Beha-Amprobe MT204-S Manual Del Usuario página 22

Insulation resistance measurement (R
• According to EN 60204-1, the insulation resistance between shorted
active conductors of power circuit and the earth bonding system must be
checked applying a test voltage of 500 V DC. The limit value is 1 MΩ.
• Ensure that all switches on the unit under test are closed in order to test
all it's components. For purpose of the measurement, all active
conductors (L1, L2, L3, N) must be shorted.
1) Set the measurement function selector (5) to R
2) Use the "U
500 V or adjustable 250 V...500 V.
3) For limit value setting press the "LIM" menu key (14). The limit
value can be set by using the "+" and "-" menu keys. It can be also
set directly to 1 MΩΩ by pressing the "1MΩ" menu key.
4) Connect test probes (or crocodile clips) to the unit under test.
5) Start the measurement by pressing the "START/STOP" button
6) Pilot lamp "ON" (8) indicates active measurement.
7) Read the displayed result considering the appropriate limit value.
8) Stop the measurement by pressing the "START/STOP" button
again.
R
ISO
0.05
U-
4
Figure 9: Measurement function R
1 Display of measurement function, parameters and limit value.
2 "U
ISO
adjustable 250 V...500 V
3 "LIM" menu key, for limit value setting
4 "U-" and "U+" menu keys for test voltage setting
• Due to the measurement of insulation resistance, capacitive units under
test will be charged with test voltage.
The unit under test will be discharged after finishing the measurement
via internal resistance of approx. 3 MΩ. The unit under test can retain
dangerous voltage in case of premature removal of test leads. Ensure
" menu key (14) to select the measurement voltage
ISO
L 1.00MΩ 250V
MΩ
U+ U LIM
ISO
2 3
" menu key, for selection of test voltage 500 V or
ISO
1
ISO
22
function)
position.
ISO
(7).