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How do I measure accurately below -60dBm using U2040 X-Series Sensor?

Frequently Asked Questions (FAQs)

Summary

How do I measure accurately below -60dBm using U2040 X-Series Sensor?

Question

The measurement  power range of U2040 X series sensor is from -70 dBm. But after zeroing+ cal process, the noise floor was -60 dBm. 

How do I measure accurately below -60dBm using U2040 X-Series Sensor?

Answer

For power measurements below –50 dBm, it is recommended to perform external zeroing and turn off the RF output for better accuracy and repeatability.

The following steps are recommended for measurements after turn on the power sensor for 1.5 hours:

  1. External zeroing at test port
  2. MEAS? (to get measurement)

or

  1. External zeroing at test port
  2. INIT:CONT OFF
  3. TRIG:DEL:AUTO ON
  4. INIT; FETC? (to get measurement)

or

  1. External zeroing at test port
  2. INIT:CONT ON
  3. AVER:SDET OFF
  4. Allow (averaging count x aperture) seconds settling time delay
  5. FETC? (to get measurement)
You can use BenchVue to do external zeroing:
image

Or by SCPI command for external zeroing:
CAL:ZERO:TYPE EXT
CAL:ZERO:AUTO ONCE
 

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