5. Description of the Instrument
Projekt Elektronik
MESS - UND REGELUNGSTECHNIK GMBH
page 9
5.2
Functional Principle
Fig. 2: structural construction of Teslameter FM 3002
The graphic shows the simplified structural construction of the Teslameter FM 3002. To achieve the
outstanding accuracy of the device a multitude of parameters is incorporated. In the graphic thereof
are only shown the measurement of the probe temperature and the actual value of the probe signal.
The generated corrections directly affect to the analog signal path. This principle offers considerable
advances against solely digital correction techniques. At solely digital correction techniques first the
probe signal is digitized with an analog-to-digital converter, corrected at the digital level and then again
putted out as an analog signal via a digital-to-analog converter. Due to the restricted resolution of the
converter it is inevitable that steps occur in the output signal. In contrast the Teslameter FM 3002 with
its principle generates a continuous signal response.
The analog output of the Teslameter FM 3002 is directly feed from the corrected signal and therefor
provides full correction and yet a bandwidth of 100 Hz.
Eventually the corrected high precision analog output is sampled with a high-resolution analog-to-digital
converter. Out of it the values for the digital display and the serial port are obtained. The settings for
integration time and filter affect only the digital path. The program for relative measurement is also
generated in the digital path. The analog output is not affected by these settings.
5.3
Items Supplied:
1
Teslameter FM 3002
1 factory calibration certificate
1
probe in a probe case
1 operating manual
1
power cord
1 CD with software examples
1
RS 232 cable 10 m
1 zero chamber (option)
1 probe extension cord (option)
probe
correction
generation
J
analog output
1.234567 T
ADC
digital
filter
100 Hz
digital display