• Universal digital insulation measuring instrument with an illuminated display
• Measuring range of 0.4 MΩ to 1 TΩ
• Variable test voltages or fixed steps of 100 V, 250 V, 500 V, 1.0 kV, 1.5 kV, 2.0 kV, 2.5 kV, 5.0 kV
• Polarization index and absorption ratio
• CAT IV 300 V / CAT III 600 V; DAkkS calibration certificate

The METRISO PRIME+ instrument is suitable for the measurement of insulation resistance at voltage-free devices and equipment with nominal voltages of up to 1000 V. It is also suitable for the measurement of insulation resistance with values of up to 1 T, and open-circuit voltages of up to 5000 V. The instrument is also equipped with a 1000 V measuring range for direct and alternating voltages. This provides users with the advantage of checking devices under test for the absence of voltage and discharging capacitive devices under test.

Applications for the METRISO PRIME+ include insulation measurement in large systems and for cables, motors, generators, etc.

Test Voltages to 5000 V and Voltage Measurement to 1000 V

The instrument is suitable for non-destructive measurement of insulation resistance in electrical systems, as well as in machines, transformers, cables, and electrical equipment utilized in, for example, locomotives, streetcars, and ocean-going vessels with selectable test voltages of up to 5 kV.

Testing for the absence of voltage at the device under test in systems of up to 1 kV can be performed with the voltage measuring range.

Discharging Capacitive Devices Under Test (DUT)

Capacitive devices under test such as cables and coils, which may be charged by the test voltage, are discharged by the measuring instrument. The falling voltage value can be observed at the display.

Measurements per EN 61557 Parts 1 and 2 (VDE 0413)

“Equipment for testing, measuring or monitoring protective measures in systems with line voltages of up to 1000 V AC and 1500 V DC, part 2, insulation resistance measuring instruments.”

Nominal current amounts to 1 mA at a test voltage of 100 V, 250 V, 500 V, or 1000 V.

Highly Insulated Measurement Cables

The highly insulated measurement cables are permanently connected for safety reasons and due to technical measuring considerations. Danger resulting from inadvertently disconnected cables, for example, in the event of charging caused by capacitive devices under test, is thus avoided.

NOTE: Initial testing should be performed after short-circuiting the measurement cables with their test probes. The instrument should display nearly zero M. A broken measurement cable can be detected in this way.

Polarization Index

A polarization index test is recommended for electrical machines. This procedure involves expanded testing of insulation resistance. DC measuring voltage from the METRISO PRIME+ is applied to the insulation for a duration of 10 minutes. Measured values are documented after one minute and after ten minutes. If the insulation is good, the value measured after ten minutes is higher than the value measured after one minute. The relationship between the two measurement values is the polarization index. Charged material within the insulation is aligned due to the application of measuring voltage over a long period of time, resulting in polarization. The polarization index indicates whether or not the charged material contained in the insulation can still be moved, thus allowing for polarization. This, in turn, is an indication of the condition of the insulation.

See the METRISO PRIME+ Spec Sheet in the Documents section for specifications.

Data Management and Report Generation

The data of each measurement can be stored under a selected object number. Furthermore, a description for this object can be entered via the keyboard of the optional PSI module. The data management function allows for individual measurement data of a previously selected object to be displayed and to be deleted if required or for previously entered objects to be deleted. Depending on the number of stored objects (max. 254), up to 1,600 measurements can be stored. The current memory occupancy is continuously displayed as a bar graph. Report data can be printed out at an external printer with Centronics interface via the optional PSI module or via printer adapter DA-II (accessory). Furthermore, it is possible to create report templates on a PC that can be downloaded to the test instrument.

1. Function selector switch

2. Select main/sub-menus, adjust values

3. Select main/sub-menus, adjust values

4. Socket connector for RS232

5. Illuminated LCD panel

6. Signal lamp for pass/fail

7. Menu

8. Store

9. Start

10. Signal lamp: test run