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Author Topic: thermistor mount calibration  (Read 312 times)

Offline radhiabouras

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thermistor mount calibration
« on: 11-09-2017 -- 17:55:53 »
Can a Tegam 1830A power meter be used to calibrate thermistor mounts.

Offline briansalomon

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Re: thermistor mount calibration
« Reply #1 on: 11-10-2017 -- 14:53:38 »
No. Power meters are used with thermistor mounts and other power sensors to measure RF power and are not capable of verifying the performance of a power sensor.

Because it functions without a referncing 1mW source like other power sensors the 478A is typically used to verify the 1mW reference output of power meters.

This means that in most labs the 478A represents a large part of the traceability for all absoloute power measurements.

I wouldn't send that instrument anywhere but Keysight.

Offline kuroi1185

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Re: thermistor mount calibration
« Reply #2 on: 11-16-2017 -- 04:45:15 »
Yes. You can use the Tegam 1830A in 432 Compatible mode to calibrate thermistor mounts. I think that there is some more information about this on Tegam's website or in the 1830A's manual that can be found with a simple search. 

Offline briansalomon

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Re: thermistor mount calibration
« Reply #3 on: 11-16-2017 -- 16:06:46 »
Not to put too fine a point on it.....

Here is a lick to the 1803A calibration/service manual  https://www.tegam.com/wp-content/uploads/2015/10/1830A-Manual-Rev-L.pdf

If you look on page 5-1 it shows that this manual deals with "calibration of the 1830A" and makes no mention of calibrating a thermistor mount. If we are in doubt, Tegam customer service will be able to clarify.

Offline CalibratorJ

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Re: thermistor mount calibration
« Reply #4 on: 11-20-2017 -- 15:26:59 »
An 1830A can be used in the calibration of a thermistor mount. It has to be connected to a meter to function.

Is it the standard? No.

I would personally advise to use the same type of meter that the customer is using the thermistor mount on in the calibration of the mount. If a customer uses an 1830A, the lab performing the cal should as well, likewise for a 432A or the N432A (or whatever Keysight is calling it), same if the customer is using it with a Tegam bridge or a Type IV power meter. The differences are minimal, but they are there - trust me, we have looked at it in great detail recently.

And there are labs out there that are capable of calibrating thermistor mounts, even 478A Option H75s, other than the OEMs (Keysight and Tegam, to name the big(ger) 2). Doesn't mean you should send it to all, or even many, of the companies that "claim" to be able to calibrate them without scrutinizing their uncertainties, but they do exist.

 


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