DeltaOHM HD31, Operating Manual

Page: 12 / 154

HD31
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V1.6
3 MEASUREMENT MODE
Switching on and off the instrument is obtained by pressing the ON/OFF key.
Fig. 3.1: ON/OFF key
At startup, the instrument checks for the probes connected to inputs and, after a few seconds,
goes to the standard measurement mode, displaying the measured quantities. The instrument
displays three measurement lines at the same time.
The quantities appearing on the display are identified by the letter (A, B or C) corresponding to
the input channel connected to the probe measuring the quantity, followed by a sequential
number helping to differentiate the various quantities measured by the same probe (combined
probes) or any derived quantities.
When the instrument is first switched on, it lists the available quantities depending on the
number and type of the connected probes, choosing among A1, B1, C1, A2, B2, C2, A3, B3,
C3.... For instance, if input A is connected to a humidity/temperature combined probe, and in-
put B to a Pt100 probe, the automatic configuration will organize the display as follows:
• First line (A1): relative humidity in %RH;
• Second line (B1): temperature of the Pt100 single probe;
• Third line (A2): temperature of the combined probe.
By default, derived quantities are not displayed; see paragraph 3.4. for their display.
If there are more than three quantities, use
S
and
T
keys to cyclically scroll upward or down-
ward the list of the available quantities. During the scrolling operation, a small sequential
number appears over the quantity identifier, marking the position of the measurement in the
list.
Fig. 3.2: measurements display
With the next switch-on, the instrument displays the list of the quantities as it appears at
switch-off.
Measurement unit
of the quantity
Measurement position
in the displayed list
(during scrolling only)
Quantity
identifier
Measured value