Chapter 6
Adjustment and verification
Trimble S, VX, SPS & RTS Service Manual6 - 80 P/N 57150002, Revision 5.0
F
TCXO Frequency Calibration
Availability of a Frequency counter with the following specification is necessary.
Range: 100Hz-300MHz
Uncertainty: <1x 10 -7 at (23 ± 3) °C / per year
Resolution: 10 digits, max. 0,1mHz
e.g. Fluke PM6685/-5- with OCXO
This TCXO calibration correction value is used for exact calculation of distances. It is not a correction
of the frequency. The transmitted frequency will not be changed.
Performance
Fig. 6-89 Standard deviation distances test (example for measure prism)
Item Performance Action Results Notes
1 Start up instrument /
PASS.
2 Working condition. A. Mount the TCXO
sensor with adapter
ring marked up.
B. Connect the detector to
a frequency counter
and mount on the
instrument.
The receiving
diode has to be
placed as shown
to cover the
transmitter
beam.
Item Performance Description Result Notes
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