Digital Multimeter Calibration Purpose The purpose of this procedure is to provide instruction for the calibration of digital multimeters (DMM). Scope All multimeters (multi-range instruments used to measure voltage, current, and resistance) are to be verified in calibration no less than once per year. Procedure Preliminary Instructions and Notes. Read this entire procedure before beginning the calibration. Calibration shall be performed in an environment that conforms to Manufacturer Specifications.
The digital multimeter will hereafter be referred to as the Instrument Under Test (IUT). Verify that the IUT is clean. Visually examine the IUT for any condition that could cause errors in the calibration. If any of the requirements cannot be met, refer to the applicable manufacturer manual. If a malfunction occurs or a defect is observed while calibration is in progress, the calibration shall be discontinued and necessary corrective action taken; if corrective action affects a measurement function previously calibrated, the function shall be recalibrated before the remainder of the procedure implemented.
Reference Material Applicable Manufacturers Manual or Brochures. Specifications The specifications of the IUT are determined by the applicable manufacturer's documentation.
If the manufacturer's documentation is not available, then the specifications identified in this procedure are used. Equipment Required The Standards listed below should be selected on the basis of their higher accuracy level when compared to the unit under test.
Equivalent Standards must be equal to or better than the Minimum-Use-Specification. Minimum-Use-Specifications for Standards listed are 1/4 the accuracy required by the IUT. Rotek Model 2500 Calibrator or equivalent. Diode Test Fixture. Test Leads. Continuity Test Fixture. Capacitance Test Fixture.
Thermometer. Hydrometer Set-Up Turn all power on (calibrator and the unit to be calibrated).
Allow the instruments to stabilize for approximately 5 minutes. Conduct the tests in an ambient temperature of 25 ± 5C and a relative humidity of less than 80%. Note: If the IUT has an automatic ranging feature, then the function being checked (i.e.
Voltage, current, or resistance) must be verified in the variable range mode as well. Battery Replacement Replace the battery in the IUT and make sure the battery contacts are not dirty. Detailed Procedure Display and Switch Test Turn the IUT on and verify that all LCD segments are working and not dim. Verify that the selector switch(s) is/are working properly. Make sure the Low Battery indicator is not showing. Resistance Check Connect the calibrator between the V/ohm and common input terminals of the IUT. Use the following chart to verify the resistance values.
Step Range Input Display 1 200 ohm Short 00.0 to 00.5 2 2 k ohm Short 0.000 to 0.001 3 2 k ohm 1 k ohm.998 to 1.002 4 20 k ohm 10 k ohm 9,98 to 10.02 5 200 k ohm 100 k ohm 99.8 to 100.2 6 2000 k ohm 1 M ohm 998 to 1002 7 2000 M ohm Open 0.10 to 00.0 Continuity Test. Select the continuity check function on the calibrator. Connect the test leads to the V/ohm and common terminals of the IUT. Momentarily short the test leads together and observe that the tone sounds. Connect the test leads to the continuity test fixture between the 100 ohm test points. No tone should be heard indicating non-terminating connection. Connect the test leads to the continuity test fixture between the 50 ohm set up.
The test tone should indicate continuity between the test points. DC Voltage Test. Use the calibrator to supply the correct DC voltage listed below. Set the calibrator for a zero volt input. Connect the calibrator output to the V/ohm and common input terminals of the IUT.
Note: Connect the ground/common/low side of the Rotek 2500 to the common on the IUT. With reference to the table below, select the IUT voltage range and set the calibrator output to the corresponding IUT input voltage. Test per the following chart and verify that the display falls within the limits given.
Step Range Input Display 1 200mV 190mV 189.7 to 190.3 2 200mV -190mV -189.7 to -190.3 3 2V 0.0V -0.001 to 0.001 4 2V 1.9V 1.897 to 1.903 5 20V 19V 18.97 to 19.03 6 200V 100V 99.84 to 100.16 7 1000V 400V 399.3 to 400.6 AC Voltage Test Use the calibrator to supply the correct AC voltage in the following test:. Set the calibrator to 60 Hz.
Connect the calibrator output to the V/ohm and common input terminals of the IUT. Connect the ground/common/low side of the calibrator to common on the IUT. With reference to the table below, select the IUT voltage range given in step 1 and set the calibrator output to the corresponding IUT input voltage.
Verify that the display reading is within the limits shown. Step Range Input Display 1 200mV 100mV 99.0 to 101.0 2 2V 1V 0.990 to 1.010 3 20V 10V 9.90 4 200V 100V 99.0 to 100.1 5 750V 400V 294 to 406 DC Current Test Use the calibrator to supply the correct DC current listed in the table below:. Set the output of the calibrator to zero mA. Connect the output of the calibrator to the lowest current terminal (typically 200 mA) and common input terminal on the IUT. Note: Do not exceed the maximum current rating of the meter.
Kal Equip 3000 Digital Multimeter Manual
Only test for values the meter is capable of reading. With reference to the table below, select the IUT current range and set the calibration output to provide the corresponding IUT input current. Verify that the display reading is within the limits shown.
Step Range Input Display 1 10A 1A 0.98 to 1.02 2 10A 5A 4.90 to 5.10 3 10A 9A 8.82 to 9.18 AC Current Test Use the calibrator to supply the correct AC current listed in the table below:. Use the following table to verify that the meter is functioning within the specified parameters. Set the output of the calibrator to zero mA. Connect the output of the calibrator to the low current input terminal (typically 200 mA) and the common terminal of the unit under test.
Note: Do not exceed the maximum current rating of the meter. Only test for values the meter is capable of reading. With reference to the table below, select the IUT current range and set the calibrator output to provide the corresponding IUT input current. Verify that the display reading is within the limits shown. Step Range Input Display 1 10A 1A 0.97 to 1.03 2 10A 5A 4.87 to 5.13 3 10A 9A 8.77 to 9.23 Logic Test Use this procedure to test weather the logic function is indicating the correct state. Set the IUT to the logic test mode and insert the test leads into the V/ohm and common terminals.
Short the leads together and verify that the meter indicates a low logic state. Set the calibrator to 0.400 VDC and connect the meter to the output terminals. Verify that the meter indicates a low logic state. Set the calibrator to 3.500 VDC and verify that the IUT indicates a high logic state.
Frequency Test. Connect an oscilloscope to a function generator to measure AC sine waves. Set the function generator to output 10 VAC and use the oscilloscope to set the frequencies from the following table. Connect the IUT leads to the V/ohm and common terminals on the IUT and to the ground and output of the function generator. Verify the meter is displaying proper results from the table.
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Vehicle manufacturers have helped you locate a driveability problem by designing Electronic Control Unit s with trouble-code generating capabilities. But, the ECUs aren’t perfect because they don’t cover everything (most glitches and intermittents). On-board diagnostic systems are engineered with fairly wide set limits for sensors, actuat ors, connectors and terminals. When a component exceeds its limit consistently, a trouble code is generated. But to keep warranty costs in line, tolerances aren’t set to catch all transients, even though they can cause some of your worst driveability problems. Therefore, repair technicians are finding more and more uses for a Digital Storage Oscilloscope (DSO) and a Digital Multimeter (DMM) thesedays.
A DSO can capture a live “signature” of a circuit and store it for later analysis or comparison against Known-good waveforms - an invaluable resource for detecting marginal components. A GMM (Graphing Multimeter) gives you advanced multimeter capabilities coupled with the visual power of trend graphing and waveform display. This Met er a combination DSO and GMM represents the most powerful and versat ile tool available for troubleshooting automotive electronics since we can track down elusive no-code driveability problems.
1.1 COMPARING SCAN TOOLS, DSOs AND DMMs All of these tools have unique capabilities, and today’s vehicles demand that automotive technicians are able to use all three tools to correctly diagnose various driveability problems. DSOs alone cannot replace DMMs or scan tools.
By the same token, DMMs or scan tools cannot replace DSOs. For example, when anti-lock brakes on your car are sometimes erratic, you might firstly try a road test to notice that the ABS light does not come on.
When you get back to the shop, you plug in your scan tool and find no trouble codes. Because you still have your DMM, you follow the manufacturer’s instructions and you look at the output voltage from each of the wheel speed sensors.
They all appear to be in tolerance, and the manufacturer’s fault tree recommends you to replace the ABS computer. Unfortunat ely, the ABS computer on this vehicle is embedded in the mast er cylinder, so you must replace everything. The worst thing is the problem still exists even after you complete all of the work. Normal ABS Signal Most of the signal shown above is visible to scan tools, DSOs and DMMs. Faulty ABS Signal However, the faults shown above are not visible to scan tools and DMMs. They are only visible to DSOs. 1-1 Contents Menu Overview 1.
Kal Equipment 3000 Multimeter
Introduction 1.1 Comparing Scan Tools, DSOs and DMMs 1- 1 1.2 Vehicle Service Manuals 1- 2 2. Safety Information 3. Focus t25 free download utorrent video downloader. Automotive Electronic Signals 3.1 Primary Signal Types Found in Modern Vehicles 3- 1 3.2 Critical Characteristics of Automotive Electronic Signals 3- 2 3.3 The Golden Rule of Electronic System Diagnosis 3- 2 3.4 Signal Probing with an Oscilloscope 3- 2 4. Getting Started 4.1 Product Description 4- 1 4.2 Quick Tour 4- 2 4.3 Front Panel Controls 4- 6 4.4 Measurement Connections 4- 7 4.5 Grounding Guidelines 4- 8 4.6 Display 4- 9 4.7 SCOPE Mode 4-15 4.8 GMM (GRAPHING MULTIMETER) Mode 4-16 5. Instrument Operation 5.1 Instrument Test Modes 5- 1 5.2 SCOPE Displays 5- 1 5.3 GMM Displays 5- 7 5.4 Dual Input Scope Operation 5-13 5.5 Changing the Vehicle Data and Instrument Setup 5-13 5.6 Freezing, Saving, and Recalling Screens 5-17 5.7 Glitch Snare Operation 5-18 5.8 Tips for Noise Management 5-19 6.
Automotive Diagnostics & Applications 6.1 Component Tests 6- 1 6.2 Sensor Tests 6- 1 6.3 Actuator Tests 6-32 6.4 Electrical Tests 6-48 6.5 Ignition Tests 6-57 6.6 Diesel Tests 6-68 7. Maintenance 8. Specifications Glossary Menu Overview 1.
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