Specifications 1
Keysight N8262A Service Guide 39
Noise and drift
Effect of video bandwidth setting
The noise per sample is reduced by applying the meter video bandwidth filter
setting (High, Medium, or Low). If averaging is implemented, this will dominate
any effect of changing the video bandwidth.
Effect of time-gating on measurement
The measurement noise on a time-gated measurement will depend on the time
gate length. 100 averages are carried out every 1 s of gate length.
The Noise per Sample contribution in this mode can approximately be reduced by
(gate length/ 10 ns) to a limit of 50 nW.
Sensor model Zeroing
Zero set
Zero drift
[a]
Noise per
sample
Measurement
noise (free
run)
[b]
<500 MHz >500 MHz
N1921A/
N1922A
No RF on input 200 nW 200 nW
100 nW 2 W 50 nW
RF present 550 nW 200 nW
[a] Within 1 hour after a zero, at a constant temperature, after 24 hour warm up of the power meter. This component can be disregarded with
Auto zero mode set to ON.
[b] Measured over a one minute interval, at a constant temperature, two standard deviations, with averaging set to 1.
Measurement average setting 1 2 4 8 16 32 64 128 256 512 1024
Free run noise multiplier 1 0.9 0.8 0.7 0.6 0.5 0.45 0.4 0.3 0.25 0.2
Video BW setting
Low
5 MHz
Medium
15 MHz
High
30 MHz
Off
Noise per sample multiplier
<500 MHz 0.5 1 2 1
>500 MHz 0.45 0.75 1.1 1
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