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Fault could be either the ADC chip or the signals controlling it. I believe the 8340 permits direct control of the peripheral boards. Diagnostic procedure would be to measure value at ADC input and

Hi there, I am looking into buying a 8340A with known problem — Fault light on, fault code ADC. From the service manual, it says ADC fault indicates CPU detected ADC circuit problem on A27 level

John I could use a parts unit. What sort of compensation do you need? Dennis --------------------------------------------

Anyone want it? Parts of it? No oven crystal in there, no 1.2GHz input C.

Not mentioned in this catalog, but there are contentlists for the individual parts. JimMc

Jim, Any mention of a T-200/500? That’s what I have here. Thanks, Steve WB0DBS

I have a 1991 OS catalog here, and there is a toolingsection.? T-250 is listed as SSMA-(OSSM), T-450A is TNC.T-400 is for Type N. I have never been fortunate enough to find a T-200 in goodshape in

Hi everyone, I'm restoring a 1740A back to health again and its up and running but some form of calibration is now required. I have a Heathkit IG 4505 calibrator and the volts / div is pretty

Hi Tony wow, cool, thanks. These files should work for the 8341A as well I think. I will give it a try ;-) Since I cannot run HP Basic stuff, I will translate the programs to Python which runs nicely

I have the one for the 8340B if that helps. Original files here: https://1drv.ms/f/s!Amqar8_XQ9UzkKVReIlocjFDGipQfw https://1drv.ms/f/s!Amqar8_XQ9UzkKVReIlocjFDGipQfw Unlocked files

Hi, I saw that there was an automated test program which calibrates the attenuator and the ALC using HPIB commands. However, I didn't find that program on the net. Does anyone have a copy of

My counter counts reliably up to 20 GHz. I could not yet test higher frequencies. I wonder whether somebody has a ROM dump of it? It would be nice if I could add the DAC option, but this requires a

Hi? Keith;...... Thanks for the reply... My scope the HP 1701, has three (3) knobs on the shafts that control 'Main TIME/DEV, Delay TIME/Dev, and Sweep Select'.? I beleive they were used on

The failed cap has an ESR of 56.32k and slowly dropping. The capacitance is 48.78nF and rising. This was measured with an Agilent 1733C. I have an HP bench unit down in the lab so I'll walk down

Dave, Bullseye, I took the 3 pin socket of the transistor and gave it a squirt of contact cleaner in the socket tubes and then plugged it back on and repeated the unplugging and replugging a few

The one that you found is marked with a HP part number and was made in 1986. If you have an ESR meter, I would be interested in knowing the capacitance, ESR and leakage of the failed part. You might

Thanks Steve. I also have found the Tyco instruction sheets that show the use of the tooling. They also reference the M/A-Com and Omni-Spectra part numbers for the various tools. However, the

Yes, looks like it. They only come in a few sizes and bolt patterns. I found the actual part in the UK on ebay. It is a Mepco/Centralab 0180-0452 as in:

Does this look like the part? https://www.ebay.com/i/362119563587?chn=ps&dispItem=1 The price seems reasonable. Glenn --

No, the bias on Q2 is correct if 120v is good. The 16.8v base voltage reverse biases the b-e junction of Q2 turning it OFF. The 7.27v b-e bias on Q1 HV OSC is problematic. This shoud be no more