Micro-ohmmeters compared
Technical data of the 9 units of this type offered by Amperis, row by row. Tick «Compare» on two or three to see them side by side, copy the link or print the comparison.
| Ohmmeter PDRM-1A | PDRM-10A Ohmmeter | RMO-A: circuit-breaker micro-ohmmeter | RMO-G Series: contact micro-ohmmeters | RMO-H: lightest micro-ohmmeter | RMO-C No product page on this site | RMO-E No product page on this site | RMO-EH No product page on this site | RMO10H No product page on this site | |
|---|---|---|---|---|---|---|---|---|---|
| Test current | 1 A, 100 mA and 5 mA DC, automatically adjusted | Four-wire (Kelvin), with automatic current injection from 5 mA to 10 A | Current ripple: Below 1% | Up to 800 A DC; ripple below 1% | 1 – 300 A DC regulated, per model | 200 A DC continuous (RMO200C); 300 A for 10 min (RMO300C); 500 A for 30 s (RMO500C); ripple below 1 % | Up to 60 A DC (RMO60E); 10 mA – 100 A DC (RMO100E); up to 12 V DC at full load | 1 mA – 10 A DC, regulated and user-selectable | 1 mA – 10 A DC, regulated and user-selectable |
| Measuring range | 1 µΩ to 200 Ω, automatic range selection | 0.01 µΩ to 200 Ω; resolution of 0.01 µΩ | 0.1 µΩ – 999.9 mΩ; expandable to 6 Ω | 0.1 µΩ – 999.9 mΩ; expandable to 6 Ω | 0.1 µΩ – 3000 mΩ | 0.1 µΩ – 999.9 mΩ; expandable to 6 Ω | 0.1 µΩ – 20 Ω | 0.1 µΩ – 5 kΩ | 0.1 µΩ – 3 kΩ |
| Accuracy | 0.1% of reading ± 2 counts | ± 0.1% ± 2 digits on all scales | ±(0.1% rdg + 0.1% FS) | ±(0.1% rdg + 0.1% FS) | ±(0.1% rdg + 0.1% FS) up to 1 Ω | ±(0.1 % rdg + 0.1 % FS) | ±(0.1 % rdg + 0.1 % FS) | ±(0.2 % rdg + 0.2 % FS) | ±(0.2 % rdg + 0.2 % FS) |
| Models | Not stated on the product page | Not stated on the product page | RMO100A to RMO600A (100 – 600 A DC) | RMO100G to RMO800G (7 models) | RMO-H1/-H2/-H3 and RMO-H21/-H22/-H23 | RMO200C, RMO300C and RMO500C | RMO60E and RMO100E | RMO10EH (handheld, battery-powered) | RMO10H (handheld, battery-powered) |
| Resolution | 1 µΩ; 4¾ digits | Not stated on the product page | Not stated on the product page | 0.1 µΩ; 0.01 µΩ with optional module | Not stated on the product page | 0.1 µΩ; 0.01 µΩ with high-precision module (1 – 30 µΩ) | 0.1 µΩ | 0.1 µΩ | 0.1 µΩ |
| Test modes | Measurement method: Four-point Kelvin Operating modes: Standard and differential | Not stated on the product page | Not stated on the product page | SINGLE, CONTIN, BSG and DTRtest | Not stated on the product page | SINGLE, CONTIN, BSG (both sides grounded) and DTRtest | SINGLE and CONTIN; continuity of substation protective bonding | 4-wire Kelvin with cable reels up to 200 m; pass/fail (Rmax); response under 3 s | Not stated in the documentation |
| Memory and communications | Not stated on the product page | Not stated on the product page | Memory: 500 time- and date-stamped measurements Communication: USB; optional RS232 and Bluetooth | Not stated on the product page | Memory: 10000 time- and date-stamped readings Communication: Bluetooth to the PC | 20 × 4 character LCD; 500 time- and date-stamped measurements; USB, RS-232, Bluetooth and USB flash drive | 20 × 4 character LCD; 500 time- and date-stamped measurements; USB, with optional RS-232 and Bluetooth | 2.8" TFT; 10 000 time- and date-stamped measurements (32 GB SD); Bluetooth to PC | 2.8" TFT; 10 000 time- and date-stamped measurements (32 GB SD); Bluetooth to PC |
| Power supply | Six rechargeable NiMH AA batteries | Power supply: 6 rechargeable AA NiMH batteries Autonomy: Over 12,000 measurements at 10 A; over 10,000 at other currents | Not stated on the product page | Not stated on the product page | Replaceable Li-Po; 2 h recharge | 90 – 264 V AC, 50/60 Hz | 90 – 264 V AC, 50/60 Hz | User-replaceable Li-Po, 2 × 4 cells, 1300 mAh; 1 h recharge; over 200 tests at 10 A | User-replaceable Li-Po, 8800 mAh; 2 h recharge |
| Safety and protection | Not stated on the product page | -20°C to 50°C; 0 to 95% humidity, non-condensing | -20 to +55 °C; IP50 | IP67 with the lid closed | Not stated on the product page | IP67 with closed lid; -20 to +55 °C | IP50; -20 to +55 °C; EN 61010-1; EN 61326-1 | EN 61010-1; EN 61326-1:2021; -10 to +55 °C | EN 61010-1; EN 61326-1:2021; -10 to +55 °C |
| Dimensions and weight | 203 × 114 × 51 mm; 0.86 kg | 0.86 kg; 203 × 114 × 51 mm | 198 × 255 × 380 mm; 7 to 8 kg | From 8 to 11.5 kg depending on model | 226 × 116 × 50 mm; 0.95 kg | 503 × 406 × 193 mm; 14.6 kg | 198 × 255 × 380 mm; 8 kg | 226 × 116 × 50 mm; 0.95 kg | 226 × 116 × 50 mm; 0.95 kg |
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Data from the specifications table of each product page and, for units without a product page, from their technical documentation. Missing data is flagged.
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