I saw that in the old documents H76 was considered the Lab Standard but today, Keysight is showing both H76 and H83 as Lab Standards.
Yes, the H76 and H83 should be normally sent to NIST or PTB or depending on the country to the National Metrology Institute to have it calibrated against their microcalorimeter (if they have one).
I read different white papers/articles about RF power calibration and from time to time National Metrology Institutes use a thermistor transfer standard that they ship it between them to test their own capability since they recognize each other's calibration certificates they should also have very close if not identical capabilities/standards.
Maybe you can check with your local Metrology Institute what primary standard they have for RF power calibration and if they can calibrate the 478A-H72 for you.
I tried to find the prices for RF power calibration from PTB in Germany but I was not able to find out how much it costs to have a thermistor based sensor calibrated.
If anyone in Germany knows the PTB prices I am interested.
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On 24/04/2025 22:23, Paul Bicknell via groups.io wrote:
hi the sensor without a cal table is a 478A? OPT? H72? so i have to check it against a calibrated H series sensor
? I can only assume the H76 is calibrated against a primary stranded and the rest are calibrated against a secondary stranded
I have a 6 Ghz VNA? at the lab i have set up for a friend in Cornwall so might check it out there
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