1652C/1653B/1654B
Calibration Manual
10
Prospective Earth Fault Current Test (PSC/I
K
)
Computation Prospective Earth Fault Current (PEFC/I
K
) or Prospective
Short Circuit Current (PSC/I
K
) determined by dividing
measured mains voltage by measured loop (L-PE)
resistance or line (L-N) resistance, respectively.
Range 0 to 10 kA or 0 to 50 kA
(See Power-On Options earlier in this manual)
Resolution Units
I
K
<1000 A 1 A
Resolution and Units
I
K
>1000 A 0.1 kA
Accuracy Determined by accuracy of loop resistance and mains
voltage measurements.
RCD Testing
RCD Types Tested
RCD Type
[6]
Model 1652C Model 1653B Model 1654B
AC
[1]
G
[2]
√ √ √
AC S
[3]
√ √ √
A
[4]
G √ √ √
A S √ √ √
B
[5]
G √
B S √
Notes
[1] AC – Responds to ac
[2] G – General, no delay
[3] S – Time delay
[4] A – Responds to pulsed signal
[5] B – Responds to smooth dc
[6] RCD test inhibited for V >265 ac
RCD tests permitted only if the selected current, multiplied by earthing resistance, is <50 V.
Test Signals
RCD Type Test Signal Description
AC
(sinusoidal)
The waveform is a sinewave starting at zero crossing, polarity
determined by phase selection (0 ° phase starts with low to high zero
crossing, 180 ° phase starts with high to low zero crossing). The
magnitude of the test current is I
∆
n x Multiplier for all tests.
A
(half wave)
The waveform is a half wave rectified sinewave starting at zero,
polarity determined by phase selection (0 ° phase starts with low to
high zero crossing, 180 ° phase starts with high to low zero crossing).
The magnitude of the test current is 2.0 x I
∆
n (rms) x Multiplier for all
tests for I
∆
n = 0.01A. The magnitude of the test current is 1.4 x I
∆
n
(rms) x Multiplier for all tests for all other I
∆
n ratings.
B (DC) This is a smooth DC current according to EN61557-6 Annex A
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