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I believe this device is a GPD from the AVANTEK range in the late 1970s and early 80s. See datasheet at: http://www.rf-microwave.com/en/shop/0/393-high-performances-professional-mmic/4168-GPD-401.html

Part of the IEE-488 standard was a function called “local lock out” (LLO) which does prevent local operation or even going to local (GTO), but I don’t recall that it survives a power cycle. Daun

Hi, The HP 8355X millimeter-wave source module is used with an HP 8673B/C/D signal generator and an HP 8349B amplifier to generate mm wave signals. The manual notes that the 8355X requires the signal

Hi David, I was able to review the MAR-3+ MMIC datasheet, and I believe that I may need an add-on board. I posted some pictures of the 5335A A9 board, especially in the vicinity of the U1 amplifier

From memory, doesn't this thing have a 'Hold' function key that locks out the keys, keypad and encoder knob? It hasn't got stuck in that mode somehow has it?

It should power up in local if the board is OK. You might also try just removing the GPIB card for a test. It senses what if any interface card is present on power up. I think it is most likely that

It does have GPIB. Could that happen spontaneously? Would that persist through a power cycle? I haven't been controlling this with GPIB. I have a GPIB interface, so I suppose I could try to query it

Does the instrument have GPIB option?? Front panel could be locked out by remote...-rastro

See my earlier post on this thread, but on all the instruments I listed, it was trivial - basically drop the front panel out (see your manual - but generally a few screws through the top and bottom of

The recent thread about switch cleaning morphed into a learned in-depth discussion of Isoprop alcohol (IPA) and its kin. If you search for the thread back in December entitled 'HP 8568B - Very Sick

I just powered up my 8594e to find that it's not responding to any front panel buttons, soft buttons, or the jog dial. The intensity knob works. The unit passes the self tests and starts sweeping just

Thanks Greg, The Lumex one almost certainly could be made to fit in the 141T. I've managed to get the back off mine and fitted an NE-2, but if I ever need it I'll bear that one in mind. Dan

I have had the same problem with accessing archives for this group. From my Android phone on T-Mobile. The first nationwide 4G network.

Shim stock in any size can be had from various industrial supply companies. ?Search MSC or Mcmaster-Carr for virtually any mechanical needs. From my Android phone on T-Mobile. The first nationwide 4G

I actually had the spring clip slice through the plastic housing and snip the lens off of the indicator on my 141T. I came in the lab one day and there was the front lens assembly of the indicator

An add-on board will not be needed. For a Minicircuits MAR-3+ type of MMIC amplifier, remove R2, short C3, move the old C3 to where R2 was, and install a 270 ohm resistor between +15.7 volts where R2

Thanks, great to have a link. A feeler gauge will get you a few pieces though, so in the scheme of things it's still a cheap repair. If you know a machinist he will usually have some shim stock also.

Hello-- Here's a column which I wrote a few years ago that describes the switches and replacement shim

Generally you remove the front panel circuit board and front panel, then separate the PCB and that will get you enough access to work on the buttons. Do this over a benchtop as some of the little

Thanks for the response. I'm a purist when it comes to using the original HP part, so I want to try find it if it still available. I was unable to cross-reference the 5088-7036 to any