Tektronix CMC251, Руководство пользователя

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Reference
CMC251 User Manual
17
3. Control the TOTAL mode by applying a TTL logic signal to the
external input connector as folows:
H
Apply a low level (0 volts) to stop the count (same as the HOLD
button)
H
Apply a TTL logic high level (+5 V) to resume the count (same
as releasing the HOLD button)
Checking Instrument Operation
At any time, you can verify the accuracy of the CMC251 Frequency
Counter by using the CHECK function. Press the FUNC button until
CHECK is indicated by the lighted LED. The readout will display
10.000 MHz.