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C.A 5277
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CHAUVIN ARNOUX C.A 5277 [3/4] Accurate measurements useful functions and a range of great features

12-bit TRMS fast acquisition

& 5 measurements per second

The signals measured may be distorted or disturbed. This type of acquisition ensures

top-quality results whatever their form or nature.

Measurement of the ionization current

Boiler maintenance and gas-burner combustion testing require measurement and adjustment

of the ionization current. The presence of this current of a few μA DC, ﬂowing through the ﬂame

between the ionization probe and the earth, controls the gas supply. If there is a combustion

problem, the absence of any ﬂame means there is no current so it triggers the fail-safe to shut

down the installation.

LowZ

low-impedance voltage measurement

Proximity to live circuits or conductors may cause a capacitive effect leading to the presence

of an induced voltage on an open, powered-down circuit. The high impedance of a classic

voltmeter which does not eliminate these spurious charges will lead to erroneous detection

of a voltage. The low-impedance setting on the multimeters in the C.A 5270 Series, specially

designed for electricians’ needs, will give a true result: there is no voltage in the circuit.

TRMS MIN / MAX

The MIN and MAX measurements are true root-mean-square (TRMS) values calculated over

a 100 ms period. They represent the variation range of the electrical quantity measured.

It is these values which are used to size an installation, the diameter of a power cable

or the rating of a protective device (fuse, disconnector, etc.).

1 ms Peak±

The Peak+ and Peak- values, calculated over a period of 1 ms, characterize the distortion of the

measured quantity’s waveform. In the event of a sinusoidal power source, high values for these

two quantities are indicative of changes in the installation’s behaviour and, in certain cases,

malfunctions. If the ratio between the RMS value and the Peak value is other than 1.4, it may

indicate the presence of harmonic disturbances.

Relative and differential measurements

Comparison with a known reference standard or with a quantity of reference is often a good

way to make a quick assessment and analysis. The ∆REL differential measurement function

can be used to measure the difference in relation to the reference value. The ∆REL/R % relative

measurement function places the quantity in its context.

Expressed as a proportion of the reference value, the same value may thus appear negligible

or highly signiﬁcant.

These functions can be applied simultaneously to all the types of measurements and can also

be coupled with the Min, Max, Peak- and Peak+ analysis functions.

Extended HOLD

Unlike the usual HOLD function which simply freezes the value displayed, the HOLD function

on the C.A 5270 Series multimeters stores all the parameters of a measurement. In this way,

depending on the measurements and functions activated, it is possible to view the Min,

Max and Peak values as they stand, or in differential or relative terms.

Greater comfort thanks to the Multiﬁx multi-position

mounting accessory!

Fixed to your belt, to a door or in a cabinet, this little

accessory clips onto the back of your multimeter and allows

you to work hands-free.

Accurate measurements, useful functions

and a range of great features!

CHAUVIN ARNOUX C.A 5277 [3/4] Accurate measurements useful functions and a range of great features

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