General instructions
100,000-count Graphical Multimeters
5
General instructions (cont’d)
Measurement input
protection systems
These multimeters are equipped with several protection systems:
Varistor protection clips any transient overvoltages on the measurement
terminals.
PTC (positive temperature coefficient) protection protects against permanent
overvoltages less than or equal to 1000 V during capacitance or resistance
measurements and diode tests.
This protection is reset automatically after the overload.
A fuse (11 A) provides protection during intensity measurements.
Special functions
Automatic current
measurement
detection
The number of input terminals is limited to 3:
V
,
COM
,
A
. Connection of the lead
to the "
A
mpere" terminal automatically selects the corresponding function.
When a function modification by the control keyboard is incompatible
with the lead connection, it triggers a buzzer and a visual alarm (LEADS).
The current measurement is performed using autorange over the whole range.
Auto power-off
If the function is validated in the Sleep menu: the instrument shuts down
automatically after 30 minutes if no action has occurred on the front panel during
that time.
The instrument can be powered up again by pressing the
key.
Automatic power-off is inhibited in:
Surveillance mode (SURV)
Memorize mode (MEM)
Communication mode (optical link - RS232C, USB, Bluetooth)
when the value measured (Voltage or Current) on the multimeter's
inputs exceeds the danger level.
Alert signal
Danger threshold
An intermittent buzzer sounds:
on the "Voltage" position, when the range is exceeded (
MANUAL
and
AUTO
mode - last range)
on the "Current" position, when the range is exceeded (
MANUAL
) mode,
when 10 Amperes or more is measured
if the position of the leads and the function selected are incompatible
when the danger thresholds are exceeded (function activated)
When the range is exceeded, the buzzer is accompanied by display of "
O. L
".
When this symbol is activated:
the voltage on the "
V
olt
"
input exceeds
60 V
DC
or
30 V
AC
the current injected between the "
A
mpere
"
and
COM
exceeds
10 A
the range is exceeded (voltage or current) in
MANUAL
mode
