UNI-T UT593 - Insulation Resistance Measurement

UT593/595 OPERATING MANUAL UT593/595 OPERATING MANUAL
Selection and operation of function keys F1-F4 is shown below:
F1 F2
F3
F4
Buzzer and backlight
Test lock
ZERO
Not used
Instructions on key operation:
Press and hold F1 for about 2 seconds to open and close the backlight; press and release F1 to
open and close 20 Ù comparison function; at the same time, LCD shows the buzzer mark. When
the measured continuity value is lower than 20 Ù, the buzzer will give an alarm.
F2 is used to open and close the measuring lock function. When long-time measurement is
needed, press F2 to start Test lock measurement function; at the same time, the LCD displays the
symbol of lock. In this case, you only need to press and release the Test key to start long-time
measurement.
Press the test key again to stop measurement. If you want to stop the measuring lock function,
press the F2 again or make the rotary switch point to other functions.
F3 is used to realize return to zero of measuring pens. After two pens are reliably short-circuited,
press and hold F3 until LCD shows the reading of 0.00 Ù and the symbol of ZERO a nd t hen t his
function operation is considered to be completed.
Notice:
1. In order to ensure precision of measured value, you must conduct return-to-zero by short-circuit
before test.
2. Do no measure live objects.
3. Before test, when voltage between two measuring terminals is more than 30V, the instrument will
automatically display the voltage between two terminals. At the same time, the buzzer gives an
alarm. In this case, the measuring key TEST is disenabled.
VIII. INSULATION RESISTANCE MEASUREMENT
(FOR CONNECTION DIAGRAM, SEE FIG. 4)
(Fig.4)
(1).Before measuring insulation resistance, the circuit to be tested must be totally discharged and
must be completely isolated from the power circuit.
(2).Insert the red test line or special pen with TEST key into the “Red” input port, black test line
into the Black input port.
(3).Connect red and black alligator clips or pen test probe to the circuit to be tested.
Wiring method: