OPERATION
9
storing results. The main menu screen will also display “
300 MEMORY
FULL
” instead of the number of stored tests.
Data is stored for up to 10 years in battery backed
RAM
.
CURRENT Menu
There are two options,
SET
, and
LIMIT
.
Set
This option allows you to set the desired test current. Simply enter the
desired value using the numeric keys on the keyboard and press Enter. If
the current selected is greater than the limit that has been set, DLRO200
will beep, cancel your entry in the Set Current field and wait for you to
enter a valid current.
Limit
Some samples to be tested may not be able to withstand the passing of
heavy currents. In this case set a maximum level of test current to prevent
the accidental entry of an excessive test current. This level defaults to
200A. If a lower limit is required enter it using the keyboard and press
Enter. If the
LIMIT
current selected is lower than the
SET
current, the
SET
current will be reduced to the same value as the
LIMIT
.
The Main Menu screen will show the active Current Limit beneath the Set
Current.
Warning Messages
The display will, from time to time, display certain warning messages,
which may affect measurement accuracy or operator safety.
Test Circuit Continuity
A good measurement requires both the current carrying circuit and the
voltage detection circuit to be completed by the item under test. The
DLRO200 checks for this continuity after the
TEST
button has been
pressed.
Initially the Potential circuit is checked. If there is poor continuity in this
circuit a message will appear on the display stating “
POTENTIAL FAIL
”.
Press Enter to clear this message and correct the discontinuity in the P
circuit.
Press
TEST
again. If the P circuit is complete DLRO200 will attempt to
pass the test current. If the C circuit continuity is inadequate, after a little
while, DLRO200 will display the message “
CURRENT LOOP FAIL
”.
Press Enter to clear the message. Correct the fault and start the test again.
External Voltage Warning
The item being tested must be voltage free. If, at any time while DLRO200
is connected, the item being tested has a voltage in excess of 10 volts ac
peak or dc with respect to the instrument ground potential, a message
“
EXTERNAL VOLTAGE ON TERMINALS
” will appear on the display.
This is a warning that the item under test is live and might be dangerous.
A test cannot be performed in this condition.
Remove the external voltage. The display will revert to the main menu
screen.
If the voltage was detected at the start of a test you may now start the test.
If the voltage was detected during or at the end of a test, the results will
be invalid, will not be stored and the test will need to be repeated after
removing the source of voltage.
Discharge Current Warning
A message
CURRENT FLOW
will appear if a current greater than
approximately 10 mA is still flowing after a test is completed. This suggests
that an inductive load has been accidentally tested and is still discharging.
Do not disconnect the current loop while the discharge warning is showing.
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