11.3.2 Touch current (direct or differential current)
The limit value is:
0.5 mA
This measurement must also be carried out on devices of
protection class I with touchable conductive parts that are not
connected to the protective conductor.
If you have selected a test procedure
without insulation resistance
in the
„Settings for measuring“ screen, the appliance tester changes to measuring
the touch current (Points 11.2. Insulation resistance and 11.3a. Touch current
/ Substitute leakage current, are omitted).
Caution! The test object is supplied with mains voltage
during the test.
After pressing the [next] button the display changes and you receive a
warning message about the connection to the mains current (Fig. 55).
With your assent – by pressing the large button – the display changes to
measuring the touch current and the mains voltage is connected
– the test object is put into operation!
You can see the measured value in the middle of the display, with the
related limit value to the right (Fig. 56).
Fig. 55
Fig. 56
35
Operating manual for the TG uni 1, TG euro 1 and TG euro 1 med appliance tester
Conducting tests in accordance with DIN VDE 0701-0702, Example 2 – Devices without a protective conductor (PC II)
f
f
f
The star sign on the left side of the display blinks when the
measuring process is running (the values are being measured).
The [OK] button appears when the measured value is determined.
The symbol
blinks to indicate the connection to the mains voltage.
With the [help] button, you can also go to the help display from here.
Pressing the [OK] button automatically
reverses the polarity
of the mains
plug of the test object (Fig. 57).
The switching pause provides time for any running motors to stop.
Thereafter, you are again warned about the connection to the mains
voltage. After confirmation by pressing the button, the mains voltage is
switched on once more and the touch current is measured again.
Selecting the measuring method for touch current – see Point 6.3,
Setting the measuring method for protective conductor current
measurement.
Fig. 57
