
(4) Select a desired display resolution value (gate
t i m e ) w i t h G A T E s w i t c h © .
(5) 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 measure-
ment interval is over (when the G A T E L E D
becomes i n a c t i v e ) .
Note : The measurement m a y be delayed or
display m a y be unstable. F o r these
unexpected operations, refer to section
5 - 6 ' D i s p l a y Description'.
(6) If H O L D s w i t c h © is pressed during frequency
measurement, the current measurement value
on the D i s p l a y is held a s it i s . If pressed
a g a i n , a new measurement cycle w i l l be s t a r t e d .
However, the measurement value currently being
displayed w i l l remain unchanged u n t i l the new
measurement cycle is complete. T h a t i s , the
display value being held by the H O L D s w i t c h
is updated by the output value f r o m the new
measurement operation.
(7) If R E S E T s w i t c h © is pressed during frequency
measurement, the measurement value on the
D i s p l a y w i l l be reset to ' 0 ' . If released, a
new measurement cycle w i l l be s t a r t e d .
However, the measurement value w i l l remain
' 0 ' until the new cycle is complete.
Input A d j u s t m e n t Functions
1) Input A d j u s t m e n t w i t h an L P F
Press L P F (low pass f i l t e r ) s w i t c h © to
eliminate noise signal components. If the
internal L P F circuit function is enabled, the
input signal to the C H A N N E L A juck is
handled f i r s t by the L P F c i r c u i t (about
10kHz) and then input to the counter.
Therefore, the counter processes input signals
w i t h o u t high-frequency noises only. A s a
result, accurate low-frequency measurement
is assured.
2) A T T x 10 s w i t c h
Press A T T x 1 0 s w i t c h ( - M L ) according to
input signal levels.
If the internal attenuator c i r c u i t is enabled,
input signal to the C H A N N E L A juck is
20
Содержание FC-757
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