Using the Digital Multimeter 4
Keysight U1610/20A User’s Guide 99
4 See "Relative Measurement" and "Restart Measurements" for the respective 
functions.
Frequency Measurement 
Frequency of a signal is measured by counting the number of times the signal 
crosses a threshold level within a specified period of time. 
To measure frequency:
1 Press   and use the   keys to select the frequency 
measurement function. Set up the following connections:
2 Read the frequency reading from the display.
3 See "Relative Measurement", "Range", and "Restart Measurements" for the 
respective functions.
Do not connect the thermocouple to electrically live circuits to avoid fire or 
electric shock.