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A s the above table shows, the gate
w i l l
be short if a low resolution value is
selected.
T h i s w i l l be helpful
adjusting an oscillator, which requires quick
update.
The measurement interval w i l l
longer if a highed resolution value is
selected.
(2)
Period measurement mode and time
mode
The period measurement mode processes the
specified number of cycles and then
the average cycle time.
of cycles can be specified by using the
G A T E s w i t c h .
The relationship between the
number of cycles and the G A T E switch i s
shown in the table
below.
Measurement
Resolution
value setting
mode
kHz /
0.1/«s
s
fit
kHz / i«s
0.01
0.001 j«s
/ ps
kHz
kHz / / i s
0.0001 fis
MHz / ms
0.0001ms
MHz / ms
0.00001ms
MHz / ms
0.000001ms
time
in fine-
be
interval
outputs
The desired number
No. of cycles
measured (No. of
time intervals)
1
10
100
1000
1
10
100
(3)
Frequency r a t i o
mode
The frequency r a t i o mode requires
signals to be input to the counter
jucks. C H A N N E L A and C H A N N E L B input
jucks. The counter s t a r t s measuring each of
the input signals and stops it when the
number of counts on the C H A N N E L B
reaches a specified value.
counter outputs
the counter value on the
C H A N N E L A to the D i s p l a y .
counter value is modified
decimal point and then displayed as the
output frequency
r a t i o .
In this measurement mode, the G A T E
is used to specify a specific standard value
(No. of signal a r r i v a l s ) for the
B. The standard count values on the channel
are as f o l l o w s .
G A T E switch setting
1
10
100
1000
two
input
In this case, the
T h i s output
w i t h a given
switch
C H A N N E L
No. of arrival signals
on C H A N N E L B
1
10
100
1000
33
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