Megger ® CM500 Series

Multifunction Insulation Testers

Megger CM500 Multifunction Insulation Tester
  • Combines the functions of several
  • Instruments in one package
  • Non-tripping Loop Test range for tests on RCD protected circuits
  • RCD ramp test features actual tripping current
  • Stores approximately 750 different test results in internal memory
  • Recall results to the display for manual certificate completion
  • Direct printer output for on-site printing of test results
Product Description:

The Megger® CM500 Multifunction Installation Tester is a compact product that combines all the functions required to fully test Domestic, Commercial and Industrial fixed wiring, in accordance with International Standards. The CM500 is the first Installation Tester with a nontripping Loop Test guaranteed not to trip any RCD rated 30 mA or above. Its memory and storage capability offers all data to display, download to a PC and a unique on-site print facility.

General Information:
  • Storage of test results
  • Recall of test results to instrument display
  • Direct serial printer output via RS232 port
  • Connect to IBM compatible PC for storage of results
  • Ramp Test for measuring RCD actual trip currents
  • Variable RCD test current for programmable devices
  • Designed and manufactured in accordance with International Safety Standards
  • Insulation tests at 250 V, 500 V & 1000 V with 1 mA output
  • Continuity tests with 200 mA short circuit capability
  • Phase-Phase, Phase-Neutral, Phase-Earth Loop Tests
  • High current Loop Testing with 0,01 Ω resolution
  • Prospective Earth Fault and Short Circuit Current

Tests in accordance with International Standards and National Wiring Regulations including BS7671 (16th edition wiring regulations) and Euro Standard EN61557. Test lead resistances can be nulled and a continuity buzzer is incorporated for rapid identification of open and short circuits. Settable automatic polarity reversal and result averaging.

Loop tests are performed to a resolution of 0,01 Ω with direct display of PEFC and PSCC. A unique low current Loop Test with 0,1Ω resolution for testing circuits protected by an RCD rated at 30 mA or above, without tripping the RCD, including the newer electronic ones.

Auto-ranging earth resistance function enables measurement of earth electrode resistance on TT systems. Verification of the correct operation of RCDs rated between 10 mA and 1000 mA with trip timing up to 2000 ms. A ramp test indicate actual trip current to aid in fault diagnosis and variable test current function enables the testing of programmable and specialist devices.

Upon connection to the mains supply the polarity and voltage are displayed to show correct wiring of the socket under test and warn of live voltages. Supply frequency is indicated at the touch of a button.

Approximately 750 different results may be saved into internal memory for use later on.

Stored results may be recalled to the CM500 display to enable reviewing and facilitate the manual recording and completion of test reports and certificates.

Test results may be printed directly on site by simply connecting an appropriate serial printer to the RS232 port.

Meets or exceeds the requirements of EN61010-1 Category III 480 V (max) phase-phase.

Ranges and Accuracies:
Voltage measurement: 25 to 500 V ±2% ±2 digits
Frequency Measurement d.c., 16,0 to 460 Hz ±0,1% ±1 digit
Insulation Test Ranges
1 kΩ to 99,9 MΩ
1 kΩ to 299 MΩ
1 kV
1 kΩ to 499 MΩ
±2% ±2 digits (up to 99 MΩ)
Continuity & Resistance Ranges
0,01 Ω to 99,9 Ω ±2%±2 digits
100 Ω to 99,9 kΩ ±5% ±2 digits
0,01 μA
Open circuit voltage:
4 – 5 V d.c.
Test current: 200 – 250 mA up to 2 Ω
Loop & Earth Resistance Ranges Line / Earth& Earth Electrode Supply100 to 280 V 45 to 65 Hz
0,01 Ω to 9,99 Ω
±5% ±0,03 Ω
10,0 Ω to 89.9 Ω
±5% ±0,5 Ω
90 Ω to 899 Ω
±5% ±5 Ω
900 Ω to 3,00 kΩ
±5% ±20 Ω
Line / Line(Phase / Phase) Supply
100 to 480 V 45 to 65 Hz0,01 Ω to 19,99 Ω ±5% ±0,03 Ω
Calculated from nominal supply voltage divided by loop resistance.
Basic Accuracy:
40 nF – 4 μF: 0,8% ±5 dig. <40 nF, >4 μF ±4%
RCD Test Ranges
Supply 100 to 280 V 45 to 65 Hz
IDn 10, 30, 100, 300, 500,1000 mA & variable test current 10 mA to 1 A
Current accuracy +2%/+8%No Trip (1 1/2 IDn),Trip (IDn), 150 mA Fast Trip, 5I Dn and Ramp
Trip timing:
0,1 to 1999 ms ±1% ±1 ms
Contact voltage:
0,1 to 90,0 V +10% -0% ±5 digits
Auto Sequence:
150 mA 40 ms test
pdf_pic Downloads: General Specifications
Related links:
5kV units
Power Supply 8 x 1,5V Alkaline cells type LR6 or 1,5V nickel cadmium rechargeable cells. A new set of alkaline battery cells will typically give more than 4500 insulation or 3250 continuity tests. Fuses Replaceable 500 mA (F) HBC 10 kA 500 V. Non-replaceable 7 A (SIBA 70-065-63) Safety Double insulated to IEC1010- 1(1995), EN61010-1(1995) Installation Category III, 230V phase-ground, 440V phasephase. E.M.C. In accordance with IEC61326 including Amendment No.1 Dimensions 245 x 200 x 95mm Weight 1.35 kg space   index web