Extech Instruments EX650 User Manual page 17

Current Measurement Considerations:
 Current measurement must be performed in the temperature range of 0~40
 When pressing the trigger, do not suddenly release it; the clamp is sensitive to magnetism,
heat, and mechanical stress and such impact will cause the reading to fluctuate briefly.
 If the reading is positive in the measurement of DC current, the direction of current is from
top to bottom (meter faceplate is the top and the meter back is the bottom).
 In order to ensure measurement accuracy, the conductor measured must be positioned in
the middle of the clamping area; otherwise additional error of reading of ±1.0% (typical) will
be generated.
 The accuracy of non‐sinusoidal waves must be adjusted as follows:
 Crest factor 1~2, accuracy increases by 3%
 Crest factor 2~2.5, accuracy increases by 5%
 Crest factor 2.5~3, accuracy increases by 7%
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