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A broad-range measuring device allows for use of the test instrument in all alternating and 3-phase electrical systems with voltages from 65 to 500 V and frequencies of 15.4 to 420 Hz.
 Standard  at 300 V
 at 600 V
- Loop and line impedance measurement
- Measurement of insulation resistance using nominal voltage, with variable or rising test voltage
- Low-resistance measurement
- Earth resistance measurement
- Standing-surface insulation measurement
- Universal connector system
Special features:
- Display of approved fuse types for electrical systems
- Energy meter start-up testing
- Calculation of cable lengths for common copper wire cross-sections
- Measurement of biasing, leakage and circulating current of up to 1 A, as well as working current of up to 150 A with Clip 0100S current sensor clamp as accessory
- Phase sequence measurement (including highest line-to-line voltage)
 
Testing of residual current devices (RCCBs)
- Measurement of contact voltage without tripping the RCCB.
Contact voltage is measured with reference to nominal residual current using 1/3 of the nominal residual current value.
- Tripping test with nominal residual current, tripping time measurement
Special tests for systems and RCCBs
- Testing of equipment and RCCBs with rising residual current including indication of tripping current and contact voltage at the moment the RCCB is tripped
- Testing of RCCBs with: ½ × IN, 1× IN, 2× IN, 5× IN
- Testing of RCCBs which are suitable for pulsating residual direct current; testing is conducted with positive or negative half-waves
- Testing of RCCBs with adjustable residual current for determining contact voltage
Testing of special RCCBs (with PROFITEST MTECH and MXTRA)
- Selective S, SRCDs, PRCDs (Schukomat, Sidos and others), types G/R, AC, A and B
Testing of RCCBs in IT systems
| PROFITEST |
MBASE |
MPRO |
MTECH |
MXTRA |
| |
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| RCD measurements |
|
|
|
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| UB measurement without tripping the RCCB |
x |
x |
x |
x |
| Tripping time measurement |
x |
x |
x |
x |
| Tripping current measurement |
x |
x |
x |
x |
| Selective, SRCDs, PRCDs, type G/R |
x |
x |
x |
x |
| AC/DC sensitive RCDs, type B |
- |
- |
x |
x |
| Loop impedance, ZL-PE / ZL-N |
|
|
|
|
| Fuse table for systems without RCD |
x |
x |
x |
x |
| Without tripping the RCD, fuse table |
- |
- |
x |
x |
| With 15 mA test current without tripping the RCD |
x |
x |
x |
x |
| Earth resistance RE |
|
|
|
|
| I/U measuring method, mains powered |
x |
x |
x |
x |
Selective earth resistance
with probe, earth electrode and current clamp |
- |
x |
- |
x |
Earth loop resistance REloop
with 2 clamp meters |
- |
x |
- |
x |
| Equipotential bonding measurement RLO |
|
|
|
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| Automatic polarity reversal |
x |
x |
x |
x |
| Insulation resistance RISO |
|
|
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| Variable or rising test voltage |
x |
x |
x |
x |
| Voltage measurement |
|
|
|
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| UL-N / UL-PE / UN-PE / f |
x |
x |
x |
x |
| |
|
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| Special measurements |
|
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| Leakage current (clamp meter measurement) |
x |
x |
x |
x |
| Meter start-up |
x |
x |
x |
x |
| Phase sequence |
x |
x |
x |
x |
| Standing-surface insulation ZST |
x |
x |
x |
x |
| Earth leakage resistance RE (ISO) |
x |
x |
x |
x |
| |
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| Features |
|
|
|
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| Selectable user interface language |
x |
x |
x |
x |
| Memory (database for up to 50,000 objects) |
x |
x |
x |
x |
| RS 232 port for scanner |
x |
x |
x |
x |
| USB port for data transmission |
x |
x |
x |
x |
| ETC user software for PC |
x |
x |
x |
x |
| Measuring category CAT III 600 V / CAT IV 300 V |
x |
x |
x |
x |
| DKD calibration |
x |
x |
x |
x |
| Article number |
M520M |
M520N |
M520o |
M520P |
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