KYORITSU 2413R - Manual (Page 7)

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Measuring Ranges and Accuracy
●AC Current
３．Specifications
● Effective Value (RMS)
Most alternating currents and voltages are expressed in effective
values, which are also referred to as RMS (Root-Mean-Square) values.
The effective value is the square root of the average of square of
alternating current or voltage values. Many clamp meters using a
conventional rectifying circuit have "RMS" scales for AC measurement.
The scales are, however, actually calibrated in terms of the effective
value of a sine wave though the clamp meter is responding to the
average value. The calibration is done with a conversion factor of 1.111
for sine wave, which is found by dividing the effective value by the
average value. These instruments are therefore in error if the input
voltage or current has some other shape than sine wave.
● CF (Crest Factor) is found by dividing the peak value by the effective value.
Examples: Sine wave: CF=1.414
Square wave with a 1: 9 duty ratio: CF=3
Ranges
200mＡ
2Ａ
20Ａ
200Ａ
1000Ａ
0∼199.9mA
CF≦3.0
0∼1.999A
CF≦3.0
0∼19.99A
CF≦3.0
0∼199.9A
CF≦3.0
0∼500A
CF≦3.0
501∼1000A
CF≦3.0
Accuracy
Frequency Range Response
50/60Hz
* only sine wave
WIDE
* Add 2% at CF≧2
±1.8％rdg±5dgt (50／60Hz)
±3.0％rdg±5dgt (40∼1kHz)
±2.0％rdg±5dgt (50／60Hz)
±3.5％rdg±5dgt (40∼1kHz)
±5.0％rdg (50／60Hz)
±2.5％rdg±5dgt
±3.0％rdg±5dgt
±5.5％rdg 10min.
Time Limit for
Measurements
Continuous