Making Measurements 2
Keysight U1251B and U1252B User’s and Service Guide 59
Frequency Counter
Set up the multimeter to measure frequency as shown in Figure 2-6. Probe the
test points and read the display.
WARNING
– Use the frequency counter for low voltage applications only. Never use
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.
NOTE
– Press to select the Frequency counter (Hz) function. “-1-“ on 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 .
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