TEK
OPERATOR'S MANUAL
070-6738-00
CFG250
-
-
-
-
-
-
-
FUNCTION
GENERATOR
-
-
-
-
-
-
-
--'
't
COMMITTED
TO EXCELLENCE
TEK
070-6738-00
PRODUCT GROUP 46
CFG250
FUNCTION
OPERATOR'S
GENERATOR
MANUAL
-
-
First Printing November 1987
Please Check for
CHANGE
at the RearofThis Manual
INFORMATION
COMMITTEDTOEXCElLENCE
Copyright © 1987 Tektronix, Inc. All rights reserved. Contents
of this publication
the written permission
may
not
be
reproduced
of
Tektronix, Inc.
in any
form
without
Products
U.S. and foreign patents issued and pending.
TEKTRONIX, TEK, SCOPE-MOBILE,
trademarksofTektronix, Inc.
Printed
are reserved.
of
Tektronix, Inc. and its subsidiaries are
a~d
i!
in
Hong Kong. Specification and price change privileges
covered
are registered
INSTRUMENT SERIAL NUMBERS
Each
instrument
stamped
the
ber
ment.
digits. The
on the chassis. The first
countryofmanufacture.
are assigned sequentially and are unique to each instru-
Those
BOOOOOO
has a serial
manufacturedinthe United States have six unique
countryofmanufacture
Tektronix,
number
The last five digitsofthe serial
Inc.,
Beaverton, Oregon,
on a panel insert, tag,
numberorletter designates
is identified as follows:
U.S.A.
by
or
num-
HK00001 Hong Kong
100000 Tektronix Guernsey,
200000 Tektronix United Kingdom,
300000 Sony/Tektronix, Japan
700000 Tektronix Holland, NV, Heerenveen,
The Netherlands
Ltd.,
Channel Islands
Ltd.,
London
Certificateofthe Manufacturer/Importer
We
hereby certify that the
AND
complies with the
Amtsbl.-Vfg 1046/1984.
The German Postal Service was notified that the equipment is being
marketed.
RF
CFG250
ALL
INSTALLED
Interference Suppression requirements
FUNCTION
OPTIONS
GENERATOR
of
-
The German Postal Service has the right
verify that it complies.
TEKTRONIX
to
re-test the series and to
Bescheinigung des Herstellers/lmporteurs
Hiermit wird bescheinigt, daB der/die/das
GENERATOR
in
Ubereinstimmung mit den Bestimmungen der Amtsblatt-Verfugung
AND
ALL
CFG250
INSTALLED
FUNCTION
OPTIONS
1046/1984 funkentstort ist.
Der Deutschen Bundespost wurde das Inverkehrbringen dieses Gerates
angezeigt und die Berechtigung zur
der Bestimmungen eingeraumt.
TEKTRONIX
UberprufUng der Serie auf Einhalten
NOTICE to the user/operator:
by
The German Postal Service requires that Systems assembled
operator/user of this instrument must also comply with Postal
Regulation, Vfg. 1046/1984,
Par.2,Sect.
1.
the
HINWEIS
Die
Gerat eingesetzt wird, muB ebenfalls den Voraussetzungen nach Par.
Zift. 1 der Vfg. 1046/1984 genugen.
NOTICE to the user/operator:
The
test setup, may only
Regulation, Vfg. 1046/1984,
HINWEIS
Dies
Voraussetzungen des
werden.
fUr
den Benutzer/Betreiber:
vom Betreiber zusammengestellte Anlage, innerhalb derer dies
German Postal Service requires that this equipment, when usedina
be
operated if the requirements of Postal
Par.2,Sect.
fUr
den Benutzer/Betreiber:
Gerat dartinMeBaufbauten nur betrieben werden, wenn die
Par.2,Zift.
1.7.1
1.7.1
are complied with.
der Vfg. 1046/1984 eingehalten
2,
CONTENTS
Page
List of Illustrations
List of Tables
The CFG250 2 MHz Function Generator,
a brief description
SECTION
1.O-Operator' s Safety Summary 1-1
1.1-Line
1.2-Grounding the Equipment
1.3-Fuses
SECTION
2.00-Front
2.05-Controls,
2.10-Rear
2.
2.20-Functions
2.21-Sine
2.22-Square
2.23-Sawtooth
2.24-
2.25-Sweep
2.26-Voltage
1-PREPARATION
Voltage Selection
2-0PERATION
Panel Organization 2-1
Panel Organization
11-Controls
Wave
TTL
FOR USE
Connectors, and Indicators
Connectors, and Indicators
and Applications
Wave
Wave
Output
Controlled External Sweep Input
1-4
1-4
. . . . . . . . ...1-4
2-2
2-4
2-5
2-6
2-6
2-7
2-8
2-9
2-9
2-9
ii
ii
iii
SECTION 3-SPECIFICATIONS
-
3.1-General Characteristics 3-1
3.2-Electrical
CFG250
Characteristics
Operator's
3-3
Page
SECTION
SECTION
SECTION
LIST OF ILLUSTRATIONS
Figure
Figure
Figure
Figure
LIST OF TABLES
Table
4-0PERATOR
5-BASIC
6-GLOSSARY
2-1.
Front Panel 2-1
2-2.
Rear Panel
2-3.
Output Test Configuration
5-1.
Circuit Block Diagram 5-1
2-1.
Waveform
THEORY OF OPERATION
chart
and invert controls
MAINTENANCE
OF
TERMS
for
symmetry
2-4
2-7
2-3
ii
CFG250
Operator's
THE
CFG250
GENERATOR
2
MHz
FUNCTION
The TEKTRONIX CFG250 2 MHz
duces sine, square and sawtooth waves and
plications include testing and calibration of audio, ultrasonic, and
servo systems. The CFG250's sweep function can be internally
or
controlled
offset, sweep rate, sweep width and amplitude are controlled by
the operator. The CFG250 has an output
0.2
Hzto2 MHz.
The TEKTRONIX CFG250 has a locking, multi-position handle
that folds under
struments
power
Should you need
Function Generator
nearest Tektronix Sales Office
Tektronix
National Marketing Center.
controlled with an external
the
instrumenttoallow stacking with other in-
of
the
same
series. The instrument is delivered with a
cord
and an
product
Operator's
more
information about your CFG250 2 MHz
or
other Tektronix products:
catalog,
FUNCTION
manual.
or
orinthe
GENERATOR
TTL
signals. Its ap-
DC
level. Duty cycle,
frequency
contact
Distributor, consult the
U.S.,
call the Tektronix
pro-
DC
range of
the
CFG250
Operator's
iii
SECTION
1
PREPARATION
FOR USE
CFG250
Operator'S
Preparation for
Use
OPERATOR'S
The
general safety information in this
and
both operating
tions wili be found throughout the
do not appear in this summary.
Terms UsedInThis Manual
CAUTION
result in
WARNING
result in personal injury
Terms
CAUTION indicates a personal injury hazard that is not immedi-
ately accessible as one reads the markings.
erty. including
statements
damagetothe
statements
As
Marked
service personnel. Specific warnings and cau-
on
the
equipment
SAFETY
manual
identify conditionsorpractices that could
equipmentorother property.
identify conditionsorpractices that could
or
loss of life.
Equipment
itself.
SUMMARY
partofthe
summary
where they apply
or
a hazardtoprop-
is for
and
DANGER
ble as one reads the marking.
Symbols
CFG250
indicates a personal injury hazard immediately accessi-
In
This Manual
This symbol indicates where applicable cautionary
other
information istobe found.
Operator's
or
1-1
Preparation for Use
Symbols
~
As
Marked
DANGER
on
Equipment
- High Voltage
@ Protective ground (earth) terminal.
A ATTENTION - Refer
rh
Power Source
This
does not apply
ductors
tective ground connection
the power cord is essential
Grounding the Product
This
power
a properly wired
input
of the grounding
safe operation.
Chassis ground.
product
product
cord.
or
is intendedtooperate
more
than 250 volts
or
between either supply
is grounded through the grounding
To avoid electrical shock, plug the power cord into
receptacle
output terminals. A protective ground connection by way
conductorinthe power
to
Manual.
from
rms
between the supply con-
conductor
by
wayofthe grounding
for
safe operation.
before
connectingtothe product
a power source that
and ground. A pro-
conductor
conductor
cord
is essential for
of the
in
Danger Arising From
Upon loss of the
conductive parts (including knobs and controls that
to be insulating) can render an electric shock.
1-2
Loss
of Ground
protective-ground
connection, all accessible
CFG250
may
Operator's
appear
Use
the
Proper
Preparation for Use
Power Cord
Use only the power cord and connector specified
for
your prod-
uct.
Use only a power cord that isingood condition.
For detailed information on power cords and connectors see
Figure
Use
To avoid fire hazard, use only a fuse of the
and current rating as specifiedinthe parts list
Do
To
2-2.
the
Proper
Not Operate in Explosive
Fuse
Atmospheres
correct
for
voltage rating
your product.
avoid explosion, do not operate this productinan
explosive
atmosphere.
Do
Not
Remove
To
avoid personal injury, do not remove the product covers
panels.
Do
CoversorPanels
not operate the product without the covers and pan-
els properly installed.
or
CFG250
Operator's
1-3
Preparation for Use
1.1-Line
This product is intended
does not supply
ductors
USA
Figure
Voltage Selection
to
operate
more
than 250 V rms between the supply con-
or
between either supply conductor and ground. Normal
from
a power source that
voltage is 120 V AC. For line voltage selection setting, see
2-2.
1.2-Grounding the Equipment
in
A protective ground connection, the third wire
is necessary
for
safe operation. To avoid electrical shock, plug
the power cord,
the power cord into a properly wired receptacle before making
any connections to the equipment inputoroutput terminals.
Do
not remove the ground lug from the power cord for any reason.
Use only the power cord and connector specified for this equipment.
1.3-Fuses
To
avoid fire hazard, use only a fuseofthe specified type, volt-
age rating and current rating
for
this equipment. (See 2.11 Con-
trols. Connectors. and Indicators.)
1-4
CFC250
Operator's
SECTION
2
OPERATION
--~
~---
CFG250
Operator'S
<D
::J
Q)
6·
o
b
i
I
N
o
j
o
"
...
o
-
"'IJ
j
CD
Q)
j
...
Q)
o
co
~.
-
o·
j
"v
'V'.
I I I
ru
l~FUNCTlON----,
1=
10
100
T=r=1
10K
lOOK
1M
I 1
SWEEP
INVERT
OUT
VOLTS
--
13
t
6738·01
IlioN
I
...
~
j
c:
CD,
!!
G)
'"
()
"
01
0
<ll
0-
0
-:
'"
III
..,
"0
CO
N
...
"
0
.
-
"'IJ
j
CD
Q)
I
......
I\)
Operation
2.0S-Controls, Connectors, and Indicators
(1)
POWER
turns the generator off.
(2)
POWER
(3)
FUNCTION
determine
connector.
(4)
RANGE
quency
(5)
FREQUENCY
frequency
the range set by the
(6) AMPLITUDE control - This variable control, depending on
the position
of the signal at the
button - Pushinto
on light - Indicates a power on condition.
buttons - The sine, squareorsawtooth buttons
the
type of signal provided at the
(Hz) buttons - These buttons determine the frerange of the signal at the
control - This variable control determines the
of the signal at the
of
the VOLTS
turn CFG250 on. A second push
MAIN
output connector.
MAIN
RANGE
MAIN
output
buttons.
OUT
button, determines the level
output
connector.
connector
MAIN
output
within
(7) VOLTS
range of
n load. Set
range of
to
INVERT
(8)
the MAIN output
control is being used, the invert switch determines which
half
shows that relationship.
DUTY
(9)
mum
symmetrical. Turning the control
of
The period of the unaffected half of the
be
buttons. When the control is pushed in, the signal outputs
are symmetrical at all control settings.
2-2
OUT
range button - Push in for
a
to2Vp-p,
to
a
to20Vp-p,
a 50 n load.
button - Pushing this button in causes the signal at
of
the output
control - Pull this control outtoactivate. At maxi-
ccw
the output signal, including TTL, will be
half
the
waveform
determined
open circuit,
the out position
in an open circuit,
connectortobe inverted. When the
waveform
as determined by the
by
the
FREQUENCY
foranAMPLITUDE
will be affected. Table 2-1
AMPLITUDE
orato1Vp-p
orato10Vp-p
cw
will change the period
INVERT
waveform
multiplier and
CFG250
control
into a 50
control
DUTY
button.
will still
RANGE
Operator's
---------
----------------_._---~
Operation
Table 2-1
chart
invert
eeN
Invert
for
symmetry
controls
In
Invert
LI
and
DUTY
Out
Square
Waveform
DUTY
Invert
Out
ru ru
-
Triangle
Sine
TTL
(10)
DC
SET
the MAIN output. When the control is pressed
is centered at zero Vdc.
(11)
SWEEP
activates
the button is
EXTERNAL
(12)
SWEEP
sweep generator and the repetition rate of the burst gate.
IV
tV
JLf
OFFSET - Pull this control outtoactivate. The
control sets the
button - Push in
the
sweep rate and sweep width controls. When
set
SWEEP
RATE
- This control adjusts the rate of the internal
out
IV
tV
JLf
DC
level and polarity of the signal at
for
the
CFG250 will
input
connector
I---.
tV
r-L-
internal sweep. This button
accept
on the rear panel.
signals
eN
Invert
r-L-
~
tV
LI
DC
in
the signal
from
In
6738-03
OFF-
its
(13)
SWEEP
sweep.
(14)
MAIN
wave, square wave and sawtooth wave signals.
WIDTH
output
- This control adjusts the amplitude of the
connector-BNC
output
connector
~
The
outside (ground)ofthe MAIN and SYNC output connectors are connected through the equipment
power source ground. Check the grounding system
receiving equipment before connecting the CFG250.
(15) SYNC (TTL) output
TTL
signals.
CFG250
Operator's
connector-BNC
output
for
to
the
of
the
connector
sine
for
2-3
:::l
-
~
O·
(l)
~
I
N
....
o
:D
CD
"
.,
III
CD
::J
III
:J
N"
.,
o
III
10
::J
III
-
o·
VA
60Hl
WATTS
20
~O
16
RATING
250V
FUSE
120V
100V2ASlOW
:_:~;~~~
®
TO
BE
CORO
MUST
SERVICING
POWER
THE
REFER
CONDUCTOR
SHOCK.
COVERS
GROUND
CAUTION
GROUNDING
TO
ELECTRIC
REMOVE
NOT
AVOIO
PROTECTIVE
TO
CONNECTED
00
VOLTAGE
SELECT
LINE
® ®
@
100V
~
,.-120V-,
@
~
<:----7
US,A
OR,
R.DC
BEAVERTON
..
INC
PERSONNEL
QUALIFIED
@
tH~
TAIWAN
IN
MADE
TEKTRONIX
§
~n~~
~40~
6738-02
VCF
(~
!Co
NIN
.,
CD
c
CD
:D
:J
"
.,
CD
III
III
I\:>
""T1
G)
()
CD
01
Cl
0'
o
..,
iil
"'0
'"
"'T1
I\)
1
2.11-Controls, Connectors, Indicators
Operation
-
(1R)LINE
(2R)
(3R)
FUSE
- Provides protection
or
overload. (MOL
range
range) .
POWER
coded.
EXTERNAL
for
nector
button is settothe out position. An inputof0
sweeps the signal at the
(100:1
base
or
MOL
INPUT
SWEEP
voltage-controlled
will control the output
).
The total sweep range is also dependent on the
frequency
0.2
A, 250V
0.1 A, 250 V
- Input
connector
input
connector
sweep. Signals appliedtothis
and the desired sweep direction.
for
equipment malfunction
slow-blow
slow-blow
for
- Input
frequency
MAIN
output down two decades
for
for
power
BNC
when
cord
~
The
outside (ground)
connector is connected through the equipment to the
power source ground. Check the grounding system
input equipment before connecting the CFG250.
of
the EXTERNAL SWEEP input
100-120
220-240
- safety
connector
the
SWEEP
to+1OV
of
the
V
V
con-
DC
(4R)
LINE
VOLTAGE SELECTOR - These selectors
for
internal wiring
various line voltages.
~
Observe and set LINE VOLTAGE SELECTORs for the cor-
rect voltage level before operating the equipment.
CFG250 Operator's
connect
the
2-5
Operation
2.20-Functions and Applications
2.21-Sine
A sine wave output is obtained
when the sine wave
the frequency
wave is set
variable
an
oscilloscope such as the Tektronix 2225orequivalent. Pro-
Wave
RANGE
by
the combination of the
FREQUENCY
from
the
MAIN
output connector
FUNCTION
button is pushedinand one of
buttons is pushed in. The frequency of the
RANGE
button and the
control. The output may be checked with
ceed as follows:
1. To operate CFG250
for
sine wave output, the controls
should be set as follows:
CONTROL
POWER
RANGE
FREQUENCY
DUTY
DC
AMPLITUDE
INVERT
VOLTS
FUNCTION
SWEEP
LINE
button
(Hz) button
Dial
control
OFFSET
control
control
button
OUT
button
button
button
VOLTAGE SELECTORs
SETTING
On
(pressed in)
1
KHz
button pressed
1.0
Inorfully
ccw
Inorcentered
Centered
Out
Out
(0-20
position)
Sine wave button pressed
Out
Check power outlet
power line range (90-132
198-250).
in
in
for
or
The cable connection is showninFigure
2. Set the oscilloscope VOLTS/DIV to 2
0.2
ms
and the restofthe controls to normal operating
2-3.
V,
the SEC/DIV to
position.
3. The output frequency can be calculated by taking the
reciprocalofthe waveform period.
4. The output can be set precisely with the Tektronix CFC250
Frequency Counter
2-6
by
connecting the output of the
CFG250
Operator's
Operation
CFG250 directly to the counter,orby using a
nector
scope
CFC250
FREQUENCY
COUNTER
at the output of the generator and connecting to the
and counter at the
same
time.
BNC
T con-
CFG250
FUNCTION
GENERATOR
DO
6738-04
Figure
When you are familiar with the setup
ample frequency, change the frequency range and rotate the
frequency dial, observing the
the voltage output of the generatorbyconnecting the Tektronix
CDM250 multimeter set on AC Volts function. Refer to the
CDM250
Operator's
read the rms valueofthe sine wave and
sine wave value you observed on the scope. The rms value
should read 0.3535 times the
signals are usedtocheck
2-3.
Manual
Output
Test
Configuration.
for
a sine wave at the ex-
scopeorcounter display. Read
for
instructions. You will be able to
compare
p-p
value on the scope. Sine wave
it to the
audio and radio frequency circuits.
p-p
The CFG250
carrier signal
series with the
nals may be injected into
2.22-Square
A square-wave output is available at the
when the square wave
high-end
for
the
centerofthe
Wave
frequencies may be used to simulate the
AM
broadcast band. With a capacitor
MAIN
output connector, audio sig-
most
audio equipment.
MAIN
output connector
FUNCTION
button and one of the
RANGE
(Hz) buttons are pushed in. The frequency of the wave is set by
the combination of the
variable
CFG250
FREQUENCY
Operator's
RANGE
control.
(Hz) button pushedinand the
2-7
in
Operation
The output
may
be checked with
an
oscilloscope such as the
Tektronix 2225orequivalent. The cable connection is shown
Figure
2-3.
The output frequency can be calculated by taking
the reciprocalofthe waveform period. The output can be precisely set with the Tektronix CFC250 Frequency Counter by con-
necting the output of the CFG250 directly to the counter, or by
using a
necting to the
To
should be set the
except the square wave
You will not be abletogetanaccurate rms reading
BNC
T connector at the output of the generator and con-
scope
set the instrument
sameasfor
and counter at the same time.
for
square wave operation, the controls
obtaining the sine wave output,
FUNCTION
button must be pushed in.
for
a square
wave on the Tektronix CDM250,ormost other digitaloranalog
meters, because they are calibrated
for
sine wave rms value.
The square wave output may be used to simulate pulse signals.
The square wave is often used to test and calibrate timing circuits.
2.23-Sawtooth Wave
A sawtooth (triangle) wave output is available at the
nector
frequency
the wave is set
when the sawtooth wave
RANGE
(Hz) buttons are pressed in. The frequency of
by
the combination of the
FUNCTION
button and one of the
RANGE
MAIN
con-
(Hz) button
pushedinand the variable frequency control.
in
The output
may
be checked with
an
oscilloscope such as the
Tektronix 2205orequivalent. The cable connection is shown
Figure
2-3.
The output frequency can be calculated
by
taking
the reciprocal of the waveform period. The output can be precisely set with the Tektronix CFC250 Frequency Counter by connecting the outputofthe CFG250 directly to the counter,orby
using a
BNCTconnector
at the output of the generator and con-
nectingtothe scope and counter at the same time.
To
set the instrument
should be set the
except the sawtooth wave
2-8
for
sawtooth wave operation, the controls
sameasfor
FUNCTION
obtaining the sine wave output,
button must be pushed in.
CFG250
Operator's
in
Operation
You
will not be able to get an accurate rms reading for the saw-
or
tooth wave on the Tektronix CDM250,
most other digital
or
analog meters, because they are calibrated for sine wave rms
value.
One
of
the most common uses for the sawtooth wave is for
an
external sweep control for an oscilloscope. It is also used to calibrate the symmetry circuits of some equipment.
2.
24-TTL
A Transistor-Transistor-Logic (TIL) signal is available from the
SYNC
connector. The pulse rate is controlled by the
buttons and the
may be controlled with the
form
FREQUENCY
dial. The symmetry of this wave
DUTY
control. The
also available in the sweep mode. The amplitude of the
Vp-p
nal is fixed at 2
The
TIL
pulse is used to inject signals into logic circuits for test-
(square wave).
RANGE
TIL
signal is
TIL
(Hz)
sig-
ing purposes.
2.25-Sweep
All
of the outputs from the function generator may be usedinthe
sweep
r;node.
output
These outputs are usedinconjunction with other
test equipment to produce a frequency modulated signal. Using
a sweep signal is a common method of tuning circuits and
checking the bandwidth of audio and radio frequency circuits.
2.26-Voltage Controlled External Sweep Input
This
feature allows the sweep generator to be controlled by
an
external voltage source. When this mode isinoperation the
SWEEP
trols are inoperative. The
mines the sweep characteristics of the signal at the
SYNC
CFG250
button is out, the
(TIL) connectors.
Operator's
SWEEP
dc
RATE
and
SWEEP
WIDTH
voltage applied to the input deter-
MAIN
con-
or
2-9
SECTION
3
SPECIFICATIONS
CFG250
Operator's
3.1-General Characteristics
OPERATIONAL
Specifications
Characteristics after 1 hr. warmup time at 23°C ±5°C,
Output
Square wave, si':le wave. sawtooth
wave,
TIL
pulse. and sweep func-
tions for all outputs.
Frequency Ranges
Range Setting Variable
1 0.2 to 2.0
10 2to20
100 20to200
Frequency Multiplier
1K
1
OK
1
OOK
1M
Variable 0.2to2.0 times the selected
0.2 kto2.0
2 k to 20
20
kHz
0.2 M to 2.0
frequency Range.
Frequency Accuracy
SWEEP
±5%
of full scale.
70%
to 200
RH.
Hz
Hz
Hz
kHz
kHz
kHz
MHz
Internal
Sweep Rate
Sweep Width
Sine Wave Distortion
CFG250
Operator's
Linear.
0.5
Hz
(2
sec period)to50
Hz
(20
millisecond period) • continuously
variable.
Variable from 1:1 to 100:1.
<
1%
from 10
Hz
to 100
KHz.
3-1
Specifications
Sawtooth Linearity
Square Response
TTL
Output
Rise/Fall
Main Output Amplitude
Impedance
DC
Duty Cycle
Time
Offset
20
Hzto200 kHz
200 kHz to 2 MHz
<100
ns rise/fall
>99%.
>97%.
time
maximum out-
put into 50 0 load.
<
25
ns (20 TTL loads).
Two ranges: 100
(open
(50 o
(open
circuit)/and
load)
circuit~
mV
to
50
mV_to~1
and 10
mV-fo2\/p-p
and 5 mV to 1
20
0
Vp-p
yp-p
Vp-p
(50 0 load).
500
±10%.
<
-10
V to > +10V (open circuit) and
<
-5Vto
> +5 V (into 50 0 load).
5 to 1 minimum duty cycle change
(50% at max CCWorCal Position).
.
-------
Input
Input Impedance
Voltage Controlled
Sweep Range
PHYSICAL
Width
Height
Depth
Weight
3-2
--
Voltage control
10 kO ±10%.
100:1 minimum
input.
240
mm
(9.46 in).
64
mm
(2.53 in).
190
mm
(7.49 in).
1.7
kg
(3.7Ib).
for
sweep frequency.
for
0 to +10
CFG250
Operator's
VDC
ENVIRONMENTAL
Specifications
Storage Temperature
Operating
3.2-Electrical Characteristics
Line Voltage Range
Power Consumption
Temp.
-10°C
10°Cto40°C, 75%
90to110,108
and 216
20
to 60°C, 80%
to
VA
• 16 W.
RH.
to
132,198
250 Vae at
RH.
50-60
to 242.
Hz.
-
-
CFG250
Operator's
3-3
SECTION
4
OPERATOR
MAINTENANCE
-
-----
CFG250
Operator's
Operator Maintenance
Electronic maintenance on the
formed by a trained technician. However, any operator can perform
some
basic and routine maintenance. The CFG250 will give
some indicationsofproblems to aid the operator.
INDICATION:
SOLUTION:
Unplug power cord and disconnect signal input or output
cables from circuits under test before checking
placing fuse.
INDICATION:
SOLUTION:
INDICATION:
SOLUTION:
Power light not on,
ment
plugged into outlet.
Check Line Fuse.
Fuse ok.
Check power outlet
Voltage ok.
Check power cord continuity.
TEKTRONIX
POWER
for
CFG250 must be per-
button in, equip-
proper voltage.
-
or
re-
-
Be
sure power cord is disconnected from power source
and equipment.
INDICATION:
SOLUTION:
CFG250
Operator's
POWER
tor.
Check that
are set correctly.
-Check
light on, no output from
RANGE
connecting cable
MAIN
connec-
(Hz) and function buttons
for
continuity.
4-1
Operator Maintenance
Disconnect test cable from circuit being tested before
checking continuity.
INDICATION:
SOLUTION:
Distorted output at MAINorSYNC
DC
Set DUTY,
SWEEP
WIDTH
OFFSET,
controlstooff position.
SWEEP
Connector.
RATE
and
4-2
CFG250
Operator's
SECTION
5
BASIC THEORY
OF OPERATION
-
-
CFG250
Operator'S
--------------'--'--''--''-----'-
Basic TheoryofOperation
The Tektronix CFG250 2
voltage controlled oscillator (VCO) made up of integrated circuits U1, U2, U3,U4and U5; and transistors
08.
The output from the
combination of charge and discharge current through03and
as determined by one of the range capacitors.
This current is applied to U6,
TIL
output and a square wave output. The triangle (sawtooth)
is
wave
produce a sinusoidal output. The triangle, square, and sine wave
signals are then applied to a power amplifier for output
also appliedtosine wave converter U7, and is shaped to
SWEEP
Generator
VCO
Sine
Gen
MHz
Function Generator consists of a
03, 04,
VCO
is a ramp waveform produced by a
06
and
07to-produce a buffered
Squarer
IC
Wave
"--~500
~
05,
to
07
and
04
a load.
TTL
6738-05
-
CFG250
Figure
Operator's
5-1.
Circuit
Block
Diagram.
5-1
SECTION
6
GLOSSARY
OF TERMS
-
-
CFG250
Operator'S
GlossaryofTerms
Alternation: A complete reversalofdirection, such as a change
from a positive direction
to
negative and back again.
Ampere (A):
Anode: The diode terminal that responds to a relatively positive
applied voltage by conducting.
Attenuator: A device
level of a signal.
Audio: Generally the frequency range of
may extend lower
Calibrate: To adjust a measuring instrument so that it will meas-
ure accurately on a particular scale
for
Cathode: The diode terminal that responds to a relatively nega-
tive applied voltage by conducting.
Cathode-ray tube (crt): The picture tube in
Clock-wise (cw): Rotate to the right.
Counter-clock-wise (ccw): Rotate
Current (I): The motion of charges
through a conductor.
. The basic unit of current.
or
circuit that lowers the voltageorpower
or
higher.
an
accurate output.
20
Hzto20
oranoutput instrument
an
oscilloscope.
to
the left.
in
one general direction
kHz, but
Cycle (Hz): One complete alternation of direction,
nating current.
an
Deflection: The amount of movement of
such as a meter needle
change in voltage, current or resistance.
Diode: A two-electrode semiconductor device that uses the rec-
tifying property of a
Farad (F): The basic unit of capacitance.
-
CFG250
Operator's
p-n
or
scope trace, due to some
junction.
indicating device,
asinalter-
6-1
GlossaryofTerms
Henry (h): The basic unit of inductance.
to
Impedance (Z): The total opposition
currentina circuit, composed of resistance and reactance (inductive and/or capacitive.
Isolation Voltage: The maximum voltage that can be applied to
two
terminals without causing a fault condition.
Kilo- (k): Prefix meaning 1000 (103).
or
Load: The impedance that a circuit,
to
output of the reference instrument.
electrical load, presents
Loading Error: The error introduced by the impedance of a
ter
when voltageorcurrent is measured.
me-
Meter Sensitivity: The reciprocal of the full-scale current of
ammeter
MegaMilliMicroOhm
(M): Prefix meaning 1,000,000
(m):
(J.l):
(0):
Pico- (p): Prefix meaning (.000000000001), (10Peak-to-peak
when it is used as a voltmeter.
(1
(6).
Prefix meaning one thousandth (.001) (10-
Prefix meaning one millionth (.000001) (10-
The basic unit of resistance.
12
).
Voltage
(Vp-p):
The voltage between the posi-
3
).
6
).
tive and negative peaks of a sine wave.
Peak Voltage (Vp): The voltage between the zero voltage refer-
ence and the peak of the sine wave shape of
an
alternating
voltage.
Polarity: The positive or negative direction of voltage or current.
Port: The signal input
or
output connectoronelectronic equip-
ment.
an
6-2
CFG250
Operator's
Power (P): The rate of using energy.
GlossaryofTerms
Resistance (R): Opposition to current, expressed
Root-mean-square
(rms): The measureofeffective value of a
in
sine wave voltage, current or power (0.707 x Value-peak).
of
Sine Wave: The graphic plot
mal ac wave form, the most
of
Volt (V): The unit
of voltage needed
through one Ohm
Watt (W): The unit
done
in
moving one Ampereofcurrent through one Ohm of
potential difference. One voltisthe amount
to
of
resistance.
of
power. One Wattisthe amountofwork
voltage against time of the nor-
common
signal form.
cause one Ampere of current to pass
resistance with an applied voltage of one Volt.
Ohms.
CFG250
operator's
6-3
MANUAL CHANGE INFORMATION
At
Tektronix, we continually strivetokeep
developments by adding Improvements
as they are developed and
tested.
'up
our
products
with the latest
as soon
to
Sometimes, duetoprinting and shipping requirements, we
get
these changes immediately Into printed manuals. Hence,
your manual
pages.
A single change
information sheets are carried
permanently entered, some duplication
change pages appear following this page, your manual
as printed.
may
contain new change information on
may
affect
several sections. Since the change
In
the
manual until all changes are
may
occur.
the
following
If no such
Is
can't
correct
-
-
Loading...