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Besides NDAC, is DAV and NRFD behaving properly?? What is the value of ATN at the time the other two bytes are transferred?? And what are the values of those two bytes? If ATN is asserted, the

I have also seen 'sockets' that slip over the BNC connector, and have slots that engage the locking posts on the BNC connector. (Those than engage, and hold on the female connector) You are supposed

Triflow is good, also Kroil Instrument oil, (similar to clock oil -- non gumming).

Nice pictures. I have one of these beasts too, so am always interested in info about the guts. Mine all works fine so I never needed to dig in except for pulling the cover to admire the

Hello All, I thought I'd share some pictures from my teardown of the HP4342A Q-Meter purchased from eBay. I wasn't planning on opening it up, however the knobs were impossible to turn so I had no

I anyone is interested, I have a bunch I would sell - contact me off line with HPIB in the title Cheers! Bruce

hi n4ua, is this still available?

Hello, I've managed to snag an HP42851A Precision Q Adapter and the required HP4285A Precision LCR Meter (with option 002) on eBay. Unfortunately, the HP42851A seems to have an EEPROM failure. With

The command is hanging at the first byte of the actual command. The meter never issues the NDAC pulse for it. The meter does issue the NDAC pulses for the first 3 bytes transferred, so I know the bus

The docs show the commands in upper case, so that is what I have been using for both meters. BobH

I can't see any problems with the sweep in linear mode, Jeff. Although having said that, there's a DC ramp generator at the front end which is sending garbage to the VTO which generates 5-30Mhz from a

Sounds like a problem I fixed on the one I have- no sweep. I assume you could put a length of line in S21 mode and see the dot rotate as you change frequency manually? The sweep generator in mine had

Gentlemen, About 25 years ago, I acquired an ancient HP8754A VNA plus S parameter test set cheap due to a fault which I subsequently fixed. It's been in mothballs since then, but I pulled it out the

Just a thought... Perhaps the two meters are running different versions of firmware and one is being sensitive to upper/lower case?? My 3456A only accepts upper case. -mark

Then the switch is working.? In Talk only mode, the meter *will not* respond to a controller. The configuration of the meter in talk only mode is the meter directly wired to a printer (which is in

There is a front panel LED for Talk and when I flip the switch to Talk Only, the LED comes on. In Talk Only mode, the meter does not even respond to attempts to talk to it, I get an immediate No

Yes those are the horizontal and vertical deflection connectors.? That is a good thing to check. I have an 853A with 8558B that I've been meaning to get into restoring.? As far as I can tell the

hmmm, in talker only, I think the meter takes a measurement as commanded, and puts it out on the bus.? I don't think it would accept commands in that mode.? Talker only mode is designed to have the

Nice find! I'm quite fond of those displays. I see the eBay listing so there are a few more pictures; however, I don't find any documentation, pictures, videos, etc., on the web. Is there anything

TRANSISTOR NPN SI TO-39 PD=IW FT=800 MHZ. 28480. 18540567. Q2. 1854·0567 A guess at a cross 2N3688, NTE311 or ECG311, 2N2218, maybe 2N5109 need to check pin configuration and voltages... Jim