14
Updating Firmware
The firmware of the TDR 150 can be updated us-
ing a USB flash drive. Firmware update files can
be found at the Spectrum website.
Note: Updating the firmware is different than up-
grading it to activate the GPS and Bluetooth capa-
bility (p. 15)
1.
Copy the latest firmware update from your PC
onto your flash drive.
2.
Power off the meter.
3.
Insert the flash drive into the meter's USB port.
4.
While holding down the
Delete
button, and
press the
On/Off/Back
button. The meter will
beep.
5.
Release the Delete button after the meter beeps
a second time.
6.
Remove the flash drive.
The meter will then power up as usual.
The meter will then show that the calibration is
complete for that specific rod length. If more than
one rod size is being used, a calibration operation
must be done for each one.
Note: This procedure is different than a soil
-
specific calibration (Appendix 1, p. 31) where a
unique calibration curve is generated.
