A P P L I C A T I O N S
APPLICATIONS OF DIGITAL MEMORY SCOPE
This instrument has a digital memory function to analyze
various w a v e f o r m s w h i c h is not possible with conventional
oscilloscopes. T h e following s h o w s typical examples of the
use of the digital memory scope.
Application to Electric Circuit Measurement of relay
chattering
The operating method is the same as noted in the previous
section.
L o a d
D e v i c e under
test
S e t
LEVEL
knob
to
NORMAL
F i g .
3
. M e m o r i z i n g t h e t r a n s i e n t p h e n o m e n o n o f
m e c h a n i c a l i m p a c t w a v e f o r m s
Contact
I N P U T ,
Relay
F i g . 4 . M e a s u r e m e n t o f r e l a y c h a t t e r i n g
Setting of the Digital Memory Scope
1 . Connect the detector to the device under test, then con-
nect the output of the detector to the input of the scope
through the amplifier
so
that the output level can be set
to the input level of the scope.
2 . Operation of the scope
(1) Input Selector: Set to A C or D C position (set to
either position according to the input signal being
applied).
(2) D I S P L A Y M O D E : Set to R E A L or D U A L position.
Observe the signal from the device under test using the
oscilloscope ( R E A L MODE) and set the input level, trig-
ger point and s w e e p speed a s s h o w n below.
LEVEL knob:
N O R M A L — T h e input signal is swept once
and stops.
Vertical attenuator (VOLTS/DIV):
A n y position.
S W E E P TIME/DIV:
A n y position between 0 . 1 s and
0 . 1 m s .
C L O C K :
INT
S C O P E PEN:
S C O P E
TRIGGER POINT ( - D E L A Y / D I V ) :
T h i s digital s w i t c h
is
used
to record a signal prior to triggering and should be
set to 0 — 9 div.
3 . After setting the above s w i t c h e s , turn the S T A R T
s w i t c h to ON. T h e W R I T E LED (red) will light to indicate
that the input signal is in standby mode. The signal is
now ready to be memorized.
4 . Next, apply the signal from the device under test to the
detector. T e s t the data. W h e n the output level of the
detector reaches the value set by the T R I G L E V E L , the
signal from that point is stored in the memory.
5. T o check the w a v e f o r m being stored, set the D I S P L A Y
MODE s w i t c h to D U A L or M E M O R Y position.
Data recording with pen recorder
Connect to R E A D out terminal
' at the rear panel
Recorder
S T A R T / S T O P
control terminal
" F O R P E N
range
Pen R e c o r d e r
(X-Y
Recorder)
M e m o r y
O U T terminal
To record memory data with pen recorder ( X - Y recorder),
make connection as s h o w n in Fig. 7 and operate the scope
as follows:
1 . Change the position of the C L O C K mode s w i t c h from
S C O P E to PEN (Set the C L O C K to INT and the D I S P L A Y
MODE to D U A L or M E M O R Y ) . It may be set to R E A L
while the F R E E RUN function is on.
2. Set the PEN S P E E D knob to either the 1 0 , 2 0 or 5 0 ms
position.
3 . Depress the S T A R T (memory data is outputted word by
word).
Note
If the pen recorder has an external S T A R T / S T O P control
terminal, the timing pulse output is obtained from the
READ OUT FOR PEN terminal (BNC) at the rear panel. The
S T A R T signal is outputted in GND level.
To obtain the amplitude cycle of input signal from the
waveform recorded by the pen recorder, refer to the section
"Operation".
1 2
Detector
A M P ]
, I N P U T |
S e t L E V E L knob
to
N O R M A L
* S e t D E L A Y to 2 ~ 5 divisions.
Y input terminal
F i g . 5 . D a t a r e c o r d i n g w i t h p e n r e c o r d e r
