HP 53131A, Operating Manual

Page: 104 / 196

Chapter 2 Operating Your Universal Counter
Using the MATH Menu Keys
2-28 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 sinusoidal output, and make the Counter directly display the
measurement in rpm (which is fundamentally a frequency measurement).
The equation for this task is:
Perform the following procedure to accomplish this task.
1 Connect the sinusoidal output to channel 1 input, and set up the Counter
to measure frequency of the signal. (Refer to the section in this chapter
titled “To Measure Frequency” if needed.)
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.
Frequency
Resolution
Sec
--------------------------------
 
 
Scale
×
60Sec
Min
--------------
 
 
Results
Resolution
Min
--------------------------------
 
 
=