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unknown signal is released to the counting decades for a precise time interval, determined
by the gate time setting. At the end of the gating period, the count is stopped and the
total is transferred via the readout stages to the display.
4. 7
Operation of the Reset push-button resets the display to zero and clears the
instrument to commence a new measurement. All timing processes are referenced
to the very stable 1OOkHz signal derived from the Frequency Standard oscillator.
SELF-CHECK
4.8
In the CHECK mode the instrument operates as for frequency or period measurement
except that the 1OOkHz signal derived from the Frequency Standard takes the place
of the input signal. This self-check arrangement does not apply to Channel
•s•
of the 9059.
PERIOD MEASUREMENT
4. 9
The input is amplified and shaped, as in frequency measurement, to provide a train
of pulses having a p.r.f. equal to that of the input signal. These pulses are routed
by the electronic changeover switch to the Time Base Divider where they are used to control
the gating time. The signal
b
the gating control circuitry is provided by the 1OOkHz output
of the frequency standard and 1
~s
clock pulses are accumulated in the six counting decades
for the duration of 1, 10, 100, or 1000 periods of the input signal. These clock pulses are
displayed as the period measurement.
4-2
9057/9059
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