03 | Keysight N1911A/N1912A P-Series Power Meters and N1921A/N1922A Wideband Power Sensors - Data Sheet
P-Series Power Meter and Sensor
Key System Specifications and Characteristics2
Maximum sampling rate
Video bandwidth
100 Msamples/sec, continuous sampling
≥ 30 MHz
≥ 30 MHz
Single-shot bandwidth
Rise time and fall time
Minimum pulse width
Overshoot
2
≤ 13 ns (for frequencies ≥ 500 MHz) , see Figure 1
3
50 ns
2
≤ 5 %
4
Average power measurement
accuracy
N1921A: ≤ ± 0.2 dB or ± 4.5 %
N1922A: ≤ ± 0.3 dB or ± 6.7 %
Dynamic range
–35 dBm to +20 dBm (> 500 MHz)
–30 dBm to +20 dBm (50 MHz to 500 MHz)
Maximum capture length
1 second
Maximum pulse repetition rate
10 MHz (based on 10 samples per period)
1. See Appendix A on page 9 for measurement uncertainty calculations.
2. Specification applies only when the Off video bandwidth is selected.
3. The Minimum Pulse Width is the recommended minimum pulse width viewable on the power meter, where power measurements are meaningful and
accurate, but not warranted.
4. Specification is valid over –15 to +20 dBm, and a frequency range 0.5 to 10 GHz, DUT Max. SWR < 1.27 for the N1921A, and a frequency range 0.5 to
40 GHz, DUT Max. SWR < 1.2 for the N1922A. Averaging set to 32, in Free Run mode.
35
30
25
20
15
10
5
0
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
Signal under test rise time (nS)
Figure 1. Measured rise time percentage error versus signal under test rise time
Although the rise time specification is ≤ 13 ns, this does not mean that the P-Series meter and sensor combination can
accurately measure a signal with a known rise time of 13 ns. The measured rise time is the root sum of the squares (RSS)
of the signal under test rise time and the system rise time (13 ns):
Measured rise time = √ ((signal under test rise time)2 + (system rise time)2 ),
and the % error is:
% Error = ((measured rise time – signal under test rise time)/signal under test
rise time) x 100
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