Test Modes; Normal Mode; Automatic Mode; Continuous Mode - Megger DUCTER DLRO 10X Bedienungsanleitung

Test Modes

TEST MODES
DLRO 10 has 4 test modes which are selected by repeated
presses of the Mode button. At the end of each test, DLRO 10
will display the average of the values obtained with forward and
reverse current.
DLRO 10X has 5 modes. On DLRO 10X these modes are
selected from the TEST menu using the cursor control and Enter
key. At the end of a test, DLRO 10X will show three resistance
values; that obtained with forward current, that obtained with
reverse current and the average value.

Normal mode

Normal mode makes a single measurement of the resistance of
the sample using forward and reverse current
Please note that in this mode both the current and voltage
leads must be connected across the test sample before the
Test button is pressed. To make another measurement,
ensure the test leads are connected and press the test
button.

Automatic mode

If Automatic mode is selected, your instrument will remain in a
state of readiness waiting for both the current AND voltage
measuring leads to be connected to the test piece. When this is
done, a forward and reverse current test will be started
automatically.
To make another measurement simply break contact with the test
sample and remake contact.
12
For example, if measuring joints in a long bus bar, you may leave
the current circuit connected at opposite ends of the bus bar.
Simply making contact with voltage probes across the joint(s)
you wish to measure will then activate the measurement.

Continuous mode

Continuous mode requires the connections to be made before
pressing the Test button. Your instrument will then repeat its
forward and reverse measurements and display the results
approximately every 3 seconds until contact is broken or the Test
button is pressed.

High Power mode

High Power mode allows the instrument to override the normal
250 mW power dissipation limit if necessary. The test duration is
greater, up to 1 minute, to allow for the charging and discharging
of inductive loads. In other respects the test is identical to Normal
mode

Unidirectional mode

On DLRO 10X only, this mode makes the measurement as in
Normal mode but using forward current only.
This mode speeds up measurements on samples that are known
to be free of any standing voltages or thermal emfs. However, the
accuracy of the reading may be degraded by any thermal emfs
but should not be worse than 0.2% ± 10 digits.
Since current is only applied in the forward direction, in this mode
only a single resistance value will be displayed.