EZ Digital FC-3000 Operation Manual - Caution
17
VOLTAGE SELECTOR : Select ac power, 115V AC or 230V AC.
AC INLET
:For connecting of the supplied ac power
INT/EXT TIME BASE SELECTOR : Select the time base, switch position
EXT. STD.IN provides a nominal 600
Ω input impedance
path for an external 10 MHz time base. switch position
INT. STD.OUT monitors the internal time base signal.
GROUND TERMINAL
FUSE HOLDER
:Replacing fuse with unscrewing
INT/EXT TIME BASE BNC: Serves as a monitoring point for the internal time
base signal, or provides an input path for an external
time base signal depending on the INT/EXT switch setting.
The external signal should have a voltage range of
1.5V~5 Vrms.
RS-232C CONNECTOR : Connector for serial interfacing with computer.
3-2. Operating Introductions
Below is the basic operating information needed for frequency counter.
a. Connect the unit to AC power cord into receptacle on rear panel and
plug into AC inlet.
b. To Turn on equipment, push power on-off switch on.
c. set the function indicator position to FREQ A and Gate time indicator to
1 Sec position.
CAUTION
1. APPLICATION OF INPUT VOLTAGES HIGHER THAN THE LIMITS LISTED IN
THE SPECIFICATIONS SECTION MAY DAMAGE THE COUNTER. BEFORE
APPLYING ANY SIGNAL TO THE INPUTS, MAKE CERTAIN THAT IT DOES NOT
EXCEED THESE SPECIFIED MAXIMUMS.
2. FREQUENCY COUNTER GROUND POINTS ARE CONNECTED DIRECTLY TO
EARTH GROUND. ALWAYS CONNECT FREQUENCY COUNTER GROUND ONLY
TO GROUND POINTS IN THE CIRCUIT UNDER TEST.
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