AnsweredAssumed Answered

Measurement of multiple signals with power meter

Question asked by umar on Oct 17, 2012
Latest reply on Jun 28, 2013 by matthew_rose

Like • Show 0 Likes0
Comment • 1

Hello,

I have a very basic query. if we use 2 signal generators with output frequencies 1 GHz & 500 MHz respectively, The output of both generators is combined with resistor combiner/splitter. the output of the combiner is connected to a power meter. However the reading of the power meter is not stable. but when one signal generator is turned off, reading in the power meter becomes stable.
Why?
Is it because of the frequencies, the combiner or the power meter?
Kindly help!

No one else has this question

Outcomes

1 Reply

matthew_rose Jun 28, 2013 3:13 PM
Mark Correct
Correct Answer
Diode power sensors are characterised with pure CW signals. For signals within the detection bandwidth of the diode, fast sampling enables the signal to be considered as CW for the sampling interval. Linearity calibration factors can then be applied on a sample by sample basis to ensure accurate power measurements. The diode power conversion characteristics are linearized in this process. When there is harmonic content on the input signal it can no longer be considered as CW. An error is generated that is dependant on the average power level of the signal, the relative level of the harmonic and the harmonic number.
Like • Show 0 Likes0
Actions

Measurement of multiple signals with power meter

Outcomes

Related Content

Recommended Content