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WAVECREST Corporation
3.0
100 MHz Oscillator Check
(3-1) Connect one SMA cable to the l00 MHz reference clock output at the back of the unit.
Connect the SMA cable to the frequency counter (50 ohm input) and verify the oscillator
output is 100.0 MHz ±0.9 Hz.
If necessary, remove the screw on the top surface of the oscillator located in the front half
of the system, and use the non-conductive adjustment tool to change the oscillator
frequency. (Clockwise adjusts the frequency down.) Allow frequency to settle for one to
two minutes before readjustment.
(3-2) When adjusted properly, install screw into oscillator. Re-install top and bottom covers,
but do not put screws in the top cover at this time. Allow system to run for one hour
before proceeding.
(3-3) Repeat the oscillator check and verify the oscillator output is 100 MHz ±0.9 Hz before
proceeding. When ready to proceed, install the screws in the top cover.
4.0
Self Calibration
Note:
The (4) shorting caps and (2) 36" SMA cables provided with the system will be used
in the following steps.
(4-1) Initiate an internal calibration sequence by pushing the INT CAL button on the front
panel. The display will indicate the time remaining to accomplish the internal calibration,
counting down on the display. When the countdown reaches 0 seconds, the display will
change to: CALIBRATED. The previous mode and display then returns.
(4-2) Press the EXT CAL button on the front panel. The display will direct the user from the
front panel. Both the DC and AC calibrations should be done at this time. Follow the
instruction prompts on the front panel display. DO NOT use shorting caps on the CAL1
or CAL2 output connectors. Use only on CH1, CH2, ARM1 and ARM2 connectors.
When the instrument completes its calibration sequence, the DTS will display
CALIBRATED. The previous mode and display then returns.
(4-3) With the DTS connected to a computer, use the "Virtual Instruments" software or
calibration software to first perform the DTS connect sequence over the GPIB interface,
then perform the STROBE CAL operation. Follow the instructions on the computer
display. When the strobe calibration has completed successfully, exit the program and
disconnect the GPIB interface.
This completes the calibration portion of this procedure. The remaining steps are performance
verification steps to ensure the system is operating properly.
DTS-2077 Calibration Procedure
4
(17 April, 1998)
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