Eigenschaften
Impedance	400 kΩ
Dimensions / weight	180 x 52 x 45 mm / 200 g

The CA 745N from Chauvin Arnoux is a digital voltage tester with integrated continuity and resistance testing, specifically designed for use in electrical installations up to 600 V CAT III. The device features an LCD display that shows voltage values in the form of a bar graph, and enables automatic detection of AC and DC voltage. Testing is performed at seven threshold levels from 12 V to 690 V, with a voltage protection limit up to 1100 V. The input impedance of 400 kΩ ensures high safety during measurement, particularly when testing between live conductor and earth, thus avoiding the risk of triggering sensitive residual current devices.

Applications

The CA 745N is suitable for professionals in electrical contracting, heating and air conditioning technology, as well as maintenance technology. It is used for safe testing of electrical installations, particularly for checking phase conductors, neutral conductors, and the continuity of connections. The single-pole phase testing allows identification of the live conductor with only one test probe, which speeds up the workflow and increases safety. The polarity detection function displays «+» and «−» symbols to determine the polarity of DC sources.

Functions and Equipment in Detail

The device features an acoustic continuity test, which emits a beep tone when resistance is below 2 kΩ. Resistance testing is performed at three threshold levels from 2 kΩ to 300 kΩ. At voltages above 50 V, a beep tone is activated, and at voltages above 100 V, a «Ph» diode flashes and an intermittent beep tone signals detection of a live conductor. The battery status indicator informs the user about the charge level of the two 1.5 V LR03 batteries. The operational autonomy is 150 hours when using alkaline batteries.

Technology Explained Simply

The CA 745N operates with an input impedance of 400 kΩ, ensuring high safety during measurement, as the current flow through the device is kept to a minimum. Automatic detection of AC and DC voltages occurs without manual adjustment, simplifying operation. Display is via an LCD screen with a bar graph, visualizing voltage in seven stages. The protection rating IP54 protects the device against dust and splashing water, making it suitable for indoor use. Operating frequencies include DC as well as 50/60 Hz, enabling use in various power networks.

Compatibility and Accessories

The device is equipped with removable test probes, stored in an integrated compartment within the housing. It is compatible with various accessories, including test probes in different sizes and categories (CAT III/IV, CAT II), hook-and-loop straps, a carrying case, and a multi-purpose magnetic holder MultiFix. These accessories facilitate the use and storage of the device.

Mounting and Installation

The CA 745N is connected directly to the conductors to be tested. The removable test probes allow flexible adaptation to different connection types. Testing is performed by touching the conductors with the probes, with the display and acoustic signals indicating the results. Mounting requires no special tools, as the device is operated manually.

Advantages in Operation

The CA 745N offers high safety due to its high input impedance and avoidance of triggering residual current devices. Single-pole phase testing and automatic voltage detection increase efficiency. The long operating time of 150 hours and compact design with dimensions of 180 x 52 x 45 mm and a weight of 200 g make the device a practical tool for daily use. The integrated battery status indicator ensures the user is always informed about the charge level.

Standards and Safety

The device complies with standards CEI 61010 and IEC 61010-2-033 for electrical safety in installations up to 600 V CAT III. The protection rating IP54 ensures protection against dust and splashing water, enabling indoor use. Operating conditions include a temperature range of -10 °C to +55 °C and relative humidity from 10 % to 80 %.

Scope of Delivery

The device is delivered in blister packaging and includes a set of thin test probes red/black CAT III/CAT IV, two alkaline batteries 1.5 V AAA / LR3, and an instruction manual in five languages.