Testing power and control cables, motors, transformers and switchgear at 500, 1000 or 2500 V calls for a meter that reaches the teraohm range and calculates the absorption coefficients with fixed times of 15, 60 and 600 s. The AMIC-2505 reaches 500 GΩ at 500 V, 1 TΩ at 1000 V and 2 TΩ at 2500 V per IEC 61557-2, with an accuracy of ±(3% m.v. + 20 digits) over the whole range, delivers PI and DAR or Ab1 and Ab2, and its G guard terminal removes surface current in three-lead measurements.
AMIC-2505 key data
- Voltages and ranges: the AMIC-2505 measures up to 500 GΩ at 500 V, 1 TΩ at 1000 V and 2 TΩ at 2500 V; the IEC 61557-2 range starts at RISO min = UISO/1 mA, with a nominal current of 1 mA.
- Insulation accuracy: ±(3% m.v. + 20 digits) over the whole display range, from 0.0 kΩ to 2.000 TΩ, with resolution from 0.1 kΩ.
- Absorption coefficients: fixed times t1 = 15 s (30 s in PI/DAR mode), t2 = 60 s and t3 = 600 s; the meter shows RISO, leakage current, Ab1 and Ab2 (or DAR and PI) and the partial readings at each time.
- Three-lead measurement: the G terminal is connected, for example, to the transformer tank or to a foil wrapped on the cable insulation to cancel surface currents; the maximum short-circuit current is 1.4 mA ±15%.
- Interference and discharge: with an interference voltage of 25 to 50 V it measures with a noise warning, above 50 V the test is blocked, and at the end the object is discharged through 100 kΩ.
- Voltage measurement: AC/DC from 0 to 600 V with ±(3% m.v. + 2 digits) and 45…65 Hz.
- Power and environment: 9.6 V NiMH battery pack with fast charging in about 3 h and about 900 RISO measurements per charge, IP54, operation from -10 to +40 °C, 1.3 kg and CAT IV 600 V (CAT III 1000 V).
Advantages
Up to 2 TΩ at 2500 V
With a 2500 V test voltage the range reaches 2 TΩ (1 TΩ at 1000 V and 500 GΩ at 500 V), with a nominal current of 1 mA, an accuracy of ±(3% m.v. + 20 digits) and indication of the actual test voltage during the measurement.
Diagnosis by absorption coefficients
The meter times the T1, T2 and T3 intervals over the 15, 60 and 600 s range and calculates one or two absorption coefficients, with an acoustic signal every five seconds to capture the time characteristic of the insulation.
Two- or three-lead measurement
The three-lead method diverts the surface current of contaminated insulation, and the leakage current reading during the test helps to judge the real condition of the object.
Safe on live objects
Protection prevents measuring an energised object, the capacitance of the object is discharged automatically after each test, and the voltmeter function measures AC and DC voltages from 0 to 600 V.
Applications
- Insulation testing of power and control cables.
- Motors, transformers and switchgear in low and medium voltage.
- Periodic verifications in industrial maintenance.
About the product
The AMIC-2505 is an insulation resistance meter with test voltages up to 2.5 kV, an ergonomic housing and intuitive operation: every test voltage and mode is chosen with a rotary switch, which is particularly useful when many measurements are chained. Resolution starts at 0.1 kΩ and the maximum short-circuit current is 1.4 mA ±15%.
It meets the requirements of the EN 61557 standard and of double insulation per EN 61010-1, with a CAT IV 600 V (CAT III 1000 V) measurement category. The firmware supports communication with a PC through the optional USB cable, to download the readings to a computer.
Available accessories: 1.8 m, 5 kV test leads (red, blue and shielded black), 5 kV pin probe, 11 kV crocodile clips, battery pack with mains charger, carrying case, straps and a calibration certificate; optionally 5 and 10 m leads, the PRS-1 probe for floors and walls, the CS-1 cable simulator and a USB cable.
Technical specifications
| Test voltages | 500 / 1000 / 2500 V |
| Measuring range | Up to 2 TΩ per IEC 61557-2 (UISO = 2500 V, IISO = 1 mA) |
| Basic accuracy | ±(3% m.v. + 20 digits) |
| Absorption coefficients | T1, T2, T3 within 15 / 60 / 600 s |
| Voltage measurement | AC/DC 0…600 V; 45…65 Hz |
| Safety | CAT IV 600 V (CAT III 1000 V); IP54 |
| Power supply | 9.6 V NiMH battery pack with mains charger |
| Dimensions and weight | 260 × 190 × 60 mm; 1.3 kg |
| Voltage measurement accuracy | ±(3% m.v. + 2 digits) |
| Battery life | Approx. 900 RISO measurements per charge; fast charging in about 3 h |
| Operating temperature | -10…+40 °C |
Frequently asked questions
Can the AMIC-2505 calculate the 10-minute polarization index?
Yes. The AMIC-2505 works with fixed times t1 = 15 s (30 s in PI/DAR mode), t2 = 60 s and t3 = 600 s, so it obtains PI from the 1- and 10-minute readings and DAR from the 30 s and 1-minute readings.
What does the AMIC-2505 do if the object carries induced voltage?
With an interference voltage between 25 and 50 V it still measures, showing NOISE! and adding uncertainty; above 50 V it blocks the test and lights the red LED. Its RISO inputs are protected up to 600 V for 60 s.
What range is covered at each test voltage?
At 500 V it measures up to 500 GΩ, at 1000 V up to 1 TΩ and at 2500 V up to 2 TΩ, always indicating the actual test voltage during the measurement.
Can it measure leakage current?
Yes. During the insulation test it continuously indicates either the resistance or the leakage current flowing through the insulation of the object.
What happens when the measurement ends?
The meter automatically discharges the capacitance of the tested object, so it can be disconnected safely.
Is it suitable for installations in service?
It is protected against measuring live objects and includes an AC/DC voltmeter from 0 to 600 V to check the state of the circuit before the test.