The voltage tester CA 773 from Chauvin Arnoux is a professional measuring instrument for verifying the absence of voltage in electrical installations connected to the power distribution network. It serves as an aid for electricians to ensure, before working on circuits, devices or installations, that no dangerous voltage is present. The device complies with the standard IEC 61243-3 and is approved for installations up to 1000 V CAT IV in indoor and outdoor environments. The IP65 protection rating ensures high resistance to dust and water, enabling use under harsh conditions. The operating temperature ranges from -15 °C to +45 °C (climate protection class N). The autonomy exceeds 2500 measurements at 10 seconds each, indicating high battery efficiency.

Applications

The CA 773 is designed for all work on low-voltage installations below 1000 V CAT IV. It is suitable for both indoor and outdoor applications, particularly in areas with increased humidity or dust exposure. Its compliance with standards and integrated safety functions make it a reliable tool for daily use in electrical trades. Testing is performed in accordance with the requirements of 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, which precisely shows measurement values. Voltage detection occurs in the range of 12 V AC to 1000 V AC and 12 V DC to 1400 V DC, with frequency coverage from DC to 800 Hz (16 2/3 Hz to 800 Hz). The impedance is greater than 500 kΩ, and the maximum current is 3.5 mA RMS. Polarity indication is integrated, as is phantom voltage detection via switching to a low-impedance load. Residual current device tripping is tested by switching to a low-impedance load, achieving a tripping threshold of approximately 30 mA at 230 V.

Technology Explained Simply

A redundant safety system is implemented via the ELV-LED, which flashes at voltages above 50 V AC or 120 V DC. The flashing frequency is proportional to the applied voltage, providing a visual warning for dangerous voltages. Single-phase phase detection works from 50 V (45–65 Hz) or 150 V (16–45 Hz) and identifies the live conductor by touching a single conductor. Phase rotation is determined using a 2-wire method via a microprocessor, eliminating the need for a third hand. Continuity testing is performed with optical and acoustic indication; the buzzer activates at a resistance below 100 Ω (typical) or up to 150 Ω. Extended continuity testing displays resistances from 0.5 Ω to 2.999 kΩ. The test current is up to 1 mA, and the open-circuit voltage is ≤ 3.3 V.

Compatibility and Accessories

The test probes and test leads are detachable, allowing replacement with models that meet specific national regulations, such as IP2X versions. As an option, the socket adapter CA 753 is available, simplifying testing of 2P+E European sockets and Schuko sockets. Compatible accessories include protective caps for test probes (Ø 2 mm, 10 pieces), a set of 2 test probes CAT IV, a set of 2 test probes Ø 2 mm, a carrying case (120 x 320 x 60 mm), a set of 2 test probes IP2X CAT IV, a set of 2 test probes Ø 4 mm, and probe protective caps.

Mounting and Installation

The device is immediately ready for use, as it is delivered fully assembled. The test probes and test leads are pre-installed and can be replaced if necessary. Operation is performed via buttons designated for various functions. The self-test function checks the electrical circuits, power supply, displays, and condition of the test leads. Testing of residual current circuit breaker tripping requires two-hand operation to ensure additional safety.

Operational Advantages

The CA 773 offers high safety through redundant displays, integrated self-test, and phantom voltage detection. The digital display enables precise measurement value representation, while the LED display provides quick visual orientation. The 2-wire method for phase rotation reduces operational effort. Extended continuity testing with resistance indication from 0.5 Ω to 2.999 kΩ offers additional diagnostic capabilities. High autonomy and robust construction with IP65 protection rating make the device a reliable companion in daily use.

Standards and Safety

The device complies with standards CEI 61243-3:2009, EN 61243-3:2010, and CEI 61010 for 1000 V CAT IV. Safety functions are designed according to the requirements of the standards, particularly continuity testing conforms to recommendations in Annex B of the standard. Testing of residual current circuit breaker tripping is performed via a simulated fault current activated through the dual-function button.

Delivery Contents

The device is delivered fully assembled and ready for use. The test probes and test leads are installed. The statement “complete, ready-to-use delivery” refers to the standard equipment of the device without additional accessories. Batteries are not included in the delivery contents.