User's Guide

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the field. The BS900 Bridge Simulator and 9V Battery Connector have
been provided for this purpose. See section 4.2 Bench Testing for
details.
4.1 Field Testing
Although the settings of the TX20K can be changed during operation of
the system, it is best to determine the appropriate Transmitter Gain
setting for a given application prior to installation. Refer to Appendix B
for the relevant calculations.
1. Attach sensor or strain gage to the shaft (or other surface) where
the desired strain will be measured. Refer to Appendix C for
instructions on strain gage application.
2. Secure TX20K and fresh battery to shaft using fiberglass
reinforced strapping tape. Do not cover TX20K Status Indicator.
Alternatively, hose clamps, machined collars, or other mounting
devices may be used but avoid excessive compression.
CAUTION: Be certain all components are fixed firmly to moving
surfaces. The fiberglass reinforced strapping tape should be
wrapped around at least 10 times (5 times in each direction) to
secure the components to the shaft. The open end of the tape
should follow shaft rotation. For extra protection, glue the end of
the tape down. When finished with your testing, cut the tape and
remove the components. Avoid the risk of being struck by an
improperly secured object flung from the machine by standing
clear during operation!
NOTE 1: This method of securing the transmitter and battery
holder is for temporary use only. For long term use this tape
should be examined frequently for the effects of environmental
influences (e.g.: excessive oils) or extreme conditions (e.g.: rapid
starts/stops, high temperatures). Replace tape as required
following the notes in the “CAUTION” previously listed.
NOTE 2: If the shaft is small (
≤1” or 25 mm), balance might be
an issue. In this case, mount the TX20K and battery 180° from
each other on the shaft. The battery weighs nearly the same as
the TX20K.
3. Connect the positive battery terminal to +PWR on TX20K and
the negative battery terminal to -PWR on TX20K. The Status
Indicator light should blink several times and then come on solid.