N1923A Datasheet, PDF (15/19 Pages) Keysight Technologies – Wideband Power Sensors

15 | Keysight | 8990B Peak Power Analyzer and N1923A/N1924A Wideband Power Sensors - Data Sheet
System Specifications and Characteristics (Continued)
Dynamic response - rise time, fall time, and overshoot versus video bandwidth settings
Video bandwidth setting
Parameter
Low: 5 MHz
Medium: 15 MHz High: 30 MHz
Rise time/Fall time ¹
Overshoot ²
Noise and drift ³
Sensor model
< 60 ns
Zeroing
N1923A/N1924A
No RF on input
RF present
< 25 ns
Zero set
< 500 MHz
200 nW
550 nW
< 13 ns
> 500 MHz
200 nW
200 nW
Off
< 500 MHz
< 50 ns
< 5%
Zero drift ⁴
80 nW
80 nW
Noise per sample multiplier
Video bandwidth setting
Low: 5 MHz
< 500 MHz
0.91
> 500 MHz
0.56
Medium: 15 MHz
0.74
High: 30 MHz
0.93
Noise multiplier
Average setting
< 500 MHz
> 500 MHz
1
2
4
8
16
32
64
1.00
0.75
0.55
0.40
0.35
0.30
0.25
1.00
0.73
0.52
0.37
0.28
0.21
0.17
> 500 MHz
≤ 5.5 ns
< 5%
Noise per sample Measurement noise ⁵
3 μW
3 μW
50 nW
50 nW
Off
1
1
128
256
512
1024
0.22
0.21
0.20
0.19
0.15
0.14
0.14
0.14
1.  Specified as 10 to 90% for rise time and 90 to 10% for fall time on a 0 dBm pulse.
2.  Specified as the overshoot relative to the settled pulse top power.
3.  In triggered mode with timebase setting at 4 msec/div.
4.  Within 1 hour after a zero, at a constant temperature, after 24 hours warm-up of the peak power analyzer. This component can be disregarded with Auto-
zero mode set to ON.
5.  Measured over a one-minute interval, at a constant temperature, two standard deviations, with averaging set to 1.
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 noise
The measurement noise on a time-gated measurement will depend on the time gate
length. 100 averages are carried out every 1 µs 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.