User manual

PQM-702, PQM-703 Operating Manual
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 length of clamp cables: 1.5 m
 operating temperature: 0C…+50C
 relative humidity: 85% (non-condensing)
 electromagnetic compatibility: IEC 61326
7.2.5 F-1, F-2, F-3 current clamps
F-1, F-2 and F-3 flexible clamps (Rogowski coil) are used to measure the alternating current of
frequencies up to 10 kHz in the 1 A…3000 A range.
The only difference between the F-1, F-2 and F-3 flexible clamps is the coil size. The electrical
parameters are identical.
The output signal if voltage proportional to the derivative of the measured current, with the sen-
sitivity equal to 38.83 mV/1000 A for 50 Hz and 46.6 mV/1000 A for 60 Hz.
Fig. 48. F-1 clamp
Fig. 49. F-2 clamp
Fig. 50. F-3 clamp
The output signal is supplied by a 2-meter lead with a pin adapted for the socket in the meter.
The arrow located on the closing unit indicates the current flow direction. It is assumed that the
current is flowing in the positive direction if it is flowing from the source to the receiver. Such clamp
orientation is required for a correct power measurement.
Warning
Do not use the device on non-insulated conductors with a poten-
tial of more than 1000 V in relation to the earth and a measure-
ment category greater than III.
 Reference conditions
 Temperature: +18…+22°C
 Conductor position: centered in relation to the clamp loop
 Continuous magnetic field: earth field (<40 A/m)
 Alternating magnetic field: none
 External electric field: none
 Technical specification
 Rated measuring range: 1 A…3000 A (±10000A peak for 50 Hz)
 Input/output ratio: 38.83 mV/1000 A (50 Hz)
46.6 mV/1000 A (60 Hz)
 Basic uncertainty: ±1% in the 1 A…3000 A range