Electrical Industry Canada: Tools, Equipment & Technology - 9

Foreign substances (dirt, solder flux, oil), body contact with the metal
ends of the test leads, or parallel circuit paths may impact readings. The
human body can be a parallel resistance path, reducing total circuit
resistance. Avoid touching metal parts of test leads to avoid errors.
6. Read the measurement on the display
7. Turn the multimeter OFF to prevent battery drain.
Options for advanced digital multimeters
8. When using the RANGE button to select a specific fixed
measurement range, note the annunciator (K or M) aſter the measurement
in the display.
9. You can use the HOLD button to save a stable measurement to be
viewed later.
10. The MIN/MAX button captures the lowest and highest
measurement The multimeter will beep each time you record a new
reading.
11. The relative (REL) button to set the multimeter to a specific
reference value. It will display measurements above and below the
reference value.
Analyzing Resistance Measurements
The component being tested determines the significance of a resistance
reading. Resistance of component varies over time and component type.
Subtle changes in resistance are not critical, typically. Although they may
indicate a pattern, which should be noted.
Slight resistance changes are usually not critical but may indicate a
pattern that should be noted. For example: as the resistance of a heating
element rises, the current passing through the element decreases, and
vice versa, which is displayed in the diagram:
For circuit boards you may need to liſt one of the resistor leads from the
board to get the correct resistance of the resistor measurement.
The resistance measurement displayed by a digital multimeter is the total
resistance through all possible paths between the test lead probes.
Use caution when measuring resistance across a component that is part of a
circuit.
Always check the circuit schematic for parallel paths. The resistance read is
usually lowered by components connected in parallel.
References:
1. " Long-term sequelae of electrical injury. " Dr. Marni L. Wesner, MD MA FCFP DipSportMed, and Dr. John Hickie,
MD, MSc, CCFP CCBOM. Canadian Family Physician, CFP-MFC Official Publication of The College of Family
Physicians of Canada, September, 2013. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3771718/.
2.Biophsical Injury Mechanisms in Electrical Shock Trauma. Raphael C. Lee, Dajun Zhang and Jurgen Hanning.
Annu. Rev. Biomed. Eng. 2000:2:477-509.
3. American Electrician's Handbook, Tyrell Croſt Consulting Engineers. Clifford C. Carr, E.E., P.E., Fiſth Edition,
McGraw-Hill Book Company, Inc., 1942. " Measuring, Testing and Instruments, 158. Electricians oſten test circuits
for the presence of voltage by touching the conductors with the fingers. 159. The presence of low voltages can be
determined with tasting, "
4. Technical Safety British Columbia (TSBC) Electric Shock.
https://www.technicalsafetybc.ca/State-of-Safety-2018/safety-stories/electric-shock
ELECTRICAL INDUS TRY CANADA
VOLUME 2, ISSUE 1
9
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3771718/ https://www.technicalsafetybc.ca/State-of-Safety-2018/safety-stories/electric-shock https://www.fluke.com/

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