EZ Digital FC-3000 Operation Manual - Note
20
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.
3-8.
Frequency Ratio Measurements (A/B)
In this mode of operation, the counter displays the ratio of the frequency applied to
input A to the frequency applied to input B. The input A frequency should preferably be
equal to or greater than that of input B. And both frequencies must be within the limits
given in the "SPECIFICATIONS" section. Frequency ratio is determined by counting
the number of input A cycles occurring during a specified number of input B cycles
(1.10.100.1000) and applying the result, with a proper decimal point, to the display.
a. Connect a signals to be measured to the input A and input B
NOTE
BOTH INPUTS MAY BE CONNECTED TO THE SAME SIGNAL FOR A RATIO OF
1.000000 AT THE GATE TIME 1 SEC. THE UNIT INDICATORS ARE OFF BECAUSE
THE READING DISPLAYED IS RATIO.
b. Set the ratio A/B of function switch.
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