Probewell MT-1/WT3 - Page 46

MT-1/WT3 User Guide
Page • 45
Electronic standard accuracy
1
Typical
±0.02%
Maximum guaranteed
±0.05%
Influence affecting accuracy
None
Multifunction measurements accuracy
RMS voltage
±0.05%, maximum
RMS current
±0.05%, maximum
Frequency
±0.01%, maximum
1
The MT-1/WT3's internal electronic standard is calibrated using a reference standard
traceable to NIST and comes with a complete calibration report certifying measurement
accuracy for both Wh and VARh scales over its entire operating range. Test accuracy can be
checked using a reference standard and the three-phase Accuracy Testing Kit (ATK-3). The
calibration of the MT-1/WT3's standard can be slightly changed using the “User Calibration”
menu. However, User Calibration offset is limited to ±0.05% (in ±0.001% increments) from
factory calibration. User Calibration is stored in the socket’s non-volatile memory. The socket
contains a unique internal number that identifies its internal electronic standard.