10 | Keysight | M9381A PXIe Vector Signal Generator – Data Sheet
Technical Specifications and Characteristics
Amplitude (continued)
Absolute level accuracy (ALC off, relative to ALC on) 12
1 MHz to 5 GHz
> 5 to 6 GHz
Power search 13
Time
± 0.25 dB, typical
± 0.62 dB, typical
< 20 ms, nominal
Absolute level accuracy in digital I/Q mode (ALC on, relative to CW) 14
≤ 15 dBm
≤ 10 dBm
≤ 0 dBm
± 0.7 dB (± 0.25 dB, nominal)
± 0.2 dB
± 0.1 dB
Amplitude Repeatability +10 dBm ALC On
0.05
0.04
0.03
0.02
0.01
0
850 MHz
1900 MHz
2200 MHz
3500 MHz
5800 MHz
-0.01
-0.02
-0.03
-0.04
-0.05
0
20
40
60
80
100
120
Elapsed Time (minutes)
Figure 8. Amplitude repeatability at various carrier frequencies. Repeatability measures the ability of the
instrument to return to a given power setting after a random excursion to any other frequency and power setting.
It should not be confused with absolute level accuracy.
Relative Level Accuracy
CW mode, ALC On
0.6
0.85 GHz
1.8 GHz
2 GHz
0.4
2.2 GHz
3.5 GHz
5.8 GHz
0.2
0
-0.2
-0.4
-0.6
12. After a power search, with a single side-band
signal and with power search blanking on.
13. Power search is an internal alignment routine
that improves level accuracy with ALC off.
-120
-100
-80
-60
-40
-20
0
20
14. QPSK waveform 4 MSa/s symbol rate.
Specifications apply within the controlled
temperature range.
Power Level (dBm)
Figure 9. Relative level accuracy at various carrier frequencies.
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