Wavetek Model 188 Function Generator Instruction Manual

MODEL 188
4 MHz SWEEP/
FUNCTION GENERATOR
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INSTRUCTION MANUAL
MODEL 188
4 MHz SWEEP/
FUNCTION GENERATOR
5) - 1980 - WAVETEK
THIS DOCUMENT CONTAINS INFORMATION PROPRIETARY TO
WAVETER AND IS SOLELY FOR INSTRUMENT OPERATION AND
MAINTENANCE. THE INFORMATION IN THIS DOCUMENT MAY
NOT BE DUPLICATED IN ANY MANNER WITHOUT THE PRIOR AP-
PROVAL IN WAITING OF WAVETEK.
SAN DIFE
50 Box 351 San Dion. can 85112 Manual Revision: 1/82
Tel 714/279-2200 TWX 910-335-2007 Instrument Release: D
WARRANTY
All Wavetek instruments are warranteed against defects in material and workmanship for a period
of one year after date of manufacture. Wavetek agrees to repair or replace any assembly Of
component (except batteries) found to be defective, under normal use, during this period.
Wavetek's obligation under this warranty is limited solely to repairing any such instrument which in
Wavetek's sole opinion proves to be defective within the scope of the warranty when returned
to the factory or to an authorized service center, Transportation to the factory or service Center
is to be prepaid by purchaser. Shipment should not be made without prior authorization by
Wave,
This warranty does not apply to any products repaired or altered by persons not authorized by
Wavetek, or not in accordance with instructions furnished by Wavetek. If the instrument 15
defective as a result of misuse, improper repair, or abnormal conditions or operations, repairs will
he billed at cost.
Wavetek assumes no responsibility for its product being used in à hazardous or dangerous manner
either alone or in conjunction with other equipment. High voltage used in some instruments may
be dangerous if misused. Special disclaimers apply to these instruments, Wavetek assumes no
liability for secondary charges or consequential damages and, in any event, Wavetek's liability tor
breach of warranty under any contract or otherwise, shall not exceed the purchase price of the
specific instrument shipped and against which a claim is made.
Anv recommendations made by Wevetek for use of its products are based upon tests believed to be
reliable, but Wavetek makes no warranty of the results to be obtained. This warranty is in lieu of
all other Warranties, expressed af implied amd no representative er person 15 wthôrired to
represent or assume for Wavetek any Мабииу и connection with the sale of our products other
than set forth herein.
SAFETY
This instrument is wired for earth grounding via the 1acilily power wirnng Do no bypass
garth grounding win two wire extension cords, plug adaplers, SiC
BEFORE PLUGGING IN the instrument, comply with installation instructions
MAINTENANCE may require power on with the instrument covers removed. This
should be done only by qualified personnel aware of the electrical hazards
The instrument power receplical is connected to the instrument satety earth term nal
with a greeniyellow wire. Do not alter this connection (Reference: (+) or {I stamped
nside the rear panel near the safety earth terminal.)
WARNING notes call attention to possible injury or death hazards in subsequent
operations
CAUTION notes call attention to possible equipment damage in subsequent operatrons
SECTION 1
SECTION 2
SECTION 3
SECTION 4
SECTION 5
SECTION 6
SECTION 7
CONTENTS
GENERAL DESCRIPTION
1.1 THE MODEL 188..............
1.2 SPECIFICATIONS
1.2.1 Versatility......
1.2.2 Frequency Precision.
1.24 Amplitude Precision.
1.2.4 Wavetorm Characteristics
1.25 General ..............
INSTALLATION
2.1 MECHANICAL INSTALLATION
2.2 ELECTRICAL INSTALLATION
2.2.1 Power Connection...
2.2.2 Signal Connections. .....
23 ELECTRICAL ACCEPTANCE CHECK.
24 CHANGING THE OUTPUT IMPEDANCE................
OPERATION
3.1 CONTROLS AND CONNECTIONS. ..........
3.2 OPERATION. .
+.2.1 Signal Termination. ление
3.2.2 Manual Function Generator Operation.
3.2.3 Voltage Controlled Function Generator Operation. as ==
3.2.4 Sweep Generator OperatlOn.......e. ec .=.=—.-..Ñacñna
3.25 Waveforms
CIRCUIT DESCRIPTION
ALIGNMENT
5.1 FACTORY REPAIR
5.2 REQUIRED TEST EQUIPMENT. .................
5.3 REMOVING GENERATOR COVERS... ......
2.4 ALIGNMENT
TROUBLESHOOTING
6.1 FACTORY REPAIR........
6.2 TROUBLESHOOTING TABLES. .
63 TROUBLESHOOTING INDIVIDUAL COMPONENTS...
6.4 GENERAL INSTRUCTIONS
PARTS AND SCHEMATICS
7.1 DRAWINGS ........ Tel clas
7.2 OHDERING PARTS. .
7.3 ADDENDA
2-1
2.1
2-1
2.1
3-1
3-2
+
3-3
3-3
4.4
3-5
5-1
5.4
5 a
5-1
6-1
6-2
7-1
7-1
7-1
НН НН и п п п НН НН в @
1.1 THE MODEL 188
The Wavetek Model 188, 4 MHz Sweep/Function
Generator, is a precision source of sine, triangle and
square wavelorms plus dc voltage. All waveforms are
front panel variable from 4 mHz 10 4 MHZ ana can be
internally or externally modulated. Frequencies are
variable linearly or logarithmically within a frequency
range. When used as a sweep generalor, an Internal
ramp genarator provides a recurring sweep over a
1000:1 (linear) frequency range or 10,000:1
(logarithmic) frequency range. Output can be con
tinuous or the generator can be triggerad or gated by
an external signal or a front panel switch. Amplitude
of the waveforms is vanable form 10v peak-to-peak in-
10 500 down 10 15 mV peak-to-peak, DC reference of
the wavelorm can be oliset positively or negatively.
The two selectable waveform outputs are a 20V peak-
to-peak maximum and a 2V peak-io-peak maximum
(20 d8 down from 20 Vp-p); both may be varied over a
30 dB range. Auxiliary outputs are a TTL level sync, a
E000 sweep ramp and a 6000 generator control
voltage signal whose level 15 proportional to the main
generator freguency.
1.2 SPECIFICATIONS
1.2.1 Versatility
Waveforms
Sine M, , triangle ™ ,square 'L , TIL pulse m
and dc.
Operational Modes
Continuous: Generator runs continuously at selected
frequency.
Triggered: Generator is quiescent until triggered by
external signal or manual trigger, then generates one
complete waveform cycle at selected frequency.
Gated: As triggered mode, except output continues
lor duration of gate signal. Last waveform started is
completed.
SECTION 1
GENERAL DESCRIPTION
Sweep: An internal ramp generator will sweep the
main generator from a lower, start frequency to a
higher stop frequency, linearly (3 decades) or
logarithmically (4 decades)
Sweep Stop: Frequency switches to high sweep limit.
Used to set high frequency limit
Frequency Range
0.004 Hz linear (0.0004 Hz log) to 4 MHZ in 7 overlap-
ping decade ranges:
x 1 0.004 (0.0004) to 4 Hz
x 10 0.04 (0.004) to 40 Hz
x 100 0.4 (0.04) to 400 Hz
Xx 1K 4 (0.4) Hz to 4 kHz
x 10K 40 (4) Hz 10 40 kHz
» 100K 400 (40) Hz to 400 kHz
x 1 4 (0.4)kHz to 4 MHz
Function Output
"e, Y. TL; selectable and variable to 20 Vp-p
(10 Vp-p into S041) HI output, and to 2 Vp-p (1 Vp-p into
50M) LO oulpul. Both outputs varied with a 30 dB ver-
nier. Peak output current is 100 mA maximum (HI out-
put) into 500 (200 MA peak into a short circuit). Source
impedance is 500
DC Offset and DC Output
Wavelorm offset and dc output selectable and variable
through HI and LO BNC outputs. DC output selectable
by not selecting a wavelorm function. HI output is
+ 10V max (+ 5V into 500) as offset or Vdc output.
signal-peak plus offset limited to + 10V (x 5V into
S00). LO output is + 1V max (+ 0.5V into 500) as is
signal-peak plus offset limit, DC ofiset plus waveform
attenuated proportionately atl LO ( = 20 dB) output.
TTL Sync Output
TTL pulse (50% duty cycle) at generator frequency.
Drives up to 20 TTL loads
GCV — Generator Control Voltage
O to 4.0Y open circuit Oulpui from 6000 source im-
pedance. Proportional to frequency of main
generator. For use as a horizontal drive signal.
1-1
и
VCG — Voltage Controlled Generator
Up to 1000:1 frequency change (linear mode) or up to
10,000:1 change (logarithmic mode) with external 0 to
+ 4Y signal. Upper and lower frequencies limited to
maximum and minimum of selected range.
Slew Rate: 2% of range per xs (linear); 0 to 100%: of
range in 20 ms (logarithmic).
Linearity: £0.5% through X 100K range; + 2% on
x 1M range.
Input Impédance: 2 КО.
Sweep
Main generator is frequency modulated by internal
sweep generator. Main generator frequency
repeatedly rises Irom frequency set by dial and range
button to frequency set by sweep stop knob.
Sweep Mode: Linear (3 decades max) or logarithmic
(4 decades max).
Sweep Rate: 30 ms to 1 min. (nominal) continuously
adjustable.
Sweep Width: Up to 1:1000 (linear) or 1:10,000
(logarithmic) continuously adjustable.
Sweep Output
Ramp waveform output with 4V peak into open circuit.
Source impedance 6000. For use as a horizontal drive
signal.
Trigger and Gate
Input; TTL compatible levels,
Pulse Widih: 50 ns minimum,
Repelilion Rate: 4 MHz maximum.
1.2.2 Frequency Frecision
Dial Accuracy
+ 5% of full scale.
Time Symmetry
Square wave variation from 0.2 to 4.0 on dial less than:
+ 1% to 100 kHz; +5% lo 4 MHz.
1-2
1.2.3 Amplitude Precision
Sine variation with frequency less than: 0.2 de on
all ranges through XX 100K; £1.0 dB to 4 MHz.
ë
1.2.4 Waveform Characteristics
Sine Distortion
Less than: 0.5% on x1K and x 10K ranges; 1% on
x 1, X10, x 100 and > 100K ranges. All harmonics
22 dB below fundamental on > 1M range.
Triangle Linearity
Greater ihan 995 to 200 kHz.
Square Wave Rise and Fall Time
At HI output, less than 50 ns for 10 Vp-p output into
S00 termination.
1.2.5 General
Environmental
specifications apply at 25°C + 5°C. Instrument will
operate from 0*C to 50°C ambient temperatures.
Dimensions
28.6 cm (11% in.) wide: 8.9 cm (314 in.) high; 26.7
(101% in.) deep
Weight
2.7 kg (6 ID) net: 4.5 kg (10 Ib) shipping.
Power |
90 to 128V or 198 to 264V (specify); 48 10 66 HZ; less
than 15 walls.
NOTE
AN specifications apply for dial between 0.2
and 4.0; amplitude at 10 Vp-p from HI out-
put into 500 termination.
2.1 MECHANICAL INSTALLATION
Alter unpacking the Instrument, visually inspact all
external parts for possible damage 10 connectors, SUr-
face areas, etc. If damage is discovered, file a claim
with the carrier who transported the unit. The shipping
container and packing material should be saved in
case resmpment 15 required,
2.2 ELECTRICAL INSTALLATION
2.2.1 Power Connection
WARNING
To preclude injury ordeath due to shock,
the third wire earth ground must be con-
tinuous to the facility power outlet.
Belore connecting to the facility power
outlet, examine axtension cords, auto-
transformers, eic., between the instru-
ment and the facility power outlet for a
continuous earth ground path. The earth
ground path can ba identified at the
plug on the instrument power cord; of
the three terminals, the earth ground
terminal ls the nonmatching shape,
usually cylindrical.
CAUTION
To prevent damage to the Instrument,
check for proper match of line and instru-
ment voltage and proper fuse type and
rating.
NOTE
Unless otherwrsa specified al the fime of
purchase, this instrument was shipped
from the factory for operation on a 20 fo
128 Vac line supply and with a 1/4 amp slow
blow fuse. Instruments configured for 180
to 256 Vac have a 1/8 amp slow Dow fuse.
SECTION 2
INSTALLATION
select the appropriate fuse and 115 or 230
swilch position al the rear panel when
changing power sources.
2.2.2 Signal Connections
Use 3 foot AGSAU 500 shielded cables equipped with
BNC connectors to distribute all input and output
signals.
2.3 ELECTRICAL ACCEPTANCE CHECK
This checkoul procedure is a general verification of
generator operation. Should a malfunction be found,
reter 10 the warranty in the front of this manual.
A two channel oscilloscope, four 3 foot 500 coax
cables with BNC connectors, a coax tee connector
and an additional function generator are required for
this procedure,
Freset the generator front panel controls as follows:
Control Position
Dial 2.0
MODE CONT (released)
FUNCTION Ly
DC OFFSET OFF (cow)
AMPLITUDE MAX (cw)
FREQUENCY MULTIPLIER x IK
SWEEF CONT (released)
Sel up the oscilloscope, Model 188 and external func-
tion generator as shown in figure 2-1 and perform the
steps in table 2-1.
24 CHANGING THE OUTPUT IMPEDANCE
The output impedance is normally:
HI 10V р-р (500 source) into S041.
LO 1V p-p (501 source) into 501.
2-1
| SYNC OUT OSCILLOSCOPE |
MODEL 188 | | |
(LOY {НП CHT CAZ
' +
| FUNCTION GENERATOR
& E de | OR VOLTAGE SOURCE
(INITIALLY CFF)
Figure 2-1. First Setup
Amplitude is normally variable over 30 dB lor each
output with a 50 dB amplilude range available by
utilizing both oulpuls
If simultaneous 6007 and 500 output impedances are
desired
1 Change value of R148 from 43907 to 80411.
2. Remove R149.
The result is:
HI 10V p-p (500 source) into SOI
LO 10V p-p (6000 source) into 6000.
Amplitude is variable over 30 dB. Square wave rise
and fall time is less than 150 ns. Any value greater
than 60007 may also be substituted for the value of
R148 for other output impedances.
To increase the range of the vanable amphiugde com
trol in a modified unit beyond 30 dB, decrease the
value of R124 as necessary. Waveform quality
relative to the standard unit is not guaranteed below
— 30 dB and above 20 KHZ.
Table 2-1. Initial Checkout
Step Control | Position/Operation Observation |
1 | POWER ON + 10V square wave on CH1 and +1V on CHZ.
| Return to CHI only.
> | Dial Rotate in both directions. Return] Rotation cow increases frequency of "Ls
to 2.0. rotation cw decreases frequency.
3 | FREQUENCY Press each switch sequentially;| Frequency increases in decade steps, left to
| MULTIPLIER return to x 1K right.
4 | AMPLITUDE Hotale Cow Amplitude decreases.
5 | DC OFFSET Rotate cw. Return to OFF | Output immediately offset negative, then moves
F | positive. OFF return it to original level.
» р i — —
6 | AMPLITUDE Hotate cw, | Square returns to orginal amplitude.
7 | Function Generator | Vary input dc voltage; then discon-| Frequency increases with positive vollage and
| or DC Voltage nect VCG IN input
decreases with negalive voltage.
| Source
8 | FUNCTION Press Ar, "Li Observe tu . 'L . “v wavelorms.
> | MODE Gale (CONT depressed, Ade level near zero volts (except 'L function).
TRIGIGATE released).
10 | MANUAL TRIGGER | Fress and hold
E Phas
2-2
| Continuous
Table 2-1. Initial Checkout (Continued)
step Control | Position/O peration | Observation
Sel up trigger source as shown in figure 2-2. Sel trigger source for 100 Hz TTL signal
14 : == я gated on during positive portion of TIL
signal ón CH?
= === = = a | — ——
12 | TRIGIGATE Trigger (depressed) | One cycle per nigger cycle
an E ep i = — паса o = a
13 | MODE | Main generator continuous Selup conneclors as shown in figure 2-3
| | (CONT released) Sync scope on channel 2 input
14 | Cial FUN CW
15 | SWEEP Linear sweep (CONT depressed, | Output varies from low frequency 10
Controls SWPISTOP depressed, LOG/ILIN high Irequency
extended, STOP full cw, TIME
centered)
16 | МОС Press Logarihmic distrhibuled sweep when compared
Button | to step 15 linear sweep
SYNC QUT OSCILLOSCOPE | OSCILLOSCOPE
MODEL 188 Ip | MODEL 188
a
co... cs a « # € # ##
TRIG] 1500 CH1 CH? Г 500 сн! сн?
IM OUT (HI) ” ? | swP OUT T +
- OUT | IHN
| В
FUNCTION
| STILOUT | GENERATOR
Figure 2-2. Second Setup Figure 2-3. Third Setup
2-3
E nnxxnnnuunuaRNzZRLLU
3.1 CONTROLS AND CONNECTIONS
The generator front panel controls and connectors are
shown in figure 3-1 and keyed to the following descrip
lions.
1 Frequency Dial — Settings under the dial index
mark summed with 21 and multiplied by à
determine the output signal frequency and the
sweep start frequency in sweep mode. The dial
is engraved with both linear and logarithmic
scales: outer scale linear and inner scale
logarithmic.
2 POWER Button — Turns genarator ON and OFF,
3 STOP Knob — Sets thé upper frequency limit
when CONT 5 is depressed and SWP/STOP 6 is
extended,
SECTION
OPERATION
FREQUENCY MULTIPLIER Controls — Selects
one of seven frequency multipliers for dial 1 set-
ling.
CONT Button — Selects sweep submode to
main genarator's continuous mode. Extended is
continuous (nonsweep) mode while depressed is
sweep mode. Sweep is from a low frequency set
by 1 Lo a high frequency sel by 3. Main generator
mode control 8 must be in continuous mode (ex-
tended).
SWPISTOP Button — When butlon is depress-
ed (and 5 depressed and 8 extended) selects
repetitive sweep of the main generator freguen-
cy. When button is extended, the frequency is
stopped al the upper sweep limit with upper fre-
quency being sel by STOP control 3.
LIN/LOG Button — Selects linear or
logarithmic frequency distribution of sweep,
6 7 8 8 111 12
— dC NEAL
; iss 44
Figure 3-1. Controls and Connectors
3-1
VCG and main dial within a frequency range.
Linear operation is selected when the button is
extended, Logarithmic operation is selected
when the button is depressed.
8, 9Generator MODE Controls — Selects one of
10
11
12
13
14
15
16
Fe
ihe following three modes.
CONT — 8 released. Continuous output af
500 OUT 15 and 16 and SYNC OUT (TTL)
17 connectors.
TRIG — 8 and 9 pressed. DC level outpul
until generator triggered by the MAN TRIG 11
or with a signal at the TRIG IN connector 18 .
When triggered, the generator output is one cycle
of wavelorm followed by a dc level.
GATE — 8 pressed and 9 released. As for
TRIG except the output is continuous for the
duration of the manual or external trigger signal.
The last cycle started is always completed.
TIME Knob — Sets the sweep time by control
ling the period of the sweep ramp generator.
Manual Trigger Button — Triggers or gates the
output signals when generator mode is TRIG or
GATE (8 pressed). In trigger mode, one
waveform cycle 15 oulpui when the button 15
pushed. In gate mode, wavelorm cycles are con-
tinuously output as long as the button is held in.
FUNCTION Selactor — Selects one of three
wavelorms or when all ihree buttons are released,
a de level.
DC OFFSET Control — Offsets the 5000 QUT
waveforms or gives de levels from = 10V to
+ 10V (= 5V 10 + 5Y into 500) at 15 and from
=1V to +1VY(-0.5Y to +0.5V into 5007) at 16.
An OFF position ensures no offset,
AMPLITUDE Control — Cow rotation reduces
waveform amplitudes al 15 and 16 by
30 dB. DC and offset voltages are not affected
by this control.
500 QUT HI Connector — The main output of
the generator at the function selected. Maximum
20 Vp-p (10 Vp-p into S041) with 30 dB conlinuous
amplitude control. 500 source impedance.
500 OUT LO Connector — Same as 15 ex-
cept 20 dB (1/110) lower in amplitude.
17 TTL OUT Connector — A TTL square for each
cycle of the generator. To be used for syn
chronization or as a TTL signal capable of driv-
ing 20 TTL loads
18 TRIG IN Connector — Accepts a TTL signal to
trigger or gate the generator. Triggers on the ris-
ing (low to high) transition and gates during the
positive (high) portion of the triggering signal.
19 SWP OUT Connector — Supplies a ramp
waveform with an approximate 4V peak into an
open circuit. For use as a horizontal drive signal.
Source impedance is 6000.
20 GCV OUT Connector — Provides a 0 lo 4V
open circuit output proportional to the frequency
of the main generator. For use as a horizontal
drive signal. Source impedance 15 6000.
21 YCGINConnectóor — Accepis acor Oc vollages
to proportionately control frequency within the
range determined by the FREQUENCY
MULTIPLIER 4 . Positive voltage increases the
frequency set by the dial 1 ; negative voltage
decreases the frequency. The YCG IN will not
drive the generator frequency beyond the nor-
mal dial limits of a range. Input impedance Es
2 КО.
3.2 OPERATION
Perform the initial checkout in Section 2 for the feel of
the instrument, Any questions concerning individual
controls and connectors may be answered in
paragraph 3.1.
3.21 Signal Termination
Froper signal termination, or loading, of the generator
conneclors is necessary for its specified operation.
For example, the proper termination of either of the
5011 QUT connectors is shown in figure 3-2. Placing
the 5011 terminator, or 508} resistance, in parallel with
a higher impedance, matches the recening INStru-
ment input impedance 10 the coax characteristic and
generator oulpul Impedance, thereby minimizing
signal reflection or power loss on the line due to Im-
pedance mismatch,
The input and output impedances of the generator
connectors are listed below.
НН НН В Ш ЕН пн в Е
Connector Impedance
500 QUT (HI) 500
S00 OUT (LO) SON
oY NC OUT (TTL) =
TRIG IN у
VCG IN 2 KT
SWF OUT 5001
GCV OUT 5000
“The TTL OUT connector is diode protected and can
drive up 10 20 Transistor-Transistor-Logic (TTL) loads
{low level Delween OV and 0.4V, and high level bet-
ween 2.4V and 5V). It should not be connected to
resistive Ildad less than 6000. The TRIG IN connector
accepts TIL logic levels, is diode protected, and re-
quires 300 uÀ drive from a high level output.
FUNCTION 12
DC OFFSET 13
Sel lo desired wavelorm,
Sel as desired, Limit wave-
RECEIVING
MODEL 188 INSTRUMENT
| ARG580R EFFECTIVE
OUTPUT EQUIVALENT | CIRCUIT
IMPEDANCE RESISTANCE
500 E
LOAD
“А т —"
< (SIGNAL
© | LOAD]
OUTPUT Ser \
AMPLIFIER Г Lo ==
Figure 3-2. Signal Termination
3.2.2 Manual Function Generator Operation
For basic operation, select the waveform frequency
and amplitude. The following steps demonstrate
manual control of the function generator. (Bold
numbers are keyed to figure 3-1.)
Step Control/Connector Setting
1 500 UT 15 18 Connect circuit to either
output (refer to para-
graph 3.2.1).
2 FREQUENCY Sel to desired range of fre-
MULTIPLIER 4 quency
3 Frequency Dial 1 Set 10 desired frequency
within the range
4 SWEEP's CONT S&S Extended.
form amplitude to prevent
clipping (see figure 3-3).
7 AMPLITUDE 14 Set for desired amplitude.
3.23 Voltage Controlled Function Generator
Operation
Operation as a voltage controlled funciion generator
(VCG) ls as lor a manually controlled function
generator, only the frequency within a particular range
15 additionally controlled by an external voltage [ + 4V
excursions) injected at the VCG IN connector. Per:
form the steps given in paragraph 3.2.2, only set the
treguency dial to determine a reference from which
the frequency is 10 be voltage controlled:
AY a aaa E e.
Vz me
= ЙА —— и и MN —
о оС
OFFSET
+ 5V = A ———— — — — —= == - —
й |
I J f
|
ГУ \/ y
E EI NS O GS E аш o = À fa и
POSITIVE NEGATIVE
OC OFFSET DC OFFSET
+ Bir [a Na pins
\ V / A
f | \ | \ |
МА
Ry A Hr но ЗЕ {KE AU: En
EXCESSIVE EXCESSIVE
POSITIVE NEGATIVE
OFFSET OR OFFSET CB
LOADING LOADHMNG
Figure 3-3. DC OFFSET Control
For frequency control with positive de inpuls a
VCG IN, set the dial for a lower frequency limit
2 For frequency control with negative de inputs at
УСК IN, set the dial for an upper Irequency limit
3 For modulation with an ac input at VCG IN. set
the dial at the desired center frequency. Do not
3-3
exceed the limits of the selected frequency
range
Figure 3-4 is a nomograph with examples of dial and
voltage effects. Example 1 shows that with OV VCG in-
put, frequency is determined by the main dial setting,
2 (linear mode) or .04 (logarithmic mode) in this exam-
ple, Example 2 shows that with a positive VCG input,
output frequency is increased. Example 3 shows that
with a negative VCG input, output frequency is
decreased. (Mole that the Output Frequency Factor
column value must be multiplied by a frequency range
multiplier to give the actual output frequency.)
MAIN DIAL VCG IN OUTPUT
SETTING VOLTAGE FREQUENCY
FACTOR
LIN LOG LOG LIN
4 4 aT: 0004 — .004
= a+ +
004
34-4 = a 1
AMP =~
= 14 as A
Ge EXAMPLE 1
2 -04---—-—-—- 04 ----—--- 044+ 20
= В 1 = —
1 4 004 2.0 ta, 4-1 30
= 30 <= de, A
004 LL moda do L i 4.0
Figure 3-4. VCG Voltage-to-Frequency Nomograph
NOTE
Nonlinear opgerahon may result when [he
VCG mpul voltage Is excessive; that is,
when the attempted generator frequency
exceeds the range limits. The upper mil is
four times the mullipher setting, ang [he
lower limit is 1/1000¢h (linear) or 1/10.000
(logarithmic) of the upper limit
3-4
The up lo 1000:1 (linear) or 10.000:1 (logarithmic) VG
sweep of the generator frequencies available in each
range results from a 4V excursion at the VCG IN con-
nectar. With the frequency dial set to 4.0, excursions
between —4Y and 0V at YCG IN provide the up to
1000:1 (lin) or 10,000:1 (log) frequency sweep. With
the dial set to .004 (linear) or .0004 (logarithmic), ax-
cursions between OV and + 4V at the VCG IN provide
up to 1000:1 (linear) or 10,000:1 (logarithmic sweep
within the set frequency range.
3.24 Sweep Generator Operation
Operation as a sweep generator is similar to manually
controlled generator operation except the main
generator can be repelitively swept between two
selected frequencies either linearly or logarithmicly at
a selected sweep rate. The relationship of internal
ramp and main generator ls shown In figure 3-5.
The following steps describe the sweep opération
setup.
STOP
FREQ
GCV LEVEL
OUT
START
FREQ |
LEVEL |
500 rr
OUT 5
| |
START FREQ STOP FREOQ
DIAL SETTING CONTROL
Figure 3-5. Effect of Sweep Time and Width
on Output Frequency
Step Control setting
1 MODE: CONT 8 Press to release,
(Continuous mode of
main generator is
necessary for sweep.)
Step Control
2 Frequency dial 1
SWEEP's CONT 5
1
4 SWEISTOP 6
ы STOP 3
6 Time 10
3.2.5 Wavelorms
Setting
select sweep start
frequency
Depressed. (Selects
sweap submode of main
generator's continuous
operation.)
Press 10 release. (Ex-
tended allows setting al
stop frequency.)
Select the stop Ireguen-
cy. (The stop frequency
will always be higher
than the start frequen-
Cy.)
sets the internal sweep
rate
Wavetorm timing Tor each mode ol operation 15 shown
in figure 3-5
[16
OFFSET FERIDD
| AMPLITUDE
! | |
0 Vac -
г, mo a Fa и Fi
SINE AAN
1
CONTINUOUS iE ;
в 1 E Fi A ;
MODE ТРАНСЕ Л, ААА EAN
SQUARE | | | | | || Ll | | | |
SYNC LI LLL rr rrr
THE INGA т
TRIGGERED SINE Y y
MODE ia E
TRIANGLE "e
SQUARE | |” тг
TRIG IN £2 Горы
SINE — = wy] = а mr F4
GATED FA м
MODE TRIANGLE —" A, ~ AA
a EEE TT
Figure 3-5. Wavetorm Characteristics
SWPP
STOP COREE Te a) SWP |
| Lge a GENERATOR |
— RAMP
> , BUFFER
e Y
e GCY
Zp ” BUFF
+
= a A,
Li SOI
MPARATOR =
DIAL = | SH,
=
| Î
3 | E
CON
| | ec
Y | | |
2] | DIODE Ey TRIANGLE
VG | | GATE | —— > AMPLIFIER
VCG
IM
= ENCY MULTIPLIER
— 15 т FREQU
CAPACITANCE
MAN MULTIPLIER
TRIG
TRIGGER
7 Li DIODES т
Е TRIGGER | ee TRIGGER
AR LOGIC |
т
CONT, TRIG
GATE MODE
SWITCHING
Figure 4-1.
4-0
FLIP-FLOP
Function Block Diagram
—
Y 3
BASELINE
COMPENSATION
+15 =13
+15М —15М +5
EB 1 ==
POWER
SUPPLY
= БМ
SWF
OUT
E GCV ©
OUT
L вумс |
BUFFER | EE O
OUT
(TTL)
PREAMPLIFIER
SINE — |
CONVERTER de +
A, AMPLITUDE &—
or | OUTPUT
FUNCTION AMPLIFIER AD
SWITCH al li
+
oC OFFSET mr” — NS 0)
This section describes the functions of major circuit
alements and their relationships to one another as
shown in figure 4-1, functional block diagram. The fol-
lowing sections in this manual provide more detailed
information for maintaining the instrument.
As shown in figure 4-1, the VCG (Voltage Control of
Generator) sums voltage inputs from Ihe frequency
dial and the VCG IN connector. This sum voltage con-
trols the magnitude of a complementary current
source and current sink, This current varies linearly
from approximately 2 mA to 2 pA over a 1000:1 (4.0 to
004) range or logarithmically from approximately
2 ma to 0.2 ga over a 10,000:1 (4.0 to .0004) range of
each frequency multiplier. The VCG also controls the
trigger baseline compensation circuit, which consists
of another current sink at twice the current
magnitude.
The diode gate, controlled by the comparalor ouipul,
connects either the current source or the current sink
lo the timing capacitor selected by the frequency
multinlier. When the current source is switched in, the
charge on the timing capacitor will rise linearly, pro-
ducing the positive-going triangle slope. Likewise, Ihe
current sink produces the negative-going triangle
slope.
The triangle amplifier is a unity gain amplifier whose
output is fed to the comparator and to the oulpul cir-
cults. The comparator operates as a window detector
with limit points set to the triangle peaks, The + 2\
output is sent back to the diode gate and 10 the oulpul
circuits. When the output is + 2V, the Triangle 15
positivegoing until the + 1.25v limit is reached and
the comparator output switches to —2V. When the
outout Is — 2V, the triangle is negalive-going until the
— 1.28Y limit is reached and the comparator oulpul
switches back to + 2V, repeating the process. In this
manner. the basic function generator 1666, Ihe DOO
path in figure 4-1, produces simultaneous genaration
of triangle and square waves al the same frequency
The output frequency is determined by the magnilude
SECTION 4
CIRCUIT DESCRIPTION
of the timing capacitor selected by the frequency
multiplier switches and by the magnitude of the cur-
rants supplied lo and removed from it. Since the cur-
rents are linearily proportional to the sum of the VCG
inputs, so will be the oulpui frequency.
To extend the lower frequency capability of the
generator, a capacitance multiplier circuit divides
VCG currents by 10 (effectively multiplying the timing
capacitor by 10) for each of the lower 3 multiplier
ranges.
The TTL square from the comparator is buffered and
sent to the SYNC QUT TTL connector, The olher side
is sent to the trigger flip-flop and to a level shifter to
produce the = 2V bipolar square for the diode gate
and the square shaper circuits. The square shaper
converts the square into a current signal and applies It
to the "|, FUNCTION switch. The buffered triangle is
applied to the FUNCTION switch and 10 the sine
converter inpul. The sine converter, using the
nonlinear characteristics of ils diodes, converts the
triangle into a sinusoidal current for the “\, FUNC-
TION switch.
The selected function is sent lo the preamplifier,
where il is inverted and buffered. The preamplifier Out-
put goes to the output amplifier through the
AMPLITUDE control where It is summed with offset
voltage from the DC OFFSET control, Here, wavetorm
and offset are inverted and amplified toa + 10V peak
signal which can drive a 501 termination from a 500
source impedance. The output amplifier drives Ihe
500 OUT HI conneclor and a resistor divider produc-
ing the 500 QUT LO output.
Noncontinuous modes of operation (trigger and gate)
result from allowing or preventing the VUE current
source from charging the timing capacitor, whenever
the trigger flip-flop output is low, each of the two trig-
ger diodes conduct a current TI, sourcing 21 to the
baseline compensation circuit. This removes the cur-
rent 1 from the VCG current source and forces a OV
baseline al the triangle amplifier input,
4-1
when Ihe CONT switch is released, trigger logic is in-
hibited from passing any trigger signals and the trig-
ger flip-flop oulpul is held high. This prevents the trig-
ger diodes from conducting and the generator loop
operates continuously.
When the CONT switch is pressed, the generator loop
IS held at the OV baseline. Pressing the TRIGIGATE
switch puts the instrument in triggered mode and any
external or manual trigger signals at the trigger logic
input will be transformed into a narrow pulse cor-
responding to the low-to-high transition of the trigger
input. This pulse sets the trigger flip-flop high and
allows the generator loop to run. When the triangle
negative peak is reached, the comparator low-to-high
ransition clocks the trigger flip-flop low and. when the
OV baseline level Is reached, Ihe generator loop again
stops. The result is a single cycle generated after
the triggering signal corresponding to 0 to 360° of
phase. Successive triggered waveforms always start
al the same 0° point
Releasing the TRIGIGATE switch puts the instrument
in the gated mode. This is identical to the triggered
mode, except the trigger flip-flop is held high for the
full duration of the triggering signal. The generator
produces continuous waveforms during the time the
external signal is high or the manual trigger switch is
4-2
held in. The last triggered cycle started is always com-
pieled and successive gated bursts always start at the
UP mori
when sweep mode is selected by a combination of
the main generator in continuous mode and the ramp
generator swilches set to SWP, the ramp generator is
enabled and a ramp voltage becomes part of the con-
rol voitage in the YCG circuit to control the main
generator frequency. Ramp period, variable from
JU ms to 1 minute, is set by the TIME Control. Ramp
generator output is buffered to drive the sweep output
and VCG circuit, The ramp magnitude supoling the
VCG input is controlled by the STOP potentiometer,
Selecting the stop switch position biases the buffer
amplifier to à level equal to the positive peak of the
ramp { + V). In this static mode the upper sweep limit
can be set by the STOP Control.
when the CONT position of the SWEEP switch is
selected the ramp generator is disabled and the bul-
tered ramp is disconnected from the VCG input.
The GCV (Generator Control Voltage) from the VCG
circuit is a resultant voltage from the three VCG in-
puts: dial, VCG IN and sweep ramp. This voltage Es
buffered and made available at the GCV BNC
51 FACTORY REPAIR
Wavetek maintains a factory repair department for
those customers nol possessing the necessary per-
gannel or test equipment to maintain the instrument, i
an instrument is returned to the factory for alignment
or repair, a detailed description of the specific
problem should be attached to minimize turnaround
time
5.2 REQUIRED TEST EQUIPMENT
Voltmeter . Millivolt de measurement (1% accuracy)
Oscilloscope = 60 MHz bandwidth
Counter 4 MHz (0.1% accuracy)
500 Feedihru
Distortion Analyzer
RGS8U Coax Cable
+ 15% accuracy, 2W
To 400 kHz
3 ft length BNC male contacts
5.3 REMOVING GENERATOR COVERS
1. Invert the instrument and remove the Tour
Scrrews in the bottom cover.
2 Turn the instrument upright; remove the top
cover for access lo generator ahgnrment con
115
= When alignment is complete, secure the bottom
cover wilh four Screws.
NOTE
Remove the cover only when it is neces:
sary to make adjustments or measure-
ments
SECTION J
ALIGNMENT
5.4 ALIGNMENT
After referring to the following preliminary data, per-
form alignment, as necessary, per table 5-1. If per-
forming partial alignment, check previous settings
and adjustments for applicability. See figures 51 and
5-2 Tor alignment control location
1 All measurements made at the FUNCTION QUT
connector must be terminated into a 500 (+ 1%)
load
à Start the alignment by connecting the unit to an
appropriale ac power source and setling the
front panel Switches as follows
POWER ON
Frequency Dial 4.0
FREQ MULT (Hz) X IK
MODE CONT CONT (released)
FUNCTION TI,
DC OFFSET OFF
AMPLITUDE МАХ
LIN/LOG LIN (released)
SWEEP's CONT CONT (released)
SWPRISTOP STOP (released)
3. Allow the unil lo warm up at least 30 minutes for
final alignment. Keep the instrument Cover on to
maintain heat, Hemove cover only to make ad-
justments or measurements.
5-1
: is | |
|| | | OH3Z
Pe = | | HINJILINK VD
L = | ET H3diM
7 PE ems | | |
cri EE | nei ПМ Tiel LUE BE AS | WE CMS ET OH37 |
— | — — и Вх ——" 1 i
an © =a T | Fo Wu Ens Е! | ú В | — - Hd/Td[L1NN dVO EF
18 ER 3 = ® | Eo A a
© Om Sef se OH | © Ne e EI
f \ rm | La gun Wo Sar DW Li — ii — | am OF JEH |
: O: BO вне ока уе ое ae geu/: = | Om
sunt 15% ER Г
A ES Hal gg! NE LIN — NIT UD
==" y y — 495330 4% INS Le Ou37 (9H ¡117 WIHL zz. C7 01 rx »
-- a E —n LAdLNO — aNIMEsSYE — ' DM ns =
e EUA si TU élu ABH mo ©, yo a e a ® e : | ©
т = — —- — |” 9 1 = = не m
Wik = 3 N ; ="
MD -- 0-0 — nL ofl NTE es LS | O 5 1 —— | 5
re i | — ОП М: Erp | J - — ma AE r L ‚= = CH ай) аи Но бу а — me | a
@, 8 1 Andino pice | Ea Er SERS LL LE ie | ee ae] =P
| | Lo Ll 1 E "ея" * пая E | ! IE = EEE 34 | Y pam fl" EL "= лы ELJ в | = 5
1 AE pr | = © 3 he = Pld Ni | = || Fa : A m
dir LLC a || Рен | z = E E A+ = Les Si el. Lo = | 5 - — | во: | = =
- Li T Y 5 Ш Е Y m un = | - г! LE ve StH | |! | дя lá | | | = =
™, RE PE en a ‚| = IH = Lim RE ' =
| EVI E 7 7 NOILNOLSIO пока 13 m= ALES Нео На ре 00 +
UTE — = RD 3NIS MT = a 178 67H di ! 207 -_ тн ой | = 5
ID es Ee sc E e | 5
mos a No i E Li He | :
Г — e — — Lo | 1 * br
1 go dé LF ~ | LA
"o | a ao 2 Пат) д | O ; E
L - | ii |
О = Of & ELE | | =
- | 7 | me] ai ! | ¢ 1 г LL — Нан | AS = =
1m SE je wm yl : gad
av Tr Tas y) ae 8
== = = в | |
} E 4 | |
Us ES О : | |
с
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5 LU
т >
FO WE |
li Пот i pm mg
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\ | En
VE À ha:
re
Table 5-1. Alignment Procedure
Test
Step| Check Tester | Point | Control Setting | Adjust Result Remark
1 | Power Voltmeater | C4 + Paragraph 5.4, Step 2 +15 +.75V Verily
Supply = 15V should track
within 30 mV
2 C5= = 15 + 75V
3 | CT + +5 + ZEV Verlfy
4 (6 = =5 +.
5 | Capacitor Sw - В RO 0 + 2\
Multiplier Wiper CAP
| Zoro MULT
ZERO
6 | Aporoximate | Counter | 500 OUT | Dial: ‚004 Rar 20 lo 25 ms
Bottom of HI (bermin- | FREG MULT: 10K LO period
thé Dial ale into LIM
Frequency SC
7 | Bottom Scope H49 | Equalize (+) Set scope 10 (—) trigger.
of tha LO and [—) haif display one full cycle,
| Dial BAL cycles Align positive transition to
Symmetry center of screen. Multiply
the horizontal display > 10.
Set scope Lo (+) trigger:
adjust R49 to align negative
transition with conter of
screen
8 | Bottom of Counter | FREQ MULT: x1K АЗ7 350 = 50} ma
the Dial | LO period
Frequency LIN
(Lin)
9 | Top of the Scope Dial: 4.0 R45 Equalize (+) Sea step 7
Dial HI and {-) hall
Symmetry BAL cycles
10 | Top of the Counter Dial; 4.0 R19 4 = 2 kHz
Dial FREQ MULT: x 1K VOG
Fréquency GAIN
(Lin)
11 FREQ MULT: x 10K | 40 +.8 kHr Verify
12 FREQ MULT: x1M CM 4 + 027 MHz
FREQ
TRIM
13 FREQ MULT: x 100K 400 +8 kHz Verify,
| If necessary, trim by
changing value of (33
14 FREQ MULT: x 100 Наб 20 z= 05 ms
CAP
MULT
+
Table 5-1. Alignment Procedure (Continued)
Test |
step) Check Tester Point | Control Setting | Adjust Result Remark
15 | FREQ MULT: x 10 25 +.6 ms Verity
| | Е
16 | | FREQ: x1 250) £5 ms
17 | Bottom ot | | Dial: .0004 R27 | 40 =2Hz Allow 1 hour
the Dial | | FREQ MULT: x 100K LO мл
Fraguentcy | | SWEEP: CONT, LOG
(Log) STOP, LOG
18 | Top of Dial: 4.0 R22 400 = 10 kHz Rapaat steps 17 and
the Dial FREQ MULT: x 100K Hi 18 once.
| Frequency | | LOG
(Log) | |
19 | Sing Distoriton | FUNCTION: RAT Adjust for 11 may be nacessary
Distortion Analyzer FREQ MULT: x 1K SINE | minimum to reduce amplitude
(Lin) | LEVEL | distortion to 5V реак.
R114
DISTOR
TION
20 | Output als Ciel FUNCTION: “ R118 10 Vp-p
Amplitude OUTPUT | (+ IWW = 0V)
| AMPL
21 | Output Voltmeter | FUMCTION: A112 0 + 50 mV
Off OFFSET |
22 | Baseline Scope MODE: Trigger E Hd | 0 +75 ту | It may be necessary
Zero LINE to trim the baseline
23 | Sweep Voltmeter | SWP OUT | SWEEP: CONT, HY 0 +7 mv
Offset (Unter- SWF, LIN [Sweep
| minated) | board]
SWEEP
OFFSET
_ ASSEMBLY REV. a
RE el Él © (Een |
ao -a- | | = EAE OO CA -
| | OD [Fit
| | Où
SWEEP J Leal |
OFFSET A 15] Om ®
0D —fii— ' —K—
sm |
Ï
ны
| | sw |
OES Ri? Fi
Os
Figure 5-2. Alignment Point Location, Sweep Board
5-4
6.1 FACTORY REPAIR
Wavetek maintains a factory repair department for
those customers not possessing the necessary per-
sonnel or test equipment to maintain the instrument. If
an instrument is returned to the factory for alignment
or repair, a detailed description of the specific prob-
lem should be attached to minimize turnaround time.
6.2 TROUBLESHOOTING TABLES
Table 6-1 gives an index of the troubleshooting tables
by indications of common problems. The tables do not
cover every possible trouble, but, when used In con-
junction with circuit descriptions and schematics. will
be an ald in systematically isolating faulty components.
6.3 TROUBLESHOOTING INDIVIDUAL
COMPONENTS
6.3.1 Transistor
1. A transistor is defective if more than one volt 15
measured across Its base-emitter junction in the
forward direction.
2. A transistor when used as a swilch may have a
few volts reverse bias voltage across base-
emitter junction.
3. It the collector and emitter voltages are the
same, bul the base emitter voltage is less than
300 mV forward voltage (or reversed blas), the
lransistor is defective.
4. A lransistor is defective if its base current is
larger than 10% of its emitter current (calculate
currants from voltage across the base and amit-
ler series resistors).
5. In a transistor differential pair {common emitter
stages), either thelr base voltages are the same
in normal operating condition, or the one with
less forward voltage across ils base emiller
junction should be off (no collector current):
otherwise, one of the transistors is defective.
SECTION b
TROUBLESHOOTING
6.3.2 Diode
A diode (except a zener) is defective if there is greater
han one volt (typically 0.7 volt) forward voltage
across il.
6.3.3 Operational Amplifier
1. The “+” and “—” inputs of an operational
amplifier will have less than 15 mV voltage dif-
ference when operating under normal conditions.
= When the output of the amplifier is connected to
the " =" input (voltage follower connection), the
output should be the same voltage as Ihe "+"
input voltage; otherwise, the operational ampli-
fier is defective.
3. If the output voltage stays at maximum positive,
the “+ inpul voltage should be more positive
than the *' — " input voltage, or vice versa: other-
wise, the operational amplifier is defective.
8.34 FET Transistor
1. No gate current should be drawn by the gate of
an FET transistor. If 50, the transistor is defective.
2. The gate-lo-sóurce voltage is always reverse
biased under a normal operating condition:
e.g., the source voltage is more positive than the
gate voltage for 2N5485, and the source voltage
IS more negalive than gate voltage for a 2N5462.
Otherwise, the FET is defective.
3. If the device supplying gate voltage to an FET
salurales, the FET has too large a Vgs (pinch off
tor the circuit and should be replaced.
6.3.5 Capacitor
1. Shorted capacitors have zero volts across their
terminals.
6-1
2. Opened capacitor can be located (but not always)
by using a good capacitor connected in parallel
with the capacitor under test and observing the
resulting effect.
6.4 GENERAL INSTRUCTIONS
when encountering a problem, it is advisable to return
as many of the front panel controls as possible Lo their
initial settings and still retain the problem. The trouble-
shooting tables in this section generally begin at these
initial settings and specify all subsequent setups.
Preset the fronl panel conirols as follows.
Control Position
Frequency Dial el 4.0
POWER ON
FREQ MULT (Hz) 1K
FUNCTION 4 i Py
DC OFFSET a PET OFF
AMPLITUDE MAX
SWEEP CONT, STOP, LIN
CAUTION
To prevent damage to components, turn
unit off while removing or replacing
components, connectors or pc boards.
The suspected malfunctioning condition should be
double checked fo eliminate the possibility of improper
sellings or connections. Before attempting fault isola-
tion, the unit should be checked for proper line
voltage selection (refer tó Section 2). A good visual in-
spection of the boards and chassis wires for damage
or overheating often saves much time.
Once the mallunction is defined, begin the isolation
procedure by selecting an indication in table 6-1
which best describes the malfunction and proceed to
the referenced Troubleshooting table.
Follow through the checks in the troubleshooting table,
using schematics and assemblies as a guide. When
positive results are not obtained, perform the in
dicated corrective procedure.
Table 6-1. Fault Isolation
Indication Table
1. Fuse blown, no power indication or no
outputs. 6-2
2, Function outputs missing or clipped 6-3
when TTL sync OK. Triangle problem.
3. Sine waveform problem, 6-4
4. Square waveform problem. 6-5
2. [TTL sync oulpul problem. 6-6
6. Generator frequency does not respond 6-7
correctly to dial and VCG input.
7. Waveform symmetry problem. 6-8
В. Problem on bottom three ranges Only, 6-9
9. Generator trigger and gate mode prob- 6-10
lem.
10. Sweep problem. 6-11
Table 6:2. Power Supplies and Generator Loop
Indication; Fuse biown, no power indicalion or no oulpuls.,
Chack
me ee БЫ m EEE m—
="
Corrective Procedure
1. Sel all controis in their initial positions (refer to paragraph 6.4).
2. Ensure line voltage maiches instrument confiquration (refer to Section 2).
Check fuse.
3. Check GI (+) and C2 (—) for + 20 to 26Y unregulated de.
6-2
Replace fuse; check for nor-
mal operation.
a, CR1 - CR4.
b. C1, C2.
Cc. Wl,
d. T1, AV1, F1 (brackel as-
sembly).
A... 5 5.
Indication: Fuse blown, no power indication ог по oulpuls.
Table 6-2. Power Supplies and Generator Loop (Continued)
i
10.
11.
12
Check
Check indicator lamp.
Check C4 (+) for +15 Vdc.
Check C5 (=) for = 15 Мас
Check UT pin 14 for +5 Vdc and U7 pin 13 for = 5 Vdc.
Check U4 pin 6 for a dc shift from approximately + 10V 10 + 15V as the
frequency dial is rotated from 4.0 to .004. Check UG pin 8 for a de shift
from = 10Vio = 15V as the frequencydial is rotated from 4.0 to 004.
Check anode CRE for approximately + 3.5 Vdc.
If amittar O11 has a 4 kHz, = 1.25V triangle, go to table 6-3.
Check for the same vollage at the gate of 09 as at the emitter of 011,
within saturation limits of the amplifier,
If the voltage at the emitter of Q11 is = + 1.25V, check cathode CR10
for approximately = 2.5V. If the voltage at the emitter of О11 18 = = 1.25V,
check cathode CR10 for approximately + 2.5V
Check US,
Corrective Procedure
D351 and VR2, wiring E34
and E33.
a. YH,
b, Excessive loading; use
board jumpers tó isolate
cause
C2.
UZ 1.
c. Excessive loading; use
board jumpers lo isolate
cause.
a, Od, Q3, U2.
b. Excessive loading; use
board jumpers 10 Isolate
cause,
oF IS
Go to table 6-7
| Goto table 6-10
09 - O11 and associated
circuitry
ur. Or and associated
circuitry.
Table 6-3. Output Circuits
Indication: Function outputs missing or clipped when TTL sync oufpu! OK, Problem with triangle waveform.
Check
Sel controls to initial positions (refer to paragraph 6.4).
Check emitter Q11 for a 4 kHz, +1.25V triangle
Select triangle function, rotate AMPLITUDE ccw, and check U13 pin 10 |
tora +1.25V triangle
Corrective Procedure
Check Tor normal operation,
Go to table 6-2.
a. R114 R118 adjustments
Db. U13.
c. 5W13.
6-3
Table 6-3. Output Cireults (Continued)
Indication: Function outputs missing or clipped when TTL sync oulpu! OK. Problem with triangle waveform,
Check Corrective Procedure
4, Rotate AMPLITUDE cw (MAX), DC OFFSET to OFF, and check 500 OUT | a. Output amplifier circuit.
(HI) tor a 20V p-p (open circuit) triangle. | b. E15, E16 wiring.
5. Check for excessive disconlinuilies al the [папок peaks near Ihe Bottom a. US.
of a frequency range (other ihan x 1 to > 100). b. SUR signal at cathode
CR10 not =2.5V.
6. Check for nonlinearities in the triangle slopes near the bottom of a Îre- a. Associated iming capaci
quency range (other than x1 to > 100). | tor or C36.
| b. US, CRE.
| c. @8, O10
7. Check for a waveform symmetry problem. | Go to table 6-8.
Table 6-4. Sine Conversion
Indication: Sine waveform problem
Check | я Corrective Procedure
1. Sel controls lo initial positions (refer lo paragraph 6.4). Check fos normal operation
2. Check emitter Q11 for a 4 kHz, + 1.25V triangle Go lo table 6-2
3. Verity that the + 1.25 triangle peaks al Ihe emilter of 011 agree à. H62, H63, HGA, ROS,
within 3% REY. RG, R70
bh. CRAB CR9 UT.
Cc. += 15V supplies.
4, Select triangle function; check for + 1.25V triangle at U13 pin 10. Go 10 lable 6-3, step 3.
5. Select sine function, check for + 1.25V sine at U13 pin 10. a. U2 circuitry
| b. SW12
6. Check sine distortion 500 OUT (HI) per calibration procedure (refer to | a. R97, R114 agjustiments.
table 5.1). b. Wavelorm symmetry, R45
adjustment and lable 6-5.
| ©. U12 circuitry
7. Check sine amplitude vs frequency per specifications (refer to section 1). | C47, C55, C56, C57
Bei
SERRE EE
2
Indication: Square waveform problem
Check
Table 6-5. Square Function
Sel controls to initial positions (refer to paragraph 6.4).
Check CH10 cathode for a 4 kHz, approximately + 2V square wave.
Select a triangle function; check U13 pin 10 for a £ 1.25V triangle
select square function; check U13 pin 10 for a = 1.25V square.
Check sguare wave at 500 OUT (HI) for the same 20V o-o (open circuif)
amplitude as Ine triangle and sine
Check riselall times of 4 MHZ sguare (500) terminated) for <50 ns.
Table 6-6. TTL Sync Output
indication: TIL sync output problem
Check
Set controls to initial positions (refer 10 paragraph 6.4).
Check US pin 1 for a TTL level, 4 kHz square.
Check US pin B fara TTL level 4 KHZ square
Check SYNC OUT TTL
Check SYNC OUT waveform at 4 MHz, using a TTL load termination or a
=
6000 resistive termination and = 3 foot AGSBU coax
== A
|
Corrective Procedure
Check for norma operation
Go to lable 6-2
Go to lable 6-3.
a. Q12, Q13 circuitry
b. SW14.
H106, H110, H111
C51, C55, C56, C57
Corectiva Procedure
Check lor normal operation
|
(0 to table 6-2
| a LE
| b. CR11, CR12
E27, E2B, E19 wiring
a. UB
0. E12 ground connection.
Table 6-7. VCG Circuit
Indication: Generalor does not respond correctly lo dial and VCG inpui
Check If Faulty, Check
Sel controls lo initial positions (refer to paragraph 6.4) | Check for normal operation
Check for approximately + 15V at E11. a. E10, E11 and E12 wining
DB. + 15V supply
Cc. Dial potentiometer
Check for 0 +5 my at U1 pin 13 UT
Check U1 pin 14 for approximately = SV. | U1,
Check that as the dial is rotated from 4.0 10 004, Ihe voltage UN
at U1 pin 14 varies [rom approximalely — 5 to Uv
Ensure that U1 pin % remains at a constant OV + 40 my as the U1, U4, and US circuits
dial is varied
Check that, as the dial is rotated from .004 to 4.0, the voltage 06, U1, and U6 circuils
at U1 pin 1 does nót saturate near — 15V or + 15Y (typica! range 15
behween — 10V and +10) and stops vanmng wilh the dial.
Check thai as the dial is rotated from .004 lo 4.0, U6 pin 8 varies from | UG, U1, and QB circuils.
approximately — 15Y tó — 10V
Check thal, as the dial 15 rotated !rom .004 lo 4.0, ne volage al
U1 pin 7 does not saturate near + 15V or — 15V (typical range is between |
+ 10V and — 10V) and stops varying with the dial. |
La ano UY Circuits.
Check that as the dial is rotated from .004 to 4.0, U4 pin 13 varies from | U4 and U1 circuits
approximately + 15\ to + 10V
Check for nonlinearity in the + 1.25V triangle at the emitter of Q11 near a. Associated timing
the bottom of the x 1K through x 1M ranges. capacitors or C36
b. US, CHG.
с. 09, O10
Check Irequencies of xX 1K, xX 10K and 100K ranges a. Adjust R19
b. C30, 31 and 32
(trimmed by G20)
Check frequency and lineariy ol > 1M range a. C34.
b. C36 nominal value,
c. C18, 18, 20 ang 21.
Check fréquencies of 1, x 10 and > 100 ranges. RB6 and table 6-9
Select log mode. Check that as the frequency dial is rolaled from | a U3
4.0 to .0004, U3 pin 4 varies from approximately = 65V to — .45V b. U1 circuit.
SEER EREERENRRN
Table 6-8. Symmetry
em ET
Indication: Waveform symmelry problem.
Check
Set controls to initial positions (refer to paragraph 6.4).
If symmetry problem appears on X 1, Хх 10, x 100 ranges only, problem
may be R90 adjustment or go to table 6-9
Periorm steps 5 through 12 of table 6-7, then return to this lable,
Verify RUN signal al cathode CRE is approximately + 3.5.
Verify UE pin 4 and US pin 15 vary rom approximately = 1010 = 15V as
dial is rotated from 4.0 to .004,
Verity amplitude of SOR signal at cathode CR10 is approximately +24.
Check US, CRE.
== es es Bam Э7, em mM
== eye reee
If Faulty, Check
Check for normal operation.
a. R49 adjustment.
b. R45 adjustment.
Go 10 table 6-10.
U1, UG, R52, R53.
a. 7 circuit
Bb. UY Cincui
С. +5V Supply
Table 6-9. Capacitance Multiplier
Indication: Problem on bottom frequency ranges only.
Check
Set controls to initial positions (refer (0 paragraph 6.4).
Check for 0 Vdc at U11 ping 2 and 6.
Check for approximately 0 Vdc at U11 pin 12.
Check for 0 Vdc +5 mV at U11 pin 10.
Select X 100 range; check U11 pin 10 for heavy oscillations,
Check that the signal at U11 pin 2 is amplified by approximately 6 at pin 12 |
(within saturation limits).
Check for the same signal at U11 pins 6 and 7 as al the emitter of (11
Ensura that R93 and RS4 are shorled in the x 100 range.
Corective Procedure
Check for normal operation
on xX 1K range.
wz - Sia
U11 circuiny,
a. F90 adjustment
b. U11 cincuany
C48, U11.
U11 circuitry.
Sa, 11 circullry,
| SWd.
Es
red
i
=
6-6
Table 6-9. Capacitance Multiplier (Continued)
Indication: Problem on bottom frequency ranges only
Check
FI AN
Check 400 Hz frequency (2.0 x 100)
Check 40 Hz frequency (2.0 x 10)
Check 4 Hz frequency (4.0 x 1)
Table 6-10. Trigger Logic
Ca
Indication: Generator Ingger and gate mode problem
Check
E.
i
oat controls lo initial positions (refer ld paragraph Y
| generator operates normally in continuous mode, go to step 7
Check for OV at US pins ? and 5
Check fora TTL lowe at U10 pin 10
Check lor 4 5V at U10 pen
Check for approximately + 3.5V at anode CRE. Check for normal contin
uous mode operation
Check thal U6 pin 4 and U6 pin 15 vary from approximately
— 15V as dial is rotated from 4.0 to .004
Go to gated mode (CONT depressed, TRIG/GATE released). Check U9 pin 2
fara TTL high
Corrective Procedure
a. Hes adjustment
5. Н89, RA5, C45
fu
I]
a
с)
п
=
=
=
|
x=
==
E
E
== с
If Faulty, Check
Check lor normal continuous
Opera th"
SO
US. + 5Y supply.
U10
CHE, GH1S, (8
LIE
FT
=
E
a. Cho, Us, (8
Bb. (x0 10 lable 6-2
Tal
Le, R52. B53
5, (30 lo lable 6-7
Mm
10
39, SW11, + 5V supply
=
Le
J
NM OLxERNECNCdNCNRCNCENEA
Table 6-10. Trigger Logic (Continued)
indication: Generator trigger and gale mode problems
Check
9,
10.
12.
1d.
14,
15,
16.
17.
18.
19
eu,
Corractive Procedure
Check U9 pin 1 for a TTL high
Check U10 pin 10 for a TTL high.
Check U10 pin 9 for TTL low.
Check anode CHE (or approximately —1.5V.
Check cathode CRE for approximately —0.7V
Check emitter O11 for 0 Мас + 100 ту.
Connect an external TTL signal to TRIG IN connector; check for the inverse
of that signal at U10 pin 10
Press TRIGIGATE switch and check for an approximate 20 ns negative
pulse at U10 pin 10 following the low-to-high transition of the external
signal (increasing the frequency of the external generator makes this
pulse more visible)
Remove the external signal and verify that U10 pin 5 goes from high to low
when the MAN TRIG switch is held depressed.
Release the TRIG/GATE switch (gated) and check that U10 pin 10 goes
from high to low when the MAN TRIG switch is pressed
Monitor S00 QUT, triangle function, for 0 Vdc baseline.
Press MAN TRIG switch and check 500 OUT for a continuous triangle
while the switch Is held, Depress TRIGI/GATE swilch (triggered) and warily
a single cycle output each time the MAN TRIG swilch is depressed.
or №
CT &
a.
b.
a
rom UT,
| D.
. UY.
‚ Н73, - 5V supply.
‚Us,
. U10
. U1D.
. e.
. CR15, QB, R78.
‚ САБ.
. US.
. UE.
. R81 adjustment.
. 09 - 011 circuitry
. E25, E26.
, CR13, CR14
.U9 SW10
. UY, SW10.
. 629.
SW11,
U10.
wo
H81, R112 adjustments.
LIMO or clock signal to U10
C29 (pulse too narrow).
6-9
Table 6-11. Sweep Circuit
Indication: Sweep or Ramp problems.
Check
6-10
Correctiva Procedure
Depress CONT (Eweep)
Extend SWPISTOP
Check E48 for + 4V,
Depress SWP/STOP.
Check collector of Q3. 4V peak ramp.
If ramp amplitude is >4V peak
If ramp amplitude is <4V peak.
Atl SWP OUT check for period change of approximately 30 ms
to 60s as the TIME control is rotated from full cow to full cw
At SWP OUT check for ramp period drift.
At E39 with STOP control full cw, ramp amplitude is 4V peak, with STOP
control full cow, ramp amplitude is OV.
a. UT.
b. SW2
U1, Q3.
01, 02
Q2, H22.
Ca.
R12, SWi, SWZ.
7.1 DRAWINGS
The following assembly drawings (with parts lists) and
schematics are in the arrangement shown below.
7.2 ORDERING PARTS
When ordering spare parts, please specify part
number, circuit reference, board, serial number ol
unit, and, if applicable, the function performed,
SECTION 7
PARTS AND SCHEMATICS
7.3 ADDENDA
Under Wavetek's product improvement program, the
latest electronic designs and circuits are Incorporated
into each Wavetek instrument as quickly as deveiop-
ment and testing permit. Because Of the time needed
to compose and print instruction manuals, it is not
always possible to include the most recent changes in
the initial printing. Whenever this occurs, addendum
pages are prepared lo summarize the changes made
and are inserted immediately inside the rear cover. If
no such pages exist, the manual is correct as printed.
yg
Drawing Drawing No.
Instrument Schematic 0004-00-0186
Chassis Assembly 0102-00-0837
Chassis Parts Lis! 1101-00-0837
Generator Board Schematic 0103-00-0835
Generator Board Assembly 1100-00-0835
Generator Board Parts List 1100-00-0835
Sweep Board Schematic 0103-00-0818
Sweep Board Assembly 1100-00-0818
Sweep Board Parts List 1100-00-0818
7-1
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PO Box 651, San Diego, Calif. 92112
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