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2
Making Measurements
Frequency Counter
WA R N I N G
N O T E
38
Use the frequency counter only for low voltage applications. Never
use the frequency counter on an AC power line system.
1 Set the rotary switch to
2 Press
to select the Frequency Counter (
function. The default input signal frequency is divided
by 1. This allows signals up to a maximum frequency of
985 kHz to be measured.
3 Connect the red and black test leads to input terminals
V (red) and COM (black) respectively (refer to
page 39).
4 Probe the test points and read the display.
5 If the reading is unstable or zero, press
division of input signal frequency by 100 (
shown on the display). This accommodates a higher
frequency range of up to 20 MHz.
6 The signal is out of the U1253A frequency measurement
range of 20 MHz if the reading is still unstable after
Step
5.
Press
to scroll through the pulse width (ms), duty cycle (%), and
frequency (Hz) measurements.
.
Figure 2- 6
to select
will be
U1253A User's and Service Guide
)
on
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