Wavetek - 148A - Generator
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Wavetek 148A
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Uitrusting:
148A
Datum:
1981
Categorie:
Groep:
Subgroep:
Informatie
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 Handleidingen
Gebruikershandleiding
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wavetek--148a--user--ID386.pdf
Service- en gebruikershandleiding
Handleidingen type:
Service- en gebruikershandleiding
Pagina's:
68
Grootte:
3,6 MB
Taal:
engels
Revisie:
Handmatig-ID:
Datum:
augustus 1982
Kwaliteit:
Gescand document, deels slecht leesbaar, deels niet leesbaar.
Upload datum:
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Informatie
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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