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M

AVTMMTO3xx Rev 3 Sept 2013

42

M

Table of Contents

Table of Contents5
MTO300 Transformer Ohmmeter Test Set7
MTO330 Transformer Ohmmeter Test Set7
Getting to Know the MTO9
Product Overview 300/3309
Top Panel Controls10
Figure 1: MTO300 Front Panel10
Figure 2: MTO330 Front Panel10
Figure 3. HOME Action Icons14
Safety15
Safety Is the Responsibility of the User15
General Safety Precautions16
Input Power Precautions17
PC Interface Precautions18
Preparing for a Test19
Site Preparation19
Making Circuit Connections19
Operating the MTO300/33021
Description of Test Sequence21
Transformer Testing27
Winding Resistance Testing27
Testing a Single-Phase Transformer28
Figure 4: Single Winding Measurement Primary or Secondary28
Figure 5: Dual Winding Measurement (Primary and Secondary)29
Figure 6: YN Reading Sequence40
Figure 7: y Reading Sequence41
Figure 8: Delta Reading Sequence42
Testing Delta Configured Windings43
Demagnetizing a Transformer45
MTO330/300 Series Powerdb Lite51
Introduction51
Software Installation52
Using Powerdb Lite55
Using Powerdb Onboard (MTO330 Only)61
Service63
Maintenance63
Fuse Replacement63
Calibration64
Repairs65
Error Codes66

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