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Questions tagged [tester]

The tag has no usage guidance.

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0answers
56 views

Update Mega328 Transistor Tester with Arduino Uno micro controller

I'm trying to update Mega328 Transistor Tester with Arduino Uno micro controller. Here is my Uno and Mega328 connection and Avrdude setting, including particular error: avrdude.exe: verification ...
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3answers
140 views

“Live neutral reverse” and “hot/neu reverse” difference?

I've got a "Meterk GFCI Electric Socket Tester" that can detect "live neutral reverse" and "hot/neu reverse" cases. Meterk E2752 What could be the difference between these cases? Isn't "live" a ...
1
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1answer
29 views

Neutral leg outlet pluggable detector

For my certain 240v circuit. I want to know if there is a 2 prong pluggable tester where it can detect if one of the leg of the 240v is grounded or not. Assuming the outlet is only 2 wire. Can one ...
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1answer
27 views

Series voltage and voltage tester module

I have a question about battery tester module. I have in my hands a board that shows the capacity of a 3.7V 18650 LiPo, presumably by measuring voltage. It has 4 LEDs on it. If I hook this up to ...
0
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1answer
57 views

Can an ac signal pass from ground( earth's surface) to the socket?

My house is supplied with 230 V, 50 Hz AC signal and the sockets are three hole ones where the right is for live, left is for neutral and the above hole for ground. Now if I use a tester and put it ...
0
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1answer
68 views

Megohmmeter, Insulation tester, megger

Can anyone please explain how does megohmmeter (insulation tester) work. Here is what I don't I don't understand: These little tester can produce e.g. 1000V, how is that done? What are the internals ...
2
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1answer
90 views

Low volume mixed signal electronics production (hardware test, calibration, flashing) automation [closed]

I am designing a mixed-signal board with microcontroller that will need flash memory programming for its firmware, (self-)testing, and documentation for the final production steps. I know there is a ...
0
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1answer
139 views

Help building a CANbus receiver and sender unit

I am an engineer in the marine industry and work as a commissioning engineer and need to build something that I can connect to each sensor for alarm testing. The sensor is a thermocouple that is hard ...
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2answers
842 views

How can the test pen light up when touching your fingers that doesn't have or have very little electricity current?

I saw this video: https://youtu.be/KiJH1lgaHrY?t=1m49s (at 1:49) where the guy touched the test pen with his fingers and the test pen lights up. How could it possible? I tried that on my test pen and ...
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0answers
28 views

Microcontroller transmission on different ground points

I am designing a cable tester solution that incorporates 2 PIC MCUs ( 1 to TX & 1 to Rx). the cable in between will be quite long (Probably 30-100m) & have 10 separate conductors inside it. ...
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1answer
80 views

Resistance tester

I would need to create a simple tester with battery supply that compares resistance of specific wire with reference (approximately 4 ohms) and determines if the wanted resistance is in desired range. ...
1
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1answer
101 views

Can a modern multimeter be classified as a discrete component tester?

I work for an avionics training company where we are required to meet certain criteria with respect to the theory and practical tasks that we teach. At the moment there is one area of debate with ...
2
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1answer
85 views

A question about the current value in a mains tester

After reading this question, I simulated the tester as in the below circuit along with the current passing through human body: Even I set the R_tester to zero, the current still will be around 10μA ...
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2answers
171 views

Help Identifying a Component [closed]

I have a USB Tester like this one: https://www.amazon.com/KCX-KCX-017-Power-Capacity-Tester/dp/B00WBHQJ8W I have connected it by mistake to a 23 volt power source and the item stopped working. When ...
0
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1answer
480 views

Simple vacuum tube tester design

I recently acquired a bunch of vacuum tubes from ebay and I'm in the process of trying to design a simple tester to check the functionality. Below is what I'm currently thinking about: I managed to ...
0
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1answer
58 views

Is the series resistance of an analog ammeter the parallel equivalent of shunt resistor and resistance of galvanometer?

An analog ammeter is made by a galvanometer (with certain \$i_{max}\$ and resistance \$r\$), in parallel with a shunt resistor \$R_s\$ that depends upon the max scale chosen. Nevertheless, when an ...
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2answers
285 views

How does this continuity/mains tester detect microwave RF?

This tester can detect leakage from microwave oven above a certain value (among its other uses). It has only resistor, transistor (darlington), LED and two batteries. As far as I understand, it can ...
3
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1answer
1k views

How do you test SMD ICs that are not soldered to a PCB?

To be more specific, let's say I have SOP16 SMD chips that have been purchased from overseas. I have several PCBs that they need to be soldered to, but I don't want to risk paying for assembly and ...
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2answers
3k views

How do I test a USB drive to be sure it is not a “USB killer”

I have recently read of a dangerous USB drive containing a circuit instead of storage, that destroys the hardware of a computer by injecting a high voltage, high current pulse into the port it is ...
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1answer
2k views

Why can't we test return neutral current with a tester? [closed]

The current that a load takes up comes into it from the live and returns through the neutral. We know that. We test a live wire by touching it with a tester in one hand and being in contact with the ...
1
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1answer
8k views

How to test capacitors of non working circuit board using capacitor meter?

I bought broken sega megadrive 2 clone console. Something wrong with 7805 IC supply (I changed to another, but no result). But now I want test electrolitic capacitors and resistors, because I thing ...
6
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2answers
4k views

Can electric bulbs be powered by connecting the negative terminal to earth?

I have a very fundamental question, will an electric bulb glow with one point connected to the positive terminal of the electric line and the other point to earth? In my school some 10 years back I ...
3
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1answer
126 views

What is a Reacto Tester unit and are there any projects in which I can use it?

I was given an old piece of electronics. It is a Reacto Tester made by Antronic Corp from Chicago. After a quick glance at the manual it seems that its a tester for tube display units such as ...
4
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2answers
146 views

Proper Component Testing (Specifically Resistors)

What is the best practice for testing small components such as resistors / capacitors before shipping? I buy these in bulk, and while it is easy to catch the duds that have already failed, sometimes ...
4
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2answers
7k views

Short circuit test on long coaxial cables

In a building infrastructure there is coaxial cables for TV. The first end of all the cables is on the roof. The second end for each cable is in different apartment. The problem is that I don't know ...
0
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1answer
524 views

Op-Amp tester on LM4250

So I have found this Op-Amp tester on Google here link and while it works on a 741 it doesn't on my LM4250 (Programmable operational amplifier). Is this supposed to work on any op-amp or have I just ...
10
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3answers
3k views

How does this continuity/mains tester work?

Many years ago I bought this screwdriver, the instruction sheet (which I have mislaid) claimed you could use it for a surprising number of tasks: Continuity of fuses Mains voltage present (barrel ...