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Hi all, I made some further progress. I discarded my previous prototype and made a new one using better JFETs, this time the 2N4856A. According to its datasheet it is especially designed for chopper

Steffan... Maybe I missed you saying so, but with the Keysight IOLibraries installed the 82357A/B should be essentially transparent to you. Connection Expert will let you assign it a name such as

Thermocouple detectors are definitely more linear, RMS, and have been around very long time. Some of the peak power meters use the diode versions. These typically have lower dynamic range. The HP8900D

A long time ago, I remember an eBay seller offering NOS HP replacement thermocouples, with calibration labels, at incredibly low starting bid prices.? I really don't think he knew what he was

Update I figured out a way to make the 8642B stop reporting A6 counter fault in FM mode when I go from internal to external dc. I turn on AM modulation and set it to internal then turn on FM and

wrote: "parkertest" on ebay seem to have bought a lot of replacement thermocouples and are selling them at $7200 obo for 20! They will also repair an 8481A for $465 or sell a refurbished one for

Hi Jeremy, Thanks for your suggestions. I've searched without success so far. Can't find a non-working 606B at this time. I'll keep monitoring. Hi Kim, Thank you for the offer of the unit. I'd be most

A local friend and I have done a lot of work on exactly that. The idea has great potential, but there are some dragons hiding. -Dave -- Dave McGuire, AK4HZ New Kensington, PA

I’ve long thought about using one of the Linear Tech or Analog Device RF sensor ICs as a front end to an HP power sensor head with blown thermistor/diode. They have a great frequency and

Hello, Short update. Just recalling I had an Arduino setup for GPIB-USB (many thanks to Emanuele Girlando!). It works using that one to do a ++read and get a response, but then I don't seem to be

Mike almost all of the 848x series power sensor heads use a thermocouple and not a diode. The replacement thermocouples were at one time available? directly from HP/Agilent. They were crazy

I've been following this discussion about diode power sensors. I assume the diode sensors fail because of blown diodes form overload. Has any repaired the faulty sensors by replacing diodes? Mike

Hello, Thanks for the suggestions. I tried to figure out how to do low-level communication, but don't seem to find any way.? I hope I'm just missing something trivial here. If anyone has an example

https://de.farnell.com/lumberg/kv-120/din-buchse-gerade-12-pin/dp/1243258?MER=bn_level5_5NP_EngagementRecSingleItem_1 https://de.farnell.com/lumberg/sv120/stecker-din-gerade-12-pin/dp/1321484?MER=bn_

So I tried a quick test on my test cable and when put in the smith chart mode it functions in a similar manner to a Cartesian phase plot where the data is displayed from -180 degrees to +180 degrees,

And if you're into Linux, there is a GPIB driver package available with bindings for python and perl. It's at https://linux-gpib.sourceforge.io/ and supports USB adapters as well as older

Staffan, Have a look at python https://pyvisa.readthedocs.io/en/stable/rvalues.html I am from the generation that used to use FORTRAN IV and punchcards but you have to move up with times at some

Hi Dave. The machine does actually have quite a bit of capability and I find it vastly superior to the older HP VNA's I have had in the past.? The problem is it is so poorly documented or not

Hello, I can control the instrument so I guess termination is correct, but reading isn't working. I'd really like to do the low level byte by byte communication, but anyone knows hos to do this with

You could save the data as a Touchstone file the import it into the software used for the VNWA. https://www.sdr-kits.net/DG8SAQ-VNWA-software-documentation-user-guide and display as "c. phase" which