How to Read Resistance Values using Analog Multitester
Summary
TLDRThis instructional video teaches how to use an analog multi-tester to measure resistance values. It covers the calibration process, the use of different resistance multipliers, and how to interpret the readings. The video demonstrates measuring a carbon resistor's resistance, adjusting the tester's multiplier, and reading the ohm values. It also explains how to identify short circuits and open circuits, emphasizing the tool's importance in diagnosing electrical issues.
Takeaways
- 🔍 An analog multi-tester can measure resistance, current, and voltage values.
- 📏 To measure resistance, select the appropriate resistance multiplier (1, 10, 100, 1k, 10k, etc.).
- 🔧 Before measuring, calibrate the multi-tester by connecting the positive and negative probes until the pointer reads zero.
- ⚙️ If the pointer doesn't point to zero, adjust it using the ohm adjuster.
- 🔄 If the resistance value is too high, switch to a higher multiplier to get a more detailed reading.
- 📊 To read the resistance value, count the lines on the scale corresponding to the selected multiplier.
- 🔢 The final resistance value is calculated by multiplying the scale reading by the selected multiplier.
- 💡 A carbon resistor was used in the example, and its resistance was found to be approximately 560 ohms.
- 🌐 For a more precise reading, use a higher multiplier and recalibrate the tester accordingly.
- 🚨 A reading of zero ohms indicates a short circuit, while infinite resistance suggests an open circuit.
- 🔦 The multi-tester is a useful tool for diagnosing issues in circuits, such as shorts or open circuits.
Q & A
What are the three parameters that can be measured using an analog multimeter?
-The three parameters that can be measured using an analog multimeter are resistance values, current, and voltage values.
How do you calibrate an analog multimeter before measuring resistance?
-To calibrate an analog multimeter before measuring resistance, you connect the positive and negative probe. It is necessary that the pointer points at the zero value. If not, you adjust it using the ohm adjuster.
What are the resistance multipliers available on the multimeter?
-The resistance multipliers available on the multimeter are 1, 10, 100, 1k, 10k, and 100k.
Why might the needle not move when measuring resistance with the multimeter set to a certain multiplier?
-The needle might not move when measuring resistance because the selected multiplier is too low, indicating that the resistance value of the resistor might be higher than the range of the selected multiplier.
How do you read the resistance value on an analog multimeter?
-To read the resistance value, you look at the position of the needle on the scale. You count the lines from zero to where the needle points and multiply by the selected multiplier to get the resistance value in ohms.
What does it mean if the multimeter's needle points to a high value when measuring a resistor?
-If the multimeter's needle points to a high value when measuring a resistor, it indicates that the resistance is low, and a higher multiplier should be selected to get a more accurate reading.
How do you determine the appropriate multiplier for measuring a resistor's resistance?
-You determine the appropriate multiplier by starting with a lower multiplier and observing the needle's movement. If the needle does not move significantly, you increase the multiplier until you get a clear and accurate reading.
What is the significance of the zero ohm reading on an analog multimeter?
-A zero ohm reading on an analog multimeter indicates a short circuit, meaning there is no resistance between the points where the test probes are connected.
What does an infinite resistance value signify on an analog multimeter?
-An infinite resistance value on an analog multimeter signifies an open circuit, meaning there is no continuity between the points where the test probes are connected.
How can you use a multimeter to check for defects in circuitry or wiring?
-You can use a multimeter to check for defects in circuitry or wiring by measuring the resistance. If the resistance is zero, it may indicate a short circuit. If the resistance is infinite, it may indicate an open circuit.
What is the next step after measuring resistance with an analog multimeter?
-The next steps after measuring resistance with an analog multimeter, as mentioned in the script, would be to learn how to measure current and voltage, which will be covered in subsequent videos.
Outlines
🔍 Measuring Resistance with an Analog Multimeter
This paragraph explains how to use an analog multimeter to measure resistance values. It covers the selection of appropriate resistance multipliers (1, 10, 100, 1k, 1000, 10k) and the calibration process required before measurement. The speaker demonstrates how to adjust the multimeter's ohm adjuster to ensure the needle points to zero. They then proceed to measure a carbon resistor's resistance, starting with a low multiplier and increasing it until the needle moves significantly. The process of reading the multimeter's scale to determine the resistance value is explained, including how to mentally divide the scale for precise readings. The speaker concludes by measuring a resistor and explaining how to calculate the actual resistance value by multiplying the scale reading by the selected multiplier.
🔌 Understanding Multimeter Readings and Resistance Calibration
The second paragraph delves into the process of using different multipliers (1k, 10, 1) for measuring resistance with an analog multimeter. It emphasizes the need for recalibration after changing multipliers to ensure accurate readings. The speaker illustrates how to interpret the multimeter's scale for resistance values, explaining that each line on the scale represents a unit increase in resistance. They demonstrate measuring a resistor and converting the scale reading into ohms by multiplying by the selected multiplier. The paragraph also discusses how to identify short circuits and open circuits using the multimeter, highlighting the importance of resistance measurement in diagnosing electrical issues. The speaker concludes by encouraging viewers to watch upcoming videos on measuring current and voltage.
Mindmap
Keywords
💡Analog Multi-tester
💡Resistance Values
💡Calibration
💡Multipliers
💡Ohm Adjuster
💡Carbon Resistor
💡Short Circuit
💡Open Circuit
💡Kilo Ohms
💡LED
Highlights
Three parameters can be measured using an analog multi-tester: resistance values, current, and voltage.
Today's focus is on measuring resistance values and learning to read the analog multi-tester.
Available resistance multipliers include 1, 10, 100, 1k, 1000, 10k.
Calibration of the multi-tester is necessary before measuring resistance values.
The pointer should point at zero value for accurate calibration.
Adjustment of the ohm adjuster is required if the pointer is not at zero.
If the ohm adjuster is at maximum limit, adjust the needle manually.
Use the multiplier one to measure resistance values.
No movement of the needle indicates a need for a higher multiplier.
Switch the multiplier to 10 for higher resistance values.
Calibrate the tester again when changing the multiplier.
Reading the resistance value involves mentally dividing the lines on the scale.
The value of the resistor is calculated by multiplying the scale reading by the multiplier.
For example, a reading of 13 on a 1k multiplier is 13 kilo ohms.
LEDs can also be tested for resistance using the multi-tester.
A reading of zero ohms indicates a short circuit.
An infinite resistance value signifies an open circuit.
The multi-tester is a useful tool for diagnosing defects in circuitry or wiring.
Stay tuned for upcoming videos on measuring current and voltage.
Transcripts
[Music]
there are three parameters that we can
measure using an
analog multi-tester so these are
resistance values
current and voltage values
so today we're going to measure
resistance values first
and also i'm going to teach you how to
read the values
on the analog multi-tester so since
we're going to measure the resistance
values
you could be able to use any of these
resistance multipliers so we have here
multiplier 1
multiplier 10 100 1k
or 1000 and 10 000 or 10k
so before we measure the resistance
value
we have to calibrate first the
multi-tester
by simply connecting the positive and
the negative proof
so it is necessary that the pointer
points at the zero value
since the pointer is not on the zero
value
we have to adjust it using the
ohm adjuster but unfortunately it is
already on its maximum limit
so we'll try to
adjust the needle
there it goes okay and then we're using
the multiplier one
so let's say for example i'm going to
measure the resistance value
of this resistor assuming also that i'm
clueless
on the resistance value of this resistor
what i'm going to do is that measure the
value
using the multiplier one and then
connecting my test probes in parallel
with the
resistor by the way this is a carbon
resistor
so as you can see
there is no movement on the needle
it doesn't mean that it has no values
it's just
that
the multiplier is too
low perhaps the value of this resistance
is high
so what we're going to do is that we're
going to switch
the multiplier to 10.
apparently the needle moves a little so
i want a more detailed value of
my tester so
what i'm going to do is that i'll move
my tester when i try to adjust
my tester or my knob into
100 multiplier then i have to calibrate
first
by adjusting the
ohmic knob
until such time that the needle points
to zero
so since that the needle points already
to zero then
it means that we could measure now the
resistance value
using the multiplier of 100
so again we're going to see
resistance value you have here
zero one two three five
and then this is your five units
this is your 10 it's up to you to divide
the line
mentally you can mentally divide
the the lines or count the lines of the
omic value the value of this
um resistor is
6 ohms 6 ohms then you have here the
multiplier 100 that will become
6 times 100 it is equivalent to 600
ohms volume of this resistor is 560 ohms
but based on our reading
of course we cannot read the exact
560 ohms
if there's not much discrepancy or
difference with the value
it's okay so let's try another
resistor
supposedly i would like to move
to 1k
okay i make use of the multiplier 1k
i can also make use of multiplier 10
multiplier one but let's say for example
i make is of multiplier 1k
so again since i adjust the tester
i have to calibrate it and then
adjust the knob until such time that it
reaches the zero
okay so there it goes so it's already on
the zero ohms
then release then we have to measure the
resistance value of this this is store
okay so to be able for me to demonstrate
the display i'll fold the terminals
okay okay so
as you can see
the pointer points
on the on this point
on this area will read the values
on the uppermost scale
because this is where the resistance
values
place in so
0 1 2 3 4 5
10. and then this is your 10
this is your 20 so you'll try to divide
each line to be able for you to reach
20 from 10 each line
will be represented by
unit of one let's try one two three
four five six seven eight nine ten
so there are ten lines of each
line each small line will be represented
by unit 1
10 11 12 13.
so this is 13 ohms
but you have a multiplier 1k
okay so 13 times 1k
that is 13 k ohms
or 13 000 ohms
but in engineering we made use
of the three zeros as
represented by kilo so that will become
13 kilo ohms
13 times 1k is 13
k ohms okay so let's move now to this
led so let's try
moving your tester to
again calibrate your tester
okay the needle points to zero so
there's
no need of calibrating your tester
the short terminal is for the positive
of your test probe the longer terminal
is for
your negative test probe
the needle is on the
20 value here
so 20 times 100 that is
2 kilo ohms
so 20 times 100 that is 2 000
ohms or 2 kilo ohms
so that will become two kilo ohms
normally if it's zero ohms it means that
the circuit is shorted
so let's say example we tried to connect
the test probes positive and negative
you can see that the needle fluctuates
to the zero ohmic value
this means that it is short circuit
but if you try to disconnect
the resistance is
an infinite value which means this is a
very very high resistance
and therefore the circuit will be open
open circuit so resistance is a very
useful tool for determining if the
circuit is shorted or
open if there is a defect on your
circuitry
or even in your wirings if there is a
short head or an open circuit
so that's all for now please watch my
next videos
for the current and voltage
measurement
thank you and god bless
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