Eigenschaften
Test voltage	50 - 100 - 250 - 500 - 1.000 V
Range at maximum test voltage	200 GΩ
Measurement range: 50 V	10 kΩ - 10 GΩ
100 V	20 kΩ - 20 GΩ
250 V	50 kΩ - 50 GΩ
500 V	100 kΩ - 100 GΩ
1.000 V	200 kΩ - 200 GΩ
Test current / resolution	0,01 µA - 39,99 µA / 10 nA ; 40,0 - 399,9 µA / 100 nA ; 0,400 - 2,000 mA/ 1 µA
Discharge time (at 25 V)	< 2 s/µF
Dimensions / weight / IP rating	211 x 108 x 60 mm / 850 g / IP 54 / IK 04

The Chauvin Arnoux CA 6526 is a digital insulation and continuity tester, specifically designed for industrial maintenance. The device enables precise insulation resistance measurements up to 200 GΩ and features five adjustable test voltages (50 V, 100 V, 250 V, 500 V, 1000 V), suitable for various application fields. Measurements are performed in accordance with the IEC 61557-2 standard, with the measurement range significantly exceeding the 2 GΩ requirement. Device functions include determination of quality parameters DAR (Dielectric Absorption Ratio) and PI (Polarization Index), which are used to assess insulation quality and are only slightly influenced by current temperature. Test modes include manual measurement, locked test (Lock), timer-based measurement, as well as PI and DAR determination.

Applications

The CA 6526 is intended for preventive maintenance of industrial plants and equipment, to detect premature insulation degradation or damage at an early stage. Applications range from checking electrical installations to diagnosing machines and drive systems. The integrated multimeter function expands the application scope: voltage measurements up to 700 V (TRMS and DC), frequency measurements in the range of 15.3 Hz to 800 Hz, resistance measurements up to 999 kΩ, and capacitance measurements up to 10 µF are possible. Continuity testing is performed with test currents of 200 mA or 20 mA according to IEC 61557, with the 20 mA variant extending battery life. Lead compensation up to 9.99 Ω increases accuracy during continuity testing.

Functions and Equipment in Detail

The device features an illuminated dual digital display, showing the main measurement value as well as the actual test voltage, test current, and timer. A logarithmic bargraph visualizes the insulation resistance. The optical Pass/Fail indicator changes from green to red for non-compliant results, even if the acoustic signal is disabled. The ΔREL function displays the deviation from a stored reference value in numerical value and percentage. The alarm function includes two fixed threshold values and one programmable threshold to define individual test conditions.

Technology Explained Simply

Insulation measurement is performed with an input impedance of 400 kΩ. The accuracy of insulation resistance measurement is ± (3 % + 2 pts), with the measurement range varying according to test voltage: from 10 kΩ to 10 GΩ at 50 V, from 20 kΩ to 20 GΩ at 100 V, from 50 kΩ to 50 GΩ at 250 V, from 100 kΩ to 100 GΩ at 500 V, and from 200 kΩ to 200 GΩ at 1000 V. Frequency measurement is possible in the range of 15.3 Hz to 800 Hz, with a resolution of 0.1 Hz to 399.9 Hz and 1 Hz from 400 Hz, and an accuracy of ± (1 % + 2 pts) or ± (1 % + 1 pt). The test voltage can be displayed with an accuracy of ± (3 % + 3 pts). The test current measurement covers a range of 0.01 µA to 2.000 mA, with a resolution of 10 nA, 100 nA, or 1 µA depending on the range, and an accuracy of ± (10 % + 3 pts). The discharge time at 25 V is less than 2 seconds per microfarad.

Compatibility and Accessories

The device is equipped with a Bluetooth® Class II interface, enabling wireless communication with a PC. The standard software Megohmmeter Transfer (MEG)" allows starting the test from the PC, real-time display of measurement values, graphical representation, and data transfer. The optional software "DataView® enables creation of individual test reports, including test location and operator details. Compatible accessories include a continuity test probe, a remote control probe with light, test leads with 4 mm connectors (1.5 m, 15 A, CAT IV, 1000 V, silicone, red + black), crocodile clips (CAT IV-1000 V, 15 A, red + black), test probes with 4 mm sockets (CAT IV and CAT III, 1000 V, PVC, red and black), and a transport case.

Mounting and Installation

The device is easy to handle and ergonomically designed. The robust housing complies with measurement category 600 V CAT IV and protection rating IP54 / IK04, allowing use in outdoor environments and under dirty working conditions. The magnetic folding stand allows attaching the device to steel surfaces, freeing both hands for measurement. The remote control probe with integrated light facilitates work in dark environments.

Operational Advantages

The CA 6526 offers high measurement accuracy and reliability for insulation testing. The integrated multimeter function reduces the need for additional measuring instruments. Storage of up to 1300 measurement values enables comparison with previous results. Bluetooth connection and software support simplify documentation and evaluation of measurement results. Automatic shutdown after 5 minutes (deactivatable) ensures efficient power supply. Power supply is via six LR6 batteries (AA), with autonomy of approximately 1500 insulation measurements or 3000 continuity measurements under usage of 5 seconds measurement and 55 seconds pause. The no-load voltage for continuity testing is at least 6 V, and the test current is 200 mA (± 0 mA to +20 mA) or 20 mA (± 5 mA). Continuity measurement is performed in the range of 0.00 Ω to 10.00 Ω (at 200 mA) or 0.0 Ω to 100.0 Ω (at 20 mA), with continuity thresholds of 2 Ω, 1 Ω, or a programmable threshold.

Accessories and Alternatives

Compatible accessories include a continuity test probe, a remote control probe with light, test leads with 4 mm connectors (1.5 m, 15 A, CAT IV, 1000 V, silicone, red + black), crocodile clips (CAT IV-1000 V, 15 A, red + black), test probes with 4 mm sockets (CAT IV and CAT III, 1000 V, PVC, red and black), and a transport case. These components support efficient and safe use of the device in various application scenarios.

Ergonomics and Operating Comfort

The device is compact and lightweight, fits comfortably in the hand, and offers high operating comfort. The magnetic folding stand enables hands-free operation. The illuminated dual digital display and logarithmic bargraph ensure clear and quick information delivery. The remote control probe with light facilitates work in dark environments. The Pass/Fail indicator (green/red) directly signals whether the measurement result is within the specified range.

Storage and Networking

The device stores up to 1300 measurement values. The Bluetooth connection enables wireless data transfer to a PC. The software Megohmmeter Transfer (MEG)" supports real-time display, data transfer, and graphical representation of measurement values. The optional software "DataView® enables creation of individual test reports.

Operational Advantages

High measurement accuracy, integrated multimeter function, storage of measurement values, and networking capability via Bluetooth® increase the efficiency and reliability of tests. Automatic shutdown ensures efficient power supply. The robust construction and protection rating IP54/IK04 enable safe use in demanding environments.