Wavetek - 148A - Generator
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Wavetek 148A
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Equipment:
148A
Date:
1981
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Information
THE MODEL 148A
Wavetek Model 148A, 20 MHz AM/FM/PM Generator is a precision
source of sine, triangle, square, ramp and pulse waveforms
plus dc voltage. The waveforms may be controlled in symmetry
as well as amplitude and dc offset. A built-in modulation
generator can modulate frequency, phase and amplitude or
modulation may be by an external source.
The generator may be run in continuous mode or triggered for
a single pulse or gated for a burst of pulses. Triggering
and gating may be by the Model 148 built-in modulation
generator or by an external source. The triggered and gated
waveform start/stop point is selectable from -90° through
+90°, Start/stop control plus dc offset control gives
haverwave capability.
The main output of waveforms may be attenuated and offset. A
TTL sync pulse is available at main generator frequencies,
and the modulation generator waveforms are available at
fixed amplitudes.
Frequency of both the main generator and the modulation
generator can be manually controlled at the front panel or
electrically controlled by external voltages.
An external sync input (Option 001) located on the rear
panel allows the instrument to be synchronized to an
external signal source.
2 Manuals
User manual
Manual type:
User manual
Pages:
21
Size:
562.6 KB
Language:
english
Revision:
6/81
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Date:
Quality:
Scanned document, all readable.
Upload date:
Feb. 22, 2008
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Service and user manual
Manual type:
Service and user manual
Pages:
68
Size:
3.6 MB
Language:
english
Revision:
Manual-ID:
Date:
August 1982
Quality:
Scanned document, reading partly badly, partly not readable.
Upload date:
Aug. 12, 2018
MD5:
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Information
SECTION 1 GENERAL DESCRIPTION Page
1.1 THE MODEL
148A..............................................................................1-1
1.2
SPECIFICATIONS..............................................................................1-1
1.2.1 Main Generator.
...........................................................................1-1
1.2.1.1
Waveforms................................................................................1-1
1.2.1.2 Operational
Modes....................................................................1-1
1.2.1.3 Modulation Modes
....................................................................1-1
1.2.1.4 Frequency
Range......................................................................1-2
1.2.1.5 Function Output
(5QQ)................................................................1-2
1.2.1.6 Adjustable Waveform Start/Stop
Point......................................1-2
1.2.1.7 DC Output and DC Offset .
......................................................1-2
1.2.1.8 External Modulation
Input..........................................................1-2
1.2.1.9
Symmetry..............................................1-2
1.2.1.10 Sync Output
(TTL)......................................................................1-2
1.2.1.11 Trigger and
Gate........................................................................1-2
1.2.1.12 Frequency
Precision...............................................1-3
1.2.1.13 Amplitude
Precision..................................................................1-3
1.2.1.14 Waveform
Characteristics...............................................1-3
1.2.1.15 External Sync
Input....................................................................1-3
1.2.3 Modulation
Generator....................................................................1-3
1.2.2.1
Waveforms................................................................................1-3
1.2.2.2 Frequency
Range......................................................................1-3
1.2.2.3 Output
(60012)............................................................................1-3
1.2.2.4 Frequency Modulation (FM
IN)..................................................1-3
1.2.2.5 Waveform
Characteristics........................................................1-3
1.2.4
General..........................................................................................1-3
1.2.3.1 Stability (for amplitude, dc offset and
frequency)......................1-3
1.2.3.2
Environmental..................................................1-3
1.2.3.3
Dimensions................................................................................1-3
1.2.3.4
Weight............................................................................1-3
1.2.3.5
Power........................................................................................1-3
1.3 ITEMS FURNISHED
..........................................................................1-4
1.4 ITEMS
REQUIRED..............................................................................1-4
1.5 TOOLS AND TEST
EQUIPMENT........................................................1-3
SECTION 2 INITIAL PREPARATION
2.1 MECHANICAL
INSTALLATION............................................2-1
2.2 ELECTRICAL
INSTALLATION............................................................2-1
2.2.1 Power
Connection..........................................................................2-1
2.2.2 Signal
Connections....................................................2-1
2.3 ELECTRICAL ACCEPTANCE
CHECKOUT..........................................2-1
2.4 PREP FOR
RESHIPMENT..................................................2-7
2-5 PREP FOR STORAGE
........................................................................2-7
SECTION 3 OPERATION
3.1 CONTROLS AND
CONNECTORS......................................................3-1
3.1.1 Main
Generator..............................................................................3-1
3.1.2 Modulation
Generator....................................................................3-3
3.1.3 Rear Panel
Connector................................................................3-3
3.2 OPERATION
......................................................................................3-3
3.2.1 Continuous
Operation....................................................................3-3
3.2.2 Triggered
Operation......................................................................3-3
3.2.3 Gated
Operation............................................................................3-4
3.2.4 Manual Triggering and
Gating........................................................3-4
3.2.5 AM
Operation................................................................................3-4
3.2.6 FM Operation............
......................................................3-4
3.2.7 Sweep
Operation........r..........................................................3-5
3.2.8 PM
Operation................................................................................3-5
SECTION 4 CIRCUIT DESCRIPTION
4.1 FUNCTIONAL BLOCK DIAGRAM
ANALYSIS....................................4-1
4.2 CIRCUIT ANALYSIS
..................................................................4-3
4.2.1 VCG
Amplifier................................................................................4-3
4.2.2 Symmetry
Control..........................................................................4-3
4.2.3 Range
Switching............................................................................4-3
4.2.4 Capacitance
Multiplier..................................................................4-5
4.2.5 Triangle
Amplifier..........................................................................4-5
4.2.6 Hysteresis
Switch..........................................................................4-5
4.2.7 Diode Gate and Timing
Capacitor..................................................4-5
4.2.8 Triangle Buffer
..............................................................................4-6
4.2.9 Signal
Shaper....................................................................4-6
4.2.10 Transconductance Multiplier
........................................................4-6
4.2.11
Preamplifier.............................................................................4-6
4.2.12 Output
Amplifier............................................................................4-6
4.2.13 Sync Amplifier/Square
Amplifier....................................................4-8
4.2.14 Trigger Signal
Limiter....................................................................4-8
4.2.15 Trigger Logic/Trigger
Amplifier......................................4-8
4.2.16 Baseline Compensation
...........................................4-9
4.2.17 Modulation Generator and Ramp
Generator..................................4-9
SECTION 5 CALIBRATION
5.1 FACTORY
REPAIR..............................................................................5-1
5.2 REQUIRED TEST
EQUIPMENT..........................................................5-1
5.3 REMOVING GENERATOR COVERS
..................................................5-1
5.4
CALIBRATION....................................................................................5-1
SECTION 6 MAINTENANCE
6.1 ROUTINE MAINTENANCE
................................................................6-1
6.1.1 Cleaning
........................................................................................6-1
6.1.2
Inspection......................................................................................6-1
6.2 REPAIR
..............................................................................................6-1
6.2.1 Repair and
Replacement................................................................6-1
6.2.2 Factory Repair
..............................................................................6-1
6.2.3
Disassembly..................................................................................6-1
6.2.4 Reassembly
..................................................................................6-1
6.3
TROUBLESHOOTING........................................................................6-2
6.4 TROUBLESHOOTING INDIVIDUAL
COMPONENTS..........................6-2
6.4.1
Transistor......................................................................................6-2
6.4.2
Diode..............................................................................................6-2
6.4.3 Operational
Amplifier....................................................................6-2
6.4.4 FET
Transistor................................................................................6-2
6.4.5 Capacitor
......................................................................................6-2
SECTION 7 PARTS AND SCHEMATICS
7.1
DRAWINGS.................................................................................7-1
7.2 ORDERING
PARTS..............................................................................7-1
7.3
ADDENDA..........................................................................................7-1
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