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MZC 304

Measurements of impedance in a short circuit loop.
- L-PE circuit,
- L-N, L-L circuit,
- L-PE(RCD) circuit - without tripping the circuit breaker > 30mA.
Low voltage resistance measurement:
- continuity measurement - DC current +200mA with wire resistivity reset
- low current resistance measurement with accoustic signalling,
the measurements are posible in instalations 220/380V, 230/400V, 240/415V with frequeency range 45...65Hz.
memory of 10 banks of 99 cells each (min.10000 records).
Radio wireless interface comunication

MZC-304 Technical Specifications

Measurement of very low short circuit loop impedances (with resolution 0,1mΩ) with a current of 150A at 230V; maximum 280A at 440V or measurement with a current of 23A at 230V; maximum 42A at 440V.
- measurements in installations with rated voltages between: 220/380V and 230/400V and frequencies 45...65Hz,
- ability to perform measurements in short circuit system: phase-phase, phase-protective, phase-neutral,
- differentiation between the phase voltage and the inter-phase voltage while calculating the shortcircuit current,
- Ability to change the length of test leads (measurement 23/42A),
- four-pole method, test leads do not require calibration (measurement 150/280A).
Touch voltage and touch shock voltage measurement (with resistor 1kΩ).
AC voltage measurement in range 0...440V.
Memory for 999 measurement results with an ability to transfer the data to a PC.
Meter meets the requirements of the standard EN 61557.

Electric security:
- type of insulation: double, according to EN 61010-1 and IEC 61557
- measurement category: CAT IV 300V acc. to EN 61010-1
- protection class acc. to EN 60529: IP20

Other technical data:
- power supply     alkaline batteries LR14 (C) (5 pcs.)
- resistor limiting the current:
   for measurement 4p: 1,5Ω
   for measurement 2p: 10Ω
- number of short circuit loop measurements (alkaline batteries): min. 2000 (4/min.)
- temperature coefficient: ±0,1% of measured value /°C

Rated operational conditions:
- operating temperature: 0...+40°C

Voltages measurement (True RMS)

Range	Resolution	Accuracy
0...440V	1V	±(2% m.v. + 2 digits)

· frequency range: DC, 45...65Hz
· input impedance of the voltmeter: >200kΩ

Frequency measurement (for voltages within the range 50...440V)

Range	Resolution	Accuracy
45,0...65,0Hz	0,1Hz	±(0,1% m.v. + 1 digits)

Short circuit loop parameters measurement using high current (4p, I_max=280A)

High-current of measurement of short circuit loop impedance Z_S:
measuring range according to IEC61557: 7,2mΩ...1999mΩ

Range	Resolution	Accuracy
0...199,9mΩ	0,1mΩ	±(2% m.v. + 2mΩ)
200...1999mΩ	1mΩ	±(2% m.v. + 2mΩ)

Short circuit resistance R_S and reactance X_S display range

Range	Resolution	Accuracy
0...199,9mΩ	0,1mΩ	±(2% m.v. + 2mΩ) impedance reading for a particular measurement
200...1999mΩ	1mΩ

Prospective short circuit loop current
measuring range according to IEC 61557:
for U_n = 230V 115,0A...32,0kA
for U_n = 400V 200A...55,7kA

Range	Resolution	Accuracy
115,0...199,9A	0,1A	accuracy of the current indication computed, respectively, with the use of resistance measurement
200...1999A	1A
2,00...19,99kA	0,01kA
20,0...199,9kA	0,1kA
200kA...*	1kA

* 230 kA for U_L-N
400 kA for U_L-L

Measurement of short circuit loop using standard current (2p, I_max=42A)

Touch voltage measurement U_ST (shock voltage U_T)

Range	Resolution	Accuracy
0...100V	1V	±(10% m.v. + 2 digits)

Short circuit loop impedance Z_S measurement:
measuring range according to IEC61557: 0,13Ω...199,9Ω for 1,2m long test leads

Range	Resolution	Accuracy
0,00...19,99Ω	0,01Ω	±(2% m.v. + 3 digits)
20,0...199,9Ω	0,1Ω	±(3% m.v. + 3 digits)

Short circuit resistance R_S and reactance X_S display range

Range	Resolution	Accuracy
0,00...19,99Ω	0,01Ω	±(2% m.v. + 3 digits) impedance reading for a particular measurement
20,0...199,9Ω	0,1Ω	±(2% m.v. + 3 digits) impedance reading for a particular measurement

Prospective short circuit loop current

Range	Resolution	Accuracy
1,150...1,999A	0,001A	accuracy of the current indication computed, respectively, with the use of resistance measurement
2,00...19,99A	0,01A
20,0...199,9A	0,1A
200...1999A	1A
2,00...19,99kA	0,01kA
20,0...40,0kA	0,1kA