Honeywell TMS 9250 User Manual page 27

The following diagram shows the change in data flow when using FASTMODE.
Because of the significant change in output characteristics that takes place when FASTMODE
is selected, it is implemented as a VOLATILE setting, therefore recycling the power or
performing a soft reset will return the TMS 9250 to NORMAL mode.
As an indication to the user that FASTMODE is in operation, the ROTOR ACTIVE light on the
lid of the TMS 9250 SPM is de-activated.
The strain gage input value is digitized at a rate of 17,656 samples per second with 24-bit
resolution, but this amount of data is in excess of the capacity of the telemetry link, so it is
reduced by the simple averaging of every pair of A-D results at the rotor electronics module.
The data that is transmitted across the telemetry gap consists of 8,828 results per second at a
resolution of 16-bit, and it is this data that is then piped directly to the analog voltage output
whenever FASTMODE is turned on.
The analog voltage output channel is a 16-bit digital-to-analog converter with a bandwidth of
greater than 3 kHz, therefore the expected analog output voltage for a full scale torque
measurement can be calculated by reference to the calibration data tables held in the TMS
9250.
Rev B
April 2012
© 2012 – Honeywell International Inc. All rights reserved
TMS 9250 Product User Manual
2. Modes of Operation
008-0738-00
27