General
directions
4
6,000- and 60,000-count digital multimeters
General directions (continued)
Safety feature
•
It is impossible to open the battery or fuse compartment without first
disconnecting the measurement leads.
•
During a measurement exceeding 60V
DC
or 25V
AC
the
symbol blinks on
the display unit
•
Automatic detection of a connection to the "Ampere" terminal (for both
voltage and current measurements)
•
When the maximum permanent voltage or current that can be measured is
exceeded, an intermittent audible signal warns of the risk of an electric
shock.
Features
protecting the
measurement
inputs
These multimeters have several features to protect them:
•
varistor protection that clips transient voltage surges on the
measurement terminals.
•
PTC (Positive Temperature Coefficient) protection against permanent
overvoltages less than or equal to 1000V during resistance,
capacitance, and diode test measurements.
This protection is reset automatically after the overload.
•
a fuse that provides protection during current measurements.
-
MTX 3290
: 10A
-
MTX 3291
: 11A
Special functions
Automatic
detection
The number of input terminals is limited to 3:
V
,
COM
,
A
. Connecting the
lead to the "Ampere" terminal automatically selects the corresponding
function.
*
When a change of function by the command keypad is
incompatible with the connection of the lead, it triggers an
audible or visual (LEADS) alert.
The current measurement is made with automatic peak range full-scale.
During a current measurement, an audible alert is triggered in the event of a
prolonged absence of current.
Automatic
switching off
If the function is validated ( ), the device is automatically switched off after
30 mn of operation if there has been no action on the front panel during this
time.
*
Automatic switching off is disabled:
-
in the MAX, MIN, AVG, PEAK Surveillance mode
-
in the Communication mode
-
if there is a voltage >60
V
DC
or 25
V
AC
on the terminals of the
multimeter.
Warning
signals
An intermittent audible signal is emitted in all "Voltage" and "Current" settings if
the max. permanent value the device can measure is exceeded. It is
accompanied by display of the "
O. L
" acronym and of the
symbol on the
display unit.
This symbol is activated when the voltage on the "
V
" input exceeds 60V
DC
or
25V
AC
in the "
Voltage
" setting or when the current injected between the
A
and
COM
terminals exceeds 10A.
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