eXact 121 Manuals

Manuals and User Guides for eXact 121. We have 1 eXact 121 manual available for free PDF download: Instruction Manual

eXact 121 Instruction Manual

eXact 121 Instruction Manual (78 pages)

FUNCTION GENERATOR

Brand: eXact | Category: Portable Generator | Size: 1 MB

Table of Contents

Table of Contents
4
Section 1 General Description
8
Introduction
8
Mechanical Description
8
Case/Top and Bottom Covers
8
Front Panel
8
Rear Panel
8
Printed Circuit Boards
9
Specifications
9
Table 1-1 Specifications
9
Section 2 Installation and Operation
12
UNPACKING and INSPECTION
12
Ac Power Requirements
12
Fig. 2-1 Controls and Indicators
13
CONTROLS and INDICATORS
14
Table 2-1 Variable Ramp/Pulse Control
16
First Time Operation
18
Section 3 Specification Verification
22
General
22
Preparation
22
Procedure
22
Equipment
22
Table 3-1 Required Test and Calibration Equipment
22
Table 3-2 Frequency Accuracy
24
Table 3-3 Frequency Range
26
Table 3-4 VCF (Voltage Controlled Frequency)
27
Table 3-5 Main Output Amplitude
28
Table 3-6 DC Offset (Main Output)
29
Table 3-7 Sine Distortion
30
Table 3-8 Sine Frequency Response
32
Table 3-9 Squarewave Rise and Fall Time
33
Table 3-11 Ramp Time (121 Sweep Generator)
35
Table 3-12 Sweep Ramp
36
Table 3-13 Ramp Reset Time (121 Only)
37
Section 4 Theory of Operation
38
General
38
Fig. 4-1 Triangle Waveform
38
Fig. 4-2 Unsymmetrical Triangle (Ramp) Waveform
39
Circuit Description
40
Power Supply
40
Fig. 4-3 Diode Shaping Bridge
40
Summing Amplifier
41
Inverter
42
Positive and Negative Current Source
42
Variable Ramp/Pulse
42
Current Source Diode Switch
43
Buffer
43
Level Detector
43
TTL Gate
44
Squarewave Diode Switch
44
Sine Shaper
44
Sine Amplifier
45
Output Amplifier
45
Modulator (119M Only)
46
Sweep Generator (1 21 Only)
46
Section 5 Maintenance
48
Fuse Replacement
48
Disassembly for Calibration
48
Fig. 5-1 Retaining Screw Removal
48
Fig. 5-2 Top Cover- Mounting Tabs Removed from Rear Bezel
48
Disassembly for Parts Replacement
49
Calibration
49
Required Equipment
49
Preparation for Calibration
49
Fig. 5-3 Top Cover Removal
49
Fig. 5-4 Adjustment Locations
50
Procedure
51
Troubleshooting
53
Procedure
53
Table 5-1 Troubleshooting Procedure
55
Table 3-10 Pulse Output
57
Multiplier Alignment Procedure
58
Fig. 5-5 Removal of Multiplier Knob
59
Fig. 5-6 Alignment of Multiplier Knob
59
Fig. 6-6 Sweep Generator
59
Fig. 6-1 Block Diagram
61
Fig. 6-2 Component Layout
62
Fig. 6-4 Main Schematic
63
Fig. 6-3 Power Supply Schematic
65
Fig. 6-5 119M Modulator
66

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