Calibrating Instruments
Calibrating RCD Test Functions 4
4-21
R
OUTPUT V, HIΩ, mA~
HI LO
ehq011.eps
Figure 4-13. Simplified Substitute leakage current schematic
The Calibrator does not actually measure leakage current in this mode.
The substitute leakage current is defined by the nominal power line voltage (115 or
230 V), the nominal leakage current set through Id nominal, and the output resistance of
UUT source terminal (R
OUT
). Usually the R
OUT
parameter is 2 kΩ to simulate human
body resistance. The R
OUT
parameter can be set between 0 and 5 kΩ through the setup
menu.
Note
The R
OUT
parameter significantly influences the accuracy of the substitute
leakage current calibration. Some Appliance testers are designed with
output resistance values different than 2 k
Ω
. Check the UUT’s operation
manual before performing this calibration.
To set the R
OUT
parameter:
1. Press the Setup softkey.
2. Using the cursor keys or rotary knob, highlight Leakage Current and either press
the Select softkey or press in on the rotary knob.
3. With the cursor on Substitute LC Rout press the Select softkey or press in on the
rotary knob again to set the value.
4. Using the keypad, cursor keys or rotary knob, change the value to the desired
resistance.
5. Press the Write softkey to store the new value. To exit without changing the value,
press Exit.
6. Press Exit repeatedly to return to the main screen.
Calibrating RCD Test Functions
The Calibrator’s Residual Current Device (RCD) function is used to calibrate the RCD
function of RCD testers and multifunction installation testers. The calibration process
checks the installation tester’s RCD trip current and trip time settings by emulating a
circuit breaker with adjustable trip current and trip time. The Calibrator has a trip current
range of 10 mA to 3000 mA in 1 mA steps. Its trip time range is 10 ms to 5 seconds.
Figure 4-14 shows the Calibrator’s basic configuration when performing RCD
calibration.
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