H72.0.11.6C-04
Operating Manual GMH 3451
page 14 of 18
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9.2 Analogue Output
An analogue voltage 0-1V can be tapped at the universal output socket (mode: “Out dAC”).
With the DAC.0 and DAC.1 values the output can be rapidly scaled to your efforts.
Keep in mind not to connect low-resistive loads to the output, otherwise the output value will be wrong and
battery life is decreased. Loads above ca 10kOhm are uncritical.
If the display exceeds the value set by DAC.1, then the device will apply 1V to the output
If the display falls below the value set by DAC.0, then the device will apply 0V to the output
In case of an error (Err.1, Err.2, no sensor, etc.) the device will apply slightly above 1V to the output.
plug wiring:
GND
+Uout
Attention!
the 3
rd
contact has to be left floating!
Only stereo plugs are allowed!
10 Adjustment of temperature input
The temperature input can be adjusted with offset and scale. A reasonable adjustment presumes reliable
references (e.g. ice water, controlled precision water bath, etc.).
If the inputs are adjusted (i.e. offset and scale are different from default settings) the device will shortly
display “Corr” after turned on.
Default setting for offset and scale are ‘off’ = 0.0, i.e. inputs are not changed.
Zero point correction:
Displayed value = measured value – OFFS
Zero point and slope correction:
Displayed value = (measured value – OFFS) * (1 + SCAL / 100)
Displayed value °F = (meas. value °F - 32°F - OFFS)
•
(1 + SCAL / 100)
11 Automatic adjustment/calibration of cell correction
Besides the direct input of the cell correction (see below) via the menu (“CELL Corr”) the cell correction can
also be determined automatically:
Manual adjustment
or
Adjustment with reference solution
Menu selection:
“CAL Edit”
“CAL rEF.S”
Menu
selection
of
desired
solution
1413 µS/cm
0.01 M KCL
2.76 mS/cm
0.02 M KCL
12.88 mS/cm 0.1 M KCL
50 mS/cm
KCL
111.8 mS/cm 1 M KCL
Values for 25°C, the temperature
dependency of those solutions are known
by the device and are compensated
automatically.
Press Cal-key for 2 s,
start of calibration
“actual value” e.g. “1723 µS/cm”
“value of solution” e.g. “1413 µS/cm”
and CAL with rotary symbol and CAL with rotary symbol
Calibration
Select desired display value
wait until device measures stable value
with buttons “up” and “down”
and
confirm
with
“enter”
Afterwards the device returns to the normal measuring operation mode or – if so – displays an error
message.
The resulting cell correction can be seen in the menu at “CELL Corr” and the calibration history.
