Atec Agilent-N1921A - Manual (Page 3)

3
P-Series Power Meter and Sensor
Key system specifications and characteristics 1
Maximum sampling rate 100 Msamples/sec, continuous sampling
Video bandwidth ≥ 30 MHz
Single-shot bandwidth ≥ 30 MHz
Rise time and fall time ≤ 13 ns (for frequencies ≥ 500 MHz) 2 , see Figure 1
Minimum pulse width 50 ns 3
Overshoot ≤ 5 % 2
Average power measurement accuracy N1921A: ≤ ± 0.2 dB or ± 4.5 % 4
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 a range of –15 to +20 dBm, and a frequency range of 0.5 to 10 GHz, DUT Max. SWR < 1.27 for the N1921A, and a
frequency range of 0.5 to 40 GHz, DUT Max. SWR < 1.2 for the N1922A. Averaging set to 32, in Free Run mode.
Signal under test rise time (nS)
Percent error
15 20 25 30 35 40 45 50 55 60 65 70 75 80 85 90 95 100
35
30
25
20
15
10
5
0
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) 3 + (system rise time) 3 )
and the % error is:
% Error = ((measured rise time – signal under test rise time)/signal under test rise time) x 100