HD2108/HD2128
- 8 -
V2.3
KEYBOARD
AND
MENU
DESCRIPTION
Foreword
In some versions, the instrument keyboard is composed of single-function keys and double-function
keys such as the ON-OFF/Auto-OFF.
In the double-keys, the function in the upper part is the “main function”, while the one in the bottom
part is the “secondary function”. When the instrument is in standard measurement mode, the main
function is active. In the menu or in conjunction with the FUNC key, the secondary function is
enabled.
The pressing of a key is accompanied by a short confirmation beep: a longer beep sounds if the
wrong key is pressed.
The HD2128.1 and HD2128.2 models measure two temperatures: The upper connector is input "A",
and the corresponding temperature is displayed in the main line. The lower connector is input "B",
and the corresponding temperature is displayed in the secondary line.
Each key specific function is described in detail below.
ON-OFF/Auto-OFF key
The instrument is turned on and off using the ON/OFF key. The turning on enables all display
segments for a few seconds, and then the type of calibration enabled (CAL FACT = factory
calibration; CAL USER = user calibration). The instrument is then ready for normal measurement.
MIN
cm
min
s
2
3
m
µ
m
k
>>>
>>>
If no probe is connected to one of the input connectors, the BURN message appears in the
corresponding line.
+
Automatic turning 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. The
AutoPowerOff
function can be
disabled by holding the HOLD key pressed down during the turning on phase: the battery symbol
will blink to remind the user that the instrument can only be turned off by pressing the <ON/OFF>
key.
The automatic turning off function is disabled when external power is used. On the other
hand, it cannot be disabled when the batteries are discharged.
