Trio MS-1650B Instruction Manual

MS-1650B
DIGITAL MEMORY OSCILLOSCOPE
INSTRUCTION MANUAL
TRIO
FEATURES
This instrument is a combination of an oscilloscope having a frequency band of D C - 1 0 MHz and a digital memory having
memory ability of 8 b i t s x 1 0 2 4 words and write speed up to 1 /is/word. Input signal can be stored in the memory so that
memory signal is displayed on the C R T at any time.
The instrument is readily connected to a pen recorder. It memorizes and displays signals prior to triggering, instantaneous
signals, transient waveforms and repetitive waveforms. This model is designed as a multitrace memory oscilloscope which
combined with the memory unit M U - 1 6 5 K - T ) (option).
1 . Instantaneous
signals,
transient
waveforms,
and,.™...
repetitive waveforms can be stored in the memory for
displaying on the C R T .
2 . By connecting the M U - 1 6 5 K - T ) memory unit to M S 1 6 5 0 B , the later can be used for a maximum of 4
traces digital memory oscilloscope.
3 . Semiconductor memory circuit having memory ability of
8 bits x 1 0 2 4 words and write speed up to 1 /^s/word.
4 . The oscilloscope covers a wide D C - 1 0 MHz band. The
controls and switches of the oscilloscope are also used
to store input signals in the memory
9. Real time waveform being displayed on the screen can
be stored in the memory, thus providing simplified
operation.
1 0 . Both the real time waveform and memory signal can be
displayed simultaneously, permitting you to compare
one signal with the other.
1 1 . Memorized date contents can be kept on hold for over
a week after power has been cut off because a
memory back-up capacitor has been built-in. Thus you
can store data for as is while earring M S - 1 6 5 0 B .
and display
1 2 . Signals synchronized with power frequency can be
displayed or stored in the memory.
5. — D E L A Y function is provided to store signals prior to
1 3 . The oscilloscope can be used as a X - Y scope by simply
setting the D I S P L A Y MODE switch to the X - Y position.
memory signals.
triggering in the memory which is not possible with
conventional oscilloscopes.
6. The automatic free-run function repeats write-in and
read-out signals automatically.
By pulling out the knob of D I S P L A Y T I M E , the fixed
read-out speed is applied up to 1 jts/word regardless of
sweep time in read-out operation. Therefore read-out
signals are easy to be seen.
7. Memory signals are readily displayed on the built-in
C R T or recorded in a pen recorder.
8. A
SMOOTHER
waveform
switch
more
easily
has been built-in to
visible
when
make
monitoring
1 4 . By connecting M U - 1 6 5 K - T ) , feeding its output into
HOR INPUT, X - Y operation of real time waveform and
memory waveform can be executed.
1 5 . Large sized, square C R T displays waveforms over the
entire area of the screen.
1 6 . Rigid construction with die casting front panel and
compact design.
17. With the joiner C Z - 8 4 , M S - 1 6 5 0 B and M U - 1 6 5 1
memory unit can be combined into one body, making it
convenient to carry as a dual trace memory
oscilloscope.
memorized signals on the screen; sample intervals
have become joined and smooth.
CONTENTS
FEATURES
2
SPECIFICATIONS
3
C O N T R O L S ON P A N E L S
5
M e a s u r e m e n t of Input S i g n a l T i m e
with Pen Recorder
Free Run Operation
Front Panel
5
Rear Panel
8
A p p l i c a t i o n of Digital M e m o r y S c o p e
12
OPERATION
9
A p p l i c a t i o n of O s c i l l o s c o p e O p e r a t i o n
13
12
Oscilloscope Operation
9
PRECAUTION
20
Digital M e m o r y O p e r a t i o n
9
MAINTENANCE AND ADJUSTMENT
20
— D E L A Y Setting
10
Maintenance
20
R e a d o u t to P e n R e c o r d e r
10
Adjustment
20
OPTION
M e a s u r e m e n t of Input S i g n a l V o l t a g e
with Pen Recorder
2
APPLICATIONS
11
11
11
22
SPECIFICATIONS
Cathode R a y T u b e
Polarity
Type
Positive and negative
E2713B31A
S y n c voltage
Acceleration voltage
INT:
M o r e t h a n 1 div of amplitude o n t h e C R T
Approx. 2 kV
LINE:
Within the specified power supply
EXT:
More than 1 Vp-p
Display area
8 div
x
1 0 div (1 div = 9 . 5 m m )
voltage
S y n c frequency
Vertical A x i s
Sensitivity
INT:
2 0 Hz -
EXT:
DC -
10 MHz
10 MHz
External s y n c input voltage
10 mV/div -
2 0 V/div,
± 1 5 V ( D C + A C peak)
± 5 %
Attenuator
10 mV/div — 2 0 V/div, 1-2-5 sequence
Horizontal A x i s
1 1 r a n g e s , fully adjustable
Operating s y s t e m
D I S P L A Y M O D E selector s w i t c h to X - Y position
Input i m p e d a n c e
1 M0, ± 5 %
2 2 pF ± 3
Sensitivity
pF
1 5 0 mV/div ( ± 2 0 % , HOR. GAIN M A X )
Frequency response
Oscilloscope
Frequency response
D C : D C - 1 0 MHz ( - 3 dB)
(10 mV/div AC:
(10 mV/div Digital m e m o r y
D C - 1 MHz ( - 3 dB) (HOR. G A I N M A X )
Input i m p e d a n c e
1 0 0 k f l ± 2 0 % , 3 5 p F or l e s s
2 0 V/div)
M a x i m u m input voltage
D C : D C - 2 5 0 kHz ( - 3 dB)
AC:
DC:
2 0 V/div)
2 H z - 1 0 MHz ( - 3 dB)
5 0 V ( D C + A C peak, HOR. G A I N M A X )
2 H z - 2 5 0 kHz ( - 3 dB)
Rise time
Memory Unit
3 5 ns (Oscilloscope operation)
Memory
M a x i m u m input voltage
Operating
capacity
1 0 2 4 words ( 1 0 0 words/div)
6 0 0 V p - p or 3 0 0 V ( D C + A C p e a k , at 1 k H z )
Write speed
mode
REAL:
O s c i l l o s c o p e o p e r a t i o n or m e m o r y
DUAL:
Real
time
trace
and
memory
operation
(CHOP
waveforms,
mode
0.1 ms/div — 1 s/div,
free-run
of
EXT:
approx.
MEMORY:
1 /ts/word —
R i s i n g e d g e of E X T C L O C K input signal repetition rate
frequency: Less than 5 0 0 kHz
5 0 0 kHz)
X-Y:
1 3 ranges (equivalent to
10 ms/word)
dual
Memory waveform
High level pulse w i d t h : not less t h a n 1 /*s
readout
L o w level pulse w i d t h : not less t h a n 5 0 0 ns
X - Y s c o p e operation
Rise time, not less than 5 0 0 n s
A / D Converter
Readout speed
Resolution
SCOPE:
Fixed
8 bits
S a m e as write speed
read
out
(at
1 /ts/word
Successive comparison A / D converter
...
PEN:
10 ms/word,
Scale-over
:
8 div vertical s c a l e
S w e e p Circuit
TIME
pulled
20 ms/word
50 ms/word,
3
ranges
( S w i t c h a b l e to 1 0 0 m s / w o r d , 2 0 0 m s / w o r d , 5 0 0 m s /
R i s i n g e d g e of E X T C L O C K input signal repetition rate
frequency: Less than 1 MHz
Sweep system
y
Trigger s w e e p ( N O R M ) , auto s w e e p ( A U T O )
Input signal:
High level pulse w i d t h :
not less t h a n
L o w level pulse width:
not less than
5 0 0 ns
S w e e p time
± 5 %
1-2-5 sequence
5 0 0 ns
1 9 r a n g e s , fully adjustable
Rise time, not less than 5 0 0 ns
Magnifier
5
DISPLAY
w o r d by changing jumper wire connection)
EXT:
1 /zs/div — 1 s / d i v ,
for
position).
Conversion s y s t e m
Input voltage:
MAG±10%
T T L level
M a x i m u m input voltage: 2 0 V ( D C + A C peak)
Linearity
Input resistance: A p p r o x . 3 0 kfi
L e s s t h a n 3 % ( 5 /ts/div — 1 s/div)
L e s s t h a n 5 % (1 /*s/div — 2 jis/div)
Delay
-
D E L A Y ( 0 - 9 div, DIG S W setting)
S y n c Circuit
S y n c input
INT:
Vertical input signal
LINE:
Line frequency
EXT:
E X T T R I G input signal
3
SPECIFICATIONS
Frequency response:
Signal Output
D C — approx. 1 M H z
( - 3 d B ) , S m o o t h e r ; off
Display time
DC—
T h e a m o u n t of time for w h i c h m e m o r y signals are displayed c a n
approx. 1 5 0 kHz
( - 3 dB), Smoother; on
be varied f r o m approx. 1 to approx. 2 0 s e c o n d s .
Input i m p e d a n c e :
M e m o r y out a n d M e m o r y out for p e n ( O u t p u t of only P E N m o d e )
A p p r o x . 6 0 kft
M a x i m u m input voltage: 2 0 V p - p or 1 0 V ( D C + A C p e a k )
Display time
Output w a v e :
Intensity Modulation
Memory w a v e
Output voltage:
1.6 V p - p , full s c a l e (at 8 div)
Input v o l t a g e
O u t p u t r e s i s t a n c e : A p p r o x . 4 3 0 ft
T T L level (Intensity increasing w i t h more positive levels)
Read gate
Input i m p e d a n c e
Output w a v e :
P o s i t i v e p u l s e ( 1 w o r d ) of f i n a l a d d r e s s
Output voltage:
T T L level
A p p r o x . 1 5 kft
Input f r e q u e n c y
Output resistance: Approx. 2 2 0
ft
.
R e a d g a t e for p e n ( O u t p u t of only P E N m o d e )
Output voltage:
DC -
1 MHz
M a x i m u m input v o l t a g e
T T L level ( L O W active)
5 0 V ( D C + A C peak)
O u t p u t r e s i s t a n c e : 2 2 0 ft
P o w e r Requirement
S w e e p gate
Output w a v e :
Positive pulse synchronized w i t h s w e e p signal
Voltage
Output voltage:
T T L level
Power consumption
1 0 0 / 1 2 0 / 2 2 0 / 2 4 0 V , ± 1 0 % , 5 0 / 6 0 Hz
Approx. 6 0 W
O u t p u t r e s i s t a n c e : A p p r o x . 2 2 0 ft
Dimensions
C A L (Calibrating v o l t a g e )
Output w a v e :
1 kHz, ± 1 0 % , square w a v e
Output voltage:
1 Vp-p
Width
± 5 %
Data out
2 8 4 mm (328 mm)
Height
138 m m ( 1 5 3 mm)
Depth
4 0 0 m m ( 4 6 3 mm)
Data output:
(
8 bit b i n a r y p a r a l l e l o u t p u t , p o s i t i v e o u t p u t ( T T L l e v e l )
Timing pulse:
) dimensions include protrusions from basic
case
outline d i m e n s i o n s
Weight
A p p r o x . 9 kg
P o s i t i v e , n e g a t i v e o u t p u t ( M O S ) ( T T L level)
Operating
Read gate out:
Temperature
P o s i t i v e o u t p u t of t h e f i n a l - a d d r e s s one w o r d
Operating temperature for guaranteed specification: 0 ° ~ 4 0 ° C
Output resistance:
Full operating t e m p e r a t u r e : 0 ° ~ 5 0 ° C
A p p r o x . 2 2 0 ft ( T T L l e v e l )
Ext. clock:
Accessory
T T L l e v e l c l o c k i n p u t o f 1 M H z or b e l o w
High level pulse w i d t h :
Not less t h a n 5 0 0 n s
Probe ( P C — 2 2 )
L o w level pulse w i d t h :
Not less t h a n 5 0 0 n s
Attenuation
Rise time:
Not more t h a n 5 0 0 ns
Input i m p e d a n c e
•
Input r e s i s t a n c e :
A p p r o x . 3 0 kft
14-pin cable
receptacle It
Data contents
Pin #
1
Data L S B
Pin #
8
MSB
Pin #
2
BIT 2
Pin #
9
T i m i n g pulse M O S
Pin #
3
BIT 3
Pin # 1 0
Timing pulse M O S
Pin #
4
BIT 4
Pin # 11
EXT. CLOCK
Pin #
5
BIT 5
Pin
12
GND
Pin # ' 6
BIT 6
Pin # 1 3
GND
Pin #
BIT 7
Pin # 1 4
READ GATE OUT
7
ft
Signal Input
M e m o r y in
Sensitivity:
1.6 V p - p , full s c a l e
(200 mV/div)
Memory signal input
(3 inputs for M U - 1 6 5 1 )
4
1.5 A , 2 pieces
0 . 7 A , 2 pieces
PIN CONFIGURATION
Data contents
1/10
1 0 Mft
Less than 18 pF
Replacement fuse
14-pin cable
receptacle #
1 piece
Instruction manual
1 copy
A C cord
1 piece
Digital o u t p u t plug
1 piece
Option
Joiner C Z - 8 4
C O N T R O L S ON PANELS
C O N T R O L S ON F R O N T P A N E L
1 . P O W E R / S C A L E ILLUM
Power switch and scale illumination control. Fully
counterclockwise rotation of this control turns off
oscilloscope. Clockwise rotation turns on oscilloscope.
Further clockwise rotation of this control increases the
illumination level of the scale.
2. LED PILOT LAMP
Lights w h e n oscilloscope is turned on.
3. I N T E N S I T Y
Intensity control. Adjusts the brightness of spot and
waveforms for easy viewing. A left turn allows the
waveforms to disappear.
4. T R A C E ROTATION
This control is used to eliminate inclination of horizontal trace.
5. F O C U S
Spot focus control to obtain optimum waveform according to brightness.
6. C A L
7. GND T E R M I N A L
Earth terminal of the oscilloscope.
8. V O L T S / D I V
Vertical attenuator calibrated in voltage per division. In
the extreme clockwise ( C A L ) position, the vertical attenuator is calibrated.
Select the position of the control according to the
magnitude of input voltage to obtain the optimum
waveform.
Vertical sensitivity is calibrated in 11 steps from 0 . 0 1
to 2 0 volts per div.
9. V A R I A B L E
Fine adjustment control of vertical sensitivity. T h e sen, -*'sitivity within the 11 ranges of V O L T S / D I V (8) is continuously
adjustable. T h e extreme clockwise ( C A L )
position is used to calibrate the vertical attenuator.
1 0 . t POSITION
The rotation of this control adjusts vertical position of
real time waveform as desired. A right turn of this control will shift the real time w a v e f o r m upward, and vice
versa.
Provides 1 kHz, 1 volt peak-to-peak square w a v e output signal. This is used for calibration of the vertical
amplifier attenuators and to check the frequency compensation adjustment of the probes used with the
oscilloscope.
5
C O N T R O L S ON PANELS
16. S T A R T
1 1 . MEMORY POSITION, PUSH MEMORY FREEZE
Vertical position
of
memory
waveform
A pushbutton s w i t c h to write input signal in memory.
adjustment
T o use this s w i t c h , set D I S P L A Y MODE to R E A L or
knob.
A right turn of this control will move the memory
DUAL,
waveform upward, and vice versa.
T I M E / D I V to 0.1 ms-1 s . In the PEN mode, this switch
When this control
memory
becomes
is pushed, only the
FREEZE;
in
write
condition,
memory.
to
INT and
SCOPE,
and
SWEEP
functions as the PEN S T A R T push button s w i t c h .
main unit
memorized waveform is preserved and cannot write in
CLOCK
1 7 . T R I G G E R POINT - D E L A Y
(DIV)
This switch is used to write input signal in memory
/ "
A t pulled out condition, write-in to main unit memory
before trigger signal is generated. T h e setting range
becomes possible.
covers from 0 div. to 9 div. 1 div. represents 1 0 0
words in memory.
12. DISPLAY MODE
This switch selects the modes of vertical and horizontal operations.
REAR:
For normal oscilloscope operation. Also, used to write a signal in memory.
DUAL:
This mode for switching between real time
waveform and memory waveform through
C H O P operation at approx. 5 0 0 kHz and
monitoring both waveform. Write-in to
memory can only be accomplished through
manual operation of S T A R T (16) s w i t c h .
(Refer to " - D E L A Y S e t t i n g " on page 10)
1 8 . W R I T E (LED)
Red LED lights while input signal is being written in
memory.
1 9 . R E A D (LED)
Green LED lights while memory data is being read out.
20. MEMORY OUTPUT
Memory data output terminal. Readout speed is varied
according to 3 readout modes, S C O P E , PEN and E X T
CLOCK.
M E M O R Y : For readout of memory waveform.
X-Y:
For X - Y oscilloscope.
13. AC-GND-DC
2 1 . S W E E P TIME/DIV
Vertical input selector s w i t c h . A C position blocks DC
Horizontal sweep time selector. It selects sweep times
component of input signal. GND position opens signal
of 1 fis to 1 s in 19 steps. The 1 /is-50 /is range is us-
input path and grounds amplifier input. DC position
ed for real time.
directs input of A C and DC components to amplifier.
When the D I S P L A Y MODE is set to R E A L or D U A L , a
2 2 . VARIABLE/HOR. GAIN
trace appears on the scope in GND position of A C -
Used for fine adjustment of sweep time. Continuous
adjustment between 19 ranges of S W E E P TIME/DIV
(21) is possible. S w e e p time is calibrated at the extreme clockwise position ( C A L ) . When the D I S P L A Y
MODE is set to X - Y , the signal from the HOR INPUT is
attenuated by S W E E P / T I M E DIV. control.
GND-DC switch regardless of the position of the PULL
AUTO (27).
1 4 . INPUT
Vertical input terminal.
15. CLOCK
23.
I N T / E X T : Clock selector s w i t c h . Write-in and read-out
occures via the clock inputted at the E X T
C L O C K (35) terminal. In this position, the
waveform on the scope cannot be synchronized. INT position is used for write and
readout. There are t w o functions, S C O P E
and PEN (readout only)
SCOPE/PEN:
Memory readout mode selector s w i t c h .
In S C O P E position, readout on the screen is
effected repeatedly.
In pen position, readout to M E M O R Y O U T
terminal is effective each time S T A R T is
depressed. For write mode, use the S C O P E
position.
The memory data from the initial address to
final address are read out once by pressing
this s w i t c h .
6
POSITION
Rotation adjusts the horizontal position of trace as
desired. Clockwise rotation shifts the trace to the right
and counterclockwise rotation, to the left
2 4 . FINE P U L L X 5 M A G
Horizontal position fine adjuster and sweep magnification selector s w i t c h . Pull the knob and the trace is
magnified five times as large in the left and right directions. Brightness is slightly decreased.
Input signal stored in the memory is not magnified
even in the X 5 M A G position.
C O N T R O L S ON PANELS
25. SOURCE
29. EXT TRIG
Sync source voltage selector switch for three functions,
INT (internal sync), LINE ( 5 0 / 6 0 Hz sync) and E X T (external sync).
INT:
LINE:
S w e e p is triggered by vertical input signal.
S w e e p is triggered by 5 0 / 6 0 Hz power frequency.
EXT:
S w e e p is triggered by voltage applied to
E X T T R I G terminal and D C component.
26. SLOPE
S y n c polarity selector s w i t c h . In the " + " position,
sweep is triggered with rising slope of input waveform,
and in t h e " — " position, with falling slope of input
waveform.
Input terminal for external trigger signal. External trigger signal (1 Vp-p or higher) should be applied with
S O U R C E s w i t c h set to E X T .
30. HOR INPUT
Input terminal for external horizontal signal. D I S P L A Y
MODE s w i t c h should be set to X - Y .
31. DISPLAY TIME
Store and read-out operation are automatically
repeated w h e n this knob is pulled out (free run
fuction). The display time is about 1 second when the
knob is fully set to the left and about 2 0 seconds when
it is fully set to the right. This function is effective only
when the D I S P L A Y mode is R E A L .
27. LEVEL, PULL AUTO
Triggering level control adjusts s y n c phase to determine the starting point of sweep on the slope of trigger
signal waveform. B y pulling the knob toward you, auto
sweep is effected; the sweep is set in free-run state
and the trace is displayed on C R T even when no trigger
signal is present. When trigger signal is present, sweep
is started so the triggering level can be adjusted.
32. PEN SPEED
Selects the memory read speed in the PEN mode from
among three speeds: 10 to 5 0 ms/word. This switch
functions regardless of the position of S W E E P TIME/DIV
(21).
28. TRIG'D
S y n c indication lamp lights w h e n s y n c signal is triggered. Check this lamp lights when writing input singal
to memory.
The lamp may light in the GND position of the A C GND-DC ( 1 3 ) . T h i s is normal and is not an indication
that the unit is defective.
7
C O N T R O L S ON PANELS
C O N T R O L S ON R E A R P A N E L
33. SWEEP G A T E OUT
4 1 . DATA OUT
S w e e p gate signal (positive pulse) is available at this
terminal.
34. READ GATE OUT
Output terminal for memory data (8 bit BINARY) and
timing signal.
42. POWER CONNECTOR
Positive pulse for one word of final memory address is
available at this terminal.
The signal can be used as a stop signal when a pen
recorder is used.
For connection of accessory power cord.
4 3 . FUSE HOLDER
For
100/120 V
operation,
use a
1.5A
fuse. For
2 2 0 / 2 4 0 V operation, be sure to use a 0 . 7 A fuse.
35. EXT CLOCK
44. POWER VOLTAGE SELECTOR
Input terminal for external clock.
Set the selector to the position corresponding to the
C L O C K switch (1 5) should be set to E X T .
correct A C power voltage, 1 0 0 / 1 2 0 / 2 2 0 / 2 4 0 V .
3 6 . Z - A X I S INPUT
Intensity modulation terminal. Intensity is modulated
at T T L level.
4 5 . CORD REEL
Wind the power cord in the reel when the oscilloscope
needs to be transported or it is to be left unused.
37. SMOOTHER
When slided this switch to ON side, the sample
waveform becomes joined and makes visible.
4 6 . M E M O R Y (FOR PEN OUT)
This output terminal is only effective for PEN mode.
When S T A R T (16) is pressed, output of the same data
3 8 . GND
Ground terminal. Oscilloscope chassis ground,
earth ground.
as that of M E M O R Y O U T P U T (20) starts.
and
3 9 . M E M O R Y INPUT
Three input terminals for memorized signals when connecting M U - 1 6 5 1 memory unit and using as a mutiple
trace memory oscilloscope.
40. CONTROL OUTPUT
Control signal output terminal for memorized signal
when connecting M U - 1 6 5 1 memory unit and using as
a mutiple trace memory oscilloscope.
8
4 7 . R E A D G A T E (FOR PEN OUT)
This is valid only in PEN mode. This terminal outputs
the same signal as that R E A D G A T E ( 3 4 ) . This output
signal drops to the GND level to start pen operation,
and rises to the H level to stop pen operation when
reading is finished. The terminal is grounded in the
S C O P E mode.
OPERATION
OSCILLOSCOPE OPERATION
DIGITAL MEMORY OPERATION
Refer to the previous section "Controls on P a n e l s " . Before
operating the oscilloscope, set the switches and controls
as follows:
Set the s w i t c h e s and controls as follows before using the
digital memory:
S w i t c h e s and Controls
Other knobs and controls are the same in function as those
of oscilloscope operation.
Position
1 . P O W E R / S C A L E ILLUM
3. INTENSITY
S w i t c h e s and Controls
OFF
Center
11.
Position
M E M O R Y POSITION
Pull mechanical
center
12.
D I S P L A Y MODE
R E A L or D U A L
15.
17.
CLOCK
T R I G G E R POINT
INT/SCOPE
0
21.
27.
SWEEP TIME/DIV
LEVEL
31.
32.
DISPLAY TIME
PEN S P E E D
(slightly right)
5.
8.
9.
10.
12.
13.
21.
22.
23.
24.
25.
26.
27.
31.
FOCUS
Center
20 V
VOLTS/DIV
VARIABLE
Full clockwise
Center
t POSITION
D I S P L A Y MODE
REAL
GND
AC-GND-DC
S W E E P TIME/DIV
VARIABLE
<o
1 ms
0.1 ms — 1 s
N O R M A L (PUSH)
PUSH
10 m s , 2 0 m s ,
Full clockwise
Center
POSITION
50 ms/word
FINE P U L L x 5 M A G
SOURCE
SLOPE
Center (PUSH)
INT
[A] Manual Operation
+
1 . Operate the oscilloscope and display a triggered signal
LEVEL
Center (PULL) A U T O
PUSH
2. Depress the W R I T E S T A R T ( 1 6 ) and the W R I T E ( 1 8 )
DISPLAY TIME
on the screen.
lamp will light.
3. When the W R I T E lamp goes off, the R E A D (19) lamp
1 . Connect the supplied power cord to the power connecter. T h e oscilloscope is factory adjusted to operate
on A C 2 4 0 V .
memory w a v e f o r m will be displayed. In the D U A L mode,
2. Turn the P O W E R switch (1) to ON and the POWER lamp
(2)
will
begins to flicker.
4. Set the D I S P L A Y MODE (12) to D U A L or M E M O R Y , and
light. T h e n horizontal trace will appear. If
the real time
waveform.
horizontal trace does not appear at the center of the
MEMORY
screen, adjust the T POSITION ( 1 0 ) .
observed.
3. Adjust the intensity by the INTENSITY (3). If the trace is
unclear, adjust the F O C U S ( 5 ) .
waveform overlaps with the
B y adjusting
the
memory
T P O S I T I O N ( 1 0 ) or
POSITION ( 1 1 ) , both waveforms can be
5. W h e n observing memory w a v e f o r m , it is not necessary
to adjust the V O L T S / D I V (8) and S W E E P TIME/DIV
4 . If the trace is inclined, adjust the T R A C E R O T A T I O N ( 4 ) .
(21). T h e V O L T S / D I V does not change the amplitude of
5. Set the A C - G N D - D C (13) to A C or DC position and app-
the memory waveform. T h e S W E E P T I M E / D I V changes
ly input signal to the INPUT ( 1 4 ) . Turn the V O L T S / D I V
only the readout speed; the memory waveform remains
(8) clockwise to obtain optimum waveform.
unchanged on the screen.
6. If the waveform is running and not triggered, turn the
L E V E L ( 2 7 ) . By pushing the L E V E L knob, the auto func-
[B] Automatic write-in, read-out Operation
tion is released. T h e waveform disappears when the
Pull out the D I S P L A Y T I M E ( 3 1 ) forward you and set this
knob is turned clockwise or counterclockwise and ap-
control at about 9 o'clock position in F R E E RUN state.
pears again at the approximate midposition of it. Turn
Refer to F R E E RUN function on page 1 1 .
the knob until optimum triggering level is obtained.
7. When the signal voltage is more than 0 . 0 1 V and
waveform
does
not
appear
on
the
screen,
the
oscilloscope may be checked by feeding input from the
C A L (6) terminal. Since the calibration voltage is 1 Vpp, the waveform becomes 5 div at the 0 . 2 V position of
the V O L T S / D I V .
8. In measuring D C component, set the A C - G N D - D C (13)
to
D C . If
it
contains
positive
( + } potential,
the
waveform moves upward. If negative ( —) potential is
contained, the waveform moves downward. The zero
potential can be checked at the GND position.
9
OPERATION
— DELAY Setting
With
conventional
oscilloscopes, it
is not
possible
to
When a trigger point indicated by the setting T R I G G E R
observe a trace before triggering signal is developed.
POINT switch (17) appears on the scale, the oscilloscope
This oscilloscope has " — D E L A Y "
provides a negative delay of up to
function
to store a
waveform in memory before triggering signal is developed,
9 div. When the
— D E L A Y switch is " 6 " position, the memory waveform is
thus permitting a wide variety of applications. The numbers
as shown in Fig. 1 .
indicated by the setting T R I G G E R POINT switch (17) cor-
Note:
respond to the horizontal scale divisions so that
When the — D E L A Y is set for one-shot signal observation,
trigger
points can be easily checked on the scope.
be sure to press the L E V E L (27) to NORMAL T R I G G E R
The diagram below s h o w s the — D E L A Y points indicated by
(PUSH) and then press write S T A R T (16)
the setting T R I G G E R POINT switch ( 1 7 ) .
« T R I G G E R POINT
SLOPE
LEVEL
DISPLAY
6
+PUSH
MODE
MEMORY
Trigger level
Memory w a v e f o r m
W a v e f o r m before
triggered
Waveform
after
triggered
Trigger point
T h e left 6 div w a v e f o r m is memory w a v e f o r m ( 6 0 0 words)
before triggered. T h e right 4 div w a v e f o r m is a memory
w a v e f o r m ( 4 0 0 words) after triggered.
T h e — D E L A Y setting s w i t c h is used in conjunction with the
scale. W h e n the — D E L A Y is set to 6 , the trigger point is the 6th
division from the left end of the scale.
Fig. 1
Read-out to Pen Recorder
This oscilloscope permits any high speed traces to be
stored in memory and converted into slow speed time base
which a recorder is able to follow. T h u s , it is possible to
record a memory data in a recorder at a speed suitable to
the recorder's response.
The standard readout speeds are 1 0 m s / w o r d , 2 0 m s / w o r d
and 5 0 m s / w o r d but can be applied to 1 0 0 m s / w o r d ,
2 0 0 m s / w o r d and 5 0 0 m s / w o r d by changing the connections of the jumper wire in control circuit board (Fig. 2 ) .
T o record a memory data in a pen recorder, perform the
following procedures:
10
1 . Operate the digital memory and write input signal in
memory.
2 . Set 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 mode while the F R E E RUN function is being used.
3 . Connect the pen recorder to the M E M O R Y O U T FOR
PEN.
4 . Set the C L O C K to INT/PEN.
5. Depress the S T A R T , and the memory waveform is read
out. T h e readout is completed at 1 0 2 4 words and is set
in the D/A conversion saturating point. T o resume the
readout, depress the S T A R T once again.
OPERATION
C10ms
10ms^
/
word
20ms/
word
l^50ms /
word
Control board
C100
ms /
word
100 m s •< 2 0 0 m s /
word
1^500 m s /
word
Power
supply
board
Bottom
view
Fig. 2
Measurement of Input Signal Voltage with Pen Recorder
To obtain input signal voltage V from the waveform recorded by the pen recorder, use the following equation:
Pen recorder input level (V/cm) x Recorded amplitude (cm)
V(v)
=
x Write input level (V/div)
0.2 (V/div)
Measurement of Input Signal Time with Pen Recorder
To obtain write signal time T from the waveform recorded by the pen recorder, use the following equation:
T(sec/cm) =
Pen recorder feed speed (sec/cm)
Readout speed (sec/div)
x Write speed (sec/div)
FREE RUN function
Pressing and holding the write S T A R T button for one
T h i s function is used to automatically repeat store and read
repetition of the store and read input waveform data cycle
operations. T h e period for which the input waveform data
temporarily suspends the automatic free run function in the
is stored in the memory can be varied from about A to 20
memory read state. Press and then pull the D I S P L A Y T I M E
seconds with the D I S P L A Y T I M E knob; this is convenient
knob, or set the D I S P L A Y MODE switch to the M E M O R Y
when it is necessary to observe consecutive phenomena
(or D U A L ) position, then to the R E A L position to restart the
without observer intervention.
automatic free run function.
By pulling the D I S P L A Y T I M E knob ( R E A L position), the
Note:
F R E E RUN functions.
The F R E E RUN function will not a l w a y s start by turning
Depressing the D I S P L A Y T I M E knob resets the free run
on the P O W E R switch with the D I S P L A Y T I M E knob in
function and sets the R E A L mode.
the pull out position.
11
APPLICATIONS
This instrument has a digital memory function to analyze
Application to Electric Circuit Measurement of relay
chattering
various waveforms which is not possible with conventional
The operating method is the same as noted in the previous
oscilloscopes. T h e following s h o w s typical examples of the
section.
APPLICATIONS OF DIGITAL MEMORY SCOPE
use of the digital memory scope.
Contact
Detector
Load
,INPUT|
AMP ]
INPUT,
Relay
Device under
test
S e t L E V E L knob
to N O R M A L
S e t LEVEL knob
to NORMAL
* S e t D E L A Y to 2 ~ 5 divisions.
Fig. 4 .
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 of
M e a s u r e m e n t of relay c h a t t e r i n g
mechanical impact waveforms
Data recording with pen recorder
Setting of the Digital Memory Scope
1 . Connect the detector to the device under test, then connect 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.
Connect to R E A D out terminal
'
at the rear panel
2 . Operation of the scope
(1)
"FOR PEN
range
Input Selector: Set to A C or DC position (set to
either position according to the input signal being
applied).
Vertical attenuator (VOLTS/DIV): A n y position.
Pen Recorder
(X-Y Recorder)
Y input terminal
Memory
O U T terminal
(2) D I S P L A Y MODE: 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, trigger point and s w e e p speed a s s h o w n below.
LEVEL knob: N O R M A L — The input signal is swept once
and stops.
Recorder
START/STOP
control terminal
Fig. 5 .
D a t a recording with pen recorder
To record memory data with pen recorder ( X - Y recorder),
make connection as shown in Fig. 7 and operate the scope
as follows:
and
1 . Change the position of the C L O C K mode switch 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.
TRIGGER POINT ( - D E L A Y / D I V ) : This digital switch is used
to record a signal prior to triggering and should be
set to 0 — 9 div.
2. Set the PEN S P E E D knob to either the 1 0 , 2 0 or 5 0 ms
position.
SWEEP
TIME/DIV: A n y
0.1 m s .
CLOCK: INT
S C O P E PEN: S C O P E
position
between
0.1 s
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. Test the data. When 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 waveform being stored, set the D I S P L A Y
MODE switch to D U A L or M E M O R Y position.
12
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".
APPLICATIONS
Readout from external CLOCK
APPLICATIONS OF OSCILLOSCOPE OPERATING
Phase Measurement
When the scope is operated with external C L O C K , it functions only as a readout scope and does not function as a
Phase measurements may be made with an oscilloscope.
Typical applications are in circuits designed to produce a
specific phase shift, and measurement of phase shift
distortion in audio amplifiers or other audio networks.
Distortions due to non-linear amplification is also displayed
in the oscilloscope w a v e f o r m .
write-in scope. T h e readout function is useful when observing a magnified waveform (magnified to H O R x 5 M A G ) .
In this case, the S W E E P T I M E / D I V is disabled so the
waveform
display
remains the same, except that
the
sweep speed is varied. It is also used to read out the
M E M O R Y O U T signal to an external device at a speed other
A sine w a v e input is applied to the audio circuit being
tested. T h e same sine w a v e input is applied to the vertical
input of the oscilloscope, and the output of the tested circuit is applied to the horizontal input of the oscilloscope.
The amount of phase difference between the t w o signals
can be calculated from the resulting Lissajous' waveform.
To make phase measurements, use the following procedures (refer to Fig. 7 ) .
than the s c o p e ' s readout speed (INT C L O C K ) , or to transfer
the data word by word by connecting digital output, to the
external device (see Fig. 6).
(Clock of less than 1 MHz)
EXT CLOCK terminal at
the rear panel
Digital device
Digital output
(option)
(8 pit Binary)
Set CLOCK MODE
to EXT
Fig. 6 . Transfer of digital signal data word by word
to another digital device using external clock
Adjust V. gain for
convenient viewing
height
Audio signal
generator
X-Y •
AC-
t3"
Audio
network
being tested
Fig. 7
Load
Typical phase measurement
13
APPLICATIONS
1 . Using an audio signal generator with a pure sinusoidal
signal, apply a sine w a v e test signal to the audio network being tested.
2 . Set the signal generator output for the normal operating
level of the circuit being tested. Observe the circuit's output on the oscilloscope and if the test circuit is overdriven,
the sine w a v e display is clipped and the signal level must be
reduced.
3 . Connect the HOR. INPUT to the output of the test circuit.
B
4 . Set the D I S P L A Y MODE to X - Y .
5. C o n n e c t
the
probe
to
the
SINE
input
of
the
test
circuit.
WHERE
0
•= —
A
<t> =
PHASE ANGLE
6. Adjust the vertical and horizontal gain controls for a
suitable viewing size.
7. Some typical results are s h o w n in Fig. 8. If the t w o
Fig. 9 .
Phase shift calculation
signals are in phase, the oscilloscope trace is a straight
line. If the vertical and horizontal gain are properly adjusted, this line is at 4 5 ° angle. A 9 0 ° phase shift produces a circular oscilloscope pattern. Phase shift of less
(or more) than 9 0 ° produces an elliptical Lissajous' pattern. T h e amount of phase shift can be calculated by the
method s h o w n in Fig. 9 .
W h e n , in particular, the M U - 1 6 5 1 memory unit is con-
Frequency Measurement
1 . Connect the sine w a v e of known frequency to the vertical input of the oscilloscope and set the D I S P L A Y
MODE s w i t c h to X - Y .
2. Connect the vertical input probe to the signal to be
measured.
be
3 . Adjust the vertical input and horizontal input for proper
sizes.
When three M U - 1 6 5 K - T ) units are used, X - Y operation
4 . T h e resulting Lissajous' pattern s h o w s the ratio between
the t w o frequencies (see Fig. 1 0 ) .
nected and its M E M O R Y O U T is applied to HOR INPUT,
the
phase
of
two
memorized
waveforms
can
calculated.
between each trace can be executed. A t such times,
turn off S M O O T H E R s w i t c h ( 3 7 ) . Refer to I N S T R U C TION M A N U A L on M U - 1 6 5 1 in details.
UNKNOWN FREQUENCY
TO V E R T I C A L INPUT.
STANDARD FREQUENCY
TO H O R I Z O N T A L INPUT
NO AMPLITUDE DISTORTION
NO PHASE SHIFT •
RATIO O F
UNKNOWN
TO
STANDARD
S E E NOTE
W : 1
S E E NOTE
1
AMPLITUDE DISTORTION
NO PHASE SHIFT
1V4
180 OUT OF PHASE
NOTE
: '1
:
1
ANYONE OF T H E S E FIGURES D E P E N D I N G UPON
PHASE RELATIONSHIP
90 OUT OF PHASE
Fig. 8 . Typicl phase measurement oscilloscope
displays
14
1
NO AMPLITUDE DISTORTION
PHASE SHIFT
6
AMPLITUDE DISTORTION
PHASE SHIFT
:
Fig. 1 0 . Lissajous' waveforms used for frequency
measurement
APPLICATIONS
low frequencies. Because of the harmonic content of the
square w a v e , distortion will occur before the upper end of
the amplifier bandpass.
Amplifier Square Wave Test
Introduction
A square w a v e generator and the oscilloscope can be used
to observe various types of distortion present in electric circuits. A square w a v e of a given frequency contains a large
number of odd harmonics of that frequency. If a 5 0 0 Hz
square w a v e is injected into a circuit, frequency components of 1.5 kHz, 2 . 5 kHz and 3 . 5 kHz are also provided. Since vacuum tubes and transistors are non-linear, it is
difficult to amplify and reproduce a square w a v e which is
identical to the input signal. Inter electrode capacitances,
junction capacitances, stray capacitances as well as narrow band devices and transformer response are the factors
which prevent faithful response of a square w a v e signal. A
welldesigned amplifier can minimize the distortion caused
by these limitations. Poorly designed or defective
amplifiers can introduce distortion to the point where their
performance is unsatisfactory. A s stated before, a square
w a v e contains a large number of odd harmonics. By injecting a 5 0 0 Hz sine w a v e into an amplifier, w e can evaluate
amplifier response at 5 0 0 Hz only, but by injecting a
square w a v e of the same frequency w e can understand
how the amplifier would response to input signals from
5 0 0 Hz up to the 1 5th or 2 1 s t harmonic.
The need for square w a v e evaluation becomes apparent if
w e realize that some audio amplifiers will be required during
normal use to pass simultaneously a large number of different frequencies. With a square w a v e , w e can evaluate
the quality of input and output characteristics of a signal
containing a large number of frequency components such
as complex w a v e f o r m s of musical instruments or voices.
The square w a v e output of the signal generator must be
extremely flat. T h e oscilloscope vertical input should be set
to DC as it will introduce the least distortion, especially at
It should be noted that the actual response check of an
amplifier should be made using a sine w a v e signal. This is
especially important in an limited bandpass amplifier such
as a voice amplifier.
The square w a v e signal provides a quick check of amplifier
performance and will give an estimate of overall amplifier
quality. T h e square w a v e also will reveal some deficiencies
not readily apparent w h e n using a sine w a v e signal.
Whether a sine w a v e or square w a v e is used for testing the
amplifier, it is important that the manufacturer's specifications on the amplifier are based on in order to make a better
judgement of its performance.
Testing Procedure (refer to Fig. 1 1 ) :
1 . Connect the output of the square w a v e generator to the
input of the amplifier being tested.
2 . Connect the vertical input probe of the oscilloscope to
the output of the amplifier.
3 . If the D C component of the amplifier output is low, set
the A C - G N D - D C s w i t c h to DC position to allow both the
A C and D C components to be v i e w e d . However, the A C
position may be used to observe the A C component only, though this will reduce the audio frequency content
of less than 5 Hz.
4 . Adjust the vertical gain controls for a convenient viewing height.
5. Adjust the s w e e p time controls for one cycle of square
w a v e display on the screen.
6. For a close-up v i e w of a portion of the square w a v e , use
the X 5 magnification.
Square w a v e
generator
Adjust sweep
speed for 1
c y c l e display
A d j u s t V. gain
for convenient •
v i e w i n g height
DC
INT
+SLOPE
INPUT
Fig. 1 1 .
Amplifier
circuit being
tested
OUTPUT
E q u i p m e n t s e t - u p for s q u a r e w a v e testing of
amplifiers
15
APPLICATIONS
Analysing the Waveforms:
The short rise time which occurs at the beginning of the
half-cycle is created by the in-phase sum of the medium
and
high frequency sine w a v e components. T h e same
holds true for the drop time. T h e reduction in high frequency components should produce a rounding of the square
corners at all four points of one square w a v e cycle (see Fig.
12).
Distortion
can
be
classified into
the
following
three
categories:
1 . T h e first is frequency distortion and refers to the change
in the amplitude
of a complex waveform. In other
words, the introduction in an amplifier circuit of reso-
Fig. 12.
S q u a r e w a v e r e s p o n s e with high frequency
loss
nant networks or selective filters created by combination of reactive components will create peaks or dips in
an otherwose flat frequency response curve.
2. The second is non-linear distortion
and refers to a
change in w a v e s h a p e produced by application of the
waveshape to
non-linear elements such as vacuum
tubes, an iron core transformer or a clipper network.
3 . The third is delay or phase distortion, which is distortion
produced by a shift in phase between some components
of a complex w a v e f o r m .
is usually caused by a frequency
selective network w h i c h includes capacity, inductance
or both. The presence of the C or L introduces a dif-
RESPONSE
In actual practice, a change in amplitude of a square
w a v e component
ference in phase angle between components, creating
phase distortion or delay distortion. Therefore, in square
w a v e testing of practical circuitry, w e will usually find
that the distorted square w a v e includes a combination
of amplitude and phase distortions.
In a typical wide band amplifier, a square w a v e check
Fig. 1 3 .
R e s p o n s e c u r v e of a m p l i f i e r w i t h p o o r l o w
and high e n d s
reveals many distortion characteristics of the circuit.
The response of an amplifier is indicated in Fig. 1 3 ,
revealing poor low-frequency response along with the
overcompensated high-frequency boost. The response
of 1 0 0 Hz square w a v e applied to the amplifier will appear as in Fig. 1 4 A . T h e figure indicates satisfactory
medium frequency response (approximately 1 kHz to
2 kHz) but s h o w s poor low frequency response. Next, a
1 kHz square w a v e applied to the input of the amplifier
B
A
will appear as in Fig. 1 4 B . This figure displays good frequency response in the region of 1 0 0 0 to 4 0 0 0 Hz but
reveals a sharp rise at the top of the leading edge of the
square w a v e because of overcompensation at the frequencies of more than 1 0 kHz.
A s a rule of thumb, it c a n be safely said that a square w a v e
can be used to reveal response and phase relationships up
to the 1 5th or 2 0 t h odd harmonic or up to approximately
4 0 times the fundamental of the square w a v e . It is seen
that wide-band circuitry will require at least t w o frequency
check points to properly analyze the entire bandpass.
In the case illustrated by Fig. 1 3 , a 1 0 0 Hz square w a v e
will encompass components up to about 4 kHz. T o analyze
above 4 kHz and beyond 1 0 , 0 0 0 Hz, a 1 kHz square w a v e
should be used.
16
100 HZ
1 KHZ
SQUARE
WAVE
SQUARE
WAVE
Fig. 1 4 .
Resultant 1 0 0 Hz and 1 kHz square w a v e s
f r o m amplifier in F i g . 13.
APPLICATIONS
Now, the region between 1 0 0 Hz and 4 0 0 Hz in Fig. 1 3
s h o w s a rise from poor low-frequency ( 1 0 0 0 Hz to 1 kHz)
response to a flattening out from beyond 1 0 0 0 and
4 0 0 0 Hz. Therefore, <we c a n expect that the higher frequency components in the 1 0 0 Hz square w a v e will be
relatively normal in amplitude and phase but that the lowfrequency components "B" in this same square w a v e will
be modified by the poor low-frequency response of this
amplifier (see Fig. 1 4 A ) .
If the amplifier were such a s to only depress the low frequency components in the square w a v e , a curve similar to
Fig. 1 5 would be obtained. However, reduction in
amplitude of the components is ususally caused by a reactive element, causing, in turn, a phase shift of the components, producting the tilt a s shown in Fig. 1 4 A .
Fig. 16 reveals a graphical development of a similarly tilted
square w a v e . T h e tilt is seen to be caused by the strong influence of the phase-shifted 3rd harmonic. It also becomes
evident that very slight shifts in phase are quickly shown
up by tilt in the square w a v e . Fig. 17 indicates the tilt in
square w a v e produced by a 1 0 ° phase shift of a lowfrequency element in a leading direction. Fig. 1 8 indicates a
1 0 ° phase shift in a low-frequency component in a lagging
direction. T h e tilts are opposite in the t w o cases because of
the difference in polarity of the phase angle in the t w o
cases as can be checked through algebraic addition of components.
Fig. 19 indicates low-frequency components which have
been reduced in amplitude and shifted in phase. It will be
noted that these examples of low-frequency distoriton are
characterized by change in shape of the flat portion of the
square w a v e .
F i g . 15- Reduction of square wave fundamental
frequency component in turned circuit
F x
3
F x 3 OUT O F P H A S E ( L E A D )
Fig. 1 4 B s h o w s a high-frequency overshoot produced by
rising amplifier response at the high frequencies. It should
again be noted that this overshoot makes itself evident at
the top of the leading edge of the square w a v e . The sharp
F i g . 16.
Square wave tilt resulting from 3 r d
harmonic phase shift
rise of the leading edge is created by the summation of a
large number of harmonic components. If an obnormal rise
in amplifier response occurs at high frequencies, the high
frequency components in the square w a v e will be amplified
larger
than
the other
components
creating
a higher
algebraic s u m along the leading edge.
F x
1
Fig. 2 0 indicates high-frequency boost in an amplifier a c companied by a lightly damped " s h o c k " transient. In this
case, the sudden transition in the square w a v e potential
from a sharply rising, relatively high frequency voltage, to a
level value of low-frequency voltage, supplies the energy
for oscillation in the resonant network. If this network in
the amplifier is reasonably heavily damped, then a single
cycle transient oscillation may be produced as indicated in
F X 1 OUT OF P H A S E ( L E A D )
Fig. 2 1 .
Fig. 2 2 summarizes the preceding explanations and serves
as handy reference.
Fig. 17.
Tilt resulting from phase shift of fundamental frequency in a leading direction
17
APPLICATIONS
F x 1 OUT OF PHASE (LAG)
Fig. 18
Tilt resulting from a phase shift of fundamental frequency in a lagging direction
Fig. 20.
Effect of high-frequency boost and poor
damping
Fig. 19.
Low frequency component loss and
phase shift
Fig. 21.
18
Effect of high-frequency boost and
good damping
APPLICATIONS
A . Frequency distortion (amplitude reduc- B .
tion of low-frequency component). No i
phase shift.
D. L o w - f r e q u e n c y phase shift.
G . High-frequency loss and phase shift.
Fig. 2 2 .
L o w - f r e q u e n c y boost
(accentuated fun- C .
High-frequency loss — No phase shift.
damental).
E.
L o w - f r e q u e n c y loss and phase shift.
H. Damped oscillation.
F. High-frequency
phase shift.
loss
and
low-frequency
I. L o w - f r e q u e n c y phase shift (trace thickened by hum-voltage).
S u m m a r y of w a v e f o r m a n a l y s i s for s q u a r e w a v e t e s t i n g a m p l i f i e r s
PRECAUTIONS
When input signal contains the element of one half or less
of the sampling frequency (at 10 m sec/div, 10 kHz by
0.1 m s e c , or 1/100 of 10 m s e c ) , even though this is in
the critical range in use, a phenomena (Aliasing) will occur
by which as if some element other than input signal, which
in fact does not exist, is indicated in the frequency range of
one half or less of the sampling frequency.
19
PRECAUTIONS
1 . Do not expose the unit to direct sunlight.
7. T o prevent electrical shocks, be sure to connect the
2 . Install the unit in a cool, dust-free place.
GND ( on the front panel) to an appropiate earth point.
3 . Avoid installing the unit in locations subject to vibrations, strong electric fields and impact voltages.
8 . When the S M O O T H E R s w i t c h (37) is ON, the frequenc y response of the vertical axis amplifier for memoriz-
4 . Do not apply input voltage exceeding their maximum
ed signals drops. T h e number of memorized waveform
ratings.
peaks on the screen is great or the rising speed of
The input voltage applied to the vertical amplifier
waveform
should not exceed 6 0 0 Vp-p or 3 0 0 V (DC +
smaller than those of memorized signals.
AC
peak), E X T C L O C K is up to 2 0 V and the input to E X T
is rapid, their
amplitudes
may
become
9. T h e handle of the unit can be set to the desired angle
T R I G is up to 2 0 V ( D C + A C peak).
so that the unit is inclined for easy operation. The han-
Do not connect external voltage to any output ter-
dle turns in 1 5 degree steps.
minals.
Do not put any objects on the top of the unit or cover
5. Do not increase the intensity more than necessary.
6. When the unit is to be left unused with the bright spot
on the screen, turn down the INTENSITY control and
F O C U S control.
the ventilation holes of the case, as it will increase the
temperature in the case.
1 0 . Automatic s w e e p starts by changing vertical input
selector s w i t c h (AC-GND-DC) into GND.
MAINTENANCE AND A D J U S T M E N T
MAINTENANCE
ADJUSTMENT
Removal of case
Before making adjustments, the following points must be
1. Lift the handle the upright position.
2. Remove the four s c r e w s holding the case at the rear using a Philips type screwdriver.
observed:
3 . Push the rear panel and the unit c a n be removed from
the case.
1 . The adjustment items outlined below have been factory
aligned prior to
shipment.
If readjustments become
necessary, make certain that the power supply voltage
is properly calibrated (except for adjustment of probe).
2 . Adjustments can be made by the semi-fixed resistors
Caution
and
High voltage of up to 2 0 0 0 V is present at the C R T
Use
a
well
insulated
flat
blade
socket, power supply circuit board and F O C U S control.
3 . High voltage (about 2 0 0 0 V ) is present on the POWER
T o prevent electrical shock, be sure to turn off the
S U P P L Y circuit. Be sure to turn off the power before
power w h e n removing the case. Special care should be
used not to touch the high voltage circuits after the case
has been removed.
removing the circuit boards.
4 . T o insure optimum results, w a r m up the unit for more
than about 3 0 minutes before making adjustments.
Voltage Conversion
DC BAL Adjustment
(1) T h e unit is factory adjusted to operate on 2 4 0 V A C .
1 . DC B A L (1) adjustment
When the unit is to be operated from 1 0 0 V , 1 2 0 V or
If the trace moves up or down at particular ranges when
2 2 0 V , be sure to change the connection of
the vertical attenuator ( V O L T S / D I V ) is turned, perform
the
voltage selector plug at the rear panel observing the ar-
the following adjustment.
row mark provided on the plug. For operation on 1 0 0
(1) S e t the D I S P L A Y MODE to R E A L and the input
or 1 2 0 V , replace the fuse with one of 1.5 A rating.
selector s w i t c h ( A C - G N D - D C ) ' t o G N D , then set the
For operation on 1 2 0 V , plug the voltage selector to
trace in the center of the scale.
1 1 7 V position.
(2)
trimmers.
screwdriver.
Fuse is fitted in the fuse holder at the rear panel.
(2) Turn
the
vertical
attenuator
VARIABLE
fully
counterclockwise and adjust the S T E P B A L V R so
that the trace is stationary at all ranges when the
V O L T S / D I V is turned.
20
MAINTENANCE AND A D J U S T M E N T
Vertical Attenuator Adjustment (VOLTS/DIV)
2 . DC B A L (2) adjustment
If the trace moves up or down at particular ranges when
the vertical attenuator V A R I A B L E is turned, perform the
(1) Using
a
square
wave
generator,
apply
1kHz
0 . 5 - 1 OOVp-p signal to the vertical input terminal.
" (2) Set the V O L T S / D I V to 0 . 1 V and adjust the trimmer
following adjustment.
(1) With the V A R I A B L E turned fully counterclockwise,
set the trace in the center of the scale. Next, turn
the V A R I A B L E fully clockwise. If, at this time, the
trace moves up or down, adjust the V A R B A L V R
T C 2 0 2 until high quality of square w a v e is obtained.
(3) Similarly, adjust the T C 2 0 4 for the 1 V range and
the T C 2 0 6 for the 1 0 V range.
until it is centered.
(2)
Repeat the above steps so that the trace stays still
when the V A R I A B L E is turned.
VAR.BAL i
STEP BAL
•
ASTIG
Fig. 2 3 D C B A L adjutment
Fig. 2 4
21
OPTION
COMBINATION M S - 1 6 5 0 B T O MU-1651 WITH JOINER (CZ-84)
Joiner
CZ-84
MS-1650B
MU-1651
Fig. 2 5
MS-1650B
MU-1651
Fig. 2 6
INSTALLATION OF A C C E S S O R Y B A G (MC-78)
1 . T h e unit can be installed accessory bag ( M C - 7 8 ,
option). Detach the hock and separate the accessory
bag and retainer plate.
2 . When viewed from the front, align the four case right
side holes with those of retainer plate and fix the retainer plate w i t h 4 nylon rivets and 4 w a s h e r s .
A t this time, confirm that the retainer plate is installed
grommet and insert the plunger.
3 . Cannot remove the case while installing the accessory
bag. W h e n removing the case, be sure to remove the accessory bag.
Retainer plate
Washer
Grommet
Plunger
Fig. 2 7
22
Nylon rivet
A product
T R I O - K E N W O O D
of
C O R P O R A T I O N
17-5, 2-chome,,- Shibuya, Shibuya-ku, Tokyo 150, Japan
©
3 5 4 0 9 P r i n t e d in J a p a n B 5 0 - 2 9 7 9 - 0 0 ( T )
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