© PCE Instruments
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3.12
% 4
– 20mA Measurements
• Set up and connect as described for DC mA measurements.
• Set the rotary function switch to the 4-20mA% position. Press and hold the MODE button to
indicate “%4-20mA”.
• The meter will display loop current as a % with 0mA=-25%, 4mA=0%, 20mA=100%, and
24mA=125%.
3.13
LO Measurements
• Set the function switch to the green 50Ω/200mA position.
• Insert the black test lead banana plug into the negative INSULATION- jack. Insert the red test
lead banana plug into the positive jack.
• Connect the tips of the test leads to both ends of the circuit under test. read resistance in Ω on
the LCD. The two ranges
(50.000/500.00Ω) can be switched automatically; the primary display
of the resistance in Ω, flashes synchronously with the analog bar.
• When the impedance on circuit is below approximately ≤35Ω.It will indicate by a continuous
beeper.
• The current is from 200 to 220mA while the tested resistance is 0Ω.
3.14
Insulation Resistance Measurements
• Set the function switch to the green 50~1000V/5000MΩ position.
• Press the RANGE key to step through the available voltages until you select the voltage you
want. You can choose 50V, 125V, 250V, 500V or 1000V. There are 4 ranges:
4MΩ, 40MΩ,
400MΩ, 4000MΩ, can be switched automatically for every voltage block.
• Primary display shows insulation resistance and unit is MΩ, synchronized with analog bar. The
left auxiliary display shows current insulation voltage outpour measurement, the right auxiliary
display shows setting insulation voltage outpour measurement, unit V.
• Before measurement check the voltage range of tested device is applicable to the requirement
of insulation measurement voltage. Please ensure there are no parts that will be damaged by
insulation measurement voltage. Many parts will be damaged undue 1000V (and other ranges).
For example, power factor capacitor, low voltage insulation cable, electronic dimmer and
common electronic parts are all possible to be damaged under 1000V (and other ranges). Turn
to related voltage range after confirming the voltage.
• Connect two measurement leads to tested device; Push down and hold the “TEST” button /or
press the “LOCK” key first and then the “TEST” button, if the tested is electriferous and its
voltage (AC/DC) is over 30V, it will refuse work and no high-voltage testing occurs, simultaneity,
it shows “>30V” on the LCD, the symbol “ ” flashes, and the buzzer warns frequently. If the
tested is diselectriferous or its voltage is lower than 30V, it will enter into the formal testing
process and brings the high-voltage. On the primary display, the insulation
resistance in MΩ is
indicated in-phase with analog bar; on the secondary display, the tested insulation voltage in V
(DC) is indicated, the symbol “
” flashes and the buzzer warns frequently.
• Being free from the “TEST” button or pushing down the “TEST” button in the “LOCK” status can
exit from the “LOCK” status and shutoff the high-voltage, synchronously, the resistance values
is indicated in the primary display will be held, and the secondary display still be in the status of
monitoring the insulation voltage for the tested. Measurement is over. Subsequently, both ends
of the wire insulation voltage measurement by instrument internal electronic switch release
voltage.
• Turning the function switch can exit automatically from testing status during the process.
• Absorptance & Polarize measurement mode: In the insulation test condition, press the MAX/MIN
key to activate the Absorptance & Polarize measurement mode. The left auxiliary display shows
Absorptance measurement, the right auxiliary display shows Polarize measurement.
Summary of Contents for PCE-ITM 20
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