Megger LRCD200 series, Руководство пользователя

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PREPARATIONS FOR USE (ALL INSTRUMENTS) GENERAL OPERATING INSTRUCTIONS
8
Tests lock (LRCD 220 only)
The LOCK
L
indicates when the [Hi] current loop test range is locked
ON.
It is activated by holding down the
L
lock button, and pressing the
[TEST] button. When activated, the [Hi] current loop resistance
measurement will start when the instrument is connected to a voltage.
The test lock remains on for 30 seconds, after which it resets to off.
Test inhibit
The following conditions may cause the instrument to inhibit testing:
Out of range supply voltage
If an out of range voltage or frequency exists on the circuit under test,
or on a very noisy mains supply, testing will be automatically inhibited.
The RCD tests requires a minimum supply voltage to operate.
If the warning <***V is displayed, the supply voltage is below that
required to perform an RCD test.
*** = supply voltage indication.
Overheating
Repetitive loop testing generates heat within the instrument. If this
heat becomes excessive the instrument will warn the operator and
prevent further testing until the instrument has had a chance to cool
down.
Fuse Blown
A fuse blown will prevent the instrument from making further tests.
The fuse indicator will be displayed.
Batteries
The Megger LRCD series instruments are supplied with batteries fitted.
When batteries become exhausted, refer to page 19, battery replacement.
W Waa rrn nii n ng g:: Do not switch the instrument on with the battery cover
removed.
Preliminary test lead check
Functional verification
Before each use of the instrument visually inspect the test leads, prods
and crocodile clips to confirm that their condition is good, with no
damaged or broken insulation.