Specifications: CM57-2 Flexible Clamp Meter
Measurement & Analysis
AC Current Bandwidth
45–500 Hz (sine wave)
AC Current Ranges and Resolution
30.00 A, 300.0 A, 3000 A
AC Response
True RMS
Basic AC current accuracy (of reading)
±3.0% + 5 digits
Display Rate
2 times per second
Flex Coil Length
45 cm (18 in)
Flex Coil Tip Diameter
13 mm (0.5 in)
Inrush Current
Minimum 0.5 A, 100 mS
Max Conductor Diameter
12 cm (4.7 in)
Maximum AC current
3000 A AC
Maximum resolution
0.01 A
Measurement Rate
1.5 samples per second, nominal
Positional Error [distance from optimum]
35 mm (1.4 in) ±1.0%, 50 mm (2.0 in) ±1.5%, 60 mm (2.4 in) ±2.0%
Communication & Data Storage
Bluetooth range max
10 m (32 ft)
Data Record Mode
20,000 points; 1 minute sample rate
Wireless ID# max
Up to 20
User Interface
Display
3000-count LCD with backlight and multi‐function indicators
Power
Auto Power Off
Approximately 10 minutes
Battery life
100 hours with alkaline batteries (calculated)
Battery type
2 x 1.5 V AAA
General
Coil Bend Radius
80 mm (3.1 in)
Coil Diameter
7.5 mm (0.3 in)
Display Indications
Progressive low battery, over range, hold
Maximum Conductor Diameter
12 cm (4.7 in)
Size [L × W × H]
330 mm × 175 mm × 28.45 mm ( 13 in × 6.89 in × 1.12 in)
Weight
233 g (0.51 lb) with batteries
Worklights
2x LEDs
Environmental & Certifications
Certifications
UL, CE, FCC, IC, UKCA, CSAUS
Drop test
3 m (9.8 ft)
IP Rating
IP54 dust-protected and splash-resistant
Operating Altitude
2000 m (6562 ft) max
Operating Humidity
Maximum 80% up to 35°C (95°F) decreasing linearly to 60% at 45°C (113°F)
Operating Temperature
0°C to 50°C (32°F to 122°F)
Safety Rating
CAT IV-600 V, CAT III-1000 V
Standards
Safety (UL):
IEC 61010-1:2010, IEC 61010-2-032:2012
EMC (FCC):
47 CFR Part 15 Subpart B
EMC (CE):
EN IEC 61326-1:2021
EN IEC 61326-2-2:2021
EN 301 489-1 V2.2.3 (2019-11)
EN 301 489-17 V3.2.4 (2020-09)
RF:
ETSI EN 300 328 V2.2.2
EN 62479:2010
EN 50663:2017
Storage Humidity
80% relative humidity (maximum)
Storage Temperature
-20°C to 60°C (-4°F to 140°F) without batteries
Temperature Coefficient
0.2 × specified accuracy/°C, <64.5°F (18°C), >82.4°F (28°C)