Huazheng HZDW-DB, User Manual

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grid C2 of the instrument respectively, and then perform the test according to the
measurement procedure.
VIII.Operating steps
7.1. Preparation before operation
1. First check whether the current line, voltage line and ground network line used for the
test are disconnected (can be measured with a multimeter), whether the rust on the
ground pile is cleaned, and whether the buried depth is appropriate (>0.5m), and check at
the same time Check whether the connection between the test line and the ground stake
is connected. If it is not connected, please reconnect after handling.
2. The length ratio of the current test line to the voltage test line is 1:0.618, and the length
of the current test line should be 3 to 5 times the diagonal of the ground network.
3. The current test line and the voltage test line are discharged in parallel after connecting
one end to the instrument according to the specified length. The other end is connected
to two ground piles (as shown in Figure 3 or Figure 4).
4. Check the placed test line again, connect one end of the multimeter to the current line
or voltage line, and the other end of the grounding network line if there is no resistance
value displayed, it is open, confirm that it is intact and test again.
5. After checking that the connection is correct, connect the AC 220V/50Hz power supply
to the instrument and power on the instrument.
6. Press the measurement key to start measurement.
7. After the instrument displays the test, record the test data (the instrument can repeat
the measurement multiple times).
8. After turning off the power of the instrument, disconnect the connection and the test
process ends.
7.2. Operation instructions:
1. Turn on the power switch and the computer will perform self-test. After a few seconds,
the LCD screen displays the main menu in Chinese as shown in Figure 5, indicating that
the self-test is successful.