OPERATING INSTRUCTIONS for the AUTO-OHM LOW-RESISTANCE OHMMETER Series II Part Number VIC-60000-S2 Vanguard Instrumentss Company 1710 Grevillea Court Ontario, California 91761 TEL: (909) 923-9390 FAX: (909) 923-9391 April 2001 Rev.
Auto-Ohm Operating Procedures SAFETY SUMMARY The following safety precautions must be observed during all phases of test set-up, test hookups, testing, and test-lead disconnects. may seem, never assume anything about the safety of any test setup. Ensure the safety of personal by checking first-hand to eliminate all possible hazards! 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.
Auto-Ohm Operating Procedures Table of Contents Safety Summary............................................................................................................................... i Table of Contents............................................................................................................................ ii 1.0 Introduction...............................................................................................................................1 1.1 Applicability ............
Auto-Ohm Operating Procedures 1.0 INTRODUCTION 1.1 Applicability This manual applies to Series II of the Model Auto-Ohm™ (hereafter, Auto-Ohm), identified by Part Number VIC-60000-S2 made by Vanguard Instruments Company. A separate manual applies to Series I (the first design configuration) of the Auto-Ohm. 1.2 Supersedure Notice This Operator’s manual is the basic issue for Series II Auto-Ohm and does not supersede any previously published manual. 1.
Auto-Ohm Operating Procedures 2.0 AUTO-OHM SPECIFICATIONS Auto-Ohm specifications and leading particulars are listed in Table 1 . Table 1. Auto-Ohm Specifications and Leading Particulars MODEL ...................... Auto-Ohm PART NUMBER .......... VIC-60000-S2 TYPE ............................. Special-Purpose Test Equipment, Portable, Low Resistance-Ohmmeter CONFIGURATION...... Second-generation (improved design, superseding original model) SIZE (inches) .............. 16.8 Wide by 12.6 High by 10.
Auto-Ohm Operating Procedures 3.0 CONTROLS and DISPLAYS (See Figure 1 and refer to Table 2.) The Auto-Ohm controls and displays are shown in the control-panel illustration, Figure 1. Pointing leader lines reference each item with an index number. Each index number is cross-referenced to a functional description in Table 2, which describes the function and purpose of each item on the control panel.
Auto-Ohm Operating Procedures Table 2. Functional Description of Auto-Ohm Controls and Display Figure 1 Index # Adjacent Panel Marking Functional Description Input power connector with third-wire safety 1 120/240 Vac, 8A, 50- 60 Hz ground and 10A built-in circuit breaker LCD; 4-line by 16-character; back-lighted; 2 Displays menus of selections, operator no marking entries, and test-measurement results One-knob control (all Auto-Ohm menus and 3 selections are controlled by this one control CHANGE knob).
Auto-Ohm Operating Procedures 4.0 OPERATING VOLTAGES The Auto-Ohm operating voltages are selectable between 90-130Vac, 50/60Hz or 210-240, 50/60Hz. Voltage selection is set by jumpers on terminal block as shown on Table 3, below. Table 3. Voltage Selection VOLTAGE SELECTION TERMINAL BLOCK JUMPERS 90-130Vac Brown to blue & yellow to green 210-240Vac Blue to yellow 5.0 CABLE CONNECTION (See Figure 2.
Auto-Ohm Operating Procedures 6.0 OPERATING THE AUTO-OHM (See Figure 3. for step-by-step procedures.) The Auto-Ohm is operated by just one dualfunction control knob. The operator turns the control knob to scroll through different menu selections on the display. When the desired option appears, it is selected by simply pressing the control knob like a pushbutton. Review Figure 3 before proceeding with the step-by-step procedures that follow. 6.1 STEP-BY-STEP PROCEDURES 6.1.
Auto-Ohm Operating Procedures Figure 3.
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Auto-Ohm Operating Procedures a. This screen prompts the user to select the desired test current. Test current options are: 10, 25, 50, 100, CUSTOM, and ABORT TEST. If any of the 10 through 100 amperes options is the choice, turn the control knob until that current level displays, then press the knob to enter that choice (in which case go to step d). If a smaller increment of current is desired, select CUSTOM (figure 6) and press the control knob and go to the next step.
Auto-Ohm Operating Procedures I=100 AMPS 120 MICRO-OHM Figure 12. Test Current & Resistance Readings h. The Auto-Ohm then ramps the test current back to zero. Figure 12 shows the final resistance measurement and the test current at which the resistance was measured. i. After the result is examined, press the control knob and observe that the display returns to the MAIN MENU.
Auto-Ohm Operating Procedures ATTACH SHORT BAR Figure 16. Attach Short Bar Prompt b. Attach the test leads on an unused bus bar (several inches apart, the spacing is not critical, since this is a functional check). Press the control knob to start test. c. This display shows the current ramping status. When test current ramps to 100 %, this display is automatically replaced by the following test-result display. CURRENT RAMP CIRCUIT “PASS” Figure 17. Current-Ramp Circuit Pass Message d.
Auto-Ohm Operating Procedures a. Press control knob to select this mode. The user now can select any of the last three reading to be displayed. To select the reading, turn the control knob to one of the menus. PREVIOUS RESULTS PREVIOUS RESULTS PREVIOUS RESULTS Figure 24. Select Reading Menus 12 b. When one of the prompts above displays, press the control knob to display reading. I= 100AMPS 120.2 MICRO-OHM Figure 25. Test Record Readout c.
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APPENDIX A Auto-Ohm Troubleshooting Guide Item 1 Symptom Reading is incorrect. 2 No Test Current. (Current % read zero) and resistance reading=0 3 Have test current but resistance reading = 0. Possible Problem 1. Poor connection at the test clips. 2. Broken sensing leads. Solution 1.Check connections to ensure teeth of voltage-sensing and current clips are firmly in contact with the device under test. 1. No test current going through the device under test. 2. Inspect sensing cables. 1.
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APPENDIX B C-Clamp Plastic Clip Current Connector Sensing wire Connector Illustration of plastic quick-disconnect clip, C-clamp, Current Connector, and Sensing-wire connectors 16
Auto-Ohm Operating Procedures 1710 Grevillea Court. Ontario, CA 91761, USA Phone 909-923-9390 Fax 909-923-9391 Website: http//www.vanguard-Instrumentss.
Auto-Ohm TM 04/304/01: OAK 18
