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The ADC is in a wide DIP (don't know the dimensions from heart, but it has the same width as an ordinary EPROM).

I also googled but a minute or two. What is the housing of that ADC IS? Worst case, one can IMHO grab an SMD part and make a fourlayer adapter at the usual PCB making suspects

Hi Calvin I checked the A27 parts list. Following chips seem to be used: NE5018F DAC - can be found on eBay 1826-0881 ADC - this is actually an ADC856C. I am unsure whether this can be replaced

Hi Calvin I have the complete 8340A service manuals in paper on my desk. I try to find someone who can scan these plus size pages. My scanner at home or in the office can't do that. Unfortunately,

Hi Lex, Yes, it’s ADC fault. The instrument has Fault annunciator lit. I asked the guy to press [shift][manual], and the ADC lights are blinking the the Entry Display. The other faults that would

Hello, It depends on who you're buying from. Personally I would go for it if I knew the basic diagnostic self tests were working, the seller isn't selling a physically damaged unit and if I had the

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