Loop measurements in networks from 100 to 750 V with up to 30 A
AMZC-305
Ohmmeters and loop impedance meters
AMZC-305
Loop impedance meter up to 400/690 V
| C/ María Barbeito, 14 | Contact Contact T [+34] 982 20 99 20 |
|---|---|
| 27003, Lugo, Spain | T [+34] 982 20 99 20 info@amperis.com | www.amperis.com |
Loop impedance in eight rated networks — up to 400/690 V — with high-current measurement and USB.
From the workshop to heavy industry
The AMZC-305 measures short-circuit loop impedance with 0.01 Ω resolution in networks of 110/190, 115/200, 127/220, 220/380, 230/400, 240/415, 290/500 and 400/690 V — a 100 to 750 V working range. The high-current measurement of up to 30 A yields 0.13 to 1999 Ω per IEC 61557, with the R and X components and the calculated short-circuit current.
Every circuit, also behind RCDs
The ZL-PE RCD mode measures from 0.43 Ω without tripping RCDs above 30 mA in 100…440 V networks; the device distinguishes phase from line voltage automatically, verifies the PE terminal with its contact electrode and measures with L and N swapped. The voltmeter reads up to 750 V — with 0.1 V resolution to 250 V — in every loop function, with an overvoltage alarm.
Main features
- Memory of 990 cells (3500 records) with USB interface.
- Test leads of 1.2, 5, 10 and 20 m or UNI-Schuko adapter.
- Short-circuit current calculated for the rated voltage.
- Operating frequency range 45…65 Hz.
- Powered by four AA batteries: over 3000 measurements.
- Auto-off after 120 seconds of inactivity.
Applications and delivery
Applications
- Industrial networks of 290/500 and 400/690 V.
- Short-circuit protection verification in LV installations.
- Socket-outlet testing with the UNI-Schuko adapter.
- RCD-protected boards measured without interruptions.
Rugged and complete
With double insulation per IEC 61010-1, CAT IV 600 V (CAT III 1000 V) and an IP54 housing of 260 × 190 × 60 mm and 2.2 kg, the AMZC-305 is delivered with three 1.2 m leads, probes and crocodile clips, USB cable, batteries, straps, case and calibration certificate; leads up to 20 m and socket adapters are optional.
990 memory cells and a USB port put every loop measurement on the computer.
Software & applications
Measurements that travel by USB
The documentation software manages reports, inspectors, test points and downloaded data
The AMZC-305 keeps 3500 records in its 990 memory cells and downloads them to the PC through the USB port. The free reader software receives loop impedances with their R and X components, calculated fault currents and voltages, organised by installation.
One archive for all networks
Whether the readings come from a 230/400 V office or from a 690 V plant, the software identifies each result by point and date, compares periodic verifications and exports or prints the documentation.
What the software provides
- USB download of the 990 cells (3500 records).
- Archive by clients, sites and measuring points.
Preview of a verification report of the installation, ready to print or export
- Export to popular formats and printing.
- History of verifications of each installation.
AMZC-305 — MEASUREMENT DATA
Fault loop impedance ZL-PE, ZL-N, ZL-L
| Display range | Resolution | Accuracy |
|---|---|---|
| 0.00…19.99 Ω | 0.01 Ω | ±(5% m.v. + 3 digits) |
| 20.0…199.9 Ω | 0.1 Ω | ±(4% m.v. + 3 digits) |
| 200…1999 Ω | 1 Ω | ±(4% m.v. + 3 digits) |
Range per IEC 61557: 0.13…1999 Ω (1.2 m leads); 0.25…1999 Ω (UNI-Schuko adapter). Networks 110/190…400/690 V; loop voltage range 100…440 V (ZL-PE, ZL-N) and 100…750 V (ZL-L); high-current measurement up to 30 A; R and X components; Ik calculation; 45…65 Hz.
Loop impedance ZL-PE RCD (no tripping)
| Display range | Resolution | Accuracy |
|---|---|---|
| 0.00…19.99 Ω | 0.01 Ω | ±(6% m.v. + 10 digits) |
| 20.0…199.9 Ω | 0.1 Ω | ±(6% m.v. + 5 digits) |
| 200…1999 Ω | 1 Ω | ±(6% m.v. + 5 digits) |
Range per IEC 61557: 0.43…1999 Ω (1.2 m leads); 0.50…1999 Ω (UNI-Schuko). Operating range 100…440 V; no tripping of RCDs >30 mA; contact electrode for PE checking; measurement with L-N swapped.
Voltage measurement
| Range | Resolution | Accuracy |
|---|---|---|
| 0…249.9 V | 0.1 V | ±(2% m.v. + 4 digits) |
| 250…750 V | 1 V | ±(2% m.v. + 2 digits) |
Available in every loop function; 45…65 Hz; overvoltage alarm.
"m.v." = measured value
AMZC-305 — TECHNICAL SPECIFICATIONS
| Type of insulation | Double, per EN 61010-1 |
|---|---|
| Measurement category | CAT IV 600 V (CAT III 1000 V) |
| Ingress protection | IP54, per EN 60529 |
| Power supply | 4 × AA alkaline batteries or NiMH accumulators |
| Battery performance | >3000 Z measurements (alkaline batteries) |
| Auto-off | After 120 seconds |
| Memory of results | 990 cells, 3500 records |
| Data transmission | USB |
| Display | Segment LCD, LED backlight |
| Operating temperature | 0…+45 °C |
| Storage temperature | -20…+60 °C |
| Humidity | 20…80 % |
| Dimensions | 260 × 190 × 60 mm |
| Weight | approx. 2.2 kg |
| Standards | IEC 61557, EN 61010-1 |