Keysight U1251B Schnellstart Handbuch Seite 16

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4 Probe the test points and read the display.
5 If the reading is unstable or zero, press
to select division of input signal frequency by
100. This accommodates a higher frequency
range of up to 20 MHz.
6 The signal is out of range if the reading is still
unstable after
– Use the frequency counter for low voltage
WARNING
applications. Never use the frequency counter on
AC power line systems.
– For input more than 30 Vpp, you are required to
use frequency measurement mode available under
the current or voltage measurement instead of
frequency counter.
16
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step 5.
Keysight U1251B and U1252B Quick Start Guide