Chauvin Arnoux 2126.54, User Manual

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18
Megohmmeter Models 6528/6529
4. The threshold percentage can be set from 0.1% to
399.9%; default is 5%. When finished setting the threshold
percentage, press
TEST to exit SET-UP mode.
5. Connect the red lead to the
+
terminal and the black lead
to the COM terminal.
6. Connect the test leads to the device to be used as the reference
resistance. The resistance measurement will appear in
the primary display area.
7. Press the
TEST
button to accept that as the reference
value. The ΔRel symbol will appear and the percentage
difference will appear on the top line of the secondary
display indicating the instrument is in
DRM mode.
As you take subsequent measurements, the difference between
the measurement and the reference is displayed both in ohms
(primary display (§2.5)) and as a percentage (secondary
display (§2.5)).
If the difference exceeds the threshold percentage, an alarm
activates with a red back lit display and an audible buzzer (if
enabled) indicating the out of tolerance condition.
3.7.2 Resistance Mode Alarm Indicators
■
Before starting an insulation measurement, pressing
the
key activates the alarm. The alarm threshold
is displayed, along with the and symbols.
■
If the measurement exceeds the threshold, the

symbol is displayed.
■
If the measurement is below the threshold, the
instrument emits a continuous beep, the backlight
turns red and the
×
symbol is displayed.
3.7.3 Resistance Mode Error Indicators
■
If there is a voltage of more than 0.4V on the object to be tested, the instrument displays .
■
If the object to be tested is at a hazardous voltage, >30V, the symbol is displayed and the
instrument emits a pulsed beep.
■
If the measurement is outside of the measurement range, the instrument displays >420.0kΩ.
3.8 Insulation Resistance Tests
To avoid electrical shock and damage to the instrument when measuring resistance or continuity
in a circuit, ensure power to the circuit is turned
OFF
and all capacitors are discharged.
In Insulation Resistance mode the instrument outputs a DC voltage. This voltage depends on the
resistance to be measured. The device measures the voltage and current present between the two
terminals and determines the value of R=V/I.
You can perform up to five types of resistance tests, depending on instrument model. By default, the
instrument is in “unlocked” untimed test mode. In this mode, the test begins when you press the
TEST button, and ends when you release it. This mode is typically used to run short “spot” tests.
%
Ω
M
Ω
%
REL
DRM
Mode
Ω
%
REL