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ENGLISH
– 31 –
PROBE CONNECTION
The HD 9021 may be fitted with either one or two probes; the instrument
has two DIN 45326 8-pole inputs, input A and input B. If only one input is
used, be careful when using the keys for input A or B.
The instrument recognizes the type of probe connected, which is distingui-
shed by a suitable code; it then gets ready to take the measurement accor-
ding to the characteristics of the probe connected. The connectors are
polarized and it takes a certain effort to insert or remove them; proceed in
such a way as to avoid damaging the connector, do not pull the cables to
disconnect the probe as there would be a risk of tearing them.
HOW TO MEASURE
Press the ON/OFF key to switch on the instrument. If the probes are con-
nected, the instrument is ready to indicate their value. The instrument may
be fitted with probes for measuring temperature (°C, °F), probes for photo-
metric measurements (lux, fcd) or radiometric probes (W/m
2
). When the
instrument is switched on the auto-power off device is activated; this
means that the instrument switches off automatically after 8 minutes
unless another key is pressed. If the instrument switches off automatically
while a measurement is being taken it is sufficient to switch it back on.
Measurements are taken by positioning the probe in the desired point; the
choice of the type of probe, the position and place depend on the type of
recording that the user intends to make.
The operator must be sure that his own presence, foreign bodies or outsi-
de sources do not interfere with the recording.
If the probe is not connected to the
instrument when it is switched on, or
if there is a break in the probe, the
"Err" message appears.
This message appears on the
display when the user tries to obtain
the difference between inputs A and
B when two probes of different types
are connected.
This symbol appears on the display
when the reading is out of scale.
Symbols lit besides
the numbers
Key
Description
Err
E1
OFL