Reference
12
CMC251 User Manual
To make a period measurement, perform the following steps:
1. Estimate the signal source frequency and determine the voltage
level. A good practice is to display the signal on an oscilloscope
and obtain the peak voltage level.
2. Refer to Table 6 and set the frequency counter front-panel buttons
to obtain the best period measurements.
Table 6: Period Measurements
>40 ns (<25 MHz)
>400 ns (<2.5 MHz)
50 mV to 5 V
3 V to 42 V
50 mV to 5 V
3 V to 42 V
INPUT
VOLTAGE
LO
(button out)
HI
(button in)
LO
(button out)
HI
(button in)
PRE-
SCALE
Button In
Button In
Button Out
Button Out
3. Press the FUNC button until PERIOD A is indicated with a
lighted LED.
4. Connect the signal to the CHANNEL A INPUT connector.
5. Press the GATE button to select the desired display resolution.
Refer to Table 7 for the available resolutions.
Table 7: Resolution For Period Measurements
GATE Setting
Number of Events averaged
PRESCALE In
PRESCALE Out
X1
10 cycles
1 cycle
X10
100 cycles
10 cycles
X100
1000 cycles
100 cycles
X1000
10000 cycles
1000 cycles
Summary of Contents for CMC251
Page 1: ...User Manual CMC251 1 3 GHz Frequency Counter 070 8527 03...
Page 4: ......
Page 10: ...General Safety Summary vi CMC251 User Manual...
Page 18: ...Getting Started 8 CMC251 User Manual...
Page 28: ...Reference 18 CMC251 User Manual...
Page 34: ...Appendix A Specifications 24 CMC251 User Manual...