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Questions tagged [test]

A definitive procedure that produces a test result.

13 questions with no upvoted or accepted answers
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4
votes
1answer
405 views

CMRR test methodology and effect of open loop gain

I am trying to test the CMRR of opamp and so measuring offset variation across Common mode range in unity gain mode. I have gone through many articles on CMRR measurement. All those are suggesting a ...
1
vote
1answer
156 views

How to test a capacitor?

I've got a big 560 uF, 400 V capacitor and I've tested it with a meter and the capacitance is within spec, same the ESR and it has a vloss of 0.8%. So all seems fine but then I came across this video ...
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0answers
58 views

RS485 - Comunication lost during EFT IEC 61000-4-4

I'm having throubles with communication over RS485 in harsh industrial environment. We perform test in EMC lab, acording IEC 61000-4-4 = Fast transient (also known as Burst). We used burst generator ...
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0answers
10 views

What's the best dielectric breakdown test sequence for a DPST switch?

Please could you help me to check my understanding of dielectric breakdown testing? I’m only a humble mechanical engineer so I’m a bit outside my comfort zone. A product requires dielectric ...
0
votes
1answer
246 views

Build In Self Test LCD

I've recently been trying to get a custom LCD (ET101005DSAK0) connected to an Embedded System on Module however without any success. When debugging why the LCD is not working I wanted to make use of ...
0
votes
1answer
102 views

Electronically verify whether cable is connected to RJ45 connector

Background: I have a device that interfaces with a motor controller over RS-485 via an RJ45 socket. Currently, the port is a standard 4x2 RJ45 connector with the RS-485 using pins 2 and 7 ...
0
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0answers
49 views

Suggestions for switching 800VDC converter on/off

I'm stress testing(turning them on-off with load every 300 seconds for 1-2 weeks) the components that we are willing to use. have tested several battery chargers with AC input with using a timer relay ...
0
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0answers
45 views

Is there an easy way to provoke soft errors?

So I'm mainly involved in writing firmware for industrial sensors which are expected to be very robust. One of the things you have to face are random errors everywhere, especially in ICs outside of ...
0
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0answers
331 views

How to do insulation resistance measurement on a SMPS

Can anyone explain how to measure the insulation resistance of an isolated SMPS PCB? Is it correct to tie ACL and ACN and apply one terminal there, and the second terminal goes to the ground of the ...
0
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0answers
46 views

Should I get a multimeter to check size of voltage to avoid damaging a logic analyser?

I am looking into getting a Saleae logic analyser for a project to reverse engineer an electronic display and buttons for use with a RaspberryPi. I think it should be OK as I would doubt, by my own ...
0
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0answers
61 views

Reduce amount of I/O required for automated switching

I got a device with a 16-pin connector. One of the functionality tests consists of shorting every pair of pins (the first with the second, the third with the fourth, etc.) and measuring the voltage ...
0
votes
1answer
1k views

Open circuit test on rated voltage

In transformer, the open circuit test is performed at rated voltage and frequency. why so? How both of these factors i.e voltage and frequency affects the transformer working?
-3
votes
1answer
84 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. ...