Wavetek 166 Pulse/Function Generator INSTRUCTION MANUAL
Publicité
Publicité
INSTRUCTION MANUAL
MODEL 166
50 MHz PULSE/
FUNCTION GENERATOR
WAVETEK
SAN DIEGO
9045 BALBOA AVENUE, SAN DIEGO, CALIFORNIA
INSTRUCTION MANUAL
MODEL 166
50 MHz PULSE/
FUNCTION GENERATOR
© -
1978
Wavetek
THIS DOCUMENT CONTAINS INFORMATION PRO-
PRIETARY TO WAVETEK. THE INFORMATION IN
THIS DOCUMENT IS NOTTO BE USED OR DUPLICATED
IN ANY MANNER WITHOUT THE PRIOR APPROVAL
IN WRITING OF WAVETEK.
V'VAVETE~
SAN DIEGO
9045 Balboa Ave., San Diego, Calif. 92123
P.
0.
Box 651, San Diego, California 92112
Tel 714/279-2200 TWX 910-335-2007
Manual Revision 3/80
Instrument Release F-3180
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 or 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
Wavetek.
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 is defective as a result of misuse, improper repair, or abnormal conditions or operations, repairs will be billed at cost.
Wavetek assumes no responsibility for its product being used in a 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 for 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.
Any recommendations made by Wavetek 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 or implied, and no representative or person is authorized to represent or assume for Wavetek any I iabil ity in connection with the sale of our products other than set forth herein.
SECTION 1
SECTION
2
SECTION 3
SECTION 4
SECTION 5
SECTION 6
SECTION 7
CONTENTS
GENERAL DESCRIPTION
1.1 MODEL 166 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.1 Versatility. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.2 Sweep/Function Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.3 Frequency Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.4 Amplitude Precision . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.5 Waveform Characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.6 Pulse Generator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1.2.7 General . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
INITIAL PREPARATION
2.1 MECHANICAL PREPARATION............................
2.2 ELECTRICAL INSTALLATION . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.1 Power Connection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2.2 Signal Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 ELECTRICAL ACCEPTANCE CHECK . . . . . . . . . . . . . . . . . . . . . . .
OPERATION
3.1 CONTROLS AND CONNECTORS
3.2 WAVEFORM TIMING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 OPERATING PROCEDURE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.1 Continuous, Triggered and Gated Operation . . . . . . . . . . . . . . . . . .
3.3.2 Voltage Controlled Frequency (VCG) Operation . . . . . . . . . . . . . . .
3.3.3 Sweep Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.4
Pulse Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3.5 Voltage Controlled Amplitude (VCA) Operation . . . . . . . . . . . . . . .
CIRCUIT DESCRIPTION
4.1 GENERAL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 BASIC WAVEFORM DEVELOPMENT . . . . . . . . . . . . . . . . . . . . . . .
4.3 WAVE SHAPE AND AMPLIFICATION . . . . . . . . . . . . . . . . . . . . . . .
4.4 TRIGGERED AND GATED MODES . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 SWEEP GENERATOR MODES. . . . . . . . . . . . . . . . . . . . . . . . . . . . .
CALIBRATION
5.1 FACTORY REPAIR..................................... 5-1
5.2 REQUIRED TEST EQUIPMENT. . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1
5.3 CALIBRATION........................................ 5-1
TROUBLESHOOT! NG
6.1 fNTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.2 ACCESS. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.3 TEST EQUIPMENT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6-1
6-1
6-1
PARTS AND SCHEMA TICS
7.1 DRAWINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7.2 ORDERING PARTS.................................. . . .
7.3 ADDENDA.. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4-1
4-1
4-1
4-3
4-3
7-1
7-1
7-1
3-1
3-4
3-4
3-6
3-6
3-6
3-7
3-7
2-1
2-1
2-1
2-2
2-2
1-1
1-1
1-1
1-1
1-2
1-2
1-2
1-2
1-3 iii
SAFETY
This instrument is wired for earth grounding via the facility power wiring. Do not bypass earth grounding with two wire extension cords, plug adapters, etc.
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.
WARNING notes call attention to possible injury or death hazards in subsequent operation.
CAUTiON notes cail attention to possible equipment damage in subsequent operations. v
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~N\.'HHW'
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NS!TION 1'!*•'-f.
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•ii
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vi
Figure i -
Model 166 50 MHz Pulse/Function Generator
SECTION
GENERAL DESCRIPTION
1
1.1 MODEL 166
The Model 166 Pulse/Function Generator is a combination sweep, function and pulse generator with a full complement of features in all modes of operation. The frequency range is from 0.0001 Hz (2.8 hours per cycle) to 50 MHz. Waveforms are sine, triangle, ramp, square, pulse, positive pulse and negative pulse. The waveforms may be amplitude controlled, de offset and inverted (complemented).
Pulse versatility includes variable width and independently variable leading and trailing edge transition times. The generator can be used to generate an output pulse whose width and frequency are dependent upon an external signal input.
Sweep can be logarithmic, as well as linear. The output can be stopped at the start and stop frequencies for accurate setting. Besides continuous sweep, a sweep may be triggered from the quiescent start frequency. The frequency can sweep to the upper (stop) frequency, then return to start frequency, or it can be held at the upper frequency. The duration of the sweep can be set to be from 100 seconds to
100 micro-seconds.
The generator can give a continuous output, be triggered for one cycle, or a double cycle, or gated for many cycles.
The output waveform can be presented in haverwave mode; i.e., the selected waveform starts and stops at a positive or negative peak voltage.
The signal being generated may be frequency or amplitude modulated by external signals.
1.2 SPECIFICATIONS
1.2.1 Versatility
Jnstrument operates as a sweep/function generator or a pulse generator.
1.2.2 Sweep/Function Generator
Selectable Waveforms
Sine
I\.; ,
triangle
'V , ramp
~and be inverted 180°. Ramp up-down ratio can be as large as
1:
1000. All can be amplitude and frequency modulated.
Operational Modes
Continuous: Generator oscillates continuously at selected frequency.
Triggered: Generator quiescent until triggered by external signal or manually, then generates one cycle.
Double Triggered: As triggered mode, except two cycles are generated.
Triggered Haverwave: As triggered mode. Output is one cycle starting at -90° (or +90°).
Gated: As triggered, except output continues for duration of gate.
Gated Haverwave: As gated. Output is a burst of cycles starting at -90° (or +90°).
Continuous Sweep:
Generator frequency continuously sweeps up from start to stop frequency.
Triggered Sweep: Generator oscillates at sweep start frequency until triggered, then generates one sweep to the stop frequency and returns to the start frequency.
Sweep and Hold: As triggered sweep mode, except the generator remains at stop frequency unt11 the trigger signal falls, then returns to start frequency.
Frequency Range
0.0001 Hz to 50 MHz in 11 ranges. Maximum sweep 1000: 1 in linear or logarithmic mode.
Sweep Time Range
100s to 100
µs in
6 ranges.
Function Output
Variable to 30V p-p into open circuit ( 15V p-p into 50Q).
DC offset of waveform is adjustable to ±10V open circuit
(±5V into 50Q). Voltage attenuation 0 to 80 dB: to 60 dB in 20 dB steps, plus 20 dB continuous vernier.
1-1
Low Frequency Hold
Function output will hold at the instantaneous voltage level when the hold switch is depressed. Effective in the X 0.001 Hz to X 10 Hz ranges.
Amplitude Drift: Less than 0.2% of amplitude per minute.
Step Attenuator Accuracy
±0.3 dB per 20 dB step to 100 kHz.
1.2.5 Waveform Characteristics
DC Offset
DC offset of all waveforms is adustable to ±10V open circuit
(±5V into 50n). Waveform plus offset is limited to ±15V open circuit (±7.SV into 50n).
Sine Distortion (Test at 10V p-p normal sine wave)
Less than O.S% for 10 Hz to 100 kHz.
All harmonics greater than:
30 dB down for 100 kHz to 5 MHz;
20 dB down for S to 50 MHz.
GCV Outpul
0 to SV (nominal, open circuit) proportional to the frequency of the main generator. Output impedance is 600n.
Triangle Linearity
Greater than 99% for O.OOS Hz to 100 kHz.
Sweep Output
0 to +5V (nominal, open circuit) ramp. Output impedance is 600n. Sweep time is 1 OOs to 100
µs.
Square Wave Aberrations (Test at 10Vp-p)
Less than 5% of p-p voltage.
1.2.6 Pulse Generator
VCG (FM) - Voltage Controlled Generator
Up to 1000: 1 frequency change with external 0 to +5V signal.
Mode: Linear or logarithmic.
Slew Rate: 2% of range per
µs.
VCG Linearity: 0.0005 Hz to 50 kHz ±0.5% of range.
Pulses
Variable amplitude positive or complementary pulsesn__J,
Lii. Pulse amplitude, width and rise/fall times are independently adjustable and independent of frequency. TTL and TTL pulse widths are simultaneous with main pulse.
AM and FM modulation. All pulses can drive son terminations.
Voltage Controlled Amplitude (AM)
0 to ±5V gives 0 to 30V amplitude change. AC input allows
0 to 200% modulation (suppressed carrier).
AC Input Range: SV minimum for 100%, 10V minimum for 200% AM.
Input Impedance: 4.99 to 10 kn, depending on gain control.
-------ini:>u_i_Bandwidth: 10 kHz.
Operational Modes
Continuous, Triggered, Double Triggered, Gated and Continuous Sweep. (See Sweep/Function Generator.)
External Width: An external signal at the trigger input
- --- detemrineslhe-uutpULpatse-width--arrdfrequerrcy:-
Trigger Input
Trigger Signal: 1V p-p minimum.
Trigger Level: ±5V.
Input Impedance: 1.S kn, 30 pF.
Maximum Repetition Rate: 2S MHz.
1.2.3 Frequency Precision
Dial Accuracy (For rv ,
/'y ,
'l.J and linear dial settings of 0.5 to 5)
±2% of full scale for 0.0005 Hz to S MHz.
+
15%, - 6% of full scale for 5 to 50 MHz.
Pulse Period Range
Pulse period is selectable from 20 ns to 1 O,OOOs (SO MHz to
0.0001 Hz) with approximately 1% vernier.
Pulse Width
10 ns to 100 ms in 7 ranges. Maximum duty cycle is 70% for periods to 200 ns, decreasing to SO% for 20 ns periods.
Control has nominal SO% duty cycle detent.
Transition Time
7 ns to 50 ms in 7 ranges, independently variable for leading and trailing edges.
1.2.4 Amplitude Precision
Amplitude Change With Frequency
Sine and square variations less than:
±0.1 dB to 100 kHz;
±0.2 dB to 1 MHz;
± 3 dB to 50 MHz.
Function Output
0 to ±1 SV into open circuit and 0 to ±7 .5V into son.
Voltage attenuation 0 to 80 dB: to 60 dB in 20 dB steps, plus 20 dB continuous vernier.
TTL and TTL Pulses
Transition times less than 4 ns into son termination.
1-2
1.2. 7 General
Stability
Amplitude, de offset and frequency in linear mode to
500 kHz.
Short Term: ±0.05% for 10 minutes.
Long Term: ±0.25% for 24 hours.
Environmental
Specifications apply at 25°C ±5°C after 30 minute warm-up.
Instrument will operate from 0°C to +50°C.
Dimensions
36.2 cm (14% in.) wide; 13.3 cm (5% in.) high; 38.1 cm
(15 in.) deep.
Weight
9.8 kg (21 % lb) net; 12.5 kg (27% lb) shipping.
Power
108 to 132V or 216 to 250V; 50 to 400 Hz; 50 watts nominal.
1-3
SECTION
INITIAL PREPARATION
2
2.1
MECHANICAL PREPARATION
After unpacking the instrument, visually inspect all external parts for possible damage to connectors, surface 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 reshipment is required.
2.2 ELECTRICAL INSTALLATION
2.2.1 Power Connection
WARNING
To preclude injury or death due to shock, the third wire earth ground must be continuous to the facility power outlet. Before connecting to the facility power outlet, examine extension cords, autotransformers, etc., between the instrument and the facility power outlet for a continuous earth ground path. The earth ground path can be identified at the plug on the instrument power cord; of the three terminals, the earth ground terminal is the nonmatching shape, usually cylindrical.
Card Position
100
120
220
240
Input Vac
90 to 105
108 to 126
198 to 231
216 to 250
Fuse
(Slow Blow, 3 AG)
0.5 amp
0.5 amp
0.25 amp
0.25 amp
1. Disconnect the power cord at the instrument, open fuse holder cover door and rotate FUSE PU LL to left to remove the fuse (figure 2-1).
CAUTION
To prevent damage to the instrument, check for proper match of line and instrument voltage and proper fuse type and rating.
NOTE
Unless otherwise specified at the time of purchase, this instrument was shipped from the factory with the power transformer connected for operation on a 108 to 126 Vac line supply and with a 0.5 amp slow blow fuse.
Conversion to other input voltages requires a change in rear panel fuse-holder voltage card position and fuse according to the following table and procedure.
Figure
2-1. Fuse Holder on Rear of Instrument
2. Remove the small printed circuit board and select operating voltage by orienting the printed circuit board to position the desired voltage on the top left side. Push the board firmly into its module slot.
3. Rotate the FUSE PULL back into the normal position and insert the correct fuse into the fuse holder. Close the cover door.
4.
Connect the ac line cord to the mating connector at the rear of the unit and the power source.
2-1
2.2.2 Signal Connections
Use RGSSU son shielded cables equipped with female BNC connectors to distribute input and output signals when connecting this instrument to associated equipment.
2.3 ELECTRICAL ACCEPTANCE CHECK
This checkout procedure verifies the generator operation. If a malfunction is found, refer to the Warranty in the front of this manual. A 2 channel oscilloscope, a fitting and son load, a tee son coax cables are needed for this procedure
(see figures 2-2 through 2-S).
Preset the pulse generator controls as follows:
0 0 0
MODEL 166
FUNC
OUT
Figure 2-2. Initial Setup
SCOPE
SCOPE
MODEL 166
Control
FREQUENCY Dial
FREQ Range
FREQ VERNIER
GEN MODE
TRIG LEVEL
LIN/LOG
DC OFFSET
VCA GAIN
WAVEFORM
OUTPUT ATTEN
OUTPUT ATTEN VERNIER
NORM/INVERT
SWEEP-MOUE.
SWEEP STOP
SWEEP TIME
SWEEP TIME VARIABLE
PULSE WIDTH
PULSE WIDTH VARIABLE
TRANSITION TIME
LEADING EDGE
TRAILING EDGE
POWER
Position
X1K cw
CONT
10 o'clock
LIN
OFF ccw
!\_;
0 cw
NORM
COITT-SWP cw
10s I 1 s
12 o'clock
'L cw
7 ns
I 50 ns cw cw
ON
00
TRIG
IN
Figure 2-3. VCG Setup
MODEL 166
FUNC
OUT
FUNC
OUT
Figure 2-4. Trigger Setup
SCOPE
SCOPE
MODEL 166
0
VCA
IN
FUNC
OUT
Figure 2-5. VCA Setup
2-2
Step
5
6
2
3
4
7
8
9
10
Table 2-1. Initial Checkout
Controi
Position/Operation
Connect instrument as shown in figure 2-2 and sync scope to TTL output.
FREQ VERNIER Rotate ccw, then cw.
Observation
I
I~~~.
1 kHz sine wave, 15V p-p. de signal. Approximately 1 V.
I
I
CH1: A small change in frequency ( 1 % of range).
I
CH1:
Frequency increases from ccw to cvv positions.
FREQ
Range Check each position. Return to x
1.
HOLD
Press and hold. Release.
Waveform stops and holds at a de level. Waveform continuous when switch is released.
FREQ Range X 1K.
OUTPUT A TTEN
Rotate ccw. Return to cw.
VERNIER
OUTPUT ATTEN
Check each position. Return to 0.
Amplitude of waveform decreases for ccw change.
Amplitude of waveform decreases in decade steps as attenuation increases.
OUTPUT ATTEN
Rotate to 9 o'clock.
VERNIER
DC OFFSET Rotate cw thru -, 0 to +.
Return to OFF.
Waveform moves to a negative offset, then to a positive offset, as the control is rotated cw. Waveform clipping may occur at and + ends of control.
OUTPUT ATTEN Vernier cw.
VERNIER
11 WAVEFORM Check each position. Return to n_____J •
Each waveform is present;
IL.._J and U I are both positive going OV to +7.5V, but complementary to each other.
NOTE: For proper waveform output in steps 12 through 16, the pulse period must be several times longer than the pulse width and transition time. Change the FREQ range whenever necessary.
12
13
14
15
PULSE WIDTH
PULSE W!OTH
VARIABLE
Rotate to each position. Return to
10
µs
I 100
µs.
I
Rotate ccw. Return to cw.
TRANSITION
TIME
Rotate to each position. Return to 500 ns I 5
LEADING EDGE Rotate ccw. ns.
I s_w positi.Qns.
Waveform rise time increases, then returns to
\ original time.
~~--~---. ~,
.... -...
.
..----
..
--
..
-..
...----.........__.
......... .
Pulse
'J'!;dtf:
~ecomes i:arr·m•.1, ro,turris to \•.1ide
I
I
Transition time decreases ccw and increases cw.
2-3
2-4
Step
16
17
Control
Initial Checkout (Continued)
Position/Operation
TRAILING EDGE Rotate ccw.
Observation
Waveform fall time increases, then returns to original time.
FREQ Range XlK
18
NORM/INVERT INVERT, then NORM Waveform changes from positive pulse to negative pulse.
19
' l ( )
LU
21
22
WAVEFORM
!\;
~JOR~v1/!NVERT 11\1\IC:DT .._1~~~ l\lf"'ID~A
11\1.
\I
~I\ i r d1t;11 1 \ I U l l l i / 1 .
Connect instrument as shown in figure 2-3.
FREQUENCY Dial
Full cw. Sync the scope to CHl (FUNC OUT).
23 GEN MODE
24
SWEEP TIME
25 LIN/LOG
Waveform phase shifts 180°, from one switch posi ti un tu the other.
SWEEP.
Check each position. Return to
100 ms I 10 ms.
LOG. Return to LIN.
CHl: Waveform is swept from a low frequency to a high frequency.
CH2: 0 to 5V ramp for each burst of swept waveforms.
Waveform is swept from a low frequency to a high frequency.
As the switch is rotated cw, the sweep duration decreases. (Observe CH2 on fast times.)
CH 1: Waveform has longer low frequency sweep in LOG mode .
. eHz: togarithmic-ramp inlOG mode.
Ccw increases sweep duration. 26
27
SWEEP TIME
VARIABLE
SWEEP MODE
Rotate ccw. Return to cw.
SWP START.
29
30
31
28 FREQUENCY Dial Rotate from cw to ccw.
Return to cw.
SWEEP MODE SWP STOP.
SWEEP STOP
SWEEP MODE
Rotate ccw. Return to cw.
TRIG SWP.
32
MAN TRIG
Press and release (try several times).
CH 1: Frequency approximately 50 Hz.
CH2: 0 Vdc.
CH2: DC level increases from 0 to 5V, returns to ov.
CH2: Approximately 5V.
CH2: DC level decreases, returns to 5V.
CH 1: Frequency approximately 50 Hz.
CH2: OV.
One burst of swept waveform, then returns to start frequency.
42
43
44
45
46
47
48
35
36
37
38
Step
33
34
39
40
41
49
50
Control
SWEEP MODE
MAN TRIG
SWEEP MODE
FREQUENCY
GEN MODE
GEN MODE
GEN MODE
GEN MODE
GEN MODE
WAVEFORM
GEN MODE
TRIG LEVEL
GEN MODE
OUTPUT
VERNIER
WAVEFORM
VCA GAIN
Initial Checkout (Continued)
Observation PositioniOperation
I
SWP HOLD.
I
Press and hold, then release.
Waveform sweeps up to high frequency and remains while switch is held, returns to start frequency when switch is released.
I
CONTSWP
1 l
Connect instrument as shown in figure 2-4.
TRIG. (Trigger scope on CH2.)
Adjust scope for several triggered cycles.
CH 1: Each waveform is one complete cycle.
CH2: 0 to 5V ramp.
DBL TRIG.
I
Each waveform is two complete cycles.
TRIG HAV. Each waveform is one cycle starting and ending at -90°.
GATED.
Adjust scope for several bursts of waveforms.
GATED HAV.
J
Waveforms are in bursts of approximately
100 ms.
I
Burst of waveforms start at -90° and end at -90°. fl__J_
EXT WIDTH.
Rotate slowly.
Return to 10 o'clock.
Connect instrument as shown in figure 2-5.
CONT.
12 o'clock.
I Pulse waveform.
Pulse varies in width.
Returns to original width.
Rotate from ccw to cw.
I
CH 1: Low to high amplitude bursts of waveforms. i
Amplitude modulation increases from 0 to
[maximum.
I
I
I
2-5
SECTION
OPERATION
3
3.1 CONTROLS AND CONNECTORS
The controls and connectors for the Model 166 are shown in figure 3-1. The listing below discusses each control and its function.
FREQUENCY/SWEEP START Dial -
The main frequency control. The setting on this dial multiplied by the frequency range (FR EO) setting is the basic output frequency of· the generator. The dial sets the sweep start frequency when SWEEP mode (5) is selected. (The FREQ VERNIER and VCG IN also affect the generator frequency.) The outer scale has linear distribution; the inner has logarithmic (2). The dial index mark lights when power is on.
LIN/LOG Switch This switch selects a linear change in frequency or a logarithmic change in frequency when sweeping (20), frequency modulating (23) or using the frequency dial ( 1).
FREQ Range Switch The 11 position outer switch selects the generator frequency range, which, when multiplied by the frequency dial setting ( 1), determines the basic output frequency of the generator.
VERNIER Control The inner knob allows fine control over the output frequency. A complete turn of this vernier is equivalent to approximately one half of the smallest division on the main frequency dial
(1). When in the full clockwise position (CAL), the settings on the main dial will be accurate.
Figure 3-1. Controls and Connectors
3-1
HOLD Switch This switch holds the output at its instantaneous voltage level. Operable in the X .001 through X 10 FREQ ranges (3) only.
0
GEN MODE Switch The outer,
8 position switch selects the operating mode of the main generator as follows: a. CONT Mode The generator operates continuously as a standard Voltage Controlled Generator
(VCG). Frequency output is determined by front panel control settings in conjunction with external control voltage at VCG IN (23). b. TRIG Mode - The generator will give one complete l;yde
\5LarliiiY al
0°) uf uulj.Jui. vvl1en lhe
MAN
TRIG (6) is pressed or for each cycle of signal applied to TRIG IN (21). A convenient trigger source is the SWEEP OUT signal (17), since the internal sweep operates independently of the main generator. c. DBL TRIG Mode - As for TRIG mode, except two cycles are given. d. TRIG HAV Mode - As for TRIG mode, except the waveform (
I\;,
/'y ) starts and ends at -90°, rather than o
0
; this is a haverwave. For
~' f"1_J and
Lfl waveforms, this mode is identical to TRIG mode, except the delay between TRIG IN (21) and
FUNC OUT (12) is increased. e ;- ··
6A~ID--Mode
··..;.;: As fur-ffitfrmode;-excep t ti tat m the generator will continue to have output for the full time that the MAN TRIG switch (6) is held down or the gate signal at TRIG IN (21) exceeds the gating level set by the TRIG LEVEL control. f. GATED HAV Mode -As for TRIG HAV mode, except that the generator will continue to have output for the full time that the MAN TRIG switch (6) is held down or the gate signal at TRIG
IN (21) exceeds the gating level set by the TRIG
LEVEL control (5i. g. SWEEP Mode - The generator operates in a sweep mode determined by the SWEEP MODE switch
(20). h. EXT WIDTH Mode -
For~. fl_Jandlllwaveforms only. The main generator is disabled and the output frequency and pulse width are dependent on the external signal input at the TRIG IN
BNC (21) or the MAN TRIG switch pulse (6).
3-2
TTL OUT and FUNC OUT signals are at a de level until triggered. Output, compared to the input, can be normal fL_J or complementary
Lfl as set by the WAVEFORM switch (8), or positive
(NORM) or negative (INVERT) as set by the
NORM/INVERT switch (10).
TRIG LEVEL Control - The inner control is a continuously variable adjustment of the TRIG IN (21) circuitry. When full ccw, approximately a positive going signal of +5V or greater voltage is required for triggering (figure 3-2). In the full cw position, a positive going pulse of approximately -5V or more positive voltage is required for triggering. In the GATED mode, the generator will begin to run continuously at some position of the control cw past 12 o'clock.
When using the MAN TRIG, this control must be ccw of the midpoint.
TRIG LEVEL
CONTROL ccw~~~~~~~~~~~~~----cw
+5V
··n··
TRIG LEVEL
TRIGGER SIGNAL
MYS+--S€-A~W.-p-p
POSITIVE GOING
SIGNAL EXCEEDING
THE TRIG LEVEL
SETTING
-5V ••
.Jl. •.
Figure
3-2.
Minimum Trigger
MAN TRIG Switch When in any of the trigger modes, pressing this switch furnishes the trigger. When in any of the gate modes, this switch furnishes the gate signal for the duration that it is pressed and held down. The TRIG LEVEL control (5) must be ccw from midpoint for proper MAN TRIG operation.
DC OFFSET Control - This knob adjusts the de base line offset above (+) or below (-) signal ground to
±10 Vdc into open circuit (±5 Vdc into 50!1 load).
Waveform plus offset is limited to ±15V open circuit
(±7.5V into 50!1 load).
WAVEFORM Selector The six position outer switch selects the waveform that appears at the
FUNC OUT BNC {12i. The waveforms are sine!\;, triangle
/\v, ramp
./"'I, square ru, positive going pulse fL_J and positive going complementary pulse
Lii.
VCA GAIN Control - When amplitude modulating with a signal at the VCA (AM) IN BNC (22), the inner knob determines the level of modulation by attenuating the input signal.
OUTPUT ATTEN (dB) Control - The four position outer knob attenuates the FUNC OUT waveform and offset (12) from 0 dB (15Vp-p max into 50S1 LOAD) to -60 dB (15 mV p-p into 50.Q) in 20 dB steps. The inner VERNIER knob varies the attenuation over an additional 0 to approximately 20 dB.
Maximum attenuation is 80 dB (1.5 mV p-p into 50.Q).
NORM/INVERT Switch - This switch inverts waveform output from FUNC OUT (12L inversion is about the 0 volt axis of the non-offset waveform.
LEADING EDGE Control - For rt,
ILJ and u-1 waveforms only. The outer knob varies the leading edge transition time throughout the range indicated by the TRANSITION TIME switch (14). Transition time should not exceed the pulse width.
TRAILING EDGE Control - For rt,
ILJ and l I I waveforms only. The inner knob varies the trailing edge transition time throughout the range indicated by the TRANSITION TIME switch (14). Transition time should not exceed the "off" time of the pulse period.
FUNC OUT, 50.Q Connector - This BNC connector is the selected waveform output of the main generator.
Output level is 30V p-p maximum into an open circuit or 15V p-p maximum into a 50.Q load.
TTL OUT Connector -
This BNC connector is a source of TTL level pulses at the main generator frequency. Pulse width, but neither amplitude nor transition time are controllable. Amplitude is fixed at an inactive level of 0.0 volts and an active level of approximately 2.4 volts when loaded with 50S1.
TTL pulse width is controllable regardless of the waveform selected.
TRANSITION TIME Switch -
This seven position switch selects the range of pulse leading and trailing
·edge transition times. Actual in-range time is set by the LEADING EDGE control (11). Affects rt, fl. __ J and l I I waveforms at FUNC OUT (12). It has no effect on TTL and TTL outputs or on 1\;,1vand
~ waveforms. Transition time shouid not exceed the
"off" time of the puise period.
TTL OUT Connector -
This BNC connector is a source of TTL level pulses at the main generator frequency. Pulse characteristics are the same as for TTL pulses (13) except amplitude is fixed at an inactive leve! of approximately 2.4 volts and an active level of
0 volts when loaded with 50.Q.
PULSE WIDTH Switch - The outer eight position switch selects the pulse width range. The rt position ensures a 50% duty cycle pulse. The inner VARIABLE knob varies the pulse width throughout the range selected by the outer knob. This knob is inactive when the outer switch is in the ru position. The
-PULSE WIDTH switch affects rt, rl_J and lSI output at FUNC OUT {12) and the TTL (13) and
TTL (15) outputs. The l\;,1v and
/1 waveforms are not affected. Pulse width cannot exceed 70% of pulse period.
SWEEP OUT, 600.Q Connector - This BNC connector provides a fixed 0 to nominal +5 volts sawtooth waveform whose period is determined by the SWEEP TIME control
(18~; there is no output when SWEEP TIME is OFF. Output also depends on the SWEEP MODE control (20):
Position
SWPSTART
SWPSTOP
CONTSWP
TRIG SWP
SWPOUT ov
Approximately +5V
Sawtooth
OV until triggered, then sawtooth and return to
0
V
SWP HOLD
OV until triggered, then ramp to +5V and hold for duration of trigger, then return to OV
SWEEP TIME Switch The seven position outer knob provides a sweep duration range. The inner
VARIABLE knob selects the actual sweep time. An
OFF position ensures that the sweep generator is off and has no effect on the frequency of the main generator.
3-3
GCV Out Connector - This BNC connector provides the Generator Control Voltage, a nominal 0 to +5 volts proportional to the main generator frequency.
SWEEP MODE Switch -
The main generator frequency is controlled by the sweep generator when the
GEN MODE switch (5) is in SWEEP position; otherwise, the two generators are independent. The outer five position switch selects the mode in which the internal sweep generator affects the main generator.
The sweep start frequency is set by the FREQUENCY dial ( 1) and the sweep stop frequency is set by the inner SWEEP STOP knob (20). The sweep modes are: a. SWP ST ART Mode - The main generator operates at the freq11enr.y set by the FREQUENCY dial (1) and in the range set by the FREQ switch ( 3). This mode is used to set the sweep start frequency. signal that controls the main generator frequency.
With 0 volts in, the main generator frequency is determined by the frequency range selected and the frequency dial setting. A positive VCG voltage will increase this frequency, and a negative voltage will decrease the frequency. Operation is limited by the
FREQ range switch setting (3). A 5 volt excursion will vary the frequency up to 1000:1, linearly or logarithmically.
POWER Switch - Power is on when this pushbutton switch is in, and off when extended.
3.2 WAVEFORM TIMING
The relationship among waveforms for different modes is illustrated in figure 3-3. b. SWP STOP Mode - The main generator operates at the frequency set by the SWEEP STOP knob
(20) and in the range set by the FREQ switch (3).
This mode is used to set the sweep stop frequency. c. CONT SWP Mede - The main generator frequency is swept up from the sweep start frequency to the sweep stop frequency as preset in the SWP START mode and SWP STOP mode and in the time determined by the SWEEP TIME switch
(18); the signal immediately drops to the start frequency and sweeps again.
@·
TRIG
IN, 1.5 kn Connector - This BNC connector is de coupled with 1.5 kn, 30 pF input impedance.
Trigger signals must be 1 V p-p or greater but within the range of ±5V. The TRIG LEVEL control (5) adjusts the sensitivity of the generator to this input signal. Trigger signal width must be 25 ns or greater.
Trigger frequency must be less than 25 MHz. The trigger signal can trigger the main generator and/or the sweep generator, depending on the mode of operation selected.
VCA (AM) IN, 3 kn Connector -This BNCconnector has input impedance of 4.99 to 10 kn depending upon the VCA GAIN setting (8). With VCA GAIN fully cw,
0 to ±5 volts gives a 0 to 30 volt amplitude change;
5 Vac gives 100% modulation; 10 Vac gives 200% modulation (suppressed carrier). Increased voltages are required when the VCA GAIN control is used.
AM signal bandwidth is limited to 10 kHz.
@
VCG (FM) IN, 6 kn Connector - This BNC connector is the Voltage Controlled Generator signal input, a
3-4
3.3
OPERATING PROCEDURE
No preparation of the instrument is required beyond completion of the initial checkout given in paragraph 2.3.
It is recommended that a one-half hour warm-up period be al· lowed for the associated equipment to reach a stabilized operating temperature, and for the Model 166 to attain stated accuracies. The operator should be familiar with the controls and connectors given in paragraph 3.1 and the waveform relationships given in figure 3-3.
There are almost unlimited ways to set up the generator and waveforms that may be obtained. The following sections desCrlbe-basic--c-onriguraffons anc:rn-ow tcJ" sertnem u-p.
Notice the grouping of controls on the front panel: a. the waveform and amplitude group b. the pulse characteristics group c. the sweep group d. the frequency and operating mode group
Internally, the sweep group will be used only in sweep mode. In addition, the sweep generator can be used as an independent signal source with its own output. This is a convenient source of trigger and modulating signals for the main generator. The pulse group is used only for altered forms of the
~ , f1_J and
LJI waveforms.
The setup instructions given in the next paragraphs must necessarily be general. They are divided for five applications which can be combined as required:
SELECTED WAVEFORM
TRIGGER SIGNAL
I
MODE
I
BNC
TRiGGER
Lt::Vt::L
I (FULLY CCW)
CONT
I
FUNC
OUT
TTL
TRIG
FUNC
OUT
TTL
O V -
I
I
I ov_ f'v
I
I f'v
ln~------
1
1 n n n n n
_!_J L__J L_J
L
__J
I
I
-(\;-------
I
I
I
I I
U1JlJlJUl
Ul'------------+--
I
I
I
I
I
I
~...____
_
_ _ , _ _ _
I
1
:_n.___ ___
I
~
I
I
~'--------'---
ov_
I
DBL
I
TRIG
FUNC
OUT
TTL
TRIG
HAV
FUNC
OUT
TTL
GATED FUNG
OUT
I
I
TTL
I
I
I
GATED
I
FUNC
HAV
OUT
O V -
I
j\
_l_fl
-f
ii\
l_fl
I
I
-¥ ii\ l_n
ov_
O V -
I
I
I 1 1 r l I I I I
_u
LJ LJ LJ L _
I
I
lN\N\_
I r - , ,--, ,--,
1 1
_Jj
LJ LJ LJ
L _
I
I
_!_J n n n n
LJ
L_J L_J L__
I
:n i---'
:_n
I
~
I :u
I
:_n
I
~UV-
I
:_n
I
I I
~·-1_Jr--1LJ.--l_J~LJr--! :J--LJ~ur--LJiLJ__...
I
I , - , r - - , , - ,
LJ LJ
LJ r+--,
LJ1
_ I
I
I
I
I
ITTJlJlfL
I
I
~_JU\_J\j\J
I
J
11JlJlJ:lJL
TTL
CONT
SWEEP
FUNG
OUT
O V -
TTL
I
EXT
WIDTH
FUNC
I
OUT
I
O V -
TTL
NOTE:
INVERTED WAVEFORMS ARE INVERTED ABOUT THE av
AXIS.
TTL WAVEFORMS ARE NOT AFFECTED BY WA VE FORM INVERSION.
-I
Figure 3-3 Waveform Relationships
3-5
a. Continuous, triggered or gated operation b.
Voltage controlled frequency (VCG) operation c.
Sweep operation d.
Pulse operation e. Voltage Controlled Amplitude (VCA) operation
3.3.1 Continuous, Triggered and Gated Operation
Operation in these modes is set up using standard waveforms. After getting results with a standard waveform, refer to paragraph 3.3.4 for pulse setup, if desired.
1.
For most accurate results, place the generator in continuous mode and monitor the setup of the controls with an oscilloscope. Connect FUNC OUT to the oscilloscope and sync to this signal. It is best to use an oscilloscope with greater than 250 MHz band width or a sampling oscilloscope. To view the high frequency performance with a real-time scope, use a
50rl, 10: 1 attenuator at the scope input to reduce the capacitive loading due to the scope.
2.
Set the frequency controls for the desired frequency.
3. Select the waveform, attenuation and offset. This completes the setup for continuous mode.
4. If one of the triggered or gated modes is desired, select the mode. If triggering is manual, rQtate the TRIG
LEVEL fully ccw. This completes the setup for manual triggering or gating.
5. If an external trigger signal is to be used, connect a qualified trigger source (paragraph 3.1) to the TRIG
IN BNC and to the oscilloscope trigger input. Set the scope to trigger on the external signal. Rotate the
Model 166 TRIG LEVEL control fully ccw, then rotate cw until the desired triggering occurs.
2.
For frequency control with negative de inputs at
VCG IN, set the dial for an upper limit from which frequency is to be decreased.
3.
For modulation with an ac input at VCG IN, set the dial at the desired center frequency. Do not exceed the maximum dynamic range of the selected frequency range.
Figure 3-4 is a nomograph with examples of the frequency dial effect as a reference for VCG IN voltages. Example 1 shows that with OV VCG input (2nd column), frequency
(3rd column) is as determined by the frequency dial setting of 2 (1st column). 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 dec1 eased. {Note that the Factor of 50.Q OUI
Frequency column must be multiplied by the frequency range in order to give the actual 50Q OUT frequency.) For full 1000: 1 linear mode VCG sweep of the generator frequencies, set the FREQ VERNIER full ccw.
NOTE
The FREQ VERNIER must be rotated full ccw for 1000: 1 linear or logarithmic range.
FACTOR OF
5onouT FREQUENCY VCG
DIAL SETTING VOLTAGE FREQUENCY
(5)
5
-5Vl
.05 (.005)
-4V
(.5)
(.05)
4
3
2
(.005) .05
=3V
-2V
...... ~f\--~
(.05)
-1V i;;,-f...~
......
.......... _ ...... ..ov.
-::::...-
+1V
............
.... '?I
.t
_
.2
3
(.5)
'..t2V
+Jv'
+4V
+5V
€'~-<!
.......
~Pt..€'
4
....... ...... 1 l>
(5)
LINEAR AND (LOGARITHMIC)
Figure 3-4. VCG Voltage-to-Frequency Nomograph
3.3.2 Voltage Controlled Frequency (VCG) Operation
Set up the controls as given in paragraph 3.3.1 for continuous operation. The frequency selected will be the reference frequency. A voltage at the VCG BNC will cause the frequency to deviate from the reference frequency.
1. For frequency control with positive de inputs at VCG
IN, set the dial for a lower limit from which frequency is to be increased.
3-6
3.3.3 Sweep Operation
1.
Set SWEEP MODE to SWP START and adjust the
FREQUENCY dial and FREQ range for start sweep frequency.
2. Set SWEEP MODE to SWP STOP. Set SWEEP STOP control for the desired upper frequency.
3. Set GEN MODE switch to SWEEP and SWEEP TIME switch to the approximate sweep duration desired.
4. Set to CONT SWP mode and sync the oscilloscope with the SWEEP OUT signal. This completes the setup for continuous sweeping.
5.
If a triggered sweep mode is desired, select TRIG SWP or SWP HOLD, connect a qualified trigger source
(paragraph
3.1) to the TRIG IN BNC and to the oscilloscope trigger input. Set the scope to trigger on the external signal.
Rotate the Model
166
TRIG
LEVEL control fully ccw, then rotate cw until the desired triggering occurs.
WAVEFORM n___J (Normal)
LJI
(Complement)
OUTPUT
~1 n
r--
30 ns
~
125 ns
~
95 ns
LJ i r-
I r-
3.
Set the pulse leading and trailing edges. Pulse transition times are restricted to less than pulse width.
3.3.4 Pulse Operation
1.
Set up the controls as given in paragraph
3.3.1 for continuous operation.
For pulse operation, select
'1 , fl._j or
Ln waveform, normal or inverted
(figure 3-5).
2. Set the pulse width as desired. Keep in mind that the pulse width cannot exceed approximately
70% of the
"normal" waveform period. For wider pulses than those that can be normally obtained, set up the n___J pulse with the complement of the width that is desired, then switch to the complement pulse (
UI ).
For example, a
95 ns pulse with a
125 ns repetition rate is desired. The complement of
95 ns is
125 - 95
=
30ns
Set up a 30 ns pulse with a
125 ns repetition rate and switch to the complement pulse as shown.
3.3.5 Voltage Controlled Amplitude (VCA) Operation
Set up the controls as given in paragraph
3.3.1 for continuous operation. The amplitude selected will be the reference amplitude. A voltage at the VCA BNC will cause the output amplitude to deviate from the reference amplitude. The VCA
GAIN control can be used to attenuate the VCA input. For
AM operation,
5V p-p gives
100% amplitude control or modulation, while 10V p-p gives
200% (suppressed carrier) modulation.
OUTPUT
(With some "pulse width" and
"transition time" selected)
REMARKS
WAVEFORM NORM/INVERT SWITCH ru ru lLJ
Lil n_J
UI
NORM
INVERT
NORM
NORM
INVERT
INVERT
Amplitude is arbitrarily one.
0
--=i------1------\-----/-------}
1 Inversion rotates
'1 about 0 axis. o _j _____ \
;_ ____ }.-_ _ _ }
%1
A Oto Vppuise. a _
-:J [ _____ \ / _ _ _ _ _ _ }
11.1
The complement of
1LJ.
O - - , - - - - - ;
- -
-7
I
}
%
I
Inversion rotatesfl_Jabout 0 axis.
O
~
\ - - - - - -,
\ - - - - - - } % Inversion rotatesLJlabout 0 axis.
Figure 3-5. Comparison of Available Pulses
3-7
SECTION
CIRCUIT DESCRIPTION
4
4.1
GENERAL
The circuits summarized in figure 4-1 are placed on two circuit boards in the generator. All circuits outside the dotted lines of the Sweep and Transition Time board (-0629) are on the Main board (-0628). The manual controls and connectors are mounted on the front panel. The power supply, which is not shown, is located on the rear panel and Main board.
4.2
BASIC WAVE FORM DEVELOPMENT
The heart of the generator (the bold path in figure 4-1) is a triangle and square ~ave generator. The triangle waves are developed by charging a capacitor with constant curr~J11$ tha_!.}1_rn_~a~~e_r~~ately reversed~-~ po_t~r,:ity.
---The. pdiarit; reversal is caused
·by--~dflp-flop.ci~cuit, or hysteresis switch, that in turn produces the square waves. The flip-flop changes states, causing the constant current to. change polarity, upon detecting amplitude limits of the triangle waveforms.
The VCG dial buffer
~urns the currents from the frequency dial, frequency vernier, VCG IN connector and the sweep circuit. The VCG dial buffer is an inverting ampiifier whose output voltage can be applied directly to the GCV amplifier or through the log converter to the GCV amplifier. The output voltage of the GCV amplifier controls the positive and negative current sources. This voltage is also present at the
GCV OUT connector. For all waveforms except the ramp the currents from the two current sources are equal and linearly (logarithmically in log mode) proportional to the voltage of the VCG dial buffer output in linear (log) operation. The diode gate, which is controlled by the hysteresis switch, is used to switch the positive or negative current to the integrating capacitor selected by the frequency multiplier. If the positive current is switched into the integrating capacitor, the voltage across the capacitor will rise linearly to generate the triangle rise transition. If the current is negative, the voltage across the integrating capacitor will fall linearly to produce the fall transition.
The triangle amplifier is a unity gain amplifier whose Oljtp_u.t.. i.s...Jed to the hysteresisswitc,h. The hysteresis switch has
.tw~~-olt~-g~limit-poin.ts
(app·~;)cimatety
±1.25V) at its input.
During the time the output voltage of the triangle amplifier is rising, the output voltage of the hysteresis switch is positive, but when the output voltage of the triangle reaches
+1.25V, it triggers the hysteresis switch, causing the output to switch negative. Once the con.trot voltage into the diode gate becomes negative, it will switch the positive current out and switch the negative current in to the integrating capacitor, so that the voltage across the capacitor will reverse, starting a linear decrease of the triangle wave. When the decreasing voltage reaches -1.25V, the output of the hysteresis switch will switch back to positive, reversing the process.
This action generates the triangle waveform as shown in figure 4-2. Since the output of the hysteresis switch is a square wave, the result is simultaneous generation of a square wave and a triangle wave at the same frequency.
The output frequency is. determined .by. the magnitude of the capacitor selected by the frequency multiplier and magnitude of the current sources. Since the current sources are linearly proportional to the control voltage of the VCG circuit, the output frequency will also be linearly proportional to the control voltage. The relations become logarithmic if the log mode of operation is chosen. The capacitance multiplier is used to sink a precise amount of the current supplied to the integrating capacitor on the low frequency ranges.
4.3 WAVE SHAPE ANDAMPLIFICATiON
The output of the hysteresis switch is-shifted to MECL level and fed to the pulse width circuitry. The pulse width is determined by varying the RC time constant of an MECL one-shot. The output of the pulse width circuit feeds the
TTL and TTL buffer and the rise/fall circuit. The TTL and
TTL buffer circuit provides an approximate 0 to 2.4V output into 50 ohm load. The rise/fall circuit controls the transition time via selected RC networks, then returns the shaped square wave to the square wave clipper on the main board.
When a square or pulse mode is selected, this clipper is acti· vated to supply the signal to a pair of transistors which convert the single ended pulse to the differential input required by the multiplier.
The triangle wave from the triangle amplifier is coupled to another pair of transistors and the sine converter. This pair of transistors are turned on when triangle or ramp are selected
4-1
EXTERNAL WIDTH
SWEEP & TRANS TIME BD
(-~)
TTL&TTL
BUFFER
PULSE
WIDTH
IN
TRIG LEVEL
.,.
TRIGGER
. SQUARING
TRIG
1-+l
CONTROL
I
LLOGIC
~~~~~~~~~~~~~--1~~~~~
~
: '
VCG (FM)
IN
6k!"°2
~
FREQ
FREQ
VERNIER
LOG
CONVERTER
LIN
I
_J
I L
---------•--i
H Y S T E R E S I S - - - - - - - -. .
SWITCH
CURRENT
~~--~~~-.
POSITIVE
___ W_!.LFiC_L ru
DIODE
GATE
NEGATIVE
CURRENT 1--~~~~~-'
SOURCE
I HOLD
CAPACITOR
MULTIPLIER
SINE
CONVERTER
MAIN BO (-0628)
RISE/FALL r r
1
LEAD TRAIL
EDGE EDGE
v
MULTI-
PLIER
v
Figure 4-1. Generator Block Diagram
4-2
SWEEP
OUT
(600!"°21
~
+
DC
OFFSET
ATTEN
FUNC
OUT
(50!"°2)
~
GCV
OUT
(600!"°2)
~
TTL
OUT
(50rll
~
~
TTL
OUT
(5M2l
+
1 .25V - - - - - - -
A,B
-1.25V
2 2 c
+
_ v
I
-2.2V
A
HYSTERESIS
SWITCH
I
L
B
I I I I
Figure 4-2. Basic Generator and Timing Diagram
4.4 TRIGGERED AND GATED MODES
In the triggered and gated modes, the forward biased trigger diode sinks the current from the positive current source, thereby preventing the integrating capacitor from charging and, therefore, the generator from oscillating. The trigger pulse resets a flip-flop which reverse biases the diode, so the capacitor begins to charge. The hysteresis switch transition, which occurs when the triangle wave reaches its negative peak, clocks the flip-flop back to the original state, which prevents the voltage at the integrating capacitor from rising above ground. In the haver modes, this voltage is held at the negative triangle peak. In gated mode, the falling edge of the trig in signal (the gating signal) releases the flip-flop to clock on next hysteresis switch transition occurring at a negative triangle peak. This forward biases the trigger diode so the voltage at the integrating capacitor may not rise above the set voltage (ground or the minus peak). The double trigger is accomplished by a series of flip-flops which "count" two negative triangle peak transitions of the hysteresis switch.
In EXT WIDTH mode, the signai to be shaped is appiied to
TRIG IN where it is squared in the trigger squaring circuit before being coupled to the rise/fall circuit, from which point it follows the normal square wave path. The generator must be set to square wave of pulse to obtain an output. and convert the single ended output to the differential input needed by the multiplier. The output of the sine converter is coupled through a similar pair of transistors before reaching the multiplier.
The amplitude vernier voltage and the VCA IN voltage are summed in the summing amplifier whose output is used to control the multipliers output amplitude. The phase of the output waveform is determined by the polarity of this voltage with the NORM/INVERT switch controlling the polarity of the de from the amplitude vernier. In addition to being coupled to the modulating input of the multiplier, the output of the summing amplifier is coupled to another de amplifier which keeps the pre-amplifier summing junction at the appropriate level when normal or complimentary pulse is selected.
A current mirror is used to convert the multiplier differential output to single ended output before it is applied to the inverting pre-amplifier. The output of the pre-amplifier provides an input to the summing junction of the output amplifier. The de voltage from the DC OFFSET switch and potentiometer are also added in at the summing junction.
The signal is again inverted and amplified before it is applied to the attenuator. The attenuator provides 60 dB of attenuation in three 20 dB steps. Maximum output at 0 dB is
15V into a 50 ohm load. Arljustment between steps is provided by the vernier.
4.5 SWEEP GENERATOR MODES
The sweep generator is an independent generator with a 0 to +5V ramp out at the sweep out connector. It will drive up to 600 ohm impedance and can be used to externally trigger,
VCG or
VCA the main generator by connecting sweep out to the appropriate front panel connector.
The sweep generator can also be connected to the main generator internally by selecting SWEEP on the GEN MODE switch. The basic sweep generator consists of the current source, FET input amplifier, clamping circuit and hysteresis switch.
The current source charges a capacitor with a constant current which produces a voltage ramp across the capacitor.
The ramp is buffered by the FET amplifier and applied to the hysteresis switch. When the ramp reaches the threshold voltage of the hysteresis switch, it changes state a11d discharges the capacitor very quickly through the discharge diode. The clamping circuit clamps the peaks of the ramp to precise levels which assume 1000:
1 sweep control.
As the output of the sweep generator is internally connected to the input of the VCG dial buffer, it controls the frequency of the generator.
4-3
In SWP START mode, the sweep generator is held at its OV peak so that the start frequency may be set with the combination of the frequency dial, frequency range and vernier.
In SWP STOP mode, the sweep generator is held at its +5V peak, so that the portion of the voltage to reach the VCG dial buffer may be set in SWEEP STOP mode which determines the maximum frequency. In CONT SWP mode, the main generator is swept between the frequency limits set by sweep start and stop.
In TRIG SWP mode, the main generator oscillates at the start frequency until the trigger input triggers the sweep generator. At the end of one ramp, the main generator returns to the start frequency and waits for the next trigger pulse.
In SWP HOLD mode, the main generator oscillates at the start frequency as long as the trigger input signal is below the trigger level threshold. As the threshold is crossed, the main generator is swept up to stop frequency, where it will remain until the trigger input falls below the threshold, at which time the main generator returns to the start frequency.
4-4
SECTION
CALIBRATION
5
5.1
FACTORY REPAIR
Wavetek maintains a factory repair department for those customers not possessing the necessary personnel or test equipment to maintain the instrument. If an instrument is returned to the factory for calibration or repair, a detailed description of the specific problem should be attached to minimize turnaround time.
5.2 REQUIRED TEST EQUIPMENT
DVM . . . . . . . Millivolt de measurement (0.1 % accuracy)
Differential Osci!!oscope, Dual Channel 500 MHz bandwidth
Distortion Analyzer . . . . . . . . . . . . . . . . . . . 600 kHz
Frequency Counter . . . . . . . . . . 50 MHz (0.1 % accuracy)
5.3 CALIBRATION
Perform calibration according to table 5-1. If performing a partial calibration, check previous settings and adjustments for applicability. See figures 5-1, 5-2 and 5-3 for calibration point location.
1. Use
2. son cable for all instrument connections.
Allow the instrument to warm up at least 30 minutes for the final calibration. Keep the instrument covers on to maintain heat. Remove covers only to make adjustments or measurements.
Table 5-1. Model
166
Calibration Chart
Step Check
Tester
-
-
1 Power
DVM or
-
Supplies Differential
-
2
-;i
I
Scope
4
5
Calibration
Point Control Setting Adjust Desired Results
Remarks
I
I
I
I
I
-0645-
-0628-TP1
FREQ:
X
1K
FREQUENCY:5
-0628-TP2
FREQ VERNIER: CAL
GEN MODE: CONT
-0628-TP3 DC OFFSET: OFF
WAVEFORM:~
-0628-TP4
OUTPUT ATTEN: 0
I
R16
+12 Vdc ±50 mV All measurements are referenced to ground.
-12Vdc±100mV
+22Vdc±400 mV
-22 V de ±400 mV
OUTPUT VERNIER:
-0628-TP5 12 o'clock
SWEEP MODE:
-0645-
+5.2Vdc±20mV
R24
CONTSWP
SWEEP TIME: 10s
I
PULSE
WIDTH:~
1s
TRANSITION TIME:
7 ns I 50 ns
"LEADING EDGE: F ult ccw
1
!TRAILING EOOE: Full ccw
LIN/LOG: LIN
NORM/INVERT: NORN
I I
I i
I
I
5-1
Step Check Tester
6 Hysteresis Scope
Switch
I
Balance
I
! i
I
I
I
!
I i
I i
I
!
I i l
I
1
J f1
Am-
I plitude Zero
I
8
I ty
Am, DVM
I plitude Zero j
9 Multiplier Scope
Null
10 i
Time Sym-
! metry
I
I
,--,- .. i
I\;
Dis-
.i
· 1
. tort1on
J i
I
Distortion
Analyzer i
!
- - -i-1\-- -·,
1 2
1 · v
Offset ! Scope
I
Shift i
13
'Y
Offset
I l
Shift
I
I
I i
I
I
I
I
Table 5-1. Model 166 Calibration Chart (Continued)
Calibration
Point
-0628-TP9
I
I
I i
Control Setting Adjust Desired Results
-0628·
1
'1
Offset
R150 OV±100mV
I
I
I
I
I
Remarks l-0628-TP8
WAVEFORM:
:..ri::t
I
-0629-
~Offset
R31 -~ OV ±50 mV
I
-0628-TP6 GEN MODE: TRIG -0628- 0 Vdc ±5 mV jR86
I
FUNC OUT GEN MODE: CONT
WAVEFORM:
I\;
10UTPUT VERNIER:
J
Full ccw
-0628- As near de as
1
,R330, possible
IR334
I
WAVEFORM:~
1-0628-!Time symmetry isee figure 5-4 for equip-
1 j
Set output for 10V p-p IR46 !within ±0.1% iment setup. Set scope to
I j20 µs/div.
WAVEFORM:
I\;
j
-0628- IMinimum sine
R 103,
I
!R142
I
JTrim R216, R226 and
I
R238forlowest distortion
I
(typically 0.15%).
- . i--------- ---;---------·-·-----------·------· -.
·---~-------
-·-·· -- -·-··--· ··-- ···-· - -
-0628i
No de shift be-
1'
Neglect the de offset if
- - - - - - - - - - - 1
WAVEFORM:
'V
1
R241 !tween normal
I
-0628-joutput
R210
I
I
J any. Amplitude may be
I.different between normal and inverted.
14
I\;
Amplitude
5-2
15 Preamp
Zero
16
Output
Amplifier
Zero
I
I
I
I
I
!
I
Differential
Scope
I
I
I
I
FUNC OUT
WAVEFORM: Switch between
I\;
and ty
I
-0628-TP7
WAVEFORM:
I\;
-0628
'\J
and
'V
.
Verify or retrim R212.
R212 ±50 mV
I
I
!
-0628-1 Positive and negj
R308
I ative peak volt-
I ages are within
15 mV of each
I
I other.
I
I
.
I
.
-0628- Positive and neg-
,·
I
R248
I
. ages are within i
1
20 mV of each
1 . other.
I
I
I
I
I
Step
I
Check
I~ p .
17 'l..J
OSltive Peak
I
I
I
I
Tester fl
Differentiai
Scope
Table 5-1. Model 166 Calibration Chart (Continued)
'1'
I
Calibration
I
Point
I
Control Setting
FUNC OUT tWAVEFORM:
~w1tcn between
1\;,
and f"l.J
I
!Adjust r·•;red
Resulu
I
Remarks f -0628- Positive peaks of
'1
Verify or retrim R212.
R 198 f"l.J to
!\;
are within 50 mV
I
18
I f"l.J
Offset
Shift
I
1scope
WAVEFORM: nu
-0628- INo de shift be-
!Amplitude can be differ-
1
R203 ltween normal lent between normal and and inverted out- inverted output. put (or match to the negative
1\;
peak)
19 ru
Normal/Inverted
I
Amplitude
WAVEFORM: ru
-0628- Zero levels are
Switch between NORM R297 within 50 mV and INVERT
Neglect the de offset if any.
20 [output
(mp!itude
I
21 Trigger
Baseline
22 jHaver
Baseline
23 VCG Null
I
I
24
I
1000: 1
Time Symmetry
2.5 Symmetry at 5X1 kHz
!WAVEFORM:!\;
OUTPUT VERNIER:
Full cw
-0628-1 Peak-to-peak
R254 voltages are
I
15v ±150 mV
WAVEFORM:!\.;
-0628- 0 Vdc ±20 mV
GEN MODE: GATED
R86
I
GEN MODE: TRIG HAV
Connect SWEEP OUT to
TRIG IN
I -0628- IBaselines are at !Set the trigger level con-
I
·
R
178 the same level of jtrol to obtain a burst of
SWEEP TIME: 10 ms
I ms the negative peak
!\.;
signal.
GEN MODE: CONT -0628- Less than 1%
FREQ: X 100K
FREQUENCY: Full cw
R4 frequency shift
I
!while opening
I
1
1 aVrC,dGsh
1uN-rtti ng
!
WAVEFORM: nu
Set output to 1 OV p-p
I
1 ground
0
LIN/LOG: LOG
1
I
1-0628- Each half cycle
1
R34, f"l.J is 1.2 ms
R59 and symmetry is< 1%
I
-0628- Time symmetry
R46 within 0.1%
LIN/LOG: LIN
FREQ:X1K
FREQUENCY:5
~FREQ:
X 1M
I
FREQUENCY: 0.5
!
-0628- Tme symmetry
I
I
R47 within 0.2%
27 Symmetry at 0.5 X
10 MHz
FREQ: X 10M
-0628- Time symmetry R45 must be installed for
R45
<
1% unit to oscillate on X 10M
(trim) range. Verify or retrim.
5-3
Step Check Tester
-
28 Frequency
Frequency
Counter
I
30
31
33
34 , Low Fre-
35 Low Fre-
I
Scope jquency
!Symmetry
I
I
I
I
I
Counter quency
38 j
36 Logarithmic!
Frequency
I
.. ---·--·-·· i
I
39 High Fre-
1 quency
Waveform
Sampling
1
Scope
40 Sweep
Ramp Positive Peak
Scope
41 Sweep
Ramp Zero
Peak
I
5-4
Table 5-1. Model 166 Calibration Chart (Continued)
Calibration
Point
TTL OUT
!
I
Control Setting
IFREQ:X1K
I
1
I
I
FREQUENCY: 5
I
I
FREQ: x
100
! I
I .
Ad JU St Desired Results
-0628- 5 kHz ±10 Hz
R13
I
I
Remarks
I
I l jR 13 affects frequency jcalibration in all frequen-
I jcy ranges.
-0628-1500 Hz ±1 Hz
1
R18
!
'FREQ:X10M
I
I
FREQ: x
1M
-0628- 50MHz±500kHz IC22/23 may be added to l
C24 lower frequency.
::~8-
5 MHz
±
10 kHz
IT rim C27 ifR 15 in stops.
!
FREQ: X 100K
I
I
FREQ: x lOK
I
-0628- 500 kHz ±1 kHz !Trim C25 if R16 in stops.
R16
I
I
-0628- 50 kHz ±100 Hz
1
1
R17
I
Trim R117 if R17 in
I stops.
I
I
I
I
I
I
I
I
I
I
I
I
I
I
FUNC OUT! FREQ: X 10
I
FREQUENCY: 0.5
I
I
, -0628- Time symmetry
I
R 188
I within 0.2%
I l
I
TTL OUT
I
FREQUENCY: 5
I .
I
I
-0628-150 Hz ±0.2 Hz
R182
!
I
(20 ms ±40 µs) iTrim R181 if R182 in
I
1stops.
I
FREQUENCY: 1 (Lin -0628-j 1.99 kHz ±40 Hzlcross Reference of Dial
! scale) R50 l lDial (lin) Dial (log)
-!
FREQ:-X-WOK ---1-
I
LIN/LOG: LOG
I
I
FREQUENCY: 4
I
-r·
i
I
-0628-1125.6 kHz
R20
I
±2.5 kHz i
----------l
0
I
1
I
I
1.67
2
3
.005
.020
.050
.079
.316
3.33 .500
Repeat steps 24, 36 and 37 several times
I
4
5
1.26
5.00
I
I
FUNC OUT WAVEFORM:
I LIN/LOG: LIN
I FREQ: X 10M
'l.J
-0628- Minimum rise/
R266, fall time and
1
R285 abberation
FREQUENCY: 0.6 R351
I
I
I
SWP OUT SWEEP MODE: CONT -0629- Positive peak
(no load) SWP
R110 just starts to
SWEEP TIME: flatten
100 ms
I
10 ms
SWEEP TIME VARI-
ABLE: Full cw
I
-0629- Zero peak just
I
R107 starts to round
1
I
42 Sweep
Ramp Start
I
Tester
Table 5-1. Model 166 Calibration Chart (Continued)
Calibration
I
I
Point
I
Control Setting
I swP ouT
I swi=i::p MODE· swP
(no load) START
-
I
Adju.J Desired Results
I
I
06291 OV (0 to
5 mv)I
-
R62
Remarks
43 Final Calibration
(optional)
I
I I
Close covers and warm up for 1 hour; repeat step 11, then step 28.
Sine distortion calibrati on wil I affect all frequency calibration. Adjusting Ri3 wili restore the frequency calibration.
R24
+5.2V
ADJ
Ci S l l
.L
~
i
~
~iyy
[1
EIO E9
Figure 5-1. Power Supply (-0645) Calibration Points
5-5
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-0
MODEL 166
TTL
FUNC
OUT
OSCILLOSCOPE
D
NOTE
Set scope to normal external trigger. Use alternate or chop vertical mode. Set scope time so that one cycle just fills the screen. Using X 10 multip![cation
Of
cl_el~y
time,. expa_flcl_ time by
10. Now each cm represents 1% difference in symmetry.
CH1 CH2
0 0
I
EXT
TRIG
5-8
Figure 5-4 Time Symmetry Calibration Setup
SECTION
TROUBLESHOOTING
6
6.1
INTRODUCTION
Familiarize yourself with the Model 166 by reviewing the operating procedures as well as the circuit descriptions.
Successful fault isolation depends upon knowiedge of the correct instrument operation. The physical arrangement of the instrument and component listings are given in Section
7.
Table 6-1 lists six basic problem areas and possible causes and corrections to problems in those areas.
PROBLEM AREAS
Power Supply
Output Waveform
Time Symmetry
Frequency Accuracy
Generator Mode
Sweep Circuit
Check points, expected values and component functions are given in tables 6-2 through 6-10, the troubleshooting guides.
TROUBLESHOOTING GUIDES
Power Amplifier
AM and Preamp
Waveform Switching
Hysteresis Switch
Capacitance Multiplier
VCG Current Source
Transition Time
Sweep Circuit
6.2 ACCESS
For access to the Power Supply board (-0645) and Main board (-0628), remove the top cover. For access to the
Sweep and Transition Time board (-0629), remove the bottom cover.
6.3 TEST EQUIPMENT
Test equipment are listed in paragraph 5.2.
Problem Definition
Table 6-1. Troubleshooting
Possible Cause/Correction
POWER SUPPLY PROBLEM
1. Blown fuse 1. AC line voltage is not properly set.
Measure the ac line voltage and check for proper selection of line voltage in the unit. Refer to paragraph 2.2.1 for selection procedure.
2. Short circuit if fuse blows again after replacement.
13.
Fuse blows again or voltage output at
J 1 is not correct.
I
6-1
Problem
Table 6-1. Troubleshooting (Continued)
Definition Possible Cause/Correction
2. Power regulator
3. Power supply voltage below normal
4.
Shortisnotfoundinthe regulator.
I
15. If voltage output at J1 is normal, the short circuit is
I
I in main board or sweep board.
1. Unplug and check voltage at
J1 on power supply board.
If voltage is not normal, proceed to the followinq steps. i
Check for short circuit of transformer, power switch or defec-
1 tive CR1 - CR8, CR10 or CR11.
I
Ch eek for short circuit between collector of 01, 05, 012 or j
016 to chassis and also IC3.
I in most cases, short circuits in main board and sweep board do
I not cause blown fuses, unless the current limiting circuit in the
I
I power supply regulator has also failed. 03, 07, 011 and 015
I in power supply board are the current limiting device.
I
I
I
2.
+5.2V is normal, but all
I
±12V, ±24V supplies are abnormal.
Problem is in the +12 volt regulator; check for defective 01 -
04, IC1, CR9 and the associated circuitry.
3. Both -12V and -22V are
I abnormal.
I
I
14.
Only +22V, -22V or +5.2V is abnormal.
I
5. All regulator outputs are abnormal.
Problem is in the -12V regulator; check for defective 09 -
012, IC4 and the associated circuitry.
Check the regulator in which the output voltage is abnormal.
Check line voltage and proper selection of line voltage. Refer to paragraph 2.2.1 for line voltage selection.
L
Unplug and check voltage at
I "
J1 on power supply board.
If voltage is normal, the problem is in main circuit board or sweep board. Otherwise, refer to power regulator problem.
Check
~or ~efective transformer and loose wiring in the pri-
I mary c1rcu1t. t
Overloading the +12V supply wiii cause aii ±12V and ±22V supplies to be low. Overloading the -12V supply will cause the -22V supply to be low.
Isolate the power supply to the sweep board by unplugging J2 on sweep board.
Check for defective transistors 045 - 047 and 049 - 051 in power amplifier.
2. Both ±22V supplies below normal.
OUTPUT WAVEFORM PROBLEM
Main generator is not running. 1 . No output waveform at FUNC
OUT and TTL
OUT
2.
No output waveform at FUNC
OUT, but
TTL
OUT is normal
6-2
Ensure power supply voltages are normal and switches and controls are set properly. Triangle amplifier, hysteresis switch or current source is malfunctioning. Refer to troubleshooting tables 6-5, 6-6, and 6-8.
Problem in power amplifier, preamplifier or the AM circuit,
Refer to troubleshooting tables 6-2 and 6-3.
Problem
Table 6-1. Troubleshooting (Continued)
Definition
Possible Cause/Correction at
FUNC OUT
1. TTL OUT is normal, rii is seen at TP8 on main board,
I
I
2. TTL OUT is norma1,
1 L is not seen at TP8 on main
I board.
I
Check for defective 034, 035, CR43 - CR46 and associated
I circuitry,
Connector P15 is not plugged in.
Transition time circuit is malfunctioning; check 01 - 06 and associated circuitry on sweep board.
Transition time amplifier is malfunctioning; check 07 - 010 on sweep board.
3. rii output is normal, but no pulse width control.
4. Also no TTL out. Check for
±
2.2V
~ at emitter of 022 to ensure the triangle generator loop is functioning.
If not refer to tables 6-5,
1
1
6-6, and 6-8.
1
Check the continuity of the square wave path to locate
1
1 the defective components.
Starting from main board pins
U and 13 of pins 14 and
-
15
1J11), to
'~
1 through connector PIB,to
J16 on the sweep board.
Then on the sweep board, pins 6 and 7 of U3, to pins
2 and 3 of U4 if
1.J is selected, or pin 6 and 2 of
U5 if
_n_ is selected.
Check pulse width circuit, U5 and 018 - 020 on sweep board.
4. No sine waveform output
Al! other waveforms are normal. Check sine amplifier 038 and 039 on main board.
5. Distorted sine waveform below 100 kHz.
1. Time symmetry of
~ is not 50%
±
0.5%.
3. Defective sine converter
I
I
I
Square wave time symmetry is not calibrated correctly.
Refer to TIME SYMMETRY PROBLEM.
2. Nonlinear or distorted "\; .
I
!
If the edge of the triangle is nonlinear at all frequency
II ranges, troubleshoot the VCG current source circuit
(table 6-8).
I
Check for defective 015 and CR7 to CR11. If the peak
I of the triangle is distorted, check for defective range capa-
1 citators C22 to C31 . j
I
Check for defective CR47 to CR61.
4. Defective X-Y multiplier circuit.
Check for defective U18, 052 and 053.
6-3
Problem
Table 6-1. Troubleshooting (Continued)
Definition
Possible Cause/Correction
6. Sine distortion out o Usually square wave will show specification at freup distorted or with slow rise/ quencies above 100 fall times. kHz.
7. Transition time problem.
8. No TTL and TTL output.
Check preamplifier 054 - 063, or power amplifier 042 - 051.
Check for defective capacitors in the circuit.
Check transition time circuit, 01 - 06, on sweep board.
I
Check for defective U3, 021 - 023, on sweep board.
9. Excess of waveform rol I off at high frequency
1. Excess rolloff shown at emitter of 063.
Check for defective C126, C127, C133, C135, C145 and other frequency compensation components in this area, by connecting a capacitor in parallel with each capacitor.
C86 is open or C88 has wrong value on main board.
2. Only sine waveform rolloff excess.
3. Otherwise.
10.
Drooping on square wave (
~ square)
11.
Nonlinear triangle waveform
Check for defective capacitor in the power amplifier.
Check for defective C126 or C127 on main board.
Occurs at only one frequency range.
I
Check for defective timing capacitors C22 - C31 of the associ-
1 ated range.
2. Occurs at all frequencies and gets worse at bottom of frequency dial.
Check for defective 015 and CR7 - CR11.
TIME SYMMETRY PROBLEM
Waveform time symmetry is off and cannot be calibrated to within specifications
1 . Al I frequencies.
2. Frequency ranges
X
10 and and below.
FREQUENCY ACCURACY PROBLEM
Frequency out of specification
11. Out of specification at all ranges.
I
I
I
I
,2.
Out of specification at
X 1 OK range and up,
I
6-4
I
Usually due to the malfunctioning of the VCG current source circuit, U3 - U7, on main board. Check for leakage current at gate of 02 - 05, 07, 09 and 011. check for excess source current at input of U3 - U7.
Capacitance multiplier is malfunctioning. Check for defective
U13 - U14 on main circuit board.
I Mismatched dia! and potentiometer {R 1 ). Ensure that the number on the back of the dial matches the number on the potentiometer.
1
Check for defective components in the VCG current source,
Ul - U7 and 02 - 012 on main board.
Check for defective components C35, C36, C39, C42 - C48,
C53, C68, R97 - R99, R109, R116 and R137 - R139 on the
I main board.
Problem
Table 6-1. Troubleshooting (Continued)
Definition
Possible Cause/Correction
I
I
3. Out of specification at
X .001 Hz to X 10M.
14. Frequency problem when j
LOG is selected.
GENERATOR MODE PROBLEM
1. Generator cannot be 1. Trigger sweep mode is ok. triggered or gated
Check for defective U13- U14 and R185, R189 - R195 on
I main board.
I
Check for defective U2 and 01 on main board.
!
Check for defective 030 - 033, U 15, CR2 and the associated circuitry on main board. Troubleshoot using figure 6-1.
2. Trigger sweep mode is not operating.
2. Triggered or gated mode ok, but no triggered haverwaveform
3. No frequency sweep 1. No sweep signal at SWEEP
-~·<-··"-'
OUT.
2. SWEEP OUT is normal.
Check for defective 026, 027 and the associated circuitry on main board.
Check for defective SW2-B, CR42 and R 178 on main board.
Sweep circuit is malfunctioning. Check for defective U 1, U2,
U6, 011 - 017 on sweep board.
Check for loose wire connection between sweep board and main board.
I
Check for defective SW2-A on main board or R66 on sweep board.
SWEEP CIRCUIT PROBLEM (Unless otherwise specified, components referred to are on the sweep board)
1. No signal at SWEEP
OUT
1. Sweep signal is seen at pin 6
I of U1.
2. No sweep signal is seen at pin 6 of U1.
Check for defective U2, CR28 and CR29.
I
Refer to table 6-10.
2. Sweep signal runs continuously at
TRIG SWP and
SWP HOLD
Sweep mode control logic problem.
I
Check for defective CR53 - CR60 and SW3-B.
3. TRIG SWP and SWP
HOLD are not operating
1. Manual trigger switch has no effect.
Check for defective MAN TRIG switch and U9 on main board.
2. Cannot be triggered by MAN
TRIG or external signal at
TRIG IN.
I
Check for defective 026 and 027 on main board and 026 and
I
CR55 - CR60 on sweep board.
I
6-5
Test Point
Continuous
Mode
............. ···-············
,.-···············------····-·-----·------·--·········-·--··--------·········---···--·-·---··-,-~--·----·-----·-----~----------
Triggered Gated Gated Haversine
TRIG IN
Pin 13, 15 of U10
Pin 15 of U12
ECL
ECL
--~- -~--r~- -~-
J
...1...I_-_-
---'I
_Jl ______ _
L
_._I _ _
L ___ .......
I __
JLSLJLJLr _n__
Pin 9 of U15 ECL
Pin 15 of U15
Collector of 033
Junction of CR3 and CR6
Junction of CR4 and CR5
ECL t-2.5V
0
--1.25V
+2.5V
-2.5V
+2.5V
-2.5V
UlSLf1Jl_
LJLSlSlJl_
'~-----1
_J
I..____
- - u - -
--u-uu-
- 1 L J - - -
---I'LJl__JLJ-
~
Emitter of 019
+ 1.25V
--1.25V
~--Av-- ~A/v-- ~
·-···-·--··-·-··-·--------
..
----------·-·-----·-···
----··-···-··-----------··----·-·- -·-···------------
..
----·-···--·-"------------------·-----····-············-------------- - - - - - - -
- - - - - - - - ' - - -
Figure 6-1. Generator Mode Timing Diagram
Test Point
Junction R279 and R281.
Junction C92 and C93
Emitter of 063
040-043
Base of 044 and emitter of
045
Base of 048 and emitter of
049
046 and 047
050 and 051
C92, C93, C96-C99, C109,
C110, R266-R268 and
R284-R286
Table 6-2. Power Amplifier Troubleshooting Guide
Observation
Power amplifier output: 0 to 30 Vp-p signal.
Summing juction: 0 V with less than 2 Vac transient.
Preamp output: 0 to 4 Vp-p signal, inverted from power amplifier output
De biasing circuit for power amplifier.
+19 Vdc.
-20 Vdc.
Slow rise time if one of the transistors is open
Slow fall time if one of the transistors is open
These components affect the power amplifier frequency response the most.
Test Point
Emitter of 063
057-060
Junction of C132 and C136
Emitter of 061
Emitter of 062
C132-C137, C139-C140 and
R351
U18
Pins 6 and 12 of U18
054-056
C126 and C127
Pins 2 and 3 of U18
Pin 10 of U18
U16andU17
Table 6-3. AM and Preamp Troubleshooting Guide
I
I
Preamp output: 0 - 3 Vp-p signal.
De bias circuit for the preamp.
Observation
Summing junction, +1.8 Vdc typically.
+5.5 Vdc.
-5.5 Vdc.
I
Frequency compensation components.
AM modulator.
AM current output. Out of phase with each other.
I
Current mirror circuit: sums current from pin 12 to pin 6.
I
Excess drooping of square wave if defective.
I
Differential signal input: -4.5 Vdc level.
I
Amplitude control input:
±.
200 mV. i
Amplitude control amplifiers.
I
Test Point
038 and 039
036 and 037
034 and 035
Junction of CR43 and CR45
Junction of CR44 and CR46
Base of 037
Base of 038
CR47-CR61
Table 6-4. Waveform Switching Troubleshooting Guide
'\.; amplifier and switch.
"y ,,,/1 amplifier and switch.
WI amplifier and switch
.±
1.5 V
~approximately
±0.5 v~.
±
1.25 v
"v.
±
0.4V1'V approximately.
Sine converter diodes. Matched set.
Observation
6-7
Base of 015
Test Point
Emitter of 019
Base of 016
RS6
015 and 017
01S and 019
Test Point
Junction of
R
101 and
R
136
Pint 1 of US
Pin 4 of US
Base of 023 and 024
023
024
Emitter of 022
Emitter of 021
Pin 3 and 9 of US
C70 and C42-C44
C45-C4S
C71, C6S, C70 and C48
Table 6-5. Triangle Amplifier Troubleshooting Guide
Observation
±
1.25 V
~(input).
±
1.25 V
"v
(output).
-9 Vdc. ---·
For amplifier offset calibration.
Matched for V GS. 017 sets the bias current for 015.
Matched for VBE. Excess offset between input and output of the amplifier may be due to defective or mismatched 015 and 017, or 01S and 019.
Table 6-6. Hysteresis Switch Troubleshooting Guide
Observation
±
1.25 v
"v .
Negative peak detector input.
Positive oeak detector inout.
+6 Vdc with 1 .4
V
~
.
023 on (collector + 2V) when
"v going negative.
"v going positive. Off (collector - 2.5V) when
On/off cycle inverts from 023.
±
2.2 v ri .
2.5 Vp-p
"v .
-3 Vdc.
Negative peak compensation.
Positive peak compensation.
Compensation for frequency above 10 MHz.
Table 6-7. Capacitance Multiplier Troubleshooting Guide
Capacitance multiplier
Junction of R 195 and CSO
Used only at frequency ranges X.001 to X10.
+1.25V
-1.25V
+7.5V
Pin 6 of U13
-7.5V
+3.75V
Pin 6 of U14 (Dial at 5)
-3.75V
+3.75V
Pin 6 of U14 (Varies with
Frequency)
6-8
-3.75V
Pin 6 of U1
Pin 6 of U3
Gate of 02
Test Point
Pin 2 of U4
Pins 2 and 3 of U6
Emitter of 08
Pin 6 of U4
Pin 6 of U6
Pin 2 of U5
Pin 2 and 3 of U7
Emitter of 010
U2 and 01
Emitter of 024
Base of 013
Pins 9 and 13 of U6
026
CR53-CR60
Table 6-8. Current Source Troubleshooting Guide
I
0 to -5.6 V. Varies with frequency.
Observation
0 to +5.6 V.
I
+12
V
(02 is on) except when ramp waveform ( . / / ) is selected; then voltage is i av
(02 is off).
II
0 to 5.6 v. v·aries with frequency.
+12 to 7.3 V.
I
Approximately 4 V below emitter of 06.
I
Voltage equal or greater than voltage at Pin 3 of U6.
I
Voltage equal or greater than voltage at S of 05.
0 v.
-12 V to -6.4 V.
I
Approximately 4 V above emitter of 012.
Log converter. Used in log frequency only.
+7.5 Vdc.
± 1.2V pulse.
1 OV in CONT SWP.
I
Trigger sweep control input buffer amplifier.
I
Sweep mode control logic.
Table 6-9. Transition Time Troubleshooting Guide
Note: All components are on the sweep board
Test Point
Junctions of C1 and C2, C11 and C12
01 and 04
02 and 05
CR3-CR6
07-010
Observation
Square wave (ECL level) input to the transition time generator.
Leading edge current switch.
Trailing edge current switch.
Peak level clamp.
Unity gain amplifier. Output (emitter of 09) is± 1.2 V pulse.
Table
6-10.
Sweep Circuit Troubleshooting Guide
Note: Unless otherwise noted, the sweep generator is set to CONT SWP and SWEEP TIME to 10 ms. All components are on the sweep board.
Test Point
Base of 011
Emitter of 014
Pins 3 and 6 of U1
Pin 3 of U2
012 and 013
015
016and017
P 2 of U6
Pin 6 of U6
Observation
+6 Vdc.
+6 Vdc.
-0.2 to +5.5 V ramp.
0 to +5 V ramp.
, 012 is off and 013 is on during ramp up t;me. 012 is on and 013 :s off ·,;vher. ramp resets.
Reset current is discharged through the collector-base junction of 015.
In TRIG SWP mode, 016 and 017 hold the quiescent voltage of the ramp at pin 3 of U1 to
-200 mV, which ensures CR29 is reverse biased and output at U2 is OV.
0 V peak detector input.
+5V peak detector input.
6-9
SECTION
PARTS AND SCHEMATICS
1
7.1 DRAWINGS
The following assembly drawings, 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 of unit and the function performed.
7.3 ADDENDA
Under Wavetek's product improvement program, the latest electronic designs and circuits are incorporated into each
Wavetek instrument as quickly as development 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 to summarize the changes made and are inserted immediately inside the cover.
Drawing
Instrument Schematic
Chassis Assembly
Chassis Parts List
Main Board Schematic
Main Board Assembly
Main Board Parts List
Main Board Switch Assemblies
Shi·eld Board Assembly
Shield Board Parts List
Drawing No.
0004-00-0128
0102-00-0649
11 01-00-0649
0103-00-0628
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1100-00-0628
1202-00-0041
0101-00-0684
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Sweep and Transit Time
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Drawing No.
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0101-00-0629
11 00-00-0629
1202-00-0042
0103-00-0645
0101-00-0645
1100-00-0645
0102-00-0648
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