Getting Started
2
CMC251 User Manual
Preparing the Frequency Counter for Use
Check the following items prior to operating the frequency counter
for the first time (see Figure 1 for locations of items 1 through 3):
1
2
3
Figure 1: Line Voltage Selectors, Power Input, and Fuse Locations
CAUTION.
To prevent damage to the instrument, set the line voltage
selectors to the proper voltage setting and install the correct line
voltage fuse before operating the equipment.
1. Set the line voltage selectors to the input line voltage. These
selectors connect internal wiring for various line voltages. This
product is intended to operate from a power source that does not
supply more than 250 V
RMS
between the supply conductors or
between either supply conductor and ground. For line voltage
ranges, refer to Appendix A: Specifications on page 19.
WARNING.
To prevent electrical shock, unplug the power cord and
disconnect the signal input cable from any signal source before
checking or replacing the fuse.
2. Check that the correct line fuse is installed. The line fuse
provides protection if the equipment malfunctions or an overload
occurs. Refer to Appendix C: Replaceable Parts on page 27 for
fuse part numbers.
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...