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CR.20A

The CR.20A is a versatile, high-precision resistance tester designed for transformer DC resistance testing, winding resistance, ground grid continuity, switchgear contact resistance, cable resistance, and general low-value resistance applications. With selectable test currents up to 20 A and resolution down to 0.1 μΩ, it delivers accurate results across a wide resistance range from 10 μΩ to 1000 kΩ.

Built on the four-wire Kelvin measurement principle, the CR.20A ensures high accuracy by eliminating lead and contact resistance effects. Advanced features include temperature compensation with internal and external sensors, large data storage, Bluetooth/USB connectivity, integrated printer, and mobile app support. Compact, lightweight, and battery-powered, it is suitable for both field and laboratory use.

Function

• Wide resistance testing range: 10 μΩ to 1000 kΩ
• Four-wire Kelvin measurement eliminates lead resistance errors
• Selectable test currents: 20 A, 10 A, 5 A, 1 A, 0.1 A, 10 mA, 1 mA
• Temperature monitoring and conversion (to 75 °C reference)
• Data storage for up to 800 groups with review function
• Integrated thermal printer for onsite reporting
• Bluetooth mobile app and USB PC connectivity for data management
• Built-in lithium battery with real-time battery status display
• Overload protection, automatic discharge, and adjustable auto shutdown
• Compact and lightweight design for portability

Technical Specifications

resistance range

  • 10 μΩ – 1000 kΩ

resolution

  • 0.1 μΩ

detection method

  • Four-wire Kelvin test

test currents

  • 20 A, 10 A, 5 A, 1 A, 0.1 A, 10 mA, 1 mA

short circuit current

  • 20 A

temperature check

  • Dual sensors: internal and external probe

  • Temperature conversion to 75 °C reference

overload protection

  • Yes

automatic discharge

  • Yes

display

  • 5-inch full-colour LCD touchscreen (854 × 480)

  • Size: 108 × 65 mm

interactive mode

  • Touchscreen and physical buttons

printer

  • Built-in thermal printer with print button control

data storage

  • 800 groups with review function

interfaces

  • USB for PC connection

  • Bluetooth mobile app support

battery

  • DC 14.6 V, 12,000 mAh lithium battery

  • Real-time battery voltage monitoring

  • Built-in charging function

automatic shutdown

  • Off, 5–30 minutes (selectable)

power consumption

  • Standby: ~4 W (30 % brightness)

  • Measurement: 100 W max

safety & compliance

  • IEC 61010-1, CAT III 600 V, pollution degree 2

  • JJG724-1991, JJG166-1993, DL/T967-2005 standards

dimensions

  • 277.2 × 227.5 × 153 mm

weight

  • Meter: 3.1 kg (with battery)

  • Test leads: 0.85 kg

operating conditions

  • Temperature: -10 °C to +40 °C

  • Humidity: ≤70 % RH

storage conditions

  • Temperature: -20 °C to +60 °C

  • Humidity: ≤70 % RH

insulation resistance

  • 10 MΩ (500 V between circuit and shell)

dielectric strength

  • AC 3700 V RMS (between circuit and case)

Key Features

  • Wide resistance range from 10 μΩ to 1000 kΩ

  • Resolution down to 0.1 μΩ

  • Seven selectable test currents up to 20 A

  • Temperature monitoring and conversion functions

  • Bluetooth mobile app + USB PC connectivity

  • Built-in printer for instant reporting

  • Automatic discharge and overload protection

  • Real-time battery monitoring with high-capacity lithium battery

  • Rugged, lightweight, and portable design

Standard Accessories

  • CR.20A tester unit

  • 5 m test leads (1 red, 1 black)

  • External temperature probe

  • Power adapter/charging cable

  • USB cable

  • Carrying case

  • User manual

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