Kikusui COS5040 User manual

INSTRUCTION MANUAL
OSCILLOSCOPE
MODELS COS5040/COS 5041
KIKUSUI ELECTRONICS CORPORATION

TABLE OF CONTENTS
PAGE
1. GENERAL ....... 1
1.1 Description ....... . 1
1.2 Features . 1
2. SPECIFICATIONS ..... 3
3. PRECAUTIONS BEFORE OPERATING THE OSCILLOSCOPE .. 10
3;1 Unpacking the Oscilloscope . 10
3.2 Checking the Line Voltage . 10
3.3 Environments .. 10
3.4 CRT Intensity .. H
3.5 Withstanding Voltages of Input Terminals . 11
4. OPERATION METHOD .. 12
4.1 Explanation of Front Panel . 12
4.2 Explanation of Rear Panel . 20
4.3 Basic Operation . 25
4.4 Dual-channel Operation .. 27
4.5 ADD Operation . 28
4.6 X-Y Operation and EXT HOR Operation .. 28
4.7 Triggering . 3Q
4.8 Single-sweep Operation ........ t ,*. ■ «.... 35
4.9. Sweep Magnification .. 36
4.10 Waveform Magnification with Delayed Sweep . 37
(COS5041 only)
4.11‘ Calibration of Probe .. 41
BLOCK DIAGRAM

1 .
GENERAL
1.1 Description
Kikusui Model COS5040/5041 Oscilloscope is a dual-channel oscilloscope
with frequency bandwidth DC - 40' MHz (—3 dB), maximum sensitivity
1 mV/DIV, and maximum sweep time 20 nsec/DIV. Model 5041 has a sweep
magnification feature with B sweep. The oscilloscope employs a 6-inch
rectangular type cathode-ray tube with red internal graticule.
The oscilloscope is sturdy, easy to operate, and exhibits a high
operation reliability. It is incorporated with the various con¬
venient features and excellent functions, making itself an ideal
instrument for diversified types of research and development work
of electronic devices and equipment it can also be efficiently used
for production lines and for maintenance and service.
1.2 Features
(1) Compact, light, but sturdy:
The oscilloscope is made of aluminium diecast and it is compact,
light, but sturdy.
(2) Excellent operability:
Light torque types of lever switches and pushbutton switches are
used.. These and other controls are laid out in the most rational
locations taking purposes and frequencies of their uses into con¬
sideration, (.hereby attaining an excellent operability.
(3) High-brightness Domed-mesh type CRT, high post scceleration voltage.
(12 kV):
The high acceleration voltage and high beam-efficiency of CRT
ensures a- bright trace for high speed sweep observation.
- 1 -

(4) High stability with less drift:
The oscilloscope employs a newly-developed temperature compen¬
sation circuit, thereby greatly reducing drift of base lines
and DC balance distrubance caused by temperature change.
(5) A trigger level lock function which makes triggering adjust¬
ment procedure unnecessary:
A new trigger level lock circuit is incorporated. This circuit
eliminates the requirement of troublesome triggering adjustment
procedure not only for display of regular signals but also for
that of video signals and large duty cycle ratio signals.
(6) TV sync triggering:
The oscilloscope has a .sync separator circuit and triggering for
TV V signal and TV H signal can be automatically switched being
linked to the TIME/DIV switch.
(7) Linear focus:
Once the beam focus is adjusted to the optimum position, it is
automatically maintained irrespective of intensity change, even
for such waveforms with brightness variation as those displayed
in the A INTEN mode.
- 2 -

Vertical axes
Z. SPECIFICATIONS
Specification
Sensitivity
Sensitivity
accuracy
Vernier vertical
sensitivity
Frequency
bandwidth
Input impedance
Square wave
characteristics
DC balance shift
Linearity
Display modes
NORM: 5 mV - 5 V/DIV
x5 MAG: 1 mV - 1 V/DIV
NORM: ±3% or better
x 5 MAG: ±5% or better
To 1/2.5 or less of panel-
indicated value
NORM: DC - 40 MHz, within
“3 d-B
x5 MAG: DC - 20 MHz, within
-3 dB
AC coupling: Low limit
frequency 10 Hz
NORM: Approx. 8.75 nsec
x5 MAG: Approx. 17.5 nsec
1 JAQ ±2%, 25 pF ±2 pF
Overshoot: Not greater than
5%
Other distbrtions:
Not greater than 3%
(At 10 mV/DIV range)
NORM: ±0.5 DIV
x5 MAG: ±2.0 DIV
±0.1 DIV or less of ampli¬
tude change when waveform
of 2 DIV at graticule center
is moved vertically.
CHI: CHI single channel
CH2: CH2 single channel
DUAL: CHOP: 0.5 sec -
1 msec/DIV
ALT: 0.5 msec -
0.2 ysec/DIV
1-2-5 sequence,
H-0 ranges
10 to 35°C
(50 to 95°F),
1 kHz, at 4 or 5 DIV
With reference to
50 kHz, 8 DIV
Other ranges: 3%
added to the left
values.
10 to 35°C (50 to
95 °F)
I
i
I
When CHI POSITION
knob is pulled out
(CHOP ONLY position),
the two traces are
displayed in the CHOP
mode at all ranges.

Item
Specification
Remarks
ADD: CHI + CH2
algebraic addi¬
tion
Chopping.repe¬
tition frequency
Approx. 250 kHz
Input coupling
AC/GND/DC
Maximum allowable
input voltage
400 V (DC + AC peak)
AC: 1 kHz or lower
Common mode
rejection ratio
50:1 or better at 50 kHz,
sinusoidal wave
When sensitivities
of CHI and CH2 are
set equal
Isolation between
channeIs
At least 1000:1 at 50 kHz
At least 30:1 at 40 MHz
At 5 mV/DIV range
CHI signal output
Approx. 100 mV/DIV when
open; approx. 50 mV/DIV when
50-ohm termination
CH2 INV BAL
Balanced point variation,
1 DIV or less
PULL CH2 POSITION
(Reference at center
graticule)
Signal delay time Approx. 40 nsec (with delay
cable of approx. 120 nsec)
The displayed portion
preceding the trigger¬
ing point
Triggering
Item
Specification Remarks
Triggering
CHI, CH2, LINE, and EXT
source
(CHI and CH2 can be selected
only when the vertical mode
is DUAL or ADD. In other
cases, triggering source is
automatically selected by
the VERT MODE switch.)
Coupling
AC, HF REJ, TV, DC
Polarity
+ or -
- 4 -

Item
Specification
Remarks
Sensitivity
DC - 10 MHz: 0.5 DIV (0.1 V)
DC - 40 MHz: 1.5 DIV (0.2 V)
Video signal: 2.0 DIV (0.2 V)
AC coupling: Attenuate signal
components of
lower than 10 Hz
HF REJ: Attenuate signal
components of higher
than 50 kHz
The values enclosed
in the parentheses
are the input sensi¬
tivities when in the
EXT triggering mode.
Triggering modes
AUTO: Sweeps run in the free
mode when no triggering
input signal is applied.
Satisfies the sensi¬
tivity specification
for signal repetition
frequency of 50 Hz or
over.
NORM: When no triggering
"signal is applied, the
trace is in the READY
state and not displayed.
SINGL: One-shot sweep with
. triggering signal.
Can be reset to the
READY state by means
of RESET switch. The
READY lamp (LED) turns
on when in the READY
state or in the sweep
operation.
LEVEL LOCK
Satisfies the value of the
above trigger sensitivity
plus 0.5 DIV (0.05 V) for
signal of duty cycle 20:80
and repetition frequency
50 Hz - 40 MHz.
EXT triggering
signal input
EXT HOR input terminal is
used in common.
Input
impedance
1 Mft ±2%, approx. 25 pF
Maximum
allowable
input voltage
100 V (DC + AC peak)
AC frequency not
highter than 1 kHz
B triggering
signal
The A triggering signal of
main sweep is used as the
B triggering signal.
Model COS5041 only

Horizontal axis
Horizontal axis
display
A sweep (main sweep)
Sweep time
Sweep time
accuracy
Vernier sweep
time control
Holdoff time
Delay system
Sweep time
Sweep time
accuracy
Delay time
Delay time
accuracy
Delay jitter
Sweep magnification
Magnified sweep
time accuracy
Linearity
Specification
A, A INT, B, B TRIC'D
0.2 psec - 0.5 sec/DIV
To 1/2.5 or slower of panel-
indicated value
Continuously variable to 2
times or over of sweep length
(time) at 0.2 psec/DIV -
1 msec/DIV ranges
Continuous delay and triggered
delay
NORM: 0.2 psec/DIV -
0.5 msec/DIV
X10 MAG: 20 nsec/DIV -
50 psec/DIV
2 psec - 5 sec/DIV
±4% of the value read on CRT
1/10,000 or less
B sweep time x jitter width
A sweep time 10 DIV
10 times (maximum sweep
time 20 nsec/DIV)
0.1 psec/DIV - 0.5 sec/DIV
ranges: ±5%
0.2 psec/DIV - 0.5 psec/DIV
ranges: ±8%
NORM: ±3%
xlO MAG: ±5% (±8% for 0.2
psec and 0.5 psec/
DIV
COS5041 only
1-2-5 sequence,
20 ranges
10 to 35 °C
(50 tq 95°F)
I
COS5041 only.
Triggered by
A triggering
signal
10 to 30°C
(50 to 95°F)
Jitter width 0.5
DIV or less at
A: 1 msec/DIV
B: 1 psec/DIV
10 to 35°C
(50 to 95°F)
■
I

Position shift
caused by sweep
magnification
Sensitivity
Sensitivity
Frequency
bandwidth
X-Y phase
difference
EXT HOR mode
Sensitivity
Frequency
bandwidth
Phase difference
between vertical
axis
Specification
Remarks
Within 1 DIV at CRT screen
center
X-axis: CHI input signal
Y-axis: CH2 input signal
Same as CHI vertical axis
NORM: ±4%
x5 MAG: ±6%
10 to 35°C
(30 to 95°F),
1 kHz, at 4 or 5 DIV
DC - 2 MHz (-3 dB)
Not greater than 3° at
DC - 100 kHz
Trace swept by an external
horizontal signal applied
to the EXT TRIG IN terminal.
Vertical axis modes are CHI,
CH2, DUAL and ADD modes in
the. CHOP mode.
Approx. 0.1 V/DIV
DC - 2 MHz (-3 dB)
Within 3° (at DC - 100 kHz)
Sensitivity
Frequency
bandwidth
Input resistance
Allowable input
voltage
Specification
3 Vp-p
(Trace becomes brighter with
negative input.)
DC - 5 MHz'
Approx. 5 k£2
50 V (DC + AC peak)
AC frequency not
higher than 1 kHz

Calibration voltage
Waveform
Frequency
Duty ratio
Output voltage
Output resistance
Specification
Positive-going square wave
1 kHz ±20%
Within 45:55
2 Vp-p, ±2%
Approx. 2 k£2
Phosphor
Specification
6-inch rectangular type,
internal graticule
Acceleration voltage. Approx, 12 kV
Effective screen 8
x 10 DIV
Internal graticule; continu¬
ously adjustable illumination
1 DIV = 1C
(0.39 in.)
Line power requirements
Voltage: 10Q V, 115 V, 215 V, 230 V; with ±10% allowance.
Selectable by connector change
Frequency: 50 Hz or 60 Hz
Power consumption: Approx. 35 VA
Mechanical specifications
Mainframe dimensions: 280 W x 150 H x 370 D mm
(11.02 W x 5.91 H x 14.57 D in.)
Maximum dimensions: 285 W x 175 H x 440 D mm
(11.22 W x 6.89 H x 17.32 D in.)
Approx. 7.4 kg (16.3 lbs)

3.
PRECAUTIONS BEFORE OPERATING THE OSCILLOSCOPE
3.1 Unpacking the Oscilloscope
The oscilloscope is shipped from the factory after being fully
inspected and tested. Upon receipt of the instrument, immedi¬
ately unpack and inspect it for any damage which might have been
sustained when in transportation. If any sign of damage is found,
immediately notify the bearer and/or the dealer.
3.2 Checking the Line Voltage
The oscilloscope can operate on any one of the line voltages shown
in the below table, by inserting the line voltage selector plug in
the. corresponding position on the. rear panel. Before connecting
the power plug to an AC line outlet, be sure to check that the
voltage selector plug is set in the correct position corresponding
to the line voltage. Note the oscilloscope may not properly
operate or may be damaged if it is connected to a wrong voltage
r A C line.
When line, voltages are changed, replace fuses also as required.
3.3 E nvironments
The normal ambient temperature range of this instrument is 0 to
40°C (32 to 104°F).. Operation of the instrument outside of this
temperature range may cause damage to the circuits.
Do not use the instrument in a place where strong magnetic or
electric field exists. Such fields may disturb the measurement.
10

3.4 CRT Intensity
In order to prevent permanent damage to the CRT phosphor, do not
make the CRT trace excessively bright or leave the spot stationary
for an unreasonably long time.
3.5 Withstanding Voltages of Input Terminals
The withstanding voltages of the instrument input terminals and
probe input terminals are as shown in the following table. Do
not apply voltages higher than these limits.
Input terminal
Maximum
allowable input voltage
CHI, CH2, inputs
• 400 Vi
(DC + AC peak)
EXT TRIG.input
100 v
(DC + AC peak)
Probe inputs
600 V-
(DC + AC peak)
Z AXIS input
5Q V
(DC + AC peak)
Note: AC frequency not higher than 1 kHz.
11

4. OPERATION METHOD
4.1 Explanation of Front
o CRT circuits:
POWER ....
INTEN . ,..
B INTEN . ....
(C0S5041 only)
FOCUS .
ILLUM --.....
TRACE ROTATION -
Bezel ..
Filter ...........
o Vertical axis:
CHI (X) input__
Panel (See Figures 4-1 and 4-2.)
(3) Main power switch of the instrument.
When this switch is turned on, the
LED (2) above the switch is also
turned on.
©
Controls the brightness of the spot
or trace
©
Semi-fixed potentiometer for adjusting
trace intensity when in B sweep mode.
©
For focusing the trace to the sharpest
image.,
(8) Graticule illumination adjustment.
(7) Semi-fixed potentiometer for aligning
the horizontal trace in parallel with,
graticule, lines.
For installing a camera mount in
one-touch, operation.
Blue filter for ease of waveform
viewing, Can be removed in one-
touch. operation.
(11) Vertical input terminal of CHI.
During X-Y operation, this becomes
X-axis (abscissa) input terminal.
12 -

CH2 (Y) input
AC-GND-DC .. . dd)(l!
VOLTS/DIV .. @©
Vertical input terminal of CH2.
During X-Y operation, this becomes
Y-axis (ordinate) input terminal.
Switch for selecting connection
mode between input signal and
vertical amplifier.
AC: AC coupling
GND: Vertical amplifier input is
grounded and input terminals
are disconnected.
DC: DC coupling
Select the vertical axis sensitivity,
from 5 mV/DIV to 5 V/DIV with 10
ranges.
VARIABLE .. . @(17)
VOLTS/DIV
Fine adjustment of sensitivity, with
a factor' of 1/2.5 or higher of the
panel-indicated value. At the CAL'D
position, sensitivity is calibrated
to the panel-indicated value. When
this knob is pulled out (x5 MAG state),
the amplifier sensitivity is multi¬
plied by 5 times.
Vertical positioning control of trace
or spot.
VERT MODE ........ (14) Selects operation modes of CHI and
CH2 amplifiers. Also selects internal
triggering source signal.
CHI: The oscilloscope operates as a
single-channel instrument with
CHI alone. The CHI input signal
is used as the internal triggering
source signal.
13

CH2:
VERT MODE
The oscilloscope operates as a
single-channel instrument with
CH2 alone. The CH2 signal is
used as the internal triggering
source signal.
DUAL: The oscilloscope operates as a
dual-channel instrument with
both CHI and CH2. The internal
triggering source signal is
selected by SOURCE switch (26) .
ADD: The oscilloscope displays the
algebraic sum (CHI + CH2) or
difference (CHI - CH2) of the
two signals. The pulled out
state of CH2 POSITION knob (20)
provides the difference (CHI -
CH2). The internal triggering
source signal is selected by
SOURCE switch (26) .
o Triggering
EXT TRIG (EXT HOR) ..
input terminal
SOURCE .
This terminal is used in common for
external triggering signal and external
horizontal signal. To use this terminal,
set SOURCE switch (26) to the EXT posi¬
tion.
Selects the internal triggering source
signal. Also select the EXT HOR input
signal.
CHI X-Y : When the VERT mode switch
(14) is set at the DUAL or
ADD position, selects CHI
for the internal triggering
source signal. During the
X-Y mode operation, selects
CHI for the X-axis signal.
14 -

COUPLING
COUPLING
CH2: When the VERT mode switch (14)
is set at the DUAL or ADD position,
selects CH2 for the internal
triggering source signal.
EXT: The external signal applied
through EXT TRIG (EXT HOR) input
terminal (2^) is used for the
external triggering source signal.
During the X-Y, EXT HOR mode operation,
the X-axis operates with the exter¬
nal sweep signal.
Note: When the VERT MODE switch is set
to the CHI or CH2 position, inter¬
nal triggering source signal
selection cannot be made by the
SOURCE signal. In such cases, a
triggering source signal is
set by the VERT MODE switch.
Select coupling mode between triggering
source signal and trigger circuit;
select connection of TV sync trigger
circuit.
AC: AC coupling
HF REJ: AC coupling, with components
higher than 50 kHz rejected.
DC: DC coupling
TV: The trigger circuit is connected
to the TV sync separator circuit
and the sweeps are synchronized with
the TV V or TV H signal at a rate
selected by the TIME/DIV switch (30) .
15 -

TV V: 0.5 sec/DIV - 0.1 msec/DIV.
TV H: 50 ysec/DIV - 0.2 ysec/DIV.
SLOPE
SLOPE
HOLDOFF . @
LEVEL .. @
Selects the triggering slope.
: Triggering occurs when the trigger¬
ing signal crosses the triggering
level in the direction of signal
increase (i. e., positive direction)
Triggering occurs when the trigger¬
ing signal crosses the triggering
level in the direction of signal
decrease (i. e., negative direction)
M + n slope
Triggering
point
n - M slope
These double-knob controls are for
holdoff time adjustment and triggering
level adjustment.
The HOLDOFF time control is used when
the signal waveform is complex so that
stable triggering cannot be attained
with LEVEL knob (22) alone.
The LEVEL knob is for displaying a
synchronized stationary waveform and
setting a start point for the waveform.
As this knob is turned in +"
direction, the triggering level moves
upward on the displayed waveform; as
the knob is turned in " the
triggering level moves downward.
16 -

When set in the LOCK position, the
triggering level is automatically-
maintained at an optimum value
irrespective of the signal amplitude
(from very small amplitude to large
amplitude), requiring no manual
adjustment of triggering level.
o Time Base
A TIME/DIV AND
DEJAY TIME
(COS5041 only)
A TIME/DIV AND DELAY TIME
VARIABLE
Selects the sweep time for the A
sweep or the delay time when in the
delayed sweep mode. When this switch
is set to the X-Y EXT HOR position,
the oscilloscope operates as an X-Y
scope with CHI for the X-axis or
operates In the EXT HOR mode with an
external sweep input signal for the
horizontal signal,,
(For details, see Page 28 and 29.)
TIME/DIV . (30) /Selects the sweep time.
(COS5040 only)
TIME/DIV
VARIABLE ......... (31) Vernier control of sweep time (the A
PULL xlO MAG sweep for COS5041). The sweep time
can he made slower by a factor of 2.5
or more of the panel-indicated value.
17 -

The panel-indicated values are
calibrated with this knob set in
the CAL'D position.
The pulled out position of this
knob is for the xlO MAG state.
POSITION .. (3^) Vertical adjustment of the trace or
spot.
B TIME/DIV ........ (33) Selects the sweep time for delayed
(COS5041 only) sweep (B sweep).
delay tTISP^osition
DELAY TIME POSITION.. (34) Vernier control of the delay time
selected by the A TIME/DIV AND DELAY
TIME switch (30) , to finely select
;the portion of the A sweep waveform
to be magnified.
SWEEP MODE
( 28 )
28) Selects the desired sweep mode.
AUTO:
NORM:
When no triggering signal is
applied or when triggering
signal frequency is less than
50 Hz, sweep runs in the free
run mode.
When no triggering signal is
applied, sweep is in a ready
state and the trace is blanked
out. Used primarily for
observation of signals of
50 Hz or lower.
18 -