B&K Precision 1823A - Manual - Manual (Page 16)

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3-6. Time Interval Measurements(A

B)
In time interval mode, unit measures the elapsed time from a selected edge of
the input A waveform to a selected edge of the input B waveform. For a stable
reading, the two input signals should be related to each other such that this time
interval remains reasonably constant from one measurement to the next. For
example, two digital waveforms derived from the same clock would be suitable;
two arbitrary frequencies from separate function generators would not.
a. Connect the signal to be measured to the input A and input B.
b. Set the T.l(A

B) of function switch. The switch label serves as a
reminder that the measurement starts at the input A edge and stops
at the input B edge.
c. Select desired edge of each waveform using the input A, and input B
slope switches push switch in for negative-going edge, leave out for
positive-going edge.
d. Set a trigger level control to preset (Push In). This ensures that both
input A and input B are triggering at the same level (approximately the
average) on their respective waveforms.
e. Select the degree of resolution desired, using the gate time switch
f. Time interval is given by the display, the gate indicator lights while
each measurement is in progress, and the display is updated at the
end of each measurement interval.
g.
Press the hold switch, “freezes” the display at the existing reading
when hold is released, a new measurement begins (Gate Indicator
Lights), but the display continues to hold the old reading until the new
measurement is completed.