Table of Contents
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1
Specifications and Characteristics
Power Meter Supplemental Characteristics
Zero Drift of Sensors
This parameter is also called long term stability and is the change in the power
meter indication over a long time (within one hour) at a constant temperature
after a 24-hour warm-up of the power meter.
Power sensor dependent (refer to
Measurement Noise
Power sensor dependent (refer to
Averaging effects on measurement noise. Averaging over 1 to 1024 readings is
available for reducing noise.
particular power sensor with the number of averages set to 16 for normal mode
and 32 for x2 mode. Use the "Noise Multiplier" for the appropriate mode (normal
or x2) and number of averages to determine the total measurement noise value.
For example, for a Keysight 8481D power sensor in normal mode with the number
of averages set to 4, the measurement noise is equal to:
(<45 pW × 2.75) = <124 pW
Table 1-3
Number of averages
Noise multiplier
(Normal mode)
Noise multiplier
(x2 mode)
Table 1-4
Power sensor
Keysight 8481A
Keysight 8481B
Keysight 8481D
30
Table 1-4
Noise multiplier
1
2
4
5.5
3.89
2.75
6.5
4.6
3.25
Power sensor specifications
[d]
[d]
[d]
Keysight N1913B/N1914B EPM Series Power Meters Service Guide
Table
1-4).
Table 1-3
and
Table
provides the measurement noise for a
8
16
32
1.94
1.0
0.85
2.3
1.63
1.0
Zero drift
<±10 nW
<±10 mW
<±4 pW
1-4).
64
128
256
512 1024
0.61
0.49
0.34
0.24
0.72
0.57
0.41
0.29
[a]
Measurement
<110 nW
<110 mW
<45 pW
0.17
0.2
[b]
noise
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