Chapter 8
High Accuracy Power Meter
Introduction
The S33XD Site Master with Option 19 and sensor PSN50 can be used to make High Accu
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racy Power Measurements from 50 MHz to 6 GHz. This high performance sensor provides
true RMS measurements from –30 to +20 dBm providing accurate measurements for both
CW and complex digitally modulated signals.
The display shows the power values in both dBm and Watts. The Relative Power feature
displays power changes with respect to a reference value in both dB and %.
Limits can be used to determine if a measurement is within specified limits, and running av
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eraging is available along with Max/Hold and Run/Hold.
The Option 19 High Accuracy Power Meter connects to the PSN50 High Accuracy Power
Sensor using an RS232 cable (Anritsu part number 800-441). A 9-18 VDC (<100 mA)
power supply is needed to power the sensor. Anritsu power supply (40-168), supplied with
the Site Master, is recommended.
The zero feature improves accuracy between –20 and –30 dBm by removing measured sys
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tem noise. Cal Factors correct both efficiency and mismatch loss. The frequency informa
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tion must be entered to obtain the correct calibration factor.
When necessary, attenuators should be used to ensure that the power does not exceed the
specified measurement range. The Offset dB feature can be used to enter the value of any
cables and attenuators. It is possible to measure the loss of a cable or attenuator, up to 3
GHz, using Option 21 (Transmission Measurement) or the Offset Cal Kit, 65701 (S331D
with Option 29 and S332D). See page 6-2 for more details on Offset Calibration.
8-1
Figure 8-1. High Accuracy Power Measurement Display
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