Agilent Technologies E4418B Service Manual page 133

Standard Uncertainty u(x
Table A-1 shows the standard deviation of the 30 readings from the DUT at various
power levels.
Power Level
u( ) 3.162uW
-25)
X(
u( ) 10uW
-20)
X(
u( ) 31.62uW
-15)
X(
u( ) 100uW
-10)
X(
u( ) 316.2uW
-5)
X(
u( ) 1mW
0)
X(
u( ) 3.16227mW
5)
X(
u( ) 10mW
10)
X(
u( 31.62277mW
5)
X(1
u( ) 100mW
20)
X(
The distributions are all normal.
3458A DMM Uncertainty:
The uncertainty of the voltage measured by the 3458A is:
Error = (ppm of reading + ppm of range) + (factory traceability) + (temperature coefficient)
Conditions: 1 Year Calibration and temperature variance +/-5°C with ACAL on dc
volts.
Reference: 3458A Operating Manual Appendix A
Factory Traceability: From 6ppm to 0.5ppm Standard Uncertainty depending on
range.
Agilent E4416A/E4417A Service Guide
Measurement Uncertainty Analysis – Instrument Accuracy Test
):
i
Table A-1: Standard Uncertainty Results
Standard Deviation of 30
Readings
0.0132dB
0.0038dB
0.0013dB
0.0015dB
0.0004dB
0.0003dB
0.0003dB
0.0003dB
0.0003dB
0.0004dB
Measurement Introduction
Conversion to Linear Units
Standard Uncertainty
0.0097uW
0.009uW
0.0095uW
0.035uW
0.03uW
0.00007mW
0.00022mW
0.000690mW
0.0022mW
0.0092mW
A-5