Chapter II
Portable digital multimeter
29
4.2. RANGE
key
•
AUTO mode to switch to MANUAL mode (short press).
•
MANUAL mode, to select the next range (short press) or return to AUTO mode (long press).
Measurements concerned : voltages (except 500 mV range), capacitance, resistance,
current (except 10 A range).
•
When making time measurement (frequency, duty cycle) : if the range change made during
previous measurements (Voltage or Current) was in manual mode, it may be necessary to
adapt this measurement range to the signal level injected at the input. This is why the
RANGE key is used to change from one range (Voltage or Current) to the next range. The
new range is then displayed for 2 seconds.
4.3. REL
key
Short press
:
REL mode, the last value measured becomes the reference value derived from
subsequent measurements. In temperature measurement the REL key used to
compensate the connexions resistance (refer to §. 4.1.7.).
Long press :
When in REL mode, a long press displays the reference being used. This
value may be adjusted using the SEL/ON key (selection of digits and a
sign) and the RANGE key (increment the selected digit).
4.4.
Pk +/- key
The fast positive or negative peak measurement functions (
≥
1 msec.) can be accessed by
repeatedly pressing this key in the V
DC
, mV
DC
, mA
DC
and 10 A
DC
functions.
4.5. HOLD
key
Short press :
Fixes the display on the current value.
Long press :
Accesses or quits the “autostore” mode. Can be accessed in the V
DC
, mV, V
AC
positions.
Autostore
Set the probes on the point to be measured. An audio signal indicates if the measurement is
stable. When you remove the probes, a second audible signal indicates that this stable value
displayed has been stored.
4.6. ZOOM
key
You can press this key to expand the bargraph readout five times for positive measurements and
eleven times for bipolar measurements, one centred around zero (centre zero mode).
Adjusts ohm-value references in dB and audio power measurements.
When the current measurement is dB or audio power, you can display the resistance reference
with the ZOOM key (long press). This value can then be adjusted using the SEL/ON and RANGE
keys. You quit the ohm reference adjustment mode with the ZOOM key (short press).
