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MODEL IRM-5000P USER'S MANUAL
1.0 FUNCTIONAL DESCRIPTION
Vanguard Instruments Company's model IRM-5000P mega-ohmmeter is a
microprocessor-based, high-voltage, insulation test meter. The IRM-5000P is rugged
and portable, making it ideal for use in electrical, utility substations and in many other
industrial applications.
The sophisticated, insulation tester uses a dual-microprocessor design. One processor
is dedicated to the control of the power supply and measuring circuitry. While, the
second microprocessor is dedicated to the display, printer control and user interfaces.
These microprocessors interface with each other via an optical link to ensure the
operator's safety and isolation from the high-voltage inside the unit.
1.1 Test Voltage
The IRM-5000P can run tests with pre-set voltages consisting of: 500, 1000, 2500, and
5000 Vdc. The unit can also output test voltages specified by the user ranging from
50 Vdc to 5000 Vdc with a resolution of ±1 Vdc step.
1.2 High-Voltage Warning Display and Audible Alarm
A warning LED indicates when high-voltage is present at the test terminals. An audible
alarm will also alert the operator that a test is in progress.
1.3 Capacitor Discharge
The IRM-5000P automatically discharges any test charge left on the test material after
each test. The High-Voltage LED will warn the operator of the potential hazard that
exists during each discharging period.
1.4 Voltmeter
The IRM-5000P will always display on the LCD screen the voltage at the test terminals.
Thus, the user can use the IRM-5000P as a voltmeter.
Measurable voltage input
ranges from 50 to 1250 Volts, ac or dc.
1.5 Keypad
An alphanumeric keypad allows users to enter test identification numbers and control
functions.
1.6 LCD Display
A back-lit, 4-line by 20-character, LCD screen outputs test data and user messages. To
conserve energy, the backlight of the LCD will power off after 45 seconds of inactivity.
Pressing any button on the keypad can restore the backlight. The adjustment to the
contrast of the LCD can be done from the keypad. Pressing the "↑" key for more than 3
seconds will darken the LCD screen. Pressing the "↓" key for more than 3 seconds will
lighten the LCD screen.
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