Presentation; The Megohmmeter; Accessories - Chauvin Arnoux C.A 6549 Mode D'emploi

1.1. C.A 6549 MEGOHMMETER
The C.A 6549 megohmmeter is a top-of-line measuring instrument, portable, in a rugged construction-
site housing with cover, with a graphic screen, operating from battery or line power.
Its main functions are:
§
automatic detection and measurement of voltage / frequency / input current,
§ quantitative and qualitative insulation measurement:
- measurement at 500/ 1000/ 2500/ 5000V DC or other test voltage between 40 and 5100 V DC
("adjustable voltage"),
- measurement in voltage step mode (the applied voltage increases in steps),
- automatic calculation of DAR/PI and DD (dielectric discharge index) quality ratios,
- automatic calculation of measurement result referred to a reference temperature.
§ automatic capacitance measurement,
§ automatic measurement of residual current.
This megohmmeter helps ensure the safety of electrical installations and equipment.
Its operation is controlled by microprocessor for the acquisition, processing, and display of measurements
and the storage and printing of results.
It has many advantages, among them:
- digital filtering of insulation measurements,
- automatic voltage measurement,
- automatic detection of external AC or DC voltages on the terminals, before or during insulation
measurements, disabling or stopping the measurements when measurement accuracy is no longer
guaranteed,
- threshold programming to trigger audible alarms,
- timer for measurement time checks,
- protection of the instrument by fuse, with detection of defective fuses,
- operator safety by automatic discharge of residual high voltage on the equipment tested,
- automatic shutdown of the instrument to save battery power
- battery charge indication,
- large backlit graphic display unit that is very easy for the user to read,
- Memory (128 KB), real time clock, and serial interface
- PC control of the instrument (using the optional DataViewer Pro software)
- Printing in RS 232 or Centronics mode.

1.2. ACCESSORIES

§
Measuring cables
The megohmmeter is delivered with 4 measuring cables as standard:
- 2 3m safety cables (red & black with rear pick up), with an HV plug for connection to the instrument and
an HV alligator clip for connection to the item tested
- 2 blue cables (3m and 0.3m with rear pick up) to measure high insulation values (cf. § 5.1).
Optionally, you can order the same cables in lengths of 8m and 15m, and also simplified cables (the
crocodile clip is replaced by a 4mm banana jack in which standard crocodile clips or contact pins can be
connected).

1. PRESENTATION

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