User manual

H49.0.02.6C-07 User’s Guide GMH 3750 page 12 of 16
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9.2 Analogue Output – Scaling with DAC.0 and DAC.1
Note: Analogue output can not be used during logger recordings
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 Input Adjustment
10.1 Zero Displacement ('Offset')
The zero displacement is used to adjust the measuring display for probe deviations.
temperature displayed = temperature measured - offset
Standard setting: 'off' = 0.0°, i.e. no zero displacement will be carried out. Together with the scale correction
(see below) this factor is mainly used to compensate for sensor deviations.
Unless the factor is set to 'off', the offset arrow in the display shows an active zero displacement.*)
10.2 Scale Correction ('Scale')
The scale correction is used to adjust the measuring display for probe deviations. (factor is in %):
displayed temperature[°C] = measured temperature[°C] * (1+Scal/100)
or: displayed temperature[°F] = (measured temperature [°F]-32°F) * (1+Scal/100) + 32°F
Standard setting: 'off' =0.000, i.e. temperature is not corrected.
Unless the factor is set to 'off', the Corr arrow in the display shows an active scale correction.*)
*) The standard curve (Lin E.751) and the user sensor curve (Lin USEr) posses separate correction settings.
10.3 Calibration Services
Calibration certificates – DKD-certificates – other certificates:
If device should be certificated for its accuracy, it is the best solution to return it to the manufacturer.
Only the manufacturer is capable to do efficient recalibration if necessary to get results of highest accuracy!
11 Probe Connection
The device is constructed and optimised for the connection of a Pt100 4-wire probe via 4 pole Mini-Din
connectors.
4-wire connection
Figure shows upon probe jack pins
It is also possible to connect an 3- or 2-wire probe to the device. Please observe that in consequence of the
cable and contact resistance an increased measuring fault will occur.
The connection of this probes should be carried out as follows:
3-wire connection 2-wire connection
Pt100
Pt100
Pt100