E4417A Datasheet, PDF (15/19 Pages) Keysight Technologies – Power Meters and E-Series E9320 Peak and Average Power Sensors

15 | Keysight | E4416A/E4417A EPM-P Series Power Meters and E-Series E9320 Peak and Average Power Sensors – Data Sheet
Zero Set
This specification applies to a ZERO performed when the sensor input is not connected
to the POWER REF.
Table 8. Zero set
Sensor model
E9321A, E9325A
E9322A, E9326A
E9323A, E9327A
Zero set (normal mode)
5 nW
19 nW
60 nW
Zero set (average only mode)
0.17 nW
0.5 nW
0.6 nW
Zero Drift and Measurement Noise
Table 9. Zero drift and measurement noise
Zero drift¹
Sensor model
Normal
mode
E9321A, E9325A
< ± 5 nW
E9322A, E9326A
< ± 5 nW
E9323A, E9327A
< ± 40 nW
Average
only mode
< ± 60 pW
< ± 100 pW
< ± 100 pW
Measurement noise²
Normal
mode³
Normal
mode⁴
< 6 nW
< 75 nW
< 12 nW
< 180 nW
< 25 nW
< 550 nW
Average
only mode
< 165 pW
< 330 pW
< 400 pW
Effect of averaging on noise: Averaging over 1 to 1024 readings is available for reducing
noise. Table 9 provides the measurement noise for a particular sensor. Use the noise
multipliers in Table 10, for the appropriate speed (normal or x 2) or measurement mode
(normal or average only) and the number of averages, to determine the total measurement
noise value.
In addition, for x 2 speed (in normal mode) the total measurement noise should be
multiplied by 1.2, and for fast speed (in normal mode), the multiplier is 3.4.
Note that in fast speed, no additional averaging is implemented.
Table 10. Noise multipliers
Mode
Number of averages
Average-only
Noise multiplier
(normal speed)
Noise multiplier
(x 2 speed)
Normal
Noise multiplier
(normal speed;
free run acquisition)
1
2
4
8
16
32
64
128 256 512 1024
5.5 3.89 2.75 1.94 1.0 0.85 0.61 0.49 0.34 0.24 0.17
6.5 4.6 3.25 2.3 1.63 1.0 0.72 0.57 0.41 0.29 0.2
1.0 0.94 0.88 0.82 0.76 0.70 0.64 0.58 0.52 0.46 0.40
1.  Within 1 hour after zero set, at a constant temperature, after a 24 hour warm-up of the power meter.
2.  Measured over a one-minute interval, at a constant temperature, two standard deviations, with
averaging set to 1 (for normal mode), 16 (for average only mode, normal speed) and 32 (for average
only mode, x 2 speed).
3.  In free run acquisition mode.
4.  Noise per sample, video bandwidth set to OFF with no averaging (i.e. averaging set to 1) - see the
note “Effect of Video Bandwidth Setting” and Table 11.