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TONEOHM 850A
Polar Instruments TONEOHM 850A User Manual
60 pages
Manual
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2
Table of Contents
Declarations
5
Safety
6
Warning
6
Power Supply
7
Specifications
8
Environmental Operating Conditions
8
Symbols
9
Table of Contents
11
Section 1 - Introduction
14
Introduction to the Toneohm 850A
14
Using the TONEOHM 850A to Locate Short Circuits
14
TONEOHM 850A Applications
14
TONEOHM 850A Display Mechanisms
14
Section 2 - Description
16
Locating Short Circuits with the Toneohm 850A
16
TONEOHM 850A Shorts Locating Modes
16
Milliohmmeter
16
Track Voltage
16
Current Tracer
16
Controls, Connectors and Probes
16
Controls
16
RESISTANCE Range Switches
16
TRACK VOLTAGE Range Switches
17
DRIVE SOURCE Control
17
VOLUME Control
17
Audio Tone Output
17
Connectors
17
Headphone Socket
17
Current Trace Probe and Drive Source Leads
17
Needle Probes
18
Rear Panel Controls and Connectors
18
Mode and Range Selection
18
Section 3 - Installation and Set-Up
20
Preparation for Use
20
Unpacking
20
Connecting the TONEOHM 850A to a Power Supply
20
Section 4 - Milliohmmeter
22
Locating Solder and Land Bridges
22
Low Resistance) Shorts
22
Tracing Faults on Double Sided Boards
22
Section 5 - Track Voltage
24
Using Track Voltage to Locate Loading Faults
24
TRACK VOLTAGE Shorts Locating Mode
24
Static Faults
24
Excessive VCC Loads
24
Dynamic Faults
25
Section 6 - Current Tracing
28
Non-Contact Current Tracing
28
Using the 850A Drive Source
28
Connection and Sensitivity Adjustment
29
Operation
29
Board Sectoring
29
Bus Faults (Stuck Nodes)
30
Edge Connectors
32
Faulty Decoupling Capacitors
33
Section 7 - Simple Maintenance and Cleaning
34
Cleaning
34
Technical Support
34
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Polar Instruments TONEOHM 850A Specifications
General
Power Supply
100-240 VAC, 50/60 Hz
Accuracy
0.02%
Interfaces
RS-232, USB
Test Current
Up to 1A
Display
LCD