Kenwood FC-757, Инструкция по эксплуатации, Страница: 34 / 40

6. MEASURING C O N S I D E R A T I O N S
(4) Interval between measurements
The i n t e r v a l between measurements ( G A T E
L E D O F F period) is f i x e d to 200
milliseconds in a l l the measurement modes.
However, if signal frequencies are measured
in the M H z / m s mode, t h a t period is f i x e d
to 400 milliseconds.
If event inputs are counted f o r t o t a l i z a t i o n ,
the count operation m a y continue even
during t h i s i n t e r v a l .
Note t h a t these fixed i n t e r v a l s have nothing
to do w i t h the gate t i m e s , number of
cycles and input frequencies.
6-1 Use of attenuator probe
The input impedance (1.2Megaohm, and 40pF or
less) of the C H A N N E L A input juck is not a f -
fected through manipulation of A T T x 10 s w i t c h
© .
The circuit load can be reduced by connecting
the attenuator probe to the C H A N N E L A input
juck. Set the attenuator probe to the x 10 po-
s i t i o n to reduce the circuit load. T h i s applies
to C H A N N E L B.
N O T E : If 10 : 1 attenuator probe is used, ver-
i f y t h a t the amplitude of the signal in-
put to the counter s a t i s f i e s the f o l l o w -
ing condition.
M i n i m a m Attenuated input
<
signal level signal level
6 - 2 Change in measurement mode and resolution
A new measurement operation is s t a r t e d each
t i m e when a measurement mode or resolution
value is changed. The measurement display d a t a
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