Uncertainty
Absolute Power Measurement Uncertainty
1
Table 1. Measurement Uncertainty (dB), 0 °C to 50 °C
Power Measured (dBm)
Frequency (GHz)
≤
0.05
>0.05 to 2
>2 to 8
-60 to <-16
0.14
0.14
0.14
-16 to <+4
0.14
0.14
0.13
+4 to +20
0.14
0.15
0.15
Table 2. Measurement Uncertainty (dB), 20 °C to 30 °C
Power Measured (dBm)
Frequency (GHz)
≤
0.05
>0.05 to 2
>2 to 8
-60 to <-16
0.13
0.12
0.14
-16 to <+4
0.11
0.10
0.13
+4 to +20
0.11
0.10
0.10
Relative Power Measurement Uncertainty
2
Table 3. Measurement Uncertainty (dB),
≤
0.05 GHz
Initial Power
Measured (dBm)
Final Power Measured (dBm)
0 °C to 50 °C
20 °C to 30 °C
+4 to +20 -16 to <+4 -60 to <-16 +4 to +20 -16 to <+4 -60 to <-16
-60 to <-16
0.14
0.13
0.03
0.08
0.09
0.03
-16 to <+4
0.14
0.04
0.13
0.06
0.03
0.09
+4 to +20
0.05
0.14
0.14
0.05
0.06
0.08
1
Expanded uncertainty with
k
= 2 for a CW measurement after zeroing. Includes calibration factor
and linearity; noise, zero set, and drift must be added.
2
Expanded uncertainty with
k
= 2 for measurement of a change in power of a CW signal after
zeroing. Includes calibration factor and linearity; noise, zero set, and drift must be added.
USB-5683 Specifications
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© National Instruments
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