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A probe for monitoring electrical equipment of a car

Electronics
Added 17 comments

Hello, friends the inhabitants of our site and site visitors! I bring to your attention a device that every car owner needs. This is a probe for monitoring the electrical equipment of a car. They can determine the state of the battery, check the voltage regulator, the condition of fuses, relay windings, the presence of voltage at any contacts of the car, the integrity of the wiring, check the health of the capacitor, and much more.

The device diagram is shown in the photo.

It consists of a milliammeter with a scale of 10-15mA, two resistors R1 and R2, a 1.5V battery, three plug connectors for connecting test leads, and a housing in which all these parts are located. Using test leads connected to connectors 1 and 2, you can measure the resistances and integrity of the wiring. And having connected to sockets 1 and 3 - we measure voltage in a car network. The scale of the device is calibrated with a measurement limit of 1 V, and plotted under the main scale.

To assemble the homemade product, we need the following parts and tools.

It: The housing is from a PC951A automobile relay, a milliammeter with a 10-15mA scale, an MLT resistor of 0.5 W-900 ohms -1pcs, and 100 ohms - 1 pc. Resistors are selected when setting up the device, and can vary greatly from those indicated in the diagram. 1.5-volt battery, 3-pin connectors, mounting wires, small battery case.

Instruments: soldering iron, solder, tweezers, pliers, nippers, drill, drill, round file, M-3 screws and nuts, multimeter, power supply from 1 to 15 in.

We begin assembly homemade.

Step 1. We disassemble the milliammeter case, remove the measuring head from it.

We connect to the head clamps a power supply with a voltage of 15 V.

We connect the plus of the unit through a 1 kΩ variable resistor, and in series we connect a 470 ohm constant resistor to this resistor. Rotating the handle of the variable resistor we achieve the deviation of the arrow of the device by the final division of the scale.

Then, having measured the resulting resistance, we set a constant resistor instead of a variable.Then, connecting in turn the voltage from 1 to 15 V, we calibrate the scale of the device by applying a new scale, placing it under the existing one, after 1 century.

Step -2. We select the resistor R2, connecting instead a variable resistor of 1 kΩ with a 47 ohm resistor connected in series with it. We close the connectors 1 and 2 together, rotate the handle of the resistor, we achieve the deviation of the arrow of the device to the final division. Then we put a constant resistor instead of these two. Then, you can also calibrate the scale for measuring resistance, connecting in turn to terminals 1 and 2 resistors at 2 com, 4 com and 6 com, apply the corresponding marks on the scale. This device can measure resistance from 0 to 6 com. I did not do this, because I am quite happy with such a scale.

Step -3. We remove all the insides from the existing PC951A relay case, except the input connectors, I used them instead of the input terminals.

In the case we mark a hole for a milliammeter, cut it out. Then we install the battery case and the device itself.


Step 4. We solder according to the resistors selected by us the entire circuit of the device. We fix the device in the case, and the outer cover, we make measuring conductors. We check the device by connecting any wire to sockets 1 and 2, and make sure the arrow deviates by the final division of the scale. We connect any battery to connectors 1 and 3 and measure its voltage.

The device is ready, now it can be transported in a car, and believe me, it is necessary in a long journey.

I wish you all good luck in your work.

Happy New Year! See you again.
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17 comments
+2
Reply To quote A complaint
Damn .... And I thought that ozone from oxygen differs only in the number of atoms in the molecule ... But it turns out that it also needs to be excited ...
P.S. Probably a long time does not exist. I think in an excited state he quickly finds a mate !! ))))
0
Reply To quote A complaint
Who does not know about Ozone, this is oxygen brought into an excited state.
High voltage, such as during a thunderstorm
0
Reply To quote A complaint
ROM erased, ozone stink of horror
+3
Reply To quote A complaint
It was the case, in the North, with ultraviolet at night (polar), not so much, I collected a suitcase - a choke, a DRL-250 lamp (or 400?) With a crushed outer bulb on a rotary cartridge, a timer from the washer. Flares up in a minute. Ultraviolet is hard, carries ozone for a couple of meters. Himself sunbathed for 2 ... 3 minutes at a distance of a couple of meters, but with glasses, but the wife before one vacation wanted to get bronzed - the skin (on her feet for some reason) got off with rags, however, almost painlessly. From insects not bad.
Well, RPZU 573rf2, rf5 were erased so that sometimes they were no longer recorded.
0
Reply To quote A complaint
No one dismantled the DRL paw?
It has a flask in a flask.
My friend made a tanning device
I don’t know if he is alive now.
+1
Reply To quote A complaint
The scale of the device is calibrated with a measurement limit of 1 V,
And from the further text it follows that the limit is not 1 V, but 15 V.
In parallel to the head, protective diodes must be added.
If you want the accuracy of the resistance measurement not to depend on the discharge of the battery, you need to adjust the short-circuit current of the probes 1-2.
The resistances indicated in the diagram do not correspond to either 10 mA or 15 mA. )))
About stretching the measuring range of the voltmeter is already mentioned above.
+1
Reply To quote A complaint
Our breaks were long, 15 minutes each, and one whole and half an hour. So I had time to go out for a smoke and then do my homework.)
Well, that’s not the point yet, to do homework at breaks, we played at breaks ... how to describe this game - two teams of five people, one of them a goalkeeper, drove a table tennis ball in the corridor with books instead of rackets with books.
I remember one case - they asked us to learn some poem, which I certainly didn’t teach, they started to ask everyone according to the list from the magazine, so I managed to learn it “by ear” until the turn came to me, since I was listed at the end of the list.
+1
Reply To quote A complaint
Well, here's another, count two, not two, took it all!

Not. I'm really fair! (I’m not joking. Conscience would have seized in that case. I didn’t do that ...)
+1
Reply To quote A complaint
Well, he needs it, he asked for it!

But really it was. Most of all I can not stand those who "ponte empty bashes" ... And this one is young, he just came and ponto-o-ov !!! He loved very much to “humiliate" someone ... I answered him several times with a taunt ... That was "gaining momentum" ... Mutual hostility ... On the last day I could not endure ...)))) Already did nothing ... They just crowded in the gym ... Well, he and let me belittle me again ... I replied that I had met people like them before that they built themselves up as heroes where they knew they won’t get their faces ... Inside they usually have a "girl" hiding ...
He (in front of the girls))) soared "Is that you, shit, could you give me a face ??? (Quote. Just like that, word for word) ... I reply," And you ask well! " ... He is "Well give!" ...
... Well ON !!! ))))). I don’t like it when they ask me for a long time))))
The boys dragged us after an exchange of blows .. But I snapped his lip ... And he (schmuck) complained to the director and I will teach ... But it also played into my hands a little - he retroactively put me two in the magazine, and When this incident developed, I already had every right to complain about it. And the whole class confirmed ...)))))
In general, they hushed up, of course, so as not to get to the DISTRICT ...
And then I punished him for these deuces ... In the evening we met on the bridge over the river. (Incidentally. Not on purpose). And did not pass by.)))). He offered him two options: either take a swim, flying away from the bridge into the river, or push a matchbox with his nose through the entire bridge. Pushed through. Everyone in sight))))) (Here it is, "heroic essence")
0
Reply To quote A complaint
Valery
who has two on the desk, and took away
Well, here's another, count two, not two, took it all!
managed to fight with a physical education teacher
Well, he needs it, he asked for it! xaxa
+2
Reply To quote A complaint
Yes, from the sixth grade, I stopped doing homework, as a result, work in the lesson is five, for homework is one, the arithmetic mean is three.

And I - exactly from the sixth !!! ))) And from the eighth I stopped carrying my briefcase.))) There was one notebook (general) for all the lessons)))). I took the books from my schoolmate ... And if he didn’t have one, he took it from the one who has two on the desk.
But that did not stop me from finishing with the “silver” ... We had long changes, 15 minutes each, and one whole and half an hour. So I had time to go to smoke, and then do my homework.)))))
At school, a teachers' council was collected on the issue of giving me a medal or not ... Behavior then .... Yes, and the day before the end (May 24) I managed to fight with a physical education teacher)))). And a week before, in the midst of a disco (at our school they’ve "played in the evening), I broke into a gym on a motorcycle and broke up everyone ...))) (True, then -" not caught - not a thief. "The helmet was closed, and the bike was brand new, no one had seen me on it yet (Grandfather gave me Izh-Orion) ... Everyone understood that it was me, but it was another motorcycle that caused doubt. Everyone was used to seeing me on the blue Sunrise))) )
... At the prom I invited the school principal to dance and admitted everything ... And about the motorcycle and much more ....
+1
Reply To quote A complaint
Khatul Madan
I did not beg
Yes, I, too, was still a schoolboy on my Wishlist, I earned on vacation, and I bought my first jeans and sneakers when I served abroad! Gift Ts-20 is like a computer for your son, an investment in your future profession! yes
+4
Reply To quote A complaint
It was better to ask!
Then I have not read M. Bulgakov’s novel “The Master and Margarita,” but I intuitively felt, “Never ask for anything, especially from those who are stronger than you, they themselves will offer and they will give everything.” I did not beg for help, especially since I really studied in triples. Yes, from the sixth grade, I stopped doing homework, as a result, work in the lesson is five, for homework is one, the arithmetic mean is three.
In general, I congratulate everyone on the upcoming, and let them come true if not dreams, then at least hopes! For all, musical congratulations.
In short, I propose a toast: For us and for hell with them!
+1
Reply To quote A complaint
Khatul Madan
I was not spoiled with such gifts, although I asked
It was better to ask! And learn just fives!
gave his son at the age of thirteen, at the beginning of the 2000s, a computer
Values ​​are changing, I was presented with a watch for the 16th anniversary, “Dawn”, 17 stones, 32 rubles, such an event was, I still keep it! yes
+3
Reply To quote A complaint
I was not spoiled with such gifts, although I asked. Now I don’t remember exactly, maybe they threw money for DR (I had it in February), but I bought it in the summer, I earned it by weeding on holidays. Remembering his story, although he got on credit, he gave his son a thirteenth birthday, at the beginning of the 2000s, as a gift from a computer. Now he is a specialist (now those who were called engineers today are so called) for computer troubles there. Probably the main thing in these matters is to understand that this is not a momentary whim.
+2
Reply To quote A complaint
Khatul Madan
the tester C-20 was the limit of my dreams and I saved for it for a long time, it cost 19 rubles
And they gave it to me for my birthday! yahoo
+2
Reply To quote A complaint
I don’t even know whether to scold or praise. First, praise, well done, that he did it himself. I did such a class for myself in the sixth, when the Ts-20 tester was the limit of my dreams and I saved for it for a long time, it cost 19 rubles.
And now the fly in the ointment: firstly, you could draw a new scale, just flip the existing one and apply the divisions there, the old scale is still not used. Secondly, the voltmeter scale could be extended, of course, making the circuit a little more complicated. And finally, there is no description of working with the probe, for example, how to determine if the battery is alive or on its last breath? (I know what needs to be checked under load, and other readers?).

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