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Zero Test
Specification
Electrical Characteristics
Accuracy: Zero set (Digital settability of zero)
1. This performance limit is determined by the zero set specification of the power
sensor used in the measurement plus the measurement noise. The range
calibrator has a zero set specification of
noise specification is 110 nW at 16 averages. At 512 averages a noise multiplier of
0.24 is required, giving a measurement noise specification of 0.0264 µW
(0.24x512).
Description
After the power meter is initially calibrated and zeroed, the change in the
digital readout is monitored. This test also takes drift and noise into
account, since drift, noise and zero readings cannot be separated.
Equipment
Range Calibrator .................................. HP 11683A
Power Sensor Cable ............................. HP 11730A
Test Setup
HP EPM-441A/442A Service Guide
±
0.05 µW. The calibrator measurement
Power Meter
CHANNEL A
Figure 2-1: Zero Test Setup
Performance Tests
Performance Limits
± 0.0764 µ W
1
Range
Calibrator
POWER
METER
HP 11730A
Zero Test
2-5
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