13 | 18
5.2 Adjustment / calibration of the amplifier
In order to adjust or calibrate the amplifier at least one multimeter has to be connected to one of the
analogue outputs.
Inspection:
■
Unload the measuring device.
■
Connect the multimeter (refer to chapter 4 “Terminal Assignment”).
■
Set the analogue output to 0 Volts resp. 4 mA.
■
Load the measuring device (i.e. the transducer) at least 3 times fully.
■
Load the device with 80 % of its maximum load.
■
Check if the analogue outputs comply with the load and is in the designated specs.
■
If not, the measurement system might need to be recalibrated. Above that, the installation
position and the overall setup might need an inspection.
Adjustment / Calibration:
The coarse amplification, and thus the voltage output, is determined by an internal resistor (RG) and
can be fine adjusted by a potentiometer (P-102 and P-202). To adjust the current output, which follows
the voltage output, the potentiometer P-10/11 and P-20/21 are to be used. (See next chapter.)
Before the calibration a warm-up time of approx. 30 mins should be kept. The measuring device is to
be unloaded.
Unloaded means with:
Force transducers:
no applied force at all
Pressure transducers
no pressure, except atmospheric influence
■
In this unloaded state adjust the zero-point with the potentiometer P-01.
■
Apply a defined load. (by calibrated weights, pressure generator etc.)
■
Adjust the analogue output corresponding to the applied load.
In order to reach the required accuracy, it may be necessary to repeat these steps.
