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The Avo (owned by Megger) CM500 is a Multifunction Installation Tester, used to functionally test domestic, commercial and industrial fixed wiring in accordance with international standards. It provides verification of the correct operation of RCDs rated between 10 mA and 1000 mA with trip timing up to 2000 ms, and offers all data to display and download to a PC and on-site print facility. A ramp test indicates 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, and stored results may be recalled to the CM500 display to enable reviewing and facilitate the manual recording and completion of test reports and certificates.
Specifications.
Supply Voltage: 25 to 500 V ±2% ±2 digits.
Supply Frequency DC: 16.0 to 460 Hz ±0.1% ±1 digit.
Insulation Test Ranges:
250, 500 & 1k VDC into 1 mA load,
1 kΩ to 99.9 MΩ @ 250 V,
1 kΩ to 299 MΩ @ 500 V,
1 kΩ to 499 MΩ @ 1k V,
±2% ±2 digits (up to 99 M Ω).
Continuity & Resistance Ranges:
0.01 Ω to 99.9 Ω ±2% ±2 digits,
100 Ω to 99.9 kΩ ±5% ±2 digits.
Open Circuit Voltage: 4 - 5 VDC.
Test Current: 200 - 250 mA up to 2 Ω.
Loop & Earth Resistance Ranges Line / Earth & Earth Electrode Supply:
100 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 Hz,
0.01 Ω to 19.99 Ω ±5% ±0.03 Ω.
Low Current Loop Test (15mA) Supply:
100 to 280 V 45 to 65 Hz,
0.2 Ω to 200 kΩ ±3% ±0.3 Ω,
200 to 1.99 kΩ ±5% ±5 Ω.
Noise Immunity: 1s within ±0.3 Ω.
PEFC calculated from nominal supply voltage divided by loop resistance.
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.
No Trip (1/2 IDn) -8% to 2% Trip (I, 5I 150 mA fast trip) +2% to +8% Ramp test ±3%.
RCDs.
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.
Safety.
Double insulated to IEC61010-1.
Installation Category III, 230V phase-ground, 440V phase-phase.
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