G．Other Descriptions and Notes
1．The special utility of current clamp
The two current clamps of each meter could only be used on this instrument.
The current clamp should be prevented from any impact, the clamp surface must be
kept clean and could fully close for a reliable test.
2. The maintenance of current clamp
The dust on the surface of the current clamp should be removed promptly after use;
don’t use rough material or corrosive to clean the clamp, which is best to be gently wiped
clean with soft cloth and lubricants (for example: WD-40 lubricants).
3. Preheat 3 to 5 minutes before the measurement to ensure the measurement accuracy
4．The instrument should be used for secondary and low-voltage circuit detection, and
cannot be used to measure the current of high-voltage lines to prevent electric shock.
5．Three-phase four-wire system (Phase of a balanced threephase load)：
Phase
Relationship
Phase Value Phase Relationship
Phase Value
Ua-Ub 120° Ia-Ib 120°
Ub-Uc 120° Ib-Ic 120°
Uc-Ua 120° Ic-Ia 120°
6．Three-phase three-wire (Phase of a balanced threephase load)：
Phase
Relationship
Phase Value Phase Relationship
Phase Value
Uab-Ucb 300° Ia-Ic 240°
Uab-Ia 30° Ucb-Ic 330°
7．Three-phase four-wire vectogram and Three-phase three-wire
vectogram：
Three-phase four-wire vectogram Three-phase three-wire vectogram
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