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HD-1250
Heathkit HD-1250 User Manual
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HEATHKIT
MANUAL
for
the
SOLID-STATE
DIP
METER
Model
HD-1250
COMPANY
•
BENTON
HARBOR.
MICHIGAN
2
Table of Contents
Warranty
2
Table of Contents
4
Introduction
4
Parts List
5
Resistors
5
Capacitor
6
Coils
7
Diodes
7
Metal Parts
8
Wire-Braid
9
Hardware
9
Plastic Parts
10
Miscellaneous
11
Printed Material
13
Battery
14
Step-By-Step Assembly
15
Assembly Notes
15
Safety Warning
15
Detector Circuit Board
16
Start
16
Continue
16
Circuit Board Checkout
18
Oscillator Circuit Board
19
Chassis
22
Top Panel
28
Initial Test
31
Osc Level
31
Oscillator Installation
33
Side Panel Assembly
36
Final Adjustment
37
Trimmer Adjustment
38
Calibration
39
Calibration Using a Known Signal
39
Calibration Using a Frequency Counter
40
Final Assembly
41
Carrying Case
42
Extension Probe
42
Injection Mode of Operation
44
Mode of Operation
44
Injection Mode Theory
46
Absorption Wave Meter Mode of Operation
47
Headphones
48
Log Scale
48
Absorption Mode Theory
48
Applications
49
Receiver Adjustment
49
Transmitter Adjustment
50
Shunt and Series Trap Adjustment
50
To Measure the Q of a Tuned Circuit
50
Relative Q
51
To Find an Unknown Capacitor Value
52
To Find the Inductive of RF Coils
53
To Find the Inductive of Toroid Coils
53
To Check for Parasitic Oscillations
53
Neutralization
54
Use as a Relative Field-Strength Meter
54
Antennas
55
Tuned Feeders
56
Untuned Feeders
57
Parasitic Beams
57
Shorted Quarter-Wave Lines
58
Open Quarter-Wave Lines
58
Shorted Half-Wave Lines
58
Open Half-Wave Lines
59
Standing Waves
59
In Case of Difficulty
60
Visual Tests
60
Precautions for Troubleshooting
60
Silicon Bipolar Transistor Checking
61
MOSFET Checking
61
Troubleshooting Chart
62
Specifications
64
Circuit Description
65
Detector
65
Oscillator
65
Circuit Board X-Ray Views
66
Circuit Board Voltage Charts
67
Diode-Transistor Identification Chart
68
Schematic
69
Replacement Parts
71
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Heathkit HD-1250 Specifications
General
Type
Digital Frequency Counter
Weight
5 lbs
Power Source
AC mains
Input Impedance
1 MOhm
Accuracy
±1 count
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