch?v=h8MamgRaLsM> Very very

Christian, Just sent you the 8970B, Opt H18 firmware files by PM. Joe

Chuck, The random sampling is intentional and is done to reduce the artifacts of precisely spaced samples. I think the 3T77A was the first of Tek's attempts. I clearly remember that one of the 3

David wrote: It doesn't matter what they call it, if it can't store the whole waveform in one shot, it is a sampling scope, just as sure as the old N, 1SXX, 7SXX, etc. plugins were. The prime

Does anyone know where I can get a Tek 2232 with either the GPIB/HP-IB or RS-232 option? I don't see any with those options on ebay at the moment; were these interfaces uncommon or