Hi, welcome to product test and review by Robojax. my name is Ahmad Shamshiri. I am from Canada
we're going to test this geek robot 10 ampere hundred volts DC volt ampere
meter let's get started with this.
this module is very simple with large digital display the top row shows the
voltage then the current is shown in the second line and the third one is the
power so this will be the multiplication of voltage times current is a power and
it can measure up to 1,000 Watts. the voltage the maximum voltage it can
display is 100V and the maximum current is 10 ampere. this module is
offered in 5A and also 10A. You can get 5A and 50 volts or 10
ampere and 100 volts .so you can connect up to 100 volts. and on this side
it has a clip for the panel in case if you have some panel so you can inset it
and it will be clamped on the panel. and another good characteristic of this one
is for voltage calibration and current collaboration we have direct access of
potentiometer. there is other model that I've done the review the link will be
available below this video. that one you need to do a little extra work to
adjust it. the benefit for this one is that easily accessible and you can
change it. we have sample connections. here three wires here for the voltage
two wires for the current that let me turn the light off the light is now off.
and this is how we would see it there is also some backlight from this on this
section and this can be viewed very easily it's very bright. the length of
this is 79.3 millimeters the widht is 42.8
millimeters. if you want to create a hole on the panel and thirsted let me
show you that size is 39.1 millimeter the West
and the length is 71.4 millimeters the depth of the module is
41.8 millimeters. with this connector and as much as you can
bent it you need at least 30 millimeters space to put this. and if you are
interested in the weight of this it weighs 32.5 grams.
Wiring explained
if I want to show you how to measure the current with a current meter this is the
battery and this is the load. the positive enters the device and there is
a shunt resistor and passes through the negative of this goes to the positive.
so for the load this wire is positive because it has just come and passes
through. this module does not reduce it is just 48 millivolts will be reduced
which I'm gonna show you next. and the negative will be connected from this
side. so for the load the positive comes this way the negative comes this way and
the load will turn on. doesn't matter if this is inductive load like motor or it's
a light or another device. to clarify the operation of this this needs separate
voltage between 7 to 12 volts to operate. so you need to connect separate powers
away for this and then if you need to measure the power then you need to
connect the voltage from the source to this one. here that is how it works
we have two wires here these two this will be connected to your power
supply for this seven to 12 volts and the red will be connected to the same
thing so a let's say you connect 9 volts and it will work. and then to
measure the power you need to connect this white to the battery. and these two
are for the current the current will come here will pass through this and go.
so from positive if we say it goes like this and exits. and here is a wiring
diagram the two wires for the power supply will be connected to your 7 to 12
volts. here this is green in our case it's white and these two are the large
connection. and this is a shunt resistor.
here the this is a shunt resistor and these are the two wires that I just
shown you. and the power supply will be connected to these two. so you will
connect these two wires to the power supply and this goes to the power source that
you are measuring the current. this is your load
they put a small sign this is let's say your bulb, your motor whatever you have
the positive from your battery goes to the motor and the negative goes to the
negative of the device the positive enters the device and there is a shunt
resistor. and passes through and from the other side of the motor the the negative
of the motor will be connected to the positive of this thick wire. to this one.
and then to the display the powers on the screen the last wire which is white will
be connected directly to the battery source that you're connecting to the
motor. this one will be connected so this is
that wire. and here's how I have connected it the two
wires to power this is that these two wires the left one I'm connecting it to
a separate source as I have here this is my 10 volts that I'm connecting just to
power this up. negative to the negative positive to the positive so this now has
a power. the white wire is now hanging
and now this is my battery which I will supply this to my electronic load or a
motor or whatever I have these two are my power supply of the battery that I'm
connecting to my load the first thing that I do is that the negative of my
battery will be connected to the negative of the meter directly these two
are connected to my electronic load which could be light which could be a
motor whatever you have. the positive from the battery will be connected to my
load now this is connected to the load this is the load left with negative from
the load and positive from the musing alligator clip to connect the meter to
the load the positive is now connected from the meter to the negative of the
load. and the last thing to do is this white wire on this side if you see it
green that's also fine. the last wire this is to display the voltage of the
load and calculate the power. this will be connected directly to the positive
that goes from the battery to the load in here.
and now this is connected
Current and Power consumption demonstration
currently the Lord draws 2.36 ampere and if you multiply this this is
a power 34.2 watts and if I change the voltage you will see the power will
change but the current is constant. and let me increase it.
and as you can see we have now 31 volts at the input and 73.1
watts. and let me change it to 5 ampere.
now the current is 5 ampere with 31V. as you can see it's
three times five is hundred and fifty two thousand hundred and fifty watts.
increase the current let's make it 10 ampere maximum so now we're drawing 10
ampere from this. let me see if this is hot very nice I didn't feel (heat) anything .so
the current is very exact I'm drawing 10 ampere. the voltage is a little of the
actual voltage that I have is 21 point 4 and here is shoes 21.7 maybe I have some
voltage drop on the path. let me increase the current and see if it can display it.
okay so 11 also can be displayed let's go 15 jump.
no it doesn't display even though the current is now 15A
it shows 11. let me go 12 no, 12A is not shown. it shows 11 the actual current is
now 12. so let me go 10 so it it has been set to display only 10 ampere
Calibrating Voltage
and to change the voltage that they want to calibrate the voltage connected to a
proper voltmeter and then rotate this until you see.
so you see we can go 19.4
now this is 21.4V properly calibrated. and for the current
as well because a current is correct, I'm not touching it.
Measuring Shunt Resistor Voltage
Currently there is 10A passing through this and it goes through the shunt
resistor here. let's measure the voltage and see how much voltage is dropped
across this shunt resistor.
so we have 48 millivolts the negative half due to polarity if I change the
polarity that we can positive so there is 48 mV
drop. very minimal drop(or reduction to the voltage coming from power source to your load)
Canclusion:To find resistor value we use Ohm'e law R=V/I, where V is voltage, I is the current.
V=48mV=0.048V, I=10A therefore R=0.048V/10=0.0048Ω or 4.8 miliohm (mΩ)
and for conclusion I would say that this Deek-robot DC power meter or currently
and power meter is very nice very accurate easy to
use, sample and the it's very bright and digital large you can see them easily. I
have no affiliation with them. I would like to sincerely thank the following
people who have supported me where patreon.com
Subtitle typed and corrected on Jun 14, 2020 by Ahmad Shamshiri.
I did my part to help you learn. Now you can simple y subscribe to my channel
and click on 👍 the video and write simple "Thank you" in the comment
the link to my PayPal account is below the video in case you want to send cash donation. Thank you.
thank you for watching if you liked this video and learned something please thumb
up 👍. if you have comment or question posted a comment section below I try to
answer and reply. if you want to get updates of my upcoming videos you may
subscribe now.