Agilent Technologies U1251A manual Frequency Counter, Press

2 Making Measurements

Frequency Counter

• Use the frequency counter for low voltage applications only. Never use

WA R N I N G

the frequency counter for line power system.

•For inputs more than 30 Vpp, you are required to use frequency measurement mode available under the current or voltage measurement instead of frequency counter.

Set up the multimeter to measure frequency as shown in

	Figure 2- 6. Probe the test points and read the display.
	• Press	to select the Frequency counter (Hz) function. “-1-“ on
N O T E
	the secondary display means the input signal frequency is divided by 1.

This allows signals of up to a maximum frequency of 985 kHz to be measured.

•If the reading is unstable or is zero, press to select the division of the input signal frequency by 100. This allows for a higher frequency range of up to 20 MHz to be measured.

•The signal is out of range if the reading is still unstable after the above step.

•While the secondary display shows “-1-“, you may scroll through the

pulse width (ms), duty cycle (%), and frequency (Hz) measurements by

pressing .

32 Agilent U1251A/U1252A User’s and Service Guide