Kenwood FC-757 Instruction Manual page 37

The proper trigger
indicated by the broken Sine a t the top.
T h a t i s , it is set almost above the noise signal
level.
Figure 6. E x a m p l e trigger
6-6 Self check mode
The self check mode is provided to check the
internal general functions of the FC-757 universal
frequency counter f o r a short
(Operational procedure)
(1) Select the C H E C K / 1 0 M H z mode w i t h
switch © .
When the universal counters enters this
lever shown in the figure is
Adjustable
this level.
P R E S E T - I N
(average center)
level adjustment
t i m e .
F U N G
mode,
the counter input is logically connected to the
time base oscillator.
(2) Change the resolution
G A T E s w i t c h w i t h display unit select switch @
pressed a f t e r the counter has entered the self-
/ check mode, and then v e r i f y that
results agree to those listed below.
into
Resolution
level
value setting
0.01s/1
0.1s/10
1.0s/100
10s/1000
* 2 G A T E
interval period.
is 200 milliseconds.
(3) Change the resolution values by using the
G A T E s w i t c h w i t h display unit select switch ©
values by using the
the output
G A T E
Output display
(measurement
interval
10000.0 kHz
0.01 second
• 10000.00 kHz •
0.1
10000.000 kHz
1
0000.0000 kHz
10
( O V E R F L O W
L E D lights up)
L E D (D remains active during the
The measurement
time
o
* 2
period)
second
second
seconds
interval
37