The CA 773 voltage tester from Chauvin Arnoux is a two-pole, standard-compliant testing device for verifying the absence of voltage in electrical installations. It serves electricians and specialists as a reliable tool before working on network-connected circuits, devices, or installations. The device complies with the standard IEC 61243-3 and is approved for installations up to 1000 V CAT IV, both indoors and outdoors. The safety class CAT IV 1000 V allows use at main distribution boards and other high-load installations, while the protection rating IP65 makes it dust- and splash-proof, enabling use under harsh conditions.

Applications

The CA 773 is used in electrical installation, maintenance work, and safety inspections. It is designed for voltage and phase testing, rotation field direction detection, continuity testing, and testing of residual current devices (RCDs). These functions are particularly useful for testing sockets, wiring, distributors, and other electrical components. Testing is carried out in accordance with the standards EN 50110-1, DIN VDE 0682-401, and NF C 18-510.

Functions and Equipment in Detail

The device features a combination of LEDs and a backlit digital display that accurately shows measurement values. Voltage detection is performed in the range of 12 V AC to 1000 V AC and 12 V DC to 1400 V DC. Frequency ranges include direct current (DC) and alternating current from 16 2/3 Hz to 800 Hz. A redundant safety function is provided by the ELV-LED, which starts flashing at voltages of 50 V AC or 120 V DC, with the flashing rate increasing proportionally to the voltage. This serves as an additional warning for hazardous voltages.

Technology Explained Simply

The tester detects phantom voltages by switching to a low-impedance load, activated by pressing a dual-function button. Phase detection is single-pole, starting at 50 V (45–65 Hz) or 150 V (16–45 Hz). Rotation field direction testing is performed using a 2-wire method controlled by a microprocessor, eliminating the need for a third hand. Continuity testing detects continuity from approximately 100 Ω (maximum 150 Ω) and is acoustically signaled by a continuous beep. Extended continuity testing displays resistances from 0.5 Ω to 2.999 kΩ. RCD tripping testing is performed with a fault current of approximately 30 mA at 230 V and requires two-hand operation for safety.

Compatibility and Accessories

The CA 773 is equipped with removable test probes that can be exchanged depending on the application. Test probes are available in various versions, including models with 2 mm Ø, 4 mm Ø, IP2X protection, or CAT IV approval. Additionally, protective caps for test probes, transport cases, and an optional socket adapter C.A 753 are available, enabling testing of 2P+T sockets according to European standards (Type E and F).

Mounting and Installation

The tester is connected directly to the conductors to be tested. The test probes are inserted into the corresponding contacts, with the device featuring clip positions for spacings of 16 mm or 19 mm. Operation is performed via buttons on the device, with the integrated self-test checking all electrical circuits, power supply, displays, and test leads for proper condition. Errors are displayed in text form.

Operational Advantages

The CA 773 offers high safety through multiple redundant functions, including the ELV-LED and self-test. The digital display enables precise measurement values, while the LED display provides quick visual orientation. Autonomy exceeds 2500 measurements at 10 seconds each, ensuring long operating time without battery replacement. The climate class N (−15 °C to +45 °C) allows use under normal ambient conditions. Removable test probes increase flexibility and adaptability to various requirements.

Scope of Delivery

The scope of delivery includes the CA 773 voltage tester, removable test probes and test leads, and the operating instructions. Batteries are not included in the delivery.