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Time Verification
The timer verification menu is used to check the accuracy of the internal
time base. No adjustment is possible as this is a check to ensure Sprint LC
agrees with a calibrated time standard. Use the INCREMENT and
DECREMENT keypads to set the target value. Maximum target value is 30
seconds. The reading counts down in tenths of a second from the target
setting. Observe the measuring standard (such as a frequency counter), and
compare the standard to the target output. Timer repeatability is better than
plus or minus 0.01 second in 30 seconds. The time base is derived from a
crystal oscillator controlled by the main microprocessor.
Time Verification Menu
FIGURE 84
The BNC connector on the rear of the Sprint supplies
a TTL signal, approximately 5VDC on and 0 VDC off.
Center is signal and collar is ground.
If the target time is set for 8 seconds, for example, Sprint LC alternates the
timer verification voltage between 8 seconds on and 8 seconds off.
FIGURE 85
Back Inc Dec
Time Verification
Reading
Timer .9 sec.
Target 1.0 sec.
TIMER
Hi
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