High-current short-circuit loop impedance meter with 0.1 mΩ resolution
When the short-circuit loop impedance is only a few milliohms and the prospective short-circuit current reaches tens of kiloamperes, you need a meter that drives a high current and measures with the four-wire method at tenth-of-a-milliohm resolution. The AMZC-310S drives up to 280 A at 400 V (160 A at 230 V) and measures ZS from 7.2 to 1999 mΩ per IEC 61557 with 0.1 mΩ resolution and ±(2% m.v. + 2 mΩ), without calibrating the leads, and displays short-circuit currents from 115.0 A to 32.0 kA at 230 V and from 200 A to 55.7 kA at 400 V; with 42 A two-wire it covers 0.13 to 199.9 Ω and also measures touch and shock voltage.
The most important features of the AMZC-310S are
Measurement of very small short-circuit loop impedances (with resolution of 0,1mΩ) using the current of 150A under 230V, maximum 280A under 440V, or measurement using the current of 23A under 230V, maximum 42A under 440V:
- Measurements on networks with rated voltages: 220/380V and 230/400V at 45...65Hz frequencies
- Allows measurement on short circuit: phase-phase, phase-protection, phase-neutral
- Distinction between phase and interphase voltage when calculating the short-circuit current
- Allows to change the length of the measuring wires (measurement 23/42A)
- Four-wire method, no conductor calibration required (150/280A measurement)
- Measurement of the expected contact voltage or the shock contact voltage (with resistor from 1kΩ)
- Measurement of alternating voltage 0...440V
- Memory of 990 results and option to send them to the PC
- Device meets the requirements of EN 61557
Measurement of short-circuit loop parameters by current
standard (2p, I =42A)Measurement of short circuit loop impedance Z:
Measuring range according to IEC61557: 0.13Ω... 199,9Ω for 1.2m conductors
Range
Resolution
Accuracy
0...19,99 Ω
0,01 Ω
±(2% v.m. + 3 digits)
20...199,9 Ω
0,1 Ω
±(3% v.m. + 3 digits)
Measurement of the effective resistance R and the short-circuit loop reactance X
Range
Resolution
Accuracy
0...19,99 Ω
0,01 Ω
±(2% v.m. + 3 digits)
20...199,9 Ω
0,1 Ω
±(3% v.m. + 3 digits)
Short-circuit current indications
Range
Resolution
Accuracy
1,150...1,999A
0,001A
Calculated on the basis of the short-circuit loop error
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
Measurement of short-circuit loop parameters by high current (4p, Imax=280A)
Strong current measurement of short circuit loop impedance Z:
Measuring range according to IEC61557: 7,2mΩ... 1999mΩ
Range
Resolution
Accuracy
0...199,9mΩ
0,1mΩ
±(2% v.m. + 2mΩ)
200...1999mΩ
1mΩ
Display ranges of the effective resistance R and the short-circuit loop reactance X
Range
Resolution
Accuracy
0...199,9mΩ
0,1mΩ
±(2% v.m. + 2mΩ)
200...1999mΩ
1mΩ
Short-circuit current indications
Measuring range according to IEC 61557: for Un = 230V: 115.0A... 32.0kA and for Un = 400V: 200A...55.7kA
Range
Resolution
Accuracy
115,0...199,9A
0,1A
Calculated on the basis of the short-circuit loop error
200...1999A
1A
2.00...19.99kA
0.01kA
20.0...199.9kA
0.1kA
200kA...*
1kA
230 kA for ULN
400 kA for ULL
Measurement of contact voltage U ST and shock voltage U T | ||
Range | Resolution | Accuracy |
0...100V | 1V | ±(10% v.m. + 2 digits) |
Voltage measurement (True RMS) | ||
Range | Resolution | Accuracy |
0...440V | 1V | ±(2% v.m. + 2 digits) |
Frequency range: DC, 45...65Hz | ||
Input impedance for the voltmeter: > 200kΩ | ||
Frequency measurement (for voltages in the range 50...440V) | ||
Range | Resolution | Accuracy |
45.0...65.0Hz | 0.1Hz | ±(0.1% v.m. + 1 digit) |
"v.m." - measured value | ||
Detailed features of the AMZC-310S | |
Electrical safety: | |
Type of insulation | Double, according to EN 61010-1 and IEC 61557 |
Measurement category | IV 300V according to EN 61010-1 |
Protection class, according to EN 60529 | IP20 |
Other technical data: | |
Food | Alkaline batteries LR14 (size C) (5 pcs.) |
Current limiting resistor | for 4p measurement 1,5Ω , for 2p measurement: 10Ω |
Number of measurements (alkaline batteries) | at least 2000 (4/min.) |
Temperature coefficient: | ±0.1% of the measured value /°C |
Nominal conditions of use: | |
Operating temperature | 0...+40°C |
Standard Accessories
- Test cable with banana plug; 1.2m; black
- Test cable with banana plug; 1.2m; yellow
- Probe with banana plug; black
- Probe with banana plug; yellow
- Probe for high currents (2 units)
- 3m test cable (2 units)
- Crocodile K03; black (4 units)
- Kelvin clamp (2 units)
- L1 Case
- RS-232 transmission cable
- Meter Harness
- Calibration certificate
- Operation manual
- Battery pack
Optional accessories
- Software for the creation of documentation
- Software for the creation of drawings and diagrams
- Software for the creation of measurement calculations
- USB key
- USB/RS232C Converter Adapter
- AGT-16P three-phase plug adapter
- AGT-32P three-phase plug adapter
- AGT-63P three-phase plug adapter
- Test cable with banana plug, 5m, yellow
- Test cable with banana plug, 10m, yellow
- Test cable with banana plug, 20m, yellow
AMZC-310S key data
- High current (4p): the AMZC-310S drives a maximum of 280 A at 400 V and 160 A at 230 V (30 ms) and measures ZS from 7.2 to 1999 mΩ per IEC 61557, with 0.1 mΩ resolution and ±(2% m.v. + 2 mΩ), using the four-wire method without lead calibration.
- Standard current (2p): a maximum of 42 A at 400 V and 24 A at 230 V (10 ms); ZS from 0.13 to 199.9 Ω with 1.2 m leads, 0.01 Ω resolution and ±(2% m.v. + 3 digits) up to 19.99 Ω.
- Prospective short-circuit current: in 4p, from 115.0 A to 32.0 kA at 230 V and from 200 A to 55.7 kA at 400 V per IEC 61557, displayed up to 230 kA (ULN) and 400 kA (ULL); loop resistance R and reactance X.
- Touch voltage: prospective touch voltage UST and shock voltage UT with a 1 kΩ resistor, from 0 to 100 V with ±(10% m.v. + 2 digits).
- Voltage and frequency: True RMS voltage from 0 to 440 V with ±(2% m.v. + 2 digits), DC and 45 to 65 Hz; frequency from 45.0 to 65.0 Hz with ±(0.1% m.v. + 1 digit).
- Networks and loops: 220/380 and 230/400 V, 180 to 440 V test range; phase-phase, phase-protective and phase-neutral loops, distinguishing phase and line voltage when calculating the short-circuit current.
- Instrument: the AMZC-310S has double insulation, CAT IV 300 V and IP20, runs on 5 LR14 (C) batteries from 0 to +40 °C and stores 990 results sent to the PC over RS-232.
Frequently asked questions
When do you need a high-current loop meter like the AMZC-310S?
When loop impedances are very small, in the milliohm range. With the four-wire method and up to 280 A, the AMZC-310S measures from 7.2 mΩ with 0.1 mΩ resolution and ±(2% m.v. + 2 mΩ), without lead calibration, and displays short-circuit currents per IEC 61557 of up to 32.0 kA at 230 V and 55.7 kA at 400 V.
Can it measure touch voltage?
Yes. The AMZC-310S measures the prospective touch voltage UST and the shock voltage UT, the latter with a 1 kΩ resistor simulating the resistance of the human body, from 0 to 100 V with ±(10% m.v. + 2 digits). This measurement uses the optional 20 m lead.
