Chauvin Arnoux C.A 402

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

The C.A 402 is an analogue AC/DC voltmeter designed for robust and dustproof operation, offering a range of functions and user-friendly features.

Function Description

The C.A 402 serves as both a DC voltmeter and an AC voltmeter. Its design emphasizes simplicity and safety, incorporating a magneto-electric instrument, a single switch for range selection, and an analogue display with an anti-parallax mirror. It features a single input via two safety sockets. The device's versatility is enhanced by its compatibility with numerous CHAUVIN ARNOUX accessories, which can transform it into an ammeter, thermometer, lightmeter, or analogue tachometer.

Important Technical Specifications

DC Voltage:

Ranges: 100 mV, 1 V, 3 V, 10 V, 30 V, 100 V, 300 V, 1000 V (limited to 600V for category III, pollution 2 according to IEC 1010; 1000 V max for category II, pollution 2).
Reading coefficients:
- 100 scale: X 1 (100 mV), X 0.01 (1 V), X 0.1 (10 V), X 1 (100 V), X 10 (1000 V).
- 30 scale: X 0.1 (3 V), X 1 (30 V), X 10 (300 V).
Internal resistance: 2 kΩ (100 mV), 20 kΩ (1 V), 63.2 kΩ (3 V), 200 kΩ (10 V), 632 kΩ (30 V), 2 MΩ (100 V), 6.32 MΩ (300 V, 1000 V). Note: 20 kΩ/V except for the 1000V range (6.32 kΩ/V).
Accuracy: 1.5% of full scale.
Permissible overload (5 seconds): 400 Veff (100 mV, 1 V, 10 V, 30 V, 100 V), 230 Veff (3 V), 600 Veff (300 V), 1500 Veff (1000 V).

AC Voltage:

Ranges: 3 V, 10 V, 30 V, 100 V, 300 V, 1000 V (limited to 600V for category III, pollution 2, IEC 1010; 1000 V rms max for category II, pollution 2).
Reading coefficients:
- 100 scale: X 0.1 (10 V), X 1 (100 V), X 10 (1000 V).
- 30 scale: X 1 (30 V), X 10 (300 V).
- 3 scale: X 1 (3 V).
Internal resistance: 20 kΩ (3 V), 63.2 kΩ (10 V), 200 kΩ (30 V), 632 kΩ (100 V), 2 MΩ (300 V), 6.32 MΩ (1000 V). Note: 6.32 kΩ/V.
Accuracy: 2.5% of full scale.
Permissible overload (5 seconds): 230 Veff (3 V, 10 V), 400 Veff (30 V, 100 V), 600 Veff (300 V), 1500 Veff (1000 V).

Reference Conditions:

Ambient temperature: 23°C ± 2°C
Relative humidity: 40 to 60% RH
Frequency: 45 Hz to 65 Hz
Operating position: horizontal ± 1°
Measurement time: 2 to 3 seconds

Errors (Drifts):

Temperature:
- DC: ± 1%/10°C (except 100mV)
- 100mV range: 2%/10°C
- AC: ± 1%/10°C
Frequency: Operating range from 20 Hz to 100 kHz (refer to response curve for details).

Climatic Conditions:

I Nominal reference range
II Operating range
III Storage range

Adherence to Standards:

Dual insulation equipment.
IEC 1010: Dielectric strength test voltage: 5.55 kVrms between case and short-circuited terminals. 600 Vrms max in relation to earth (cat III, pollution 2). Distance in air and leakage lines: ≥ 12 mm except for terminals.
IEC 68.2.27: Withstands acceleration of 490 m/s² (50 g).
IEC 68.2.32: Undamaged after being dropped from 50 cm.
IEC 68.2.6 (Vibration): Number of cycles: 5. Frequency variations: 10 Hz - 55 Hz - 10 Hz. Peak amplitude displacement: 0.15 mm. Sweep speed: 1 octave per minute.
IEC 529: Watertightness IP 40 - IK 03 to EN 50102.

Electrical Protection:

1 thermistor (PTC) and 2 back-to-back diodes protect the instrument on the 100mV and 1V DC ranges.
Over-capacity components ensure protection for other ranges.
2 back-to-back diodes protect the galvanometer.

Dimensions and Weight:

Dimensions: 165 x 105 x 50 mm.
Weight: 450 g.

Usage Features

Safety Precautions:

Place the instrument in a perfectly stable position (horizontal or at an angle on its fold-away stand).
Ensure the needle is correctly set to the zero mark using the adjustment screw at the center of the instrument.
Verify that leads are connected according to the instrument's polarity.
If the measurement magnitude is unknown, always start with the 1000V range.
A range is correctly selected only when the switch is precisely positioned on that range.
Clean the case with a soft cloth, avoiding solvents.

Measurements Without Accessories (V DC/ V AC):

Connect the instrument in parallel to the power supply of the circuit.
Set the switch to the highest DC or AC range, then progressively reduce the range to achieve maximum needle deflection without hitting the full scale stop.
Read the value on the appropriate DC or AC scale and multiply by the corresponding reading coefficient.

Measurements With HT Probe (V DC):

HT probes extend the C.A 402's capacity for DC voltage measurements up to 30,000 V.
Connect the C.A 402 as per the diagram.
For a 5kV probe, set the switch to the 100mV DC range. For a 30kV probe, set it to the 3V DC range.

Measurements With Shunt (A DC):

With 100 mV test shunts, the C.A 402 can measure DC currents up to 100 A.
Connect the C.A 402 as per the diagram.
Set the switch to the 100mV DC range.

Measurements With Current Clamp (A DC/A AC):

Hall effect current clamps enable safe measurement of currents (up to 1000A DC or AC) without opening the electrical circuit.
Enclose only one wire within the clamp jaws.
Set the switch to the appropriate range.

Measurements With ST2 1000 Temperature Probe (-50°C to 1000°C):

The ST2 1000 probe transforms the C.A 402 into a thermometer using specialized K-type sensors.
Measurements are possible up to 1000°C.
The probe output signal is 1 mV DC/°C.
Set the switch to the appropriate range.

Measurements With 10000 L1 Photoelectric Cell (up to 10000 lux):

The 10000 L1 photoelectric cell converts the C.A 402 into an analogue luxmeter.
Set the switch to the 100 mV DC range.

Measurements With TACHYTRONIC 6 Tachometric Probe (100 to 10000 rpm):

The TACHYTRONIC 6 tachometric probe transforms the C.A 402 into a tachometer.
It performs non-contact measurements via photo-reflection.
The probe output signal is 1mV DC for 1 or 10 rpm, depending on the selected range.
Set the switch to the appropriate range.

Maintenance Features

General Maintenance:

For maintenance, only use specified spare parts. The manufacturer is not responsible for accidents resulting from repairs performed outside its after-sales service or by unauthorized repairers.

Metrological Verification (Calibration):

Regular calibration of all measuring instruments is essential.
For occasional daily use, an annual check is recommended.
For continuous daily use, a check every 6 months is recommended.
For calibration and repair, contact COFRAC accredited laboratories or CHAUVIN ARNOUX subsidiaries/agents.

Repair Under Warranty:

Return the device to the CHAUVIN ARNOUX After-Sales Service in REUX - 14130 PONT-L'EVEQUE - FRANCE.
The guarantee is applicable for twelve (12) months after the date of equipment availability. Repair, modification, or replacement of a part during the guarantee period does not extend the guarantee.

Repair Out of Warranty: