E4417A Datasheet, PDF (16/19 Pages) Keysight Technologies – Power Meters and E-Series E9320 Peak and Average Power Sensors

16 | Keysight | E4416A/E4417A EPM-P Series Power Meters and E-Series E9320 Peak and Average Power Sensors – Data Sheet
Example
E9321A power sensor, number of averages = 4, free run acquisition, normal mode, x 2 speed.
Measurement noise calculation: (< 6 nW x 0.88 x 1.2) = < 6.34 nW
Effect of video bandwidth setting
The noise per sample is reduced by applying the meter video bandwidth reduction filter
setting (High, Medium or Low). If averaging is implemented, this will dominate any effect
of changing the video bandwidth.
Table 11. Effect of video bandwidth on noise per sample
Sensor
Noise multipliers
Low
Medium
High
E9321A, E9325A
0.32
0.50
0.63
E9322A, E9326A
0.50
0.63
0.80
E9323A, E9327A
0.40
0.63
1.0
Example
E9322A power sensor, triggered acquisition, video band-width = High.
Noise per sample calculation:
(< 180 nW x 0.80) = < 144 nW
Effect of time-gating on measurement noise
The measurement noise will depend on the time gate length, over which measurements
are made. Effectively 20 averages are carried out every 1 us of gate length.
Settling Times
Average-only mode
In normal and x 2 speed, manual filter, 10 dB decreasing power step refer to Table 12.
Table 12. Settling time (average only mode)
Number of 1 2 4 8 16 32 64 128 256 512 1024
average
Settling
0.08 0.13 0.24 0.45 1.1 1.9 3.5 6.7 14 27 57
time(s) normal
Settling
time(s) x 2
0.07 0.09 0.15 0.24 0.45 1.1 1.9 3.5 6.7 14 27
In fast speed, within the range –50 to +20 dBm, for a 10 dB decreasing power step, the
settling time is 10 ms (for the E4416A) and 20 ms (for the E4417A).
When a power step crosses the power sensor’s auto-range switch point, add 25 ms.
Normal mode
In normal, free run acquisition mode, within the range –20 to +20 dBm, for a 10 dB
decreasing power step, the settling time is dominated by the measurement update rate
and is listed in Table 13 for various filter settings.