Brochure

Greater comfort thanks to the Multix 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!
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, owing through the ame
between the ionization probe and the earth, controls the gas supply. If there is a combustion
problem, the absence of any ame means there is no current so it triggers the fail-safe to shut
down the installation.
V
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+/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 signicant. 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.