2.6 Pre-test Check
26
For safety reasons, check the following before starting test.
START key, STOP key
For safety reasons, switch off the power and pull the electric plug from the
socket before carrying out the check.
1. Press the center of the START key and STOP key in the front panel slowly with
your finger to confirm the feel of the key clicking. Pressing the side of the key will
make it difficult to feel the click.
(The feel of the click will be easier to understand when you press the key a few
times or compare it with the STOP key.)
* Feel of the click
When you press the key slowly, you will feel an initial resistance which seems to
be preventing the key from going down further. Press the key harder and you will
feel the clicking of the key.
2. The key is working properly if you feel the click.
3. The key may be damaged if you do not feel the click.
Contact your dealer or Hioki representative.
Breaking current
Before starting the withstanding test, check whether electric current has been
shut out when the pre-set voltage is outputted.
1. Prepare a resistor with a resistance smaller than that of the calculation result
from the test-voltage value and test upper-limit test value (breaking current) that
are preset in the withstand-voltage test. When selecting the resistance, ensure
that the maximum voltage usage is higher than the test voltage and the rated
power is higher than the value which is calculated from the test voltage and
resistance values.
(Test-voltage)
÷ (Breaking current) > Resistance
(Test-voltage) < Maximum usage voltage of pre-set resistance
Square of test-voltage
÷ Resistance < Rated power of pre-set resistance
2. Set an upper-limit test value.
3. Connect the resistor that you prepared to the test lead.
4. Start the test. Confirm that the current is cut off when the preset voltage is out-
put. (i.e., make sure the instrument is in the FAIL state).
2.6 Pre-test Check
Recommended Insulation: High voltage-high insulation flat chip resistors
GS series (from KOA Corporation) or similar
products
Note the usage voltage and power.
To Next Page
Loading...
