Electronic Safety Page

Introduction

This page is for all things Safety

Mulitimeter

• Set to DC because we not doing AC while I need to read this
• Positive (Red lead) to Positive
• Currently own QM1323
  • Probes CAT III 1000v, 10A
• Don't let the probes touch
• Keep tips covers to reduce change of touching
• A negative reading means you have the probes in the wrong way

Measure Battery

• Identify +/- of battery
• Make sure battery is fixed in place
• Set Multimeter to V + DC current
• Plug black lead into COM, Red into non-10A or 20A
• negative black lead to -battery, positive red lead to +battery

Measure Mains

Don't do this unless you know what you are doing. And do not let the lead touch when putting them into the slots

• Set Multimeter to V + AC current
• Plug black lead into COM, Red into non-10A or 20A
• negative black lead to earth, positive red lead to power

Measure Continuity

Testing for this means test for connectivity. I.E. is this a curcuit. We are not measuring volts only connectivity.This is done with the power off

• Set Multimeter to V + AC current
• Set Mode to show speaker or no sound will occur

Measure Amps

Testing a light bulbs amps we need to insert the multimeter into the circuit.

• turn power off
• put meter as the first item from the positive side of the power source
• set meter to 10A
• plug red probe on the meter into 10A
• connect black probe to + of the light bulb
• connect - of light bulb to - (ground) of power source
• turn power on

Mosfet Protection Circuit

This circuit protects the user from accidentally connecting the power in reverse and is an improvement on just using a diode. In the example a MOSFET P Channel was used.