mckinney3
New member
- Location
- anderson, sc
OK, I am just a hobby guy and am working my way around the proper use of a multi-meter.
I have a new All-Sun EM830 meter.
Question 1: I take a 40 watt (listed on packaging) light bulb intended for 110 use. I set my meter to 200 ohms and measure the resistance. I get a reading of 31.8. I assume this is 31.8 ohms.
Realizing that getting the decimal correct is important and I want to double check the logic of my reading. So I plug the values of 110 volt and 31.8 ohms into an online calculator. The answer is 380.5 watts. Since the label states 40 watts, I seem to be off by a factor of 10 on my ohm reading. The reading should be 318 ohms
I am confused as to how to read the meter to get 318 ohms instead of 31.8
Question 2: I want to measure the amps being used by a 12 volt DC heating pad powered by a 12 volt DC deep cycle battery.
The pad has a controller in the circuit so I can't directly measure resistance and calculate amps. So I figured I would put the meter inline with the pad running and measure amps directly.
Regardless of how I set up the meter range, I do not get any measurement and the insertion of the meter does not complete the circuit so that the pad operates. I tried just simply creating a circuit with a 1.5 volt battery and a 1.5 volt bulb (a simple flashlight) I can use a piece of bell wire to jump from the battery (-) to the bulb (-) to complete the circuit and the bulb lights. If I remove the jumper and insert my meter set to read amps, I get no reading as the circuit is not completed (the bulb does not light) regardless of what amp setting the meter is on.
I can't decide of the meter is bad or if I am using it incorrectly.
dan
I have a new All-Sun EM830 meter.
Question 1: I take a 40 watt (listed on packaging) light bulb intended for 110 use. I set my meter to 200 ohms and measure the resistance. I get a reading of 31.8. I assume this is 31.8 ohms.
Realizing that getting the decimal correct is important and I want to double check the logic of my reading. So I plug the values of 110 volt and 31.8 ohms into an online calculator. The answer is 380.5 watts. Since the label states 40 watts, I seem to be off by a factor of 10 on my ohm reading. The reading should be 318 ohms
I am confused as to how to read the meter to get 318 ohms instead of 31.8
Question 2: I want to measure the amps being used by a 12 volt DC heating pad powered by a 12 volt DC deep cycle battery.
The pad has a controller in the circuit so I can't directly measure resistance and calculate amps. So I figured I would put the meter inline with the pad running and measure amps directly.
Regardless of how I set up the meter range, I do not get any measurement and the insertion of the meter does not complete the circuit so that the pad operates. I tried just simply creating a circuit with a 1.5 volt battery and a 1.5 volt bulb (a simple flashlight) I can use a piece of bell wire to jump from the battery (-) to the bulb (-) to complete the circuit and the bulb lights. If I remove the jumper and insert my meter set to read amps, I get no reading as the circuit is not completed (the bulb does not light) regardless of what amp setting the meter is on.
I can't decide of the meter is bad or if I am using it incorrectly.
dan
