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5. OPERATING PROCEDURES
E v e r y time when you s t a r t using the F C - 7 5 8 M u l t i -
Functional Counter, look a t the rear panel and v e r i f y
t h a t the power supply voltage selector setting
indicates the level of the supply voltage to be a c t u a l l y
applied.
1)
Connect the accessory power cord w i t h the power
input connector (inlet) of the rear panel and
insert the A C plug into the nearby outlet.
2)
Press the P O W E R switch ( J H L ) . The counter w i l l be
turned on.
3)
Read carefully Chapter 3 ' Notes on use' (on page 7 )
to handle this instrument correctly.
5-1
Frequency Measurement
5 - 1 - 1 .
Frequency Measurement w i t h Channel A
( 5 H z to 1 0 0 M H z )
(1)
Input a target signal ( t o be measured) to C H A N N E L
A input juck
® .
(2)
Select either the k H z / 1 0 MHz mode or MHz/100 M H z
mode by using F U N C switch
or MHz L E D ®
w i l l be turned on.
Note : The m a x i m u m allowable measurement
@) . k H z / ^ s
L E D (3)
frequency varies depending on the measurement
modes. In the kHz measurement mode, up to
1 0 M H z - f r e q u e n c y can be processed while the
m a x i m u m frequency t h a t can be handled in the
MHz mode is 1.3GHz.
(3)
Select a desired display resolution value w i t h
G A T E s w i t c h
© .
(4)
The frequency of the input signal currently being
measured w i l l be output to Display
G A T E L E D ©
blinks during the measurement.
The measurement value on the display w i l l be
updated a t the moment when one measurement
interval is over (when the G A T E L E D becomes
i n a c t i v e ) .
(5)
Press A T T x 10 switch ( J B L . ) according to input
signal levels. If the internal attenuator circuit is
enabled, input signal to the C H A N N E L A pin is
attenuated into 1/10 before reaching the counter.
T h i s attenuates noise-superimposed input signals.
In addition, the attenuation circuit preprocesses a
signal w i t h rather a high amplitude into a
reasonable level.
A s a result, accurate counting
is assured.
© .
17
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