Publication 21555, Rev. E, September 2002 B-1
B
Power Sensors
B.1 Introduction
This appendix contains the selection, specifications and calibration data for power sensors used with
Giga-tronics power meters. This appendix is divided into the following major sections:
• Power Sensor Selection
• Power Sensor Calibration
B.2 Power Sensor Selection
Standard Series 803XXA Sensors measure CW signals from -70 to +20 dBm; and the Series 804XXA
Sensors measure modulated or CW signals from -67 to +20 dBm; the 58542 VXIbus Universal Power
Meter also use Peak Power Sensors for measuring radar and digital modulation signals.
Giga-tronics True RMS sensors are recommended for applications such as measuring quadrature
modulated signals, multi-tone receiver intermodulation distortion power, noise power, or the
compression power of an amplifier. These sensors include a pad to attenuate the signal to the RMS
region of the diode’s response. This corresponds to the -70 dBm to -20 dBm linear operating region of
Standard CW Sensors. The pad improves the input VSWR to <
1.15 at 18 GHz.
High Power (1, 5, 25 and 50 Watt) and Low VSWR sensors are also available for use with the power
meter.
Table B-1 lists the Giga-tronics power sensors used with the power meters. Refer to applicable notes on
page B-4. See Figures B-1 for modulation-induced measurement uncertainty.
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