Instructions

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2. DESCRIPTION OF THE FUNCTIONS
The Photo-Radiometer Model HD2302.0 keyboard is composed of single-function keys, except the
ON-OFF/Auto-OFF key that has two functions (see the description of the key below).
The pressing of a key is accompanied by a short confirmation "beep": a longer "beep" sounds if the
wrong key is pressed.
Each key specific function is described in detail below.
This key has two functions:
ON/OFF: to turn the instrument on press ON, to turn it off press OFF.
The turning on enables all display segments for a few seconds, starts an Auto-test including the de-
tection of the probe connected to the input, and sets the instrument ready for normal measurement.
The following is displayed:
MIN
cm
min
s
2
3
m
µ
m
k
>>>
AUTO/OFF: the AutoPowerOff function can be disabled by simultaneously pressing this key
and the "HOLD" key when turning the instrument on.
During turning on, should no probes be connected, the "PROB" message is displayed in the line
for symbols for a few seconds, while the "ERR" message is shown in the central part of the dis-
play.
When the probe is inserted into a functioning instrument, it is not detected: as the data are
captured upon turning the instrument on, it is necessary to turn it off and on again.
Caution! Replace the probes when the instrument is off.
The instrument has an AutoPowerOff function that automatically turns the instrument off after about
8 minutes if no key is pressed during the intervening time.
Press simultaneously the ON/OFF key and the HOLD key to disable this function.
In this case, remember to turn the instrument off using the ON/OFF key: disabling of the automatic
turning off is shown by the blinking battery symbol.
It resets the maximum, average, and minimum value of the captured measurements.
ON-OFF and AUTO-OFF key
Disabling of the automatic turning off
CLR/ESC key