B&K Precision 1823A - Manual - Manual (Page 17)

17
3-7. 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 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.
c. Select the resolution desired using the gate time switches.
d. Frequency ratio 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.
e. Press the hold switch "freezes" the display at the existing reading.
When hold is released, a new measurement begins, but the display
continues to hold the old reading until the new measurement is
completed.