Appendix
82 U2000 Series Operating and Service Guide
Appendix A: Zero Set, Zero Drift, and Measurement Noise
The following specifications in Table A- 1 are only applicable to the U2000
Series USB power sensors with the serial prefix as shown below:
Tab le A-1 Zero Set, Zero Drift, and Measurement Noise for Average only Mode
Model Serial Prefix
U2000A Serial Prefix MY470/SG470 and below
U2001A Serial Prefix MY471/SG471 and below
U2002A Serial Prefix MY472/SG472 and below
U2004A Serial Prefix MY474/SG474 and below
Range
1
1 Condition: (i) 0 °C to 55 °C and (ii) 40 °C, 95% relative humidity.
Zero Set Zero Drift
2
2 Within one hour after zero set, at a constant temperature, after 24-hour warm-up
of the power sensor.
Measurement
Noise
3
3 The number of averages at 16 for Normal speed, measured over one minute
interval and two standard deviations.
–60 dBm to –35 dBm ±651 pW 996 pW 1.91 nW
–38 dBm to –15 dBm ±1.13 nW 400 pW 2.24 nW
–20 dBm to –9 dBm ±12.8 nW 6.01 nW 40.8 nW
–11 dBm to –5 dBm ±445 nW 155 nW 1.63 µW
–7 dBm to 15 dBm ±4.26 µW 3.20 µW 861 nW
10 dBm to 20 dBm ±6.84 µW 3.39 µW 19.5 µW
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