Jump to content
Click here to check out this guide

FAQs | Repair Videos | Academy | Newsletter | Contact


DISCLOSURE: We may earn a commission when you use one of our coupons/links to make a purchase.
  • Upcoming Events

    • 30 March 2024 02:00 PM Until 03:00 PM
      0  
      All Appliantology tech members are invited to join in this workshop on all things Appliantological: bidness, customers, tools, troubleshooting, flavorite brewski, whatever. Webcams and microphones are open and live!
      This workshop is also a great time for any students at Master Samurai Tech to bring any and all questions about the coursework. We're happy to walk through any concepts you're having trouble with. Think of it like office hours with your teachers. 
      If you have a specific appliance problem you'd like us to talk about, post it here! We need a problem statement and a PDF of the tech sheet or schematic so we can all see it on screen share. If you have a PDF that isn't already in the File library here at Appliantology, send it to us by attaching it to the contact form. 
      Also, follow this Calendar Event so you'll get notified of new posts here. Look for the "Follow" button either at the top of the topic on desktop or below the topic on mobile.
      Who: This workshop is only available to tech members at Appliantology.
      When: Saturday, March 30 @10:00 AM Eastern Time.
      Where: Online via Zoom
      How:
      Click here to go to the forum topic with the registration link. If you're interested, register now. Arrive a couple minutes early to make sure your connection is working. Set a reminder for yourself for this workshop so you don’t miss it.  And check out past workshops here: https://appliantology.org/announcement/33-webinar-recordings-index-page/

Making Basic Electrical Measurements


Samurai Appliance Repair Man

Recommended Posts

  • Team Samurai

[align=left]Appliances are electro-mechanical devices-- that's a fancy word that means they have electrical and mechanical parts. This also means that appliances can have either electrical or mechanical failures. Most people with one eye and half a brain in their skull can figure out the mechanical part. But very few do-it-yourselfers have even the basic skills needed to troubleshoot an electrical problem in an appliance such as reading a schematic and wiring diagram and using an inexpensive multimeter, like the one shown below ($15), to make electrical measurements.

[/align]

[align=center]00228386.jpg[/align]

Reading wiring diagrams and schematics is something I do all the time on the job. But if you don't know how to use a basic multimeter to make two simple electrical measurements, then you don't have a prayer of troubleshooting even the most minor electrical problem--all you'll be able to do is guess about which part might be bad. That's what we call the Shotgun Parts Changing School of Appliance Repair.

Ok, grab 'hold of those two large lumps at the base of your spine and let's light this candle.

Resistance and Continuity Measurements

[align=center]ohmmeterhowto.jpg

Using a Multimeter to Measure Continuity or Resistance[/align]

The picture above shows how to measure resistance (click it for a larger view). Resistance is measured in units called "ohms." You'll commonly want to know the resistance of things like bake elements and solenoid coils. For example, a good bake element typically has a resistance of about 30 ohms. If your oven's not baking and you measure the resistance of the bake element and the meter doesn't move, then you know you'got a bad element.

A special type of resistance measurement that we commonly make in the field is a continuity measurement. When we're testing continuity, we don't care what the actual resistance is, we just want to know if the thing being tested (switch, wire, fuse, etc.) will allow electricity to flow through it. Continuity is a "yay" or "nay" measurement, a component either has continuity or it doesn't--it's kinda like pregnancy in that sense.

Two things to remember when making resistance measurements: 1) the circuit should be de-energized (for those of you in Palm Beach, this means to unplug the appliance first!) and 2) remove at least one wire attached to the component you're testing to disconnect it from the rest of the circuit so you're not getting a false reading by measuring through the rest of the circuit.

You wouldn't believe the number of grasshoppers I talk to who just off and changed the bake element when the oven didn't work only to find that that wasn't the problem! A simple ohm measurement would've saved them a lot of money and headache. But, some people can't be bothered with a bunch of "useless theory."

Voltage Measurements

[align=center]voltmeterhowto.jpg

Using a Multimeter to Measure Voltage[/align]

The picture above shows how to measure voltage. A voltage measurement at the outlet should be the first thing you do whenever you have an appliance that is completely inoperative, or if you have an electric dryer that's not heating, or an electric range that doesn't get hot enough. You'll need to know the basic anatomy of these various electrical outlets to know what to measure for. Check out the links below for illuminating illustrations of these outlets:

Obviously, to measure voltage, there must be power present. This means you can have a hair-raising experience if you touch the wrong thing with your bare hands. As long as you're holding the probes by the insulated handles and are careful about where you place the metal points of the probes, you'll be fine. I've been working with electricity for over 30 years and I still get shocked every now and then. It only hurts a little, kinda like a snake bite, and it fades quickly. So don't freak out.

Besides the outlets, you'll frequently need to measure voltage at various points inside the appliance. Usually, you're measuring this voltage with respect to ground. That just means that you can clamp one probe to an unpainted metal place on the appliance chassis and then touch the other probe to the points of interest. Your other hand should either be tucked in your pocket or behind your back. This way, you won't get shocked because you won't be giving the current a path to flow through your body. Easy, da?

Current Measurements

[align=center]ampmeterhowto.jpg

Using a Clamp-on Amp Meter to Measure Current[/align]

Here's a clamp-on ampmeter (or amp meter) being used to measure current flow through a wire. This is a common test for determining whether or not a gas oven ignitor is good or bad--the only way to really know is by measuring its current draw and comparing to rated draw. And, yes, Homer, the ignitor can glow orange and still be bad.

You'll also want to measure current draw in cases where you have an electric motor that runs a few minutes then shuts off to see if the problem is with the motor drawing excessive current.

Recommended reading:

 

[align=center]Buy Appliance Parts Here[/align]

[align=center]cover02.gif[/align]

Link to comment
Share on other sites

  • 5 weeks later...
  • Replies 1
  • Created
  • Last Reply

Archived

This topic is now archived and is closed to further replies.


×
×
  • Create New...