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Chapter II
Portable digital multimeters 21
2. DESCRIPTION
2.1. Selector switch
This multimeter is a standalone, hand-held professional measuring instrument,
capable of measuring the following quantities, accessed by the 12-position rotary
selector switch (10-position : MX 23) :
AC voltage with AC (or TRMS) capacitive coupling (input impedance : 500k)
AC voltage with AC+DC (or TRMS) direct coupling
DC voltage
DC / AC+DC voltage, range 500 mV
AC current with AC+DC (or TRMS) direct coupling (except MX 23)
DC current (except MX 23)
resistance value
continuity (with beeper)
capacitance
diode threshold voltage
frequency
2.2. Keypad
A four-key (two-key : MX 23) keypad lets you :
select the autoranging mode (RANGE / AC+DC key)
store a value (MEM key)
activate the MIN-MAX-AVG detection mode (MIN/MAX key) (except MX 23)
select a function derived from the main function, or switch on the multimeter
again after it has been shut down automatically (RANGE / AC+DC key)
activate back lighting of the display unit ( key) (except MX 23)
2.3. Display
This multimeter display provides :
5 000-count measurements (50 000-count Hz-measurement) selection
function indicator (V, A, AC+DC, F, Hz,
, , , AUTO, MEM, MIN, MAX,
AVG) and multiplicator (n, µ, m, k, M),
battery discharged indicator BAT : approximately 12 hours of operation,
clearly legible figures (11 mm high),
an analogue readout of the parameter being measured through a 34-segment
bargraph.
The « » symbol displays when the multimeter is in standby mode (the
multimeter goes off after 30 minutes without any action on key).
Display backlight when required in poor lighting conditions.
2.4. Power supply
This multimeter is powered by a standard 9 V battery (6LF22) which provides
approximately 250 hours of operation (on function V
DC).
2.5. Input terminals
Measurements are performed using two measuring leads supplied with the instrument
connected to input terminals 1, 2, 3 and 4 (3 and 4 : only MX24 and MX 24B) as
indicated in section 3.1.
9


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