Giga-tronics 8003 - Absolute Power Measurement Accuracy

Introduction
Manual 20791, Rev. C, June 2001 1-11
1.3.2.3 Absolute Power Measurement Accuracy
The absolute power measurement accuracy is determined by a number of factors including calibrator
accuracy, zero set error, noise, sensor calibration factor error, and the mismatch uncertainty between the
sensor and the device under test.
Calibrator
Provides a 50 MHz calibration signal at 51 precise levels from +20 dBm to -30 dBm to dynamically
linearize the sensors.
Frequency: 50 MHz, nominal
Settability: The 0 dBm level in the power sweep is factory set to
±
0.7% traceable
to the National Institute of Standards and Technology (formerly NBS).
Connector: Type N(f) connector, 50 ohm. (Adapters available for calibrating
sensors with other connector types).
Accuracy:
±
1.2% worst case for one year, over a temperature range of
15°C to 35°C.
VSWR: <1.05 (Return Loss >33 dB)
Instrument plus Power Sensor Linearity
Standard Sensors
CW Mode:
±
0.02 dB (
±
0.5%) over any 20 dB range from +16 to -70 dBm
±
0.02 dB + (+0 dB, -0.05 dB/dB) from +16 to +20 dBm
±
0.04 dB (
±
1.0%) from +16 to -70 dBm
Swept Mode: ±0.03 dB (±0.7%) over any 20 dB range from +16 to -70 dBm
±0.03 dB + (+0 dB, -0.05 dB/dB) from +16 to +20 dBm
±0.06 dB (±1.4%) from +16 to -70 dBm
Low VSWR Sensors: -64 to +20 dBm:Same as for Standard Sensors
+20 to +26 dBm:Same as for Standard Sensors, plus an
additional ±0.13 dB (typically)
High Power Sensors: -60 to +20 dBm:Same as for Standard Sensors
+20 to +30 dBm:Same as for Standard Sensors, plus an
additional ±0.13 dB (typically)
True RMS Sensors:
CW Mode: ±0.02 dB (±0.5%) over any 20 dB range from +20 dBm to -30 dBm
±0.04 dB (±1.0%) from +20 dBm to -30 dBm
Swept Mode: ±0.03 dB (±0.7%) over any 20 dB range from +20 dBm to -30 dBm
±0.06 dB (±1.4%) from +20 dBm to -30 dBm
Triggerable Pulse (Peak Power) Sensors
±0.13 dB (±3%) from 0 to -30 dBm
±0.13 (±0.01 dB/dB) from 0 to +20 dBm
Temperature Coefficient of Linearity
<0.3%/°C temperature change after calibration