Keysight U1281A Guide De L'utilisateur page 74

2 Making Measurements
Frequency Counter (for U1282A only)
– Use the frequency counter for low voltage applications. Never use the frequency
WARNING
counter on AC power line systems.
– For input more than ± 1.8 Vp, you are required to use the frequency measurement
mode available under the current or voltage measurement instead of the frequency
counter.
The frequency counter can be set to divide a signal for megahertz (MHz) measurement. You
can use this to measure the stability of the crystal oscillator clock over time.
1 Position the rotary switch to
2 Press
3 Probe the test points and read the display.
4 If the reading is unstable, press
74
to select the frequency counter mode.
Shift
Esc
MHz
.
to toggle between a Hz or a MHz reading.
Range
Keysight U1281A/U1282A User's Guide