196 Copyright Goodheart-Willcox Co., Inc. This lab will allow you to explore and use the various features offered on your digital multimeter. Lab Introduction Most HVACR digital multimeters include continuity, capacitor, diode, noncontact voltage, and temperature test features. Refer to the owner’s manual when performing this lab. All of the above features will be used in this lab. Equipment • Safety glasses • Lab board (as wired from Lab 10.2) • 1 – 1N1001 diode or equivalent • 1 – 100 Ω resistor • 1 – run or start capacitor • 1 – cup for crushed ice and water to calibrate temperature probe • 1 – HVACR multimeter Procedure 1. Use the same lab board from Lab 10.2. Do not plug it in. Set the meter for continuity, and touch the probes together to ensure it is working. The buzzer should sound, and the display should read close to 0 Ω. The buzzer means there is continuity—the circuit is complete. The display shows the resistance of the portion of the circuit tested. 2. Use the alligator clip on one probe and attach it to the hot terminal on the lab board plug. 3. Use the test lead to probe TP1. Note the buzzer and displayed value. Record. 4. With the switch open, probe TP2. Note the buzzer and displayed value. Record. 5. With the switch closed, probe TP2. Note the buzzer and displayed value. Record. 6. With the switch closed, probe TP3. Note the buzzer and displayed value. Record. 7. Remove the probe from the hot wire plug terminal and attach it to TP3. 8. With the switch off, probe TP4. Note the buzzer and displayed value. Record. 9. Remove the bulb corresponding to TP3 and TP4. Leave the switch off. 10. Probe TP4. Note the buzzer and displayed value. Record. 11. Turn the switch on and repeat Step 10. 12. Remove the middle bulb and repeat Step 10. 13. Remove the last bulb and repeat Step 10. 14. Replace all the bulbs. Attach the alligator clips to both test lead probes. 15. Attach the probes to hot and neutral plug terminals. 16. With the switch off, note the buzzer and displayed value. Record. 17. With the switch on, note the buzzer and displayed value. Record. 18. Connect the 100 Ω resistor in series with fuse and loads. See Figure 10.3-1. Lab 10.3 Multimeter Features Continued