Section 17 - Calibrate Channels
35
1. Disconnect COM and IN wiring from the channel A terminals on the Signal Input Relay
Module.
2. Connect function generator and multimeter to
COM
and
IN
with polarity as shown in the
Calibration Setup diagram on the previous page.
•
In the event the function generator cannot supply the necessary DC offset, a floating DC
Power Supply will need to be connected in series with the function generator. Connect
the positive terminals of the function generator and power supply, connect the negative
terminal of the power supply to
IN
signal and the negative terminal of the function
generator to the
COM
signal.
17.2 Calibration Procedure
1. Open front panel.
2. Adjust function generator to output a 100 Hz sine wave with -9 Vdc bias. Adjust the
amplitude for meter full scale (1 V pp = 0.354 Vrms).
Transducer Type
Transducer Scale Factor
7200 5 & 8mm, 3000, 3300 8mm, RAM,
and 3300XL 8mm
(200 mV/mil)
NOTE:
External barriers only available for 3300
8mm transducers.
1 mil pp = 200 mV pp *
10 micrometres pp = 78.7 mV pp
*NOTE:
If external barriers are
used, the scale factor through the
barrier circuit is 200 mV/mil with a
scale factor of 192 mV/mil going
directly into the monitor.
7200 11 & 14mm, 3300 16mm HTPS & 3300 XL
11mm
(100 mV/mil)
1 mil pp = 100 mV pp
10 micrometres pp = 39.4 mV pp
•
Example
:
For a 3300XL 8mm transducer and a display of 5 mil pp full scale, the full-scale input
voltage is:
5 mils X 200 mV pp/1 mil = 1 V pp or:
5 mils X 200 mV pp/1 mil X 0.354 Vrms/1 V pp = 0.354 Vrms
