Chapter 2 Operating Your Frequency Counter
Using the MATH Menu Keys
2-22 Operating Guide
2
To Use the Scale/Offset Math Menu
Example Procedure for Scale Function
For demonstration purposes, you have a motor that has a tachometer attached to its
rotating shaft that generates a pulse for every revolution of the shaft.
Your task is to measure the speed or revolutions per minute (rpm) of the tachometer’s
output, and make the Counter directly display the measurement in rpm (which is
fundamentally a frequency measurement). The equation for this task is:
Frequency (Revolution/Sec) × Scale (60 Sec/Min) =
Results (Revolution/Min)
Perform the following procedure to accomplish this task.
1 Connect the output to channel 1 input, and press Freq Ch 1 key.
The frequency of the signal is displayed.
2 Press Scale & Offset key until SCAL: 1.000000 is displayed.
3 Set the Scale to 60 (since there are sixty seconds in a minute) by performing the
following steps:
a. Press appropriate arrow keys to set Scale to 60.
b. Press Enter key.
NOTE BE SURE to press the Enter key to complete the numeric entry.
The scale is now set to 60.
When the scale factor is set, both scale and offset are applied to the measurement
result. Verify that the offset value is zero for applications requiring only scale by
performing the following step.
4 Press Scale & Offset key, if required, until OFFS: is displayed.
OFFS: 0.000000 should be displayed. If the Offset value is not set to “0.000000”:
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