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Summary of Contents for Vanguard Instruments II Series
- Page 1 OPERATING INSTRUCTIONS for the MODEL ATO-250™ 10-250 Amperes Digital Micro-Ohm Meter Series II ID Number VIC-25000-S2 Vanguard Instruments Company 1710 Grevillea Court Ontario, California 91761 TEL: 909/923-9390 JULY 2001 FAX: 909/923-9391 Rev 0...
- Page 2 Any deviation from procedures described in this operator’s manual may create one or more safety hazards, damage the ATO-250 or the device under test, or cause errors in the test results. Vanguard Instruments Company, Incorporated assumes no liability for unsafe or improper use of the ATO-250.
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Page 3: Table Of Contents
ATO-250™ Operating Procedures Table of Contents 1.0 Introduction ..........................1 2.0 Supersedure Notice ........................1 3.0 General Description ........................1 4.0 Furnished Test Accessories....................... 2 5.0 ATO-250 Specifications ......................2 6.0 Controls and Indicators ......................3 7.0 Preset Setup ..........................5 8.0 ATO-250 Printer Paper ...................... - Page 4 ATO-250™ Operating Procedures LIST OF FIGURE Figure 1.0 Controls and Indicators....................3 Figure 2.0 90 to 130Vac Jumper Setting ..................5 Figure 3.0 210 to 240Vac Jumper Setting ..................5 Figure 4.0 ATO-250 Cable Connection ..................6 Figure 5.0 Step-by-Step Operating Procedures ................7 Figure 6.0 Typical ATO-250 Test Report..................
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Page 5: Introduction
ATO-250™, identified by the part 3.1 Functional Description number VIC-25000-S2 manufactured by The fundamental operation of the ATO- Vanguard Instruments Company. A 250 is based upon the electrical relationship described by Ohm’s law: separate manual applies to the Series I, the first design configuration of the Model R=V/I. -
Page 6: Furnished Test Accessories
ATO-250™ Operating Procedures 4.0 Furnished Test Accessories A heavy duty shipping case is available as an accessory. The ATO-250 is supplied with a canvas bag, a power cord, a roll of 2.5-inch-wide 5.0 ATO-250 Specifications printer paper and one set of 35-foot test (Refer to the specification list in Table 1.0) cable with heavy-duty alligator clamps. -
Page 7: Controls And Indicators
ATO-250™ Operating Procedures 6.0 Controls and Indicators controls and the display may seem obvious (See Figure 1.0 and refer to Table2.0) and intuitive, users should become familiar with them before attempting to use the The controls and indicators of the ATO-250 ATO-250. -
Page 8: Table 2.0 Functional Description Of Controls And Indicators
ATO-250™ Operating Procedures Table 2.0 Functional Description of Controls and Indicators Fig. 1 Index # Adjacent Panel Marking Functional Description None (typical at 2 places) Red, voltage-sensing, input jacks. None (typical at 2 places) Red, test-current, output jacks. HIGH CURRENT Red, indicator LED. -
Page 9: Preset Setup
ATO-250™ Operating Procedures 7.0 Preset Setup 210-240 Vac, 50/60Hz. Voltage selection is 7.1 Operating Voltages set by jumpers on a terminal block as shown The ATO-250 operating voltages are in Table 3.0 and in Figures 2.0 and 3.0. selectable between 90-130 Vac, 50/60Hz or Table 3.0 Input Power Voltage Selections VOLTAGE SELECTION TERMINAL BLOCK JUMPERS... -
Page 10: Ato-250 Printer Paper
The ATO-250 is supplied with a set of 35 thermal paper for printing test results. foot test cable. Each cable consists of a Vanguard Instruments recommends that to current-carrying cable and a voltage-sensing maintain the highest quality printing and to cable. -
Page 11: Figure 5.0 Step-By-Step Operating Procedures
ATO-250™ Operating Procedures Figure 5.0 Step-by-Step Operating Procedures... -
Page 12: Operating Procedures
If the resistance of an inductive device and date must be also be correct before any is desired, Vanguard Instruments does test is performed. manufacture the WRM, an instrument designed for that purpose. - Page 13 ATO-250™ Operating Procedures A ten second counter will start counting f. Press the number one key (YES) if the test down when the user starts selecting the test result is to be printed. A typical test report current. The counter displays the remaining printout is shown in Figure 6.
- Page 14 ATO-250™ Operating Procedures i. If the user only wants to keep the current SAVE THIS RECORD test result in the working memory, press the 1. YES number two key (CLEAR PREV. DATA) 2. NO which then prompt the TEST SAVED acknowledgement.
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Page 15: Enter Test Information Procedure
ATO-250™ Operating Procedures Figure 6.0 Typical ATO-250 Test Report 12.0 Enter Test Information Procedure To fully document a test, the necessary identification must be entered before commencement of measurement. The test Press the key once to select the number “2.” identification will be stored with the resistance reading record inside the memory. -
Page 16: Restore Record Procedure
ATO-250™ Operating Procedures b. On the second SETUP menu, press the SERIAL NUMBER: number one key, ENTER ID. The next display will appear: h. Select the characters for the SERIAL NUMBER. Then press the ENTER key. COMPANY: The KVA RATING prompt will display: KVA RATING: c. - Page 17 ATO-250™ Operating Procedures b. To restore a record, press the number one RECORD ID INFO: key. RESTORE RECORD 1.ENTER RECORD NUMBER h. When the list scrolls to the record of 2.SCROLL TO SELECT interest shown on the above display, press the ENTER to display the date and time of c.
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Page 18: Review Record Procedure
ATO-250™ Operating Procedures 14.0 Review Record Procedure a. Press the number four key (NEXT PAGE) The user can review a test record residing in to display the following options menu: the working memory by using the following procedures. 1.COMPUTER CONTROL From the START-UP menu, press the 2.SET TIME number two key (SETUP) to display the... -
Page 19: Erase Record Procedure
ATO-250™ Operating Procedures a. On the SETUP menu, press the number three key (RESTORE RECORD), which will display the following menu: c. Press the one key to print a list of all the test records. 1.RESTORE RECORD 2.DIRECTORY d. Press the number two key to print the last ten records stored inside the memory. -
Page 20: Calibration Check Procedure
ATO-250™ Operating Procedures a. On the second SETUP menu, press the 17.0 Calibration Check procedure number three key (RESTORE RECORD), to Calibration check allows the user to verify display the menu: the electronics of the ATO-250 is working properly. All of the procedures start at the START-UP ERASE RECORD menu, shown below: 1. -
Page 21: Figure 8.0 Bus Bar Connection
ATO-250™ Operating Procedures e. If all of the functional checks do pass, the following test results will display in rapid succession: PLEASE TURN INPUT DRIVE TO ZERO ZERO PASS 100 AMPS f. Press the ENTER key to return the display to the START-UP menu. - Page 22 ATO-250™ Operating Procedures APPENDIX A ATO-250 Troubleshooting Guide Symptom Possible Problem Solution Reading is incorrect. 1. Poor connection at the 1.Check connection to make sure Clips. sensing and current teeth are 2. Broken sensing lead. touching the device under test (DUT).
- Page 23 ATO-250™ Operating Procedures APPENDIX B ATO-250 Cable Accessories Plastic Quick-Disconnect Clip, C-Clamp, Current Connector, and Sensing-Wire Connector C-Clamp Plastic Clip Sensing wire Connector Current Connector...
- Page 24 ATO-250™ Operating Procedures 1710 Grevillea Court, Ontario, CA 91761, USA Phone: 909-923-9390 Fax: 909-923-9391 Website: http//www.vanguard-instruments.com ATO-250 11/05/01: OAK...
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