Tip & How-To about Olympus BX40 Microscope

Bulbs for Microscopes Has it really failed

Often bulbs can look perfectly intact even when the have actually failed.

Use or borrow a multimeter and test the continuity on its continuity setting. It normally buzzes when you put the leads together on most multimeters.

This simple test , plus testing fuses can save calling out an expert

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1 Answer

I have a 2006 dodge magnum my interior lights don't come on when my doors are open or when I turn the interior light switch on is this a fuse if so do any know which one because I can't find it in the manual


Check the bulb, if it's intact then must be a fuse or broken wire. Use a multimeter & check continuity across all fuses if intact then trace wire back from light to switches etc

Aug 13, 2012 | Cars & Trucks

1 Answer

How do you test a non-resetting thermal fuse (196 degree F)? Tests 0 ohms at room temp. Should I heat it to 196 deg and test again?


Just put a multimeter on it. 0 ohms could mean it's open circuit.
Switch multimeter to "continuity" and you should get a beep or a buzz if it's still intact. If you get nothing then it's open circuit and should be replaced. If you test it with heat you will probably burn it out if it's not already broken.

Jan 23, 2012 | Kenmore Dryers

1 Answer

my frididare (side by side) fridge light is not working, even after I have tried two different replacement bulbs. model no. FRS26R2AW4. Any help will be appreciated


Please check using a tester/multimeter for the voltage on the bulb holder or test if the bulb within is fused or not using a continuity test. If not the fault can be with the main door switch of the fridge - normally some switches fail and so there will be no contact. If not there can be break in the circuit line/wiring to the holder.
Getting the correct type of bulb please check on this link:
http://www.espares.co.uk/search/fridges-and-freezers/p/1084

Sep 02, 2011 | Frigidaire FRS26H5AS Side by Side...

1 Answer

light does not work, even with new lightbulb


HI. The actual door switch has failed.

Test the switch for continuity using a multimeter. Set the multimeter to the ohms setting X1. Place a probe on each terminal. The multimeter should change from a reading of infinity to zero when the probes touch the terminals. With the probes still touching the terminals depress the switch, the reading should change back to infinity. If it does not pass both of these tests, the switch should be replaced

Sep 13, 2009 | Whirlpool Refrigerators

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