UNISource Corporation FG-8102, Руководство по эксплуатации

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decimal points display the max. 50 MHz of external frequency.
E. PUSHED-IN FREQ.RANGE S.W X1.
F. LOW PASS FILTER : If necessary, engage the LPF (low pass filter)
switch. This route the input through a low pass filter (-3 dB point of
approximately 100 KHz) before application to the frequency counter.
This helps eliminate counting errors in low frequency measurements
by minimizing effects of high frequency noise present on the input.
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
NOTE
THE OVERVOLTAGE CATEGORY OF EXTERNAL FREQUENCY INPUT
TERMINAL IS “CAT II”. IT IS PERFORMED ON CIRCUITS DIRECTLY
CONNECTED TO THE LOW VOLTAGE INSTALLATION.
4. MAINTENANCE
CAUTION
IT IS ESSENTIAL FOR SAFETY TO PROPERLY MAINTAIN AND SERVICE THIS
INSTRUMENT
WARNING
VOLTAGES WITHIN THIS INSTRUMENT ARE SUFFICIENTLY HIGH TO
ENDANGER LIFE. COVERS MUST NOT BE REMOVED EXCEPT BY PERSONS
QUALIFIED AND AUTHORIZED TO DO SO AND THESE PERSONS SHOULD
ALWAYS TAKE EXTREME CARE ONCE THE COVERS HAVE BEEN REMOVED.