Agilent Power Sensor Calibration - Need a Calibration Procedure

Jerry Eldred

Forum Moderator
Super Moderator
#11
I would recommend going to the Agilent website and downloading the data sheets for that family of sensors.

As for linearity and how to select, I would let the frequency and power level be the main factors. You might want to get a set of data sheets for the various power sensors, and do a comparison.

Some other vendors include Rohde & Schwarz, and Anritsu, who also have families of power sensors (those are the only other brands I can bring to mind at the moment).

You might also look at the other model families at Agilent, as they have a number of newer models these days (and this is not an advertisement for Agilent). So in that light of neutrality, I would also recommend checking to see what is available from the other vendors.

Back to the 8484A sensor, my GUESS would be that the 8484A was discontinued perhaps because it's technology was supported only by the older models of power meters, and the 8481D may be a little newer (not sure though). I just downloaded the latest Agilent data sheet, and it has comparative specs on quite a lot of their sensors. You can probably do the same as well for Anritsu and Rohde & Schwarz.

If anyone knows some other current brands of RF power sensors that I can't think of, it would be educational to post them here. The only one other brand that just came to mind is Boonton (although I'm not sure they are still making them).
 
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powderblack

#12
Jerry,

I read your post thanks for the simplified version. In your post you mention that HP sensors are usually reference to 0dbm @ 50 MHz and then are relative from there to end of their frequency range but what about a HP sensor that can't go to 0dbm?

I speaking about model number 8487D which has a power range of -70dbm to -20 dbm.
Now my signal source generator only goes down to -20dbm but has a frequency range of 50 GHz which covers the frequency range of the sensor. Would i be correct to assume that i can do the cal factor checkpoints at -20dbm?
 

Jerry Eldred

Forum Moderator
Super Moderator
#13
Not sure exactly what you are asking, but I will try to answer. Even for an 8487D (I have some 8487A's, just not the D model), there should be a 30 dB attenuator and adaptor to set a 50 MHz 0 dBm reference (this is an industry standard for those sensors. For the low power range (high sensitivity) sensors that are not able to go all the way up to 0 dBm (1 mW), there should universally be that reference attenuator, HP 11708A, I believe, and an N(m) to APC2.4mm(f) adapter. You would connect your sensor to the 0 dBm reference using that adapter and attenuator and set the 0 dBm reference that way, at the specified reference calibration factor.

Then, removing the adapter and attenuator, and using the applicable calibration factors across its frequency range, the sensor should be good for power level measurements across its frequency and amplitude range.
 

Hershal

Metrologist-Auditor
Staff member
Super Moderator
#14
Dear all,

Can you tell me what is the SI unit of amplitude modulation?
Also the frequency and phase modulation as well?
I wish to know how to put them in the S.I units?
I know all the units are in Hz..hertz over Hertz cancels off leaving a relative value, true?

For the calculation of amplitude,phase and freq modulation using the 8902S system,
it is stated as 3% + 1 digit (what is the digit here- is it the noise floor,resolution or what?)

Rgds
Ruben
Ruebenn, the Derived Unit is the frequency, and frequency and therefore amplitude modulation, ultimately traces back to the SI Unit of Second. Meter may have contributions as well due to wavelength.

Hope this helps.
 
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