VBT-75 S2
VACUUM BOTTLE TESTER
USER’S MANUAL
Vanguard Instruments Company, Inc.
1520 S. Hellman Ave.
Ontario, California 91761, USA
TEL: (909) 923-9390
FAX: (909) 923-9391
July 7, 2017
Revision 1
VBT-75 S2 USER’S MANUAL REV 1
SAFETY SUMMARY
FOLLOW EXACT OPERATING PROCEDURES
Any deviation from the procedures described in this operator’s manual may create one or more safety hazards,
damage the VBT-75 S2, or cause errors in the test results; Vanguard Instruments Co., Inc. assumes no liability for
unsafe or improper use of the VBT-75 S2. The following safety precautions must be observed during all phases of
test set up, test hookups, testing, and test-lead disconnects.
SAFETY WARNINGS AND CAUTIONS
This device shall be used only by trained operators. All circuit breakers under test shall be off line and fully
isolated.
SERVICE AND REPAIR
• Do not install substitute parts or perform any unauthorized modification to any VBT-75 S2 test unit.
• Repairs must be performed only by Vanguard Instruments Company factory personnel or by an authorized
repair service provider. Unauthorized modifications can cause safety hazards and will void the manufacturer’s
warranty.
EQUIPMENT RATINGS
IP Rating: The enclosure for the VBT-75 S2 has an IP rating of 32.
Pollution Degree: The VBT-75 S2 has a pollution rating of 2.
Operating Voltage: The VBT-75 S2 is rated for use with an operating voltage of 120V or 240V, auto-ranging ±10%
of selected voltage.
Power Cord: The VBT-75 S2 is supplied with a 16 AWG, 16A power cord with a NEMA 5-15P plug. Replacement
cable shall have the same or better rating and is available through the manufacturer.
VENTILATION REQUIREMENTS
The VBT-75 S2 must be operated with the enclosure lid open.
SAFETY SYMBOLS
OR
Indicates that caution should be exercised
Indicates location of chassis ground terminal
CLEANING
To clean the VBT-75 S2:
• Disconnect all cables and turn the unit off.
• Use a soft, lint-free cloth to wipe all surfaces clean.
• Avoid getting moisture in openings and connectors.
• Don't use any cleaning products or compressed air.
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REV 1 VBT-75 S2 USER’S MANUAL
TABLE OF CONTENTS
CONVENTIONS USED IN THIS DOCUMENT ....................................................................... 1
1.0 INTRODUCTION .................................................................................................................... 2
1.1 General Description and Features ................................................................................... 2
1.2 Technical Specifications ................................................................................................... 3
1.3 VBT-75 S2 Controls and Indicators .................................................................................. 4
2.0 CABLE CONNECTIONS .......................................................................................................... 6
3.0 OPERATING PROCEDURES ................................................................................................... 7
3.1 Set the Date and Time ..................................................................................................... 7
3.2 Changing the LCD Screen Contrast .................................................................................. 8
3.3 Performing a Test ............................................................................................................. 9
3.4 Updating Firmware ........................................................................................................ 11
LIST OF TABLES
Table 1. VBT-75 S2 Technical Specifications ................................................................................... 3
Table 2. Functional Descriptions of VBT-75 S2 Controls and Indicators ........................................ 5
LIST OF FIGURES
Figure 1. VBT-75 S2 Controls and Indicators .................................................................................. 4
Figure 2. VBT-75 S2 Connection Diagram ....................................................................................... 6
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VBT-75 S2 USER’S MANUAL REV 1
1.0 INTRODUCTION
1.1 General Description and Features
The VBT-75 S2 is Vanguard's second generation microprocessor-based, portable, 75kV dc
vacuum bottle tester. This lightweight, portable tester is designed for testing circuit-breaker
vacuum bottles in the field and at the shop.
Test voltages can be selected from 10 kV dc to 75 kV dc in 5 kV steps. The high-voltage test time
can be set from 5 seconds to 2 minutes. The test voltage is raised to the selected voltage and
held for the test time duration. The test voltage and leakage current are displayed on the LCD
during testing. After the test time duration has elapsed and the leakage current did not pass the
pre-set value of 100 µA, 200 µA, or 300 µA, the test voltage is returned to zero and a "Pass"
message is displayed. If a flash-over condition occurs, such as bottle failure, the test voltage is
immediately turned off, a “Failure” message is displayed on the LCD screen, and the “TEST FAIL”
LED light on the unit is also illuminated.
The presence of high voltage is indicated by an audible tone and an illuminated “HIGH
VOLTAGE” LED light. For additional operator safety, an “ARM” switch must be held down during
testing.
The VBT-75 S2 features a back-lit LCD screen (20 characters by 4 lines) that is viewable in both
bright sunlight and low-light levels. A turn-and-press knob is used to control the unit. The VBT75 S2's firmware can be updated in the field via the unit's built-in USB Flash drive port.
The VBT-75 S2 is furnished with a 10-foot test cable that is terminated with a quick-disconnect
test clip. A transportation case is also included.
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