Vanguard Instruments ATRT-03 User manual

OPERATING INSTRUCTIONS
for
Models ATRT-03, ATRT-03A and ATRT-03B
Three-Phase Transformer Turns-Ratio Meter
Vanguard Instruments Co., Inc.
1710 Grevillea Court
Ontario, California 91761
TEL: [phone] August 2002
FAX: [phone] REV. 02
I-917

Model ATRT-03 (v) Operating Instruction
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Model ATRT-03 (v) Operating Instruction
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NOTICE
This manual applies to models ATRT-03, ATRT-03A and the ATRT-03B. The operating
procedures are virtually the same for all models; any differences, which relate to the test unit’s
power sources, are clearly described within the step-by-step procedures.
SAFETY WARNINGS AND CAUTIONS
This device shall be used only by trained operators.
All transformers under test shall be off line and fully isolated.
Do Not Service or Test Alone
Do not perform test procedures or service unless another person is also present who is capable of
rendering aid and resuscitation.
Do Not Modify Test Equipment
Due to the added risk of introducing additional or unknown hazards, do not install substitute parts
or perform any unauthorized modification to any model ATRT-03 test unit. To ensure that all
designed safety features are maintained, it is recommended that repairs be performed only by
Vanguard Instruments Co. factory personnel or by an authorized repair service. Unauthorized
modifications can cause serious safety hazards and will nullify the manufacturer's warranty.
Follow Exact Operating Procedures
Any deviation from procedures described in this operator’s manual may create one or more safety
hazards, damage the ATRT-03 or the test transformer, or cause errors in the test results. Vanguard
Instruments Co., Inc. assumes no liability for unsafe or improper use of the ATRT-03.

Model ATRT-03 (v) Operating Instruction
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Table of Content
1.0 Introduction................................................................................................................................. 7
2.0 Applicability ............................................................................................................................... 7
3.0 ATRT-03/03A/03B Description ................................................................................................. 7
4.0 Principle of Operation................................................................................................................. 8
5.0 Specifications.............................................................................................................................. 9
5-1. ATRT-03/03A/03B Supplied Cables ................................................................................... 10
6.0 Cable Marking and Identification .............................................................................................10
7.0 ATRT-03/03A/03B Front Panel Descriptions .......................................................................... 11
7-1. ATRT-03 Operating Controls and Indicators....................................................................... 11
7-2. ATRT-03A Operating Controls and Indicators.................................................................... 13
7-3. ATRT-03B Operating Controls and Indicators .................................................................... 15
8.0 ATRT-03/03A Printer and Printer Paper .................................................................................. 17
9.0 ATRT-03/03A/03B Storage Capabilities.................................................................................. 17
9-1. ATRT-03/03A/03B Test Record Storage Capabilities......................................................... 17
9-2. ATRT-03/03A/03B Transformer Test Plan Storage Capabilities ........................................ 17
10.0 ATRT-03/03A/03B Operating Voltages............................................................................... 17
10-1. ATRT-03/03B Operating Voltages .................................................................................... 17
10-2. ATRT-03A Operating Voltages ......................................................................................... 18
11.0 ATRT-03/03A/03B Special Features.................................................................................... 18
11-1. ATRT-03/03A/03B LCD Contrast Control........................................................................ 18
11-2. ATRT-03/03B Test Voltages ............................................................................................. 18
11-3. ATRT-03/03A/03B RS-232C Computer-Control Port ...................................................... 18
12.0 Windows-Based PC Transformer Analysis Software........................................................... 18
13.0 ATRT-03 Cable Hook Up..................................................................................................... 18
13-1. ATRT-03/03A/03B Ground Cable ..................................................................................... 18
13-2. ATRT-03/03A/03B Test Leads .......................................................................................... 18
13-3. Typical Transformer Connection to ATRT-03/03A/03B................................................... 19
14.0 Single-Phase Transformer Test Procedure ........................................................................... 25
14-1. Start-Up Menu .................................................................................................................... 27
14-2. Test Transformer Selection Menu ...................................................................................... 28
14-3. Transformer Test Procedure Menu..................................................................................... 29
14-4. Transformer Voltage Name Plate Menu............................................................................. 30
14-5. Transformer Voltage Data Entry Menu.............................................................................. 31
14-6. Start Test Menu .................................................................................................................. 33
14-7. Transformer Turns-Ratio Test Result Display ................................................................... 34
14-8. Print Transformer Test Results Menu ................................................................................ 35
14-9. Print Transformer Test Results Format Menu.................................................................... 36
14-10. ATRT-03/03A Test Result Print Out In Column Format................................................. 37
14-11. ATRT-03/03A Test Result Print Out In Detail Format.................................................... 38
14-12. Keep Transformer Ratio Reading Menu .......................................................................... 39
14-13. Append This Reading Menu............................................................................................. 40
14-14. Repeat Test Menu............................................................................................................. 41
14-15. Save Test Record Menu.................................................................................................... 42
14-16. Record Storage Confirmation Menu ................................................................................ 43

Model ATRT-03 (v) Operating Instruction
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15.0 Three-Phase Transformer Test Procedure Using Nameplate Voltages ................................ 44
15-1. Print Out of a Delta-to-Wye Transformer Test in Column Format .................................. 46
16.0 Running a Special Transformer Test .................................................................................... 47
16-1. Special Transformer Test Print Out.................................................................................... 49
17.0 Printing Test Record Directory............................................................................................. 50
17-2. Print Test Record Directory Menu ..................................................................................... 51
17-3 Test Record Directory Print Out.......................................................................................... 52
18.0 Restoring a Test Record to Thermal Printer. ........................................................................ 53
18-1. Test Record Menu .............................................................................................................. 54
18-2. Restore Test Record Menu .................................................................................................55
18-3. Restore Test Record Using Record Number ...................................................................... 56
18-4. Print /Scroll a Test Record Menu ....................................................................................... 57
19.0 Restore a Test Record to LCD.............................................................................................. 58
19-1. Scroll Test Record Menu:................................................................................................... 59
20.0 Print a Test Plan in Memory.................................................................................................61
20-1. Printing Test Plan Menu 1.................................................................................................. 62
20-2. Printing Test Plan Menu 2.................................................................................................. 63
20-3. Printing Test Plan Menu 3.................................................................................................. 64
20-4. Typical Single Phase Voltage Regulator Test Plan Print Out ............................................ 65
20-5. Typical Three Phase Load Tap Changer Test Plan Print Out ............................................ 66
20-6. Typical Wye to Delta Test Plan Print Out.......................................................................... 67
21.0 Load a Test Plan From Memory........................................................................................... 68
21-1. Load Test Plan Menu.......................................................................................................... 69
22.0 Test a Transformer Using a Test Plan. ................................................................................. 70
22-1. Test Plan Identification Menu ............................................................................................72
22-2. Test Plan Loaded in Memory Menu................................................................................... 73
22-3. Test Result Display Using Test Plan .................................................................................. 74
22-4. Test Result Print Out Using Test Plan................................................................................ 75
23.0 Change ATRT-03/03A/03B Real Time Clock ..................................................................... 76
23-1. Set Real Time Clock Setup Menu ...................................................................................... 76
23-2. Set Time and Date .............................................................................................................. 77
24.0 Enable Computer Interface ...................................................................................................78
24-1. ATRT-03/03A/03B Computer Interface Menu .................................................................. 79
25.0 Entering Transformer Identification for Test Record Menu................................................. 80
26.0 ATRT-03/03B Test Voltage Selections................................................................................ 82
26-1. Test Voltage Selection........................................................................................................ 83
27.0 ATRT-03/03A/03B Cable Test............................................................................................. 84
28.0 ATRT-03/03A/03B Verification Test................................................................................... 85

Model ATRT-03 (v) Operating Instruction
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List of Tables
Table 5-0. Model ATRT-03/03A/03B Turns-Ratio Meter Specifications ........................................ 9
Table 5-1. ATRT-03/3A/3B Cable Set ............................................................................................. 10
Table 6-1. Cable Markings and Identification .................................................................................. 10
Table 7-1. Model ATRT-03 Front-Panel Controls, Indicators, and Connectors ............................. 12
Table 7-2. Model ATRT-03A Front-Panel Controls, Indicators, and Connectors .......................... 14
Table 7-3. Model ATRT-03B Front-Panel Controls, Indicators, and Connectors ........................... 16
Table 10-1. Voltage-Selection Jumper Pins .................................................................................... 17
Table 14-0. Single-Phase Transformer Test Procedure Steps ......................................................... 25
Table 14-0. Single-Phase Transformer Test Procedure Steps (cont.).............................................. 26
Table 15-1. Three-Phase Transformer Test Procedure Steps .......................................................... 44
Table 15-1. Three-Phase Transformer Test Procedure Steps (cont.)............................................... 45
Table 16-1. Three-Phase Transformer Test Procedure Steps .......................................................... 47
Table 16-1. Three-Phase Transformer Test Procedure Steps (cont.)............................................... 48
Table 17-1. Print Test Record Directory ......................................................................................... 50
Table 18-1. Restoring a Test Record to Thermal Printer................................................................. 53
Table 19-1. Restoring a Test Record to LCD .................................................................................. 58
Table 20-1. Print A Test Plan from ATRT-03/03A Memory .......................................................... 61
Table 21-1. Load A Test Plan from ATRT-03/03A/03B Memory.................................................. 68
Table 22-1. Test a Transformer Using a Test Plan .......................................................................... 70
Table 22-1. Test a Transformer Using a Test Plan (cont.) .............................................................. 71
Table 23-1. Change ATRT-03/03A/03B Real Time Clock............................................................. 76
Table 24-1. Change ATRT-03/03A/03B Real Time Clock............................................................. 78
Table 25-1. Enter Transformer Identification for Test Record......................................................... 80
Table 25-1. Enter Transformer Identification for Test Record (cont.) ............................................. 81
Table 26-1. Select Test Voltages ..................................................................................................... 82
Table 27-1. ATRT-03/03A/03B Cable Diagnostic.......................................................................... 84
Table 28-1. ATRT-03/03A/03B Verification Test .......................................................................... 85

Model ATRT-03 (v) Operating Instruction
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List of Figures
Figure 7-1. Model ATRT-03 Front-Panel Controls, Indicators, and Connectors............................ 11
Figure 7-2. Model ATRT-03A Front-Panel Controls, Indicators, and Connectors......................... 13
Figure 7-3. Model ATRT-03B Front-Panel Controls, Indicators, and Connectors ......................... 15
Figure 13A. Typical Connection for Single-Phase Transformer...................................................... 19
Figure 13B. Typical Connection for Single-Phase Auto Transformer ............................................. 19
Figure 13C. Typical Connection for Type A Voltage Regulator ..................................................... 20
Figure 13D. Typical Connection for Type B Voltage Regulator ..................................................... 20
Figure 13E. Typical Connection for Donut Type (un-mounted) CT................................................ 21
Figure 13F. Typical Connection for Multi-tap CT ........................................................................... 21
Figure 13G. Typical Connection for Bushing-Mount-CT ................................................................ 22
Figure 13H. Typical Connection for Bushing Mount CTs on Delta Transformer ........................... 23
Figure 13I. Typical Connection for Bushing Mount CTs on Wye Transformer .............................. 24
Figure 14-1. Start-up Menu .............................................................................................................. 27
Figure 14-2. Transformer Selection Menu ....................................................................................... 28
Figure 14-3. Transformer Test Procedure Menu .............................................................................. 29
Figure 14-4. Nameplate Voltage Selection Menu ........................................................................... 30
Figure 14-4A. Nameplate Voltage Selection Menu......................................................................... 30
Figure 14-5A. H-Winding Voltage Entry Display #1....................................................................... 31
Figure 14-5B. H-Winding Voltage Entry Display #2....................................................................... 31
Figure 14-5C. X-Winding Voltage Entry Display #1....................................................................... 31
Figure 14-5D. X-Winding Voltage Entry Display #2....................................................................... 31
Figure 14-6. Start Test Menu........................................................................................................... 33
Figure 14-7. Test Result Display ...................................................................................................... 34
Figure 14-8. Print Transformer Test Results Menu......................................................................... 35
Figure 14-9. Print Transformer Test Results Format Menu ............................................................ 36
Figure 14-10. Column Format Printout ...........................................................................................37
Figure 14-11. Detail Format Printout ............................................................................................... 38
Figure 14-12. Keep Transformer Ratio Reading Menu................................................................... 39
Figure 14-13. Append Transformer Ratio Reading Menu............................................................... 40
Figure 14-14. Repeat Test Menu ..................................................................................................... 41
Figure 14-15. Print Transformer Test Results Menu....................................................................... 42
Figure 14-16. Record Storage Confirmation Menu ......................................................................... 43
Figure 15-1. Delta-to-Wye Column Format Printout ....................................................................... 46
Figure 16-1. Special Dy11Transformer Test Print Out .................................................................... 49
Figure 17-1. Select Test Record Directory Menu............................................................................ 50
Figure 17-2. Print Directory Menu .................................................................................................. 51
Figure 17-3. Test Record Directory Print Out .................................................................................. 52
Figure 18-1. Test Record Menu....................................................................................................... 54
Figure 18-2. Restore Test Record Menu..........................................................................................55
Figure 18-3. Restore Test Record Menu #2...................................................................................... 56
Figure 18-4. Print or Scroll Through Test Record........................................................................... 57
Figure 19-1A. Scroll Test Record LCD Display First Screen .......................................................... 59
Figure 19-1B. Scroll Test Record LCD Display Second Screen...................................................... 59
Figure 19-1C. Scroll Test Record LCD Display Third Screen........................................................ 60
Figure 20-1. Test Plan Menu 1 ........................................................................................................ 62

Model ATRT-03 (v) Operating Instruction
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Figure 20-2. Print Test Plan Menu 2................................................................................................ 63
Figure 20-3. Test Record Menu....................................................................................................... 64
Figure 20-3A. Typical Test Plan Header ..........................................................................................64
Figure 20-4. Typical Single Phase Voltage Regulator Print Out...................................................... 65
Figure 20-5. Typical Three Phase Load Tap Changer Test Plan Print Out ...................................... 66
Figure 20-6. Typical Wye to Delta Test Plan Print Out ................................................................... 67
Figure 21-1. Test Record Menu....................................................................................................... 69
Figure 21-1A . Typical Test Plan Header .........................................................................................69
Figure 22-1. Test Plan Identification Menu.....................................................................................72
Figure 22-2. Test Plan Loaded in Memory Menu ........................................................................... 73
Figure 22-3. Test Result Display with Test Plan ............................................................................. 74
Figure 22-4. Test Result Print Out of a Single Phase Transformer Test Using Test Plan................ 75
Figure 23-1. ATRT-03/03A/03B Setup Menu.................................................................................. 76
Figure 23-2. Time and Date Display ............................................................................................... 77
Figure 24-2. Select Computer Interface Display ............................................................................ 79
Figure 26-1. Select Test Voltage menus.......................................................................................... 83

Model ATRT-03 (v) Operating Instruction
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1.0 Introduction
The model ATRT-03/03A/03B is a microprocessor-based, three-phase, field-portable,
automatic, transformer turns-ratio test meter. The ATRT-03/03A/03B is designed for on-site
measuring of: turns ratios, winding polarity and no-load excitation currents of single phase, three-
phase utility transformers, potential transformers (PTs) and primary current transformers (CTs).
The ATRT-03/03A/03B can be used in the stand-alone or computer control mode. Under computer
control, the user can control the ATRT-03/03A/03B via the RS-232C port with an IBM PC. The
ATRT-03/03A/03B is supplied with single and three-phase hook-up (H & X) cables. Three phase
transformers are tested without changing test leads for each phase tested.
2.0 Applicability
The ATRT-03/03A/03B is available in three models:
a. The ATRT-03 is a line-powered, 120/240 Vac (selectable), 50/60 Hz unit.
b. The ATRT-03A can be powered by 120-240 Vac, or 80-300 Vdc, or 12 Vdc.
c. The ATRT-03B is a line-powered 120/240 Vac (selectable), 50/60 Hz unit without built-
in printer.
3.0 ATRT-03/03A/03B Description
The ATRT-03/03A/03B measures a transformer ratio by applying a test voltage across the primary
(H) winding and then senses the induced voltage on the secondary (X) side. Since there is no load
on the windings during a test, the measured voltage ratio is virtually the same as the winding turns
ratio. Besides measures winding ratios, winding polarity and excitation current (in milliamperes),
the ATRT-03/03A/03B also has the following features:
 The ATRT-03/03A/03B allows users to enter nameplate voltages for specified turns-ratio
calculation. Besides calculating the turns-ratio, the ATRT-03/03A/03B also calculates the
percentage of errorbased upon the difference between the calculated and measured ratio values.
 The ATRT-03/03A/03B allows users to save transformer test records within the FLASH
EEPROM. A typical test record consists of 99 readings of H and X nameplate voltages, phase
A/B/C turns ratios, excitation current and phase angle. Up to 200 records can be stored in the
ATRT-03/03A/03B memory. Stored records can be recalled, printed or transferred to an IBM PC.
 The ATRT-03/03A/03B has the capability to store 128 Transformer Test Plans within the
FLASH EEPROM. A test plan allows the user to store transformer nameplate voltages. Using the
nameplate voltages during a test, the ATRT-03/03A/03B can print “PASS” or “FAIL” results on
each of the transformer tests.
 A built-in 4.5-inch wide thermal printer (not available with ATRT-03B) allows the user
to print test reports in the field. A 16-key, alpha-numeric keypad allows the user to control and
enter transformer test data.
 A built-in RS-232C port allows the ATRT-03/03A/03B to interface with an IBM
compatible PC. A Windows-based transformer-testing software, supplied with each ATRT-
03/03A/03B, allows users to retrieve test records, create test plans or remotely control the ATRT-
03/03A/03B. Under the computer control mode, users can run a transformer test and save the test

Model ATRT-03 (v) Operating Instruction
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results directly to the PC. Since data is stored in ASCII format, the test results can be imported into
any database desired.
4.0 Principle of Operation
Before any tests are performed, the ATRT-03/03A/03B checks test-lead hook-ups for error. The
ATRT-03/03A/03B applies a low-level test voltage (300 mV) across the winding being tested and
senses the induced secondary voltages. When an induced voltage is greater than the applied
excitation voltage the test unit detects a hookup error. For safety reasons, testing is always done in
a step-down transfer manner. If a connection error is detected, the ATRT-03/03A/03B aborts the
test and displays, “Hook-Up Error.” If no hookup error is detected, the ATRT-03/03A/03B applies
a full test voltage to the transformer being tested and the winding (voltage) ratio is displayed.
The ATRT-03/03A/03B measures turns-ratios ranging from 0.8 to 15,000. Excitation current (via
H leads) is measured for reference and ranges from 0.0 to 2,000 mA. Winding polarity is displayed
as +/- signs and measured in degrees with ±0.2 degree resolution. Phase angle measurement is
printed in detail format only (see 14-11). The ATRT-03/03A/03B calibrates its own sensing circuits
before each test. Therefore, adjustment by the operator is not required.

Model ATRT-03 (v) Operating Instruction
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5.0 Specifications
Model ATRT-03/03A/03B specifications are listed in Table 5-0.
Table 5-0. Model ATRT-03/03A/03B Turns-Ratio Meter Specifications
(Unless otherwise indicated, each specification is the same for all three ATRT-03 models.)
Type Portable, Automatic, Three-Phase Transformer Turns-Ratio Meter
Size (inches) 17 L by 13 W by 7 H
Weight (pounds) 17
Input Voltage ATRT-03/03B: 120/240 Vac (Selectable)
ATRT-03A: 85 to 264 Vac, 110 to 370 Vdc, 12Vdc (car battery)
Turns Ratio-Measuring Ranges 0.800 to 15,000.00
Turns-Ratio Accuracy 0.8-999: ±0.1 %
1,000-1,499: ±0.2 %
1,500-1,999: ±1.0 %
2,000-15,000: ±2.0 %
Calibration Self Calibrating; No operator calibration required.
Excitation Voltage ATRT-03/03B: 8 Vac, 40 Vac, 100 Vac (Selectable)
ATRT-03A: 20 Vac
Excitation Current ATRT-03/03B: 0 to 2 amp; ATRT-03A: 0 to 200 milliamperes
Current Accuracy ±1mA (±1 Digit)
Phase Angle 0 to 360 degree
Phase Angle Accuracy ±0.2 degree Reading (±1 Digit)
Winding Polarity Displayed on an LCD screen
Display LCD: 20 Characters wide by 4 Lines, viewable in bright sunlight
Serial Interface RS-232C, 19200 baud, 8 data bits, 2 start bits, 1 stop bit
Temperature •Operating: -20 °C to 55 °C•Storage: -40 °C to 65 °C
Warranty One-Year on Parts and Labor
Note: All Specifications here in are valid at nominal voltage and ambient temperature of +25ºC (+77ºF).
Specifications are subject to change without notice.

Model ATRT-03 (v) Operating Instruction
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5-1. ATRT-03/03A/03B Supplied Cables
Table 5-1. ATRT-03/3A/3B Cable Set
Item Description Qty
1 H Test-Lead Cable, 15-foot
Single-Phase Cables
1
2 X Test-Lead Cable, 15-foot
Single-Phase Cables
1
3 H Test-Lead Cable, 15-foot
Three-Phase Cables
1
4 X Test-Lead Cable, 15-foot
Three-Phase Cables
1
5H Extension Cable, 25-foot
Three-Phase Cables
1
6X Extension Cable, 25-foot
Three-Phase Cables
1
7Power cord 1
8DC power cord (Note) 1
9Ground Cable 1
Note:
1. A canvas cable-carrying bag is included with the cable set.
2. DC power cord is supplied with the ATRT-03A only.
6.0 Cable Marking and Identification
Both H and X cable test leads are terminated with heavy-duty battery clips. Test cables are
identified as follows:
Table 6-1. Cable Markings and Identification
Test Cable Name Transformer Terminals Clip Color Identification
Single Phase H Cables HRed H1, H2
Single Phase X Cables XBlack X1, X2
Three Phase H Cables HRed H0, H1, H2, H3
Three Phase X Cables XBlack X0, X1, X2, X3

Model ATRT-03 (v) Operating Instruction
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7.0 ATRT-03/03A/03B Front Panel Descriptions
7-1. ATRT-03 Operating Controls and Indicators
Figure 7-1. Model ATRT-03 Front-Panel Controls, Indicators, and Connectors

Model ATRT-03 (v) Operating Instruction
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Table 7-1. Model ATRT-03 Front-Panel Controls, Indicators, and Connectors
Fig. 7-1 Index Panel Markings Functional Description
1EMERGENCY
TURN OFF
“PUSH”
Emergency turn-off test voltage switch.
2HH Voltage Test Connector.
3None (Display) LCD screen: 4 line by 20 character, back-lighted
and legible in the sunlight. Displays menus, test
results and status readouts.
4XX Voltage Test Connector.
5120/240 Vac, 1A,
50/60Hz
Fuse: 250Vac
,
2A
Input power connector and fused power switch
with third-wire safety ground.
6None (Wing nut) ATRT-03 ground stud. Connect the ground stud
to substation ground.
7None (Printer) Thermal printer, 4.5-inch wide.
8None (Keypad) Pushbutton operating controls, 16-keys.
9TEST IN PROGRESS Red LED, Test In Progress. This LED flashes
when the ATRT-03 responds to a command or
when test voltage is applied to the test
transformer. The ATRT-03 flashes the LED and
beeps at a one second rate during tests.
10 RS-232C Computer-Interface Port, 9-pin, female DB type
connector. RS-232C interface allows the
ATRT-03 to interface with an IBM PC
computer. Data rate is set to 19,200 baud, 1 start
bit, 8 data bits, 2 stop bits, and no parity bit.
Connector pin functions are:
PIN SIGNAL
2 Rx
3 Tx
5 Gnd

Model ATRT-03 (v) Operating Instruction
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7-2. ATRT-03A Operating Controls and Indicators
Figure 7-2. Model ATRT-03A Front-Panel Controls, Indicators, and Connectors

Model ATRT-03 (v) Operating Instruction
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Table 7-2. Model ATRT-03A Front-Panel Controls, Indicators, and Connectors
Fig. 7-2 Index Panel Markings Functional Description
1EMERGENCY
TURN OFF
“PUSH”
Emergency turn off test voltage switch.
2HH Voltage Test Connector.
3XX Voltage Test Connector.
4None (display) LCD screen: 4 line by 20 character, back-lighted
and legible in the sunlight. Displays menus, test
results and status readouts.
512 VDC 12 VDC input connector. A 10-foot cigarette-
lighter adapter power cord will be provided with
the ATRT-03A.
6POWER Power Switch.
7120/240Vac, 1A, 50/
60Hz Fuse: 250Vac,
2A, Fast Blow
Input power connector and fused power switch
with third-wire safety ground.
8None ( Wing nut) ATRT-03A ground stud. Connect this ground
stud to substation ground.
9None (Printer) Thermal printer, 4.5-inch wide printout.
10 None (Keypad) Pushbutton operating controls, 16-keys.
11 TEST IN PROGRESS Red LED, Test In Progress. This LED flashes
when the ATRT-03 responds to a command or
when test voltage is applied to the test
transformer. The ATRT-03 flashes the LED and
beeps at a one second rate during tests.
12 RS-232C Computer-interface port, 9-pin, female DB type
connector; RS-232C interface port allows the
ATRT-03A to interface with an IBM PC
computer. Data rate is set to 19,200 baud, 1 start
bit, 8 data bits, 2 stop bits, and no parity bit.
Connector pin functions are:
PIN SIGNAL
2 Rx
3 Tx
5 Gnd

Model ATRT-03 (v) Operating Instruction
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7-3. ATRT-03B Operating Controls and Indicators
Figure 7-3. Model ATRT-03B Front-Panel Controls, Indicators, and Connectors

Model ATRT-03 (v) Operating Instruction
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Table 7-3. Model ATRT-03B Front-Panel Controls, Indicators, and Connectors
Fig. 7-3 Index Panel Markings Functional Description
1None (Display) LCD screen: 4 line by 20 character, back-lighted
and legible in the sunlight. Displays menus, test
results and status readouts.
2HH Voltage Test Connector.
3XX Voltage Test Connector.
4
5120/240Vac, 1A, 50/
60Hz; Fuse: 250Vac,
2A, Fast Blow
Input power connector and fused power switch
with third-wire safety ground.
6None (Wing nut) ATRT-03B ground stud. Connect this ground
stud to substation ground.
7EMERGENCY
TURN OFF
“PUSH”
Emergency turn off test voltage switch.
8None (Keypad) Pushbutton operating controls, 16-keys.
9RS-232C Computer-interface port, 9-pin, female DB type
connector; RS-232C interface port allows the
ATRT-03B to interface with an IBM PC
computer. Data rate is set to 19,200 baud, 1 start
bit, 8 data bits, 2 stop bits, and no parity bit.
Connector pin functions are:
PIN SIGNAL
2 Rx
3 Tx
5 Gnd

Model ATRT-03 (v) Operating Instruction
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8.0 ATRT-03/03A Printer and Printer Paper
The ATRT-03/03A consists of a built-in thermal printer which uses 4.5-inch wide thermal paper
for printing test results. To maintain the highest quality test-result printing and to avoid paper
jamming, the use of paper supplied by our factory is highly recommended. Additional paper can be
ordered from either of the two sources listed below:
Vanguard Instruments Co, Inc.
1710 Grevillea Court
Ontario, CA 91761
Tel: [phone]
Fax: [phone]
Part Number: TP-4 Paper
OR
BG Instrument Co.
13607 E. Trent Ave.
Spokane, WA 99216
Tel: [phone]
Fax: [phone]
Part Number: TP-4 paper
9.0 ATRT-03/03A/03B Storage Capabilities
9-1. ATRT-03/03A/03B Test Record Storage Capabilities
The ATRT-03/03A/03B is capable of storing up to 200 transformer test records. These test records
are stored in the FLASH EEPROM. Users can retrieve these records from the FLASH EEPROM
to be either printed by the thermal printer or transferred to a PC.
9-2. ATRT-03/03A/03B Transformer Test Plan Storage Capabilities
Each ATRT-03/03A/03B is capable of storing up to 128 Transformer Test Plans in the FLASH
EEPROM. A test plan allows the user to run a complete transformer test to obtain PASS or FAIL
results.
10.0 ATRT-03/03A/03B Operating Voltages
10-1. ATRT-03/03B Operating Voltages
The ATRT-03 and ATRT-03B operating voltages are selectable between 110/220 V, 50/60 Hz or
220/240, 50/60 Hz. Voltage selection is set by the reference transformer jumpers as shown in Table
10-1.
Table 10-1. Voltage-Selection Jumper Pins
VOLTAGE SELCTION TRANSFORMER
110/220 Vac Pin 1 & 2, 3 & 4
220/240 Vac Pin 2 & 3
Note:
Operating voltage is preset from the factory.

Model ATRT-03 (v) Operating Instruction
18
10-2. ATRT-03A Operating Voltages
The ATRT-03A utilizes a special switching power supply, where the input AC receptacle voltage
can range from 90-240 Vac or 80-300 Vdc. The DC power plug will accept 12 Vdc from a battery.
A DC power cable with a cigarette-lighter plug is provided with each ATRT-03A.
11.0 ATRT-03/03A/03B Special Features
11-1. ATRT-03/03A/03B LCD Contrast Control
To darken the LCD screen, press and hold the “↑Contrast” button for two seconds. To lighten the
LCD screen, press and hold the “↓Contrast” button for two seconds.
11-2. ATRT-03/03B Test Voltages
The ATRT-03 and ATRT-03B have 3 selectable test voltages: 8 Vac, 40 Vac, and 100 Vac. The
ATRT-03A uses 20 Vac for test voltage. Refer to paragraph 26.0 for test voltage selection.
11-3. ATRT-03/03A/03B RS-232C Computer-Control Port
The ATRT-3/03A/03B can be controlled remotely via an RS-232C port. The ATRT-03/03A/03B
computer control must be enabled before it can be controlled via the RS-232C port. Refer to
section 24.0 for procedures to enable the computer interface control.
12.0 Windows-Based PC Transformer Analysis Software
Windows-Based PC Transformer Analysis Software is delivered with each ATRT-03/03A/03B.
This software allows the user to retrieve test reports (stored in the ATRT-03/03A/03B), download
test plan (to ATRT-03/03A/03B) or control the ATRT-03/03A/03B via a PC. When the
ATRT-03/03 is under computer control mode, users can run a transformer test and save the test
results directly on a PC. Since data are stored in ASCII format, test results can be imported into
any database desired.
13.0 ATRT-03 Cable Hook Up
13-1. ATRT-03/03A/03B Ground Cable
Always ground the ATRT-03/03A/03B before connecting H and X cables. Use the ground cable
provided with the cable set.
13-2. ATRT-03/03A/03B Test Leads
Ground transformer bushings before connecting test leads to transformer. This procedure
eliminates any induced voltages into the ATRT-03/03A/03B.
NOTE:
All transformer leads must be removed and the transformer must be isolated before performing any
test.