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Hi, Following the comments by G Edmonds in this thread he recommended loading the PSU -40V rail more heavily to resolve the PSU shutdown error occurring immediately after start-up. Pleased to say that

They certainly can be, and certainly are, used as transfer standards. Further, NIST will calibrate them. (they won't calibrate any other type of RF power sensor, unless something has changed very

i wouldnt call it a transfer standard , weinschel/tegam makes sensors that use the same principle that are heated (1109/1111)? that are used with system 2 units to calibrate sensors , they are

first of you have to consider that the 8478B just as the older 478 series requires a lot of manual assembly steps as it was designed in a time when there was no such thing as surface mount parts or

It is directed at a captive audience. This piece is used as the transfer standard for making power measurement calibrations and is required for certain procedures. If you want to play in a certain

Hello, There is one more issue to consider. Long lines give delays. Once I wanted to measure the loss of a coaxial cable on a vna. Was an interesting experience: no response. Until I realized the

Dan - Excellent ob - maybe you should publish the Gerber Files for the new motherboard ? Cheers! Bruce Quoting "Daniel Nelson via groups.io" <djn@...>:

OMG, who would have thought......................

For those of you who possess the older (hopefully working and accurate) 478A coaxial thermistor mount it might come as a surprise that the price of the present replacement – the Keysight 8478B mount

Tony: I also replaced the power supply with a group of Meanwell Supplies. Wrote it up. In the files section under: HP 8662A_8663A Pwr Supply Changeout.pdf (

One thing to consider is that RG213 is not phase stable so if you flex the cable after calibration it may affect your measurement Sent: Thursday, May 26, 2022 1:10 PM To:

Hi Karin, "Upper limit" is not as hard a cliff as your question presupposes. Whether or not a given length of cable is too much depends on your acceptance criteria. What are you trying to measure, and

You mention port extensions but then in the post you refer to calibration , I just want to point out that those are different things ! When you do a calibration on a VNA you move the reference plane

The problem is finding a HEMT in SOT89 with 27dBm , used to those parts were made as driver or pre-driver for Power amps but this is all done with MMIC now , I remember seeing a GaN HEMT made by MACOM

Hello Group: I have an 8753C and am wondering what the upper limit on cable length would be if I place the cal standards at the end of a cable to do remote measurement of S11.?? In other words I am

Hello Kalle and Bob I worked out a method of adjusting a bad RYTHM tower. That works for the HP8563E and for the E4407. They share the tower as far as I know. Problem is the E4407 cannot be calibrated

Hello Lothar It is a Fet. I does have a biasing system where is measures to drop over the Drain supply and then give bias to the Gate. The circuit does include matching network. I added a SHF-0189 in

I'll check those older versions out. Do you know if they are full working versions, or still subject to requiring a valid license key? Re. the 30 day limitation, I wonder if doing the old trick of

Hello, everyone! I've got the defective frequency counter N53230A (option 115 15 GHz). I've realised that inner IC and resistance are burned. I guess, due to level of input signal was too high. Does

HI all, Slightly off topic, has anyone ever seen or has the HP 200LX Palmtop service manual or schematics? I have one on the bench that I'd like to try to fix, it has some motherboard issue. Thanks!