Making 4 20mA Current Source 

This is basic... But you presented it intelligently... I never thought that... i only need a potentiometer to produce a current source... 😄 Thanks so much sir... Bravo.... Now i can test my positioner...with this simple cicuit device 😄 😄 😄

Thank u soo much sir Actuelly we have a lot of ultrasonic sensors in our water treatment plants and with some other equipments as well Thats y i requested for it Plz make more videos to do more simplify this importent topic

VERY GOOD, WELL DONE

This video does a disservice to viewers who are hoping to learn more about making 4-20mA current loops work. It supposes that all one needs to make a 4-20mA current 'source' is a variable resistor. Well, in fact one can use a variable resistor by itself, as shown in the video, but it will never be a reliable 4-20mA controller. This is because it cannot monitor the actual resulting loop current, and cannot automatically adjust to variables in the current loop. If the power supply voltage wavers, the current will change. If the loop resistance changes (for any reason, including temperature, connection resistance, etc) the current will change. If another receiver is added to the loop, the current changes. The upshot of this is that a simple variable resistor can be used to vary loop current on a crude, temporary basis. But it cannot work effectively in real applications. Only a proper 4-20mA "transmitter" can do this, because a transmitter not only adjusts its own resistance automatically, it also monitors the loop current so it can compensate for resistance changes elsewhere in the loop.

Very good job sir jee. Please make a lot of in this type vidio. God bless you

Many thanks, was useful

🎉super

Thank you so much

Good info...thanks

thanks

What if we know current output somewhere 400-1000 ma , varying voltage 25 -400

What was the current rating for the vdc 24 volt which you used...let us know

Very good video, just 1 question, why the R variable (potentiometer) have 3 wires? Resistance wire "A" go to + 24 vcd Resistance wire "B" go to multimeter (+) Resistance wire "C" go to ????? Thanks

very nice video . thank you . need alot from you .

Nice, it will be better if there is display.

input 24v out v?

wait for your new videos . thank you

IF YOU TURN THE POT TO LOW RESISTANCE POINT, IT WILL BE LIKE SHORTING THE 24V, HIGH CURRENT CAN DAMAGE THE MULTIMETER OR THE FUSE WILL BLOW, EITHER INSIDE METER OR THE POWER SORCE

Sir i am connect but may be I am wrong plz clear me connection of pot meter it have three terminal one common which two wire need to connect Regards

This is for generating current source from external DC power supply. How to simulate 4-20 mA current in loop powered instrument system??

You may have mentioned this in the vid but, my hearing is not that good. Is the pot 10 turn? Is it carbon or wire wound. Thanks.

wiasou sei denn de videos oooolbm ve sette kommischn inder de koan enlisch dorredn gmocht. bleibs in enkrn versifftn lond. ess pailts es jo decht net gorasou sso

potentiometer 3 k, voltage 5 vdc So how much mili ampere??

This is very dangerous to any instrument, you need to put one resistor in series first to limit the current not go up more then 20 mA,

Nice video but I need more precise current.

Здравствуйте,R(resistor)=12000 Om? или 5 кОм?

I have a doubt .. you are checking current from positive and negative terminal. How it is possible

Can we use directly as a m.a for vfd ? Or use R to I converter in between ? Please replay me

That's wrong,This isnt a current source. a current source must give a constant current. That cun be using bipolar or FET by making Vb constant then Ic constant or Vgs constants then Id constant.

This is wrong. It can not be used to test any instrument. Bacause instrument resistance will be added in series. Ideal current source keep current constant regardless of load resistance.

I TRY IT BUT ITS NOT WORK.....

Oh brother, are you serious.

Current source

This is not a source children stuff

You have connected wrong

Not correct method. This is jugadu method

Very bad idea, think again

Thanks you so much

Thank you Was useful

Thanks