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True RMS - AC Clamp Meter
- AC measurement method: True RMS
- Designed to accommodate larger-diameter wires without compromising ease of use
- Built tough for use in the field
- Ability to measure up to 2000 A AC using either the mean rectification method or the true RMS method
- Ability to measure both current and voltage
Description
Hioki CM3291 - AC Clamp Meter
- Built tough for use in the field
- Ability to measure up to 2000 A AC using either the mean rectification method or the true RMS method
- Ability to measure both current and voltage
- Designed to accommodate larger-diameter wires without compromising ease of use
Enhancement Of The Popular Low-Profile Design
The previous AC Clamp Meter CM3289 (33 mm, rating of 1000 A AC) featured a low-profile design that was engineered to enable users to clamp around wires easier. The new instruments build on that product's design by increasing both the jaw diameter (46 mm) and the current capacity (by increasing the rating to 2000 A AC). Both new models preserve the CM3289's ease of use so that thick cables (paired wires, etc.)1 are easily measured.
Hioki has redesigned the jaw (sensor) profile as part of an effort to expand its clamp meter line with models that are easier than ever to clamp around wires. The newly designed clamp meters have won broad praise, including an honorable mention in the 58th Product Competition at Electrical Construction Equipment and Materials (JECA) Fair 20192 and a 2019 Good Design Award3.
Although Hioki has recently updated many of its clamp meters, up until now only one low-profile model has been capable of measuring thick cables (paired wires, etc.). To address this issue, Hioki developed the CM3281 (mean value rectification method) and CM3291 (true RMS method) to enlarge the 33 mm diameter and 1000 A AC current rating of the AC Clamp Meter CM3289 to 46 mm and 2000 A AC, respectively.
Improve work efficiency Get jobs done faster
Essential equipment for professional electricians. Measure current and voltage with a single test tool.
Manuals/Guides
- Hioki AC Clamp Meter CM3281 and CM3291 - Catalog
Manufacturer Specs
| General Specifications | |
| AC measurement method | CM3281: MEAN Value CM3291: True RMS |
| Core jaw diameter | Φ 46 mm (1.81 in), jaw thickness: 8.3 mm (0.33 in) |
| Max. rated voltage to earth | Jaw: CAT IV 300 V, CAT III 600 V Voltage measurement terminal: CAT III 300 V, CAT II 600 V |
| AC current | 42.00 A/ 420.0 A/ 2000 A (±1.5% rdg.±5 dgt.) |
| Frequency characteristics | CM3281: 50 Hz to 60 Hz CM3291: 40 Hz to 1 kHz |
| AC voltage | 4.200 V to 600 V, 4 ranges (±1.8% rdg.±7 dgt.) |
| Frequency characteristics | 45 Hz to 500 Hz |
| DC voltage | 420.0 mV to 600 V, 5 ranges (±1.0% rdg.±3 dgt.) |
| Resistance | 420.0 Ω to 42.00 MΩ, 6 ranges (±2.0% rdg.±4 dgt.) |
| Continuity check | 420.0 Ω (±2.0% rdg.±4 dgt.) Threshold of buzzer sound 50 Ω ±40 Ω or less |
| Crest factor (Only for CM3291) | 2.5 at 2500 count or less (linearity reduced to 1.5 or less at 4200 counts), (1.5 or less at 2000 A range) |
| Display refresh rate | 400 ms |
| Operating temperature and humidity | -25°C to 65°C (-13°F to 149°F), 80% RH or less (no condensation) |
| Storage temperature and humidity | -25°C to 65°C (-13°F to 149°F), 80% RH or less (no condensation) |
| Drop-proof distance | 1 m (3.28 ft) onto concrete |
| Standards | Safety: EN 61010, EMC: EN 61326 |
| Functions | Data hold, Auto power-saving function |
| Power supply | Coin type lithium battery CR2032 × 1 |
| Continuous use | CM3281: 120 hours, CM3291: 70 hours |
| Dimensions and mass | 57 mm (2.24 in)W × 197.5 mm (7.78 in)H × 16 mm (0.63 in)D, 100 g (3.5 oz) |
| Accessories | Carrying Case, Test Lead L9208, Coin type lithium battery CR2032, Instruction Manual, Operating Precautions |
Tech Specs
Clamp Meters/Clamp Meters Template | |
|---|---|
| True RMS | Yes |
| Maximum Current AC | 2000 A |
| Maximum Voltage AC | 600 V |
| Maximum Voltage DC | 600 V |
| Maximum Conductor Size | 1.81 IN |
| Resistance | Yes |
Test Equipment General Attributes | |
| Warranty | 3 YEARS |
| Warranty Details | Basic accuracy figures for measurement ranges are indicated in parentheses. Accuracy guaranteed for 1 year, Post-adjustment accuracy guaranteed for 1 year, Product warranty period is 3 years. |
| Product Weight | 0.22 LBS |
| Product Height | 7.78 IN |
| Product Length | 0.63 IN |
| Product Width | 2.24 IN |
| Battery Type | Other |
| Power Supply Voltage | Battery Powered |
| Country of Origin | Japan |
As an important international instrument sales platform, our company has the authorization qualifications of many international first-line brands. Relying on the advanced digital information management platform and international procurement platform, we provide more than 100,000 instruments, industrial MRO products, industrial products and spare parts to global customers. Our business scope: industrial testing, non-destructive testing, gas testing, electrical testing, laboratory testing, water quality testing, environmental testing, medical testing...
So far, we have become an important partner of many global top 500 companies and well-known local Chinese companies. Create an efficient supply chain system to provide customers with strong supply guarantee.
