Verifying a low-voltage installation to IEC 61557 and, with the same instrument, testing cable insulation at more than 1000 V calls for a multifunction tester with a 2500 V test voltage. The AMPI-525 measures insulation at 50 to 2500 V up to 9.99 GΩ per IEC 61557-2, with ±(3 % m.v. + 8 digits) up to 999 MΩ, the loop from 0.13 to 1999 Ω with ±(5 % m.v. + 3 digits), AC, A and B RCDs, 3-pole earth from 0.5 Ω to 1.99 kΩ and continuity at 200 mA.
AMPI-525 key data
- Insulation: 50, 100, 250, 500, 1000 and 2500 V; range per IEC 61557-2 from 2.50 MΩ to 9.99 GΩ at 2500 V and up to 3.00 GΩ at 1000 V; ±(3 % m.v. + 8 digits) up to 999 MΩ and ±(4 % m.v. + 6 digits) from 1.00 to 9.99 GΩ; generated voltage -0/+10 %, current below 2 mA and automatic discharge.
- Timed tests: 1 to 600 s timer with two automatically calculated absorption coefficients, and testing of cables with up to 5 conductors with an optional adapter.
- Short-circuit loop: ZL-PE, ZL-N and ZL-L from 0.13 to 1999 Ω per IEC 61557 with the 1.2 m lead, 0.01 Ω resolution and ±(5 % m.v. + 3 digits); prospective short-circuit current up to 40 kA and maximum test current of 41.5 A (10 ms) at 415 V.
- No-trip loop: ZL-PE from 0.50 Ω with ±(6 % m.v. + 10 digits) up to 19.99 Ω, without tripping RCDs of IΔn ≥ 30 mA.
- RCDs: AC, A and B types from 10 to 1000 mA; tA with 1 ms resolution and ±(2 % m.v. + 2 digits); IA with ±5 % IΔn for sinusoidal and ±10 % IΔn for pulsating and DC current.
- Earth and continuity: 3-pole from 0.5 Ω to 1.99 kΩ per IEC 61557-5 with ±(2 % m.v. + 4 digits) up to 9.99 Ω; continuity from 0.12 to 400 Ω per IEC 61557-4 with a minimum of 200 mA in both polarities and ±(2 % m.v. + 3 digits).
- Instrument: 4 LR14 batteries or a 4.8 V 4.2 Ah Ni-MH pack for more than 3000 loop or RCD measurements and more than 2000 insulation measurements; 990-cell memory (57,500 results), USB and 433 MHz radio, IP54, CAT IV 300 V (CAT III 600 V), 288 × 223 × 75 mm and 2.2 kg.
Advantages
Insulation up to 2500 V
Few multifunction meters test RISO at 2500 V: the range reaches 9.99 GΩ per IEC 61557-2 and, with the AutoISO-2500 adapter, 3-, 4- or 5-core cables are tested automatically without changing connections.
Loop with 0.01 Ω resolution
Impedance ZL-PE, ZL-N and ZL-L is measured from 0.13 to 1999.9 Ω with ±(5% m.v. + 3 digits), also in circuits protected by RCDs without tripping them.
RCDs with a single trip
The automatic mode measures the tripping time tA and tripping current IA of AC, A and B type RCDs — general, short-time delay and selective — obtaining both parameters from a single trip of the breaker.
Standards-based earth and continuity
Earth resistance by the 3-pole method covers 0.5 Ω to 1.99 kΩ per IEC 61557-5, and continuity of protective conductors is verified with ±200 mA per IEC 61557-4.
Applications
- Complete verification of electrical installations before commissioning.
- Periodic electric-shock protection inspections in housing and industry.
- Automatic testing of multicore cables with the AutoISO-2500 adapter.
About the product
The AMPI-525 is a multifunction meter of electrical installation parameters focused on insulation: it tests at 50, 100, 250, 500, 1000 and 2500 V, with a timer from 1 to 600 s and two absorption coefficients calculated automatically, and discharges the object after each test. Voltage measurement up to 500 V, frequency and phase sequence complete its functions.
The 990-cell memory stores up to 57 500 records that travel to the PC over USB 2.0 or radio, where the reader software archives them and the reporting software generates the documentation. With CAT IV 300 V (CAT III 600 V), 288 × 223 × 75 mm and about 2.2 kg, it accompanies installers and measurement engineers.
Available accessories: WS-03 UNI-Schuko adapter, 1.2 m and 5 kV leads, 15 m and 30 m reel leads, probes, clips, earth rods, battery with charger, carrying case and calibration certificate; optionally the AutoISO-2500, AGT three-phase adapters and the OR-1 receiver.
Technical specifications
| Fault loop impedance | ZL-PE, ZL-N, ZL-L: 0.13…1999.9 Ω per IEC 61557; res. 0.01 Ω |
| Loop in RCD mode | From 0.50 Ω without tripping RCDs |
| RCD testing | AC, A and B types; tA 0…500 ms; IA with a single trip |
| Insulation | 50…2500 V; up to 9.99 GΩ per IEC 61557-2 |
| Earth resistance | 3-pole: 0.5 Ω…1.99 kΩ per IEC 61557-5 |
| Continuity | ±200 mA per IEC 61557-4; 0.12…400 Ω |
| Memory and interface | 990 cells (57 500 records); USB 2.0 and radio |
| Safety | CAT IV 300 V (CAT III 600 V); IP54 |
| Insulation accuracy | ±(3 % m.v. + 8 digits) up to 999 MΩ; ±(4 % m.v. + 6 digits) from 1.00 to 9.99 GΩ |
| Loop and RCD accuracy | ZS: ±(5 % m.v. + 3 digits); tA: ±(2 % m.v. + 2 digits); IA: ±5 % IΔn (sinusoidal) |
| Power supply | 4 × LR14 or Ni-MH 4.8 V 4.2 Ah; > 3000 loop or RCD measurements |
Frequently asked questions
Which multifunction installation tester measures insulation at 2500 V?
The AMPI-525 offers 2500 V in addition to 50, 100, 250, 500 and 1000 V; at 2500 V its range per IEC 61557-2 runs from 2.50 MΩ to 9.99 GΩ, with ±(4 % m.v. + 6 digits) above 1 GΩ, and it discharges the object automatically at the end of the test.
How many measurements does the AMPI-525 make on one set of batteries?
On 4 LR14 alkaline batteries it makes more than 3000 loop or RCD measurements and more than 2000 insulation or resistance measurements; it also takes a 4.8 V 4.2 Ah Ni-MH pack, and auto-off can be set to 5, 15, 30 or 60 min or disabled.
Which insulation test voltages are available?
Six voltages — 50, 100, 250, 500, 1000 and 2500 V — with IEC 61557-2 ranges reaching 9.99 GΩ at 2500 V.
Can it measure the loop without tripping the RCD?
Yes. The RCD mode measures ZL-PE from 0.50 Ω in circuits with RCDs of 30 mA or more without causing them to trip.
How does it test RCDs?
It measures the tripping time and current of AC, A and B type RCDs with currents from 0.5 to 5 IΔn, and its automatic mode obtains both parameters from a single trip.
What does the AutoISO-2500 adapter add?
It automatically tests the insulation of 3-, 4- or 5-core cables without rewiring between measurements, saving most of the testing time.
