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Manuals
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eXact Manuals
Portable Generator
119
Instruction manual
eXact 119 Instruction Manual
Function generator
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Contents
Table of Contents
Troubleshooting
Bookmarks
Table of Contents
Table of Contents
Section 1 General Description
Introduction
Mechanical Description
Case/Top and Bottom Covers
Front Panel
Rear Panel
Printed Circuit Boards
Specifications
Table 1-1 Specifications
Section 2 Installation and Operation
UNPACKING and INSPECTION
Ac Power Requirements
Fig. 2-1 Controls and Indicators
CONTROLS and INDICATORS
Table 2-1 Variable Ramp/Pulse Control
First Time Operation
Section 3 Specification Verification
General
Preparation
Procedure
Equipment
Table 3-1 Required Test and Calibration Equipment
Table 3-2 Frequency Accuracy
Table 3-3 Frequency Range
Table 3-4 VCF (Voltage Controlled Frequency)
Table 3-5 Main Output Amplitude
Table 3-6 DC Offset (Main Output)
Table 3-7 Sine Distortion
Table 3-8 Sine Frequency Response
Table 3-9 Squarewave Rise and Fall Time
Table 3-11 Ramp Time (121 Sweep Generator)
Table 3-12 Sweep Ramp
Table 3-13 Ramp Reset Time (121 Only)
Section 4 Theory of Operation
General
Fig. 4-1 Triangle Waveform
Fig. 4-2 Unsymmetrical Triangle (Ramp) Waveform
Circuit Description
Power Supply
Fig. 4-3 Diode Shaping Bridge
Summing Amplifier
Inverter
Positive and Negative Current Source
Variable Ramp/Pulse
Current Source Diode Switch
Buffer
Level Detector
TTL Gate
Squarewave Diode Switch
Sine Shaper
Sine Amplifier
Output Amplifier
Modulator (119M Only)
Sweep Generator (1 21 Only)
Section 5 Maintenance
Fuse Replacement
Disassembly for Calibration
Fig. 5-1 Retaining Screw Removal
Fig. 5-2 Top Cover- Mounting Tabs Removed from Rear Bezel
Disassembly for Parts Replacement
Calibration
Required Equipment
Preparation for Calibration
Fig. 5-3 Top Cover Removal
Fig. 5-4 Adjustment Locations
Procedure
Troubleshooting
Procedure
Table 5-1 Troubleshooting Procedure
Table 3-10 Pulse Output
Multiplier Alignment Procedure
Fig. 5-5 Removal of Multiplier Knob
Fig. 5-6 Alignment of Multiplier Knob
Fig. 6-6 Sweep Generator
Fig. 6-1 Block Diagram
Fig. 6-2 Component Layout
Fig. 6-4 Main Schematic
Fig. 6-3 Power Supply Schematic
Fig. 6-5 119M Modulator
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INSTRU CTION
MANUA
L
MODELS
1-19
&
121
FUN CTION GENERATOR
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Troubleshooting
TROUBLESHOOTING
53
Table 5-1 Troubleshooting Procedure
55
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121
119m
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