Questions tagged [test-equipment]

Anything related to test equipments such as multimeter and so on...

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78 views

What are the advantages of a internal high-precision oscilator over an external one

Many lab measurement equipment for analog, radiou and RF purposes, such as frequency counters, arbitrary signal generators, oscilloscopes, etc. have the option to input an external reference clock (...
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2answers
2k views

How to check if there is electric current on material surface?

If there is electric current on a material surface (but not an obvious thing like outlet hole or such), what is the best tool to check it ? Is it possible to use multimeter? Example case: There is a ...
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1answer
84 views

What is the purpose of external terminals on a logic probe?

I have an LP-3500 logic probe. In addition to the normal connectors to power and ground at the bottom, it comes with two external terminals (one red, one black), which can be connected on the side ...
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54 views

Why is there need for both functional validation and LBIST during Post-Silicon?

In Post-silicon testing, we have a functional validation testing where C tests are developed to verify the functionality of the SoC, through a JTAG interface connected to the PCB TAP and controlled ...
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4answers
3k views

What kind of wire connectors are these? [duplicate]

The loop ones. I've never seen them before.
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2answers
290 views

How do I test my gloves for ESD?

There is a lot of fake products in the market, and sometimes the original products fail to protect electronic components from ESD. My question is how do I test my gloves "with simple equipment" if it ...
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4answers
118 views

Getting 240VAC output from 220-230VAC input

For lab testing at work I need to be able to test an appliance (often more than 3KW, e.g. deep fryers and waffle irons) at 240VAC. The problem is that our power grid only provides between 220 and 230 ...
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1answer
3k views

How to check if an IC is fried?

I was using my 74173 (d-type register) today and accidentally attached the vcc pin to ground and the ground pin to 5v. I didn't realize this and turned on the power. A couple seconds after turning ...
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1answer
138 views

why are ICT machines so expensive? [closed]

For example, take the HP/Agilent/Keysight i3070 ICT machine... why are there so many custom chips on in it? Couldn't the same thing be done with off the shelf FPGAs/opamps and relays? The tests it ...
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1answer
266 views

Why doesn't a passive x1000 oscilloscope probe have 1000M Ohm impedance?

Most of the x1000 high-voltage oscilloscope probes I find seem to have input impedance around 100M Ohm. For example the P6015A from Tektronix (100M Ohm) or the PPE6KV from LeCroy (50M Ohm) or these ...
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1answer
184 views

Test an LCD for missing segments without looking at the screen? [closed]

I have a product with an LCD screen that sometimes fails with missing segments. I will test the product for a long time to replicate the failure. I will test many at once. I don't want to sit watching ...
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1answer
117 views

Circuit or Equipment to delay high speed square clock signal?

Hi I have a ttl clock signal that id like to change the phase of to see if it changes effects the unit under test (not relevant but its a digital transmitter and an automated testing setup) this way I ...
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0answers
112 views

Equipment to measure strong constant (in time) and slowly changing electric fields

I would like to measure the electric field in the vicinity of an object of interest. I would like to have decent spatial resolution (i.e. be able to pinpoint a measurement to a point in space within ...
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3answers
278 views

Why does this guide recommend a 500MHz oscilloscope for power supply testing?

EDN have an interesting (for novices like myself!) guide on testing a power supply's design, in which they suggest a 500MHz oscilloscope as one piece of equipment necessary for "proper" testing: ...
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2answers
136 views

How practical are Test Sockets?

I've been looking at getting a Test Socket as of late to try and test out a bunch of old micro controllers on dead boards. However, these test sockets are very expensive when compared to their PCB-...
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3answers
184 views

Why does microwave test equipment use N connectors?

Almost all of the microwave test equipment I've ever seen and used has N connectors, with exception of some scopes that use either custom fancy BNCs (keysight does/used to do this)) or SMA. ...
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0answers
28 views

Common rectifier (or source) to power testing equipments

I was thinking of a design of an all-in-one box that contains a DIY Oscilloscope, a DIY frequency generator, a DIY bench-top power supply (by a buck converter), and a multimeter (broken out from the ...
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58 views

Design approach for small, portable non-contact thermal measurements

I'm looking for ideas and suggestions for putting together a small, non-contact thermal measuring device for finding hot spots on a circuit board. It needs to be small enough that I can toss it into ...
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1answer
66 views

Designing a high frequency amplifier and needing an oscilloscope

I need an oscilloscope to bench test an amplifier I've building. I haven't got any. I thought If I limit it to 20kHz, it can be used as a sound amplifier. Would simply judging by the sound be enough ...
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1answer
136 views

pcb/trace corrosion testing

My company has some plastic enclosures with circuit boards inside. The board has been exposed to corrosion, which we will repair and test for continuity and current. Is there a test that can test ...
2
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1answer
89 views

What is this AC power connector for a Hughes TWTA?

I've been picking up some microwave power equipment off of eBay recently and ended up with a Hughes TWTA (1277H04, 20W in the Ku band) on the cheap. Unfortunately it did not come with a power cable ...
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2answers
709 views

Voltage Spike/Noise due to Switching

I am currently looking over a PCB and performing a spike check on the device of interest. The device itself has a 7V maximum rating on a pin and I am seeing a strange behavior resulting in a 17-18V ...
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0answers
52 views

MEMS or other modern component electroscopes

I was looking for a component-style electroscope. I thought, "Surely there must be some MEMS-based electroscopes capable of 2- or 3-significant-figure potential measurements." But the only thing ...
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1answer
134 views

60335-1 27.5 Test - Am I doing this right?

I work at company producing household appliances, and I'm looking into a way to test compliance with part 27.5 of the NEN-EN-IEC 60335-1 standard (which is derived from IEC 60335-1). It states (...
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0answers
60 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 ...
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1answer
114 views

How can I properly test compatibility of a replacement led on a pcb?

I am looking to replace an led on this board, but I am unsure of what this current led's specs are in terms of what amperage and voltage are used by the led. I am curious what ways I can test to make ...
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3answers
135 views

How can I tell if my building plumbing provides an adequate ground?

I work in an old building with two-wire wiring, i.e. no separate ground. Is there some minimum-equipment-purchase way to tell if a wire soldered to a building plumbing pipe is an adequate ground? I ...
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3answers
164 views

What general equipment is needed to 'explore' circuits? [closed]

I'm new to circuit design and I want to start using some equipment to analyze some circuits I have to see how they work. Right now all I have is a multi-meter, a JTAG SAM/AVR programmer, a 5 Volt ...
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1answer
150 views

Cheap alternative to 3M IC clips?

I'd like to connect my logic analyzer to the address and data lines of a 6264 parallel SRAM chip on a PCB I'm working on. It's a 28-pin, .600 mil DIP package. I have a 3M test clip for a .300 mil ...
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1answer
4k views

Testing an X2 capacitor with a capacimeter. Is it broken?

This came up as a comment in other question I posted, but I thought it could be of use for someone else if posted separately. I have an X2 cap rated ".47K275V~X2". Is that ...
2
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1answer
133 views

output protection of testing equipment

I have testing equipment for testing PCBs. It consist of a PSU, Digital IO (48), ADC(96), communication ports and programmers. This question is about making the 48ch digital output module foolproof. ...
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2answers
223 views

Step Generator Reset Circuit Alternatives

I'm working (slowly) on a project to build a curve tracer based largely on the Heathkit original (Heathkit Catelogue - IT-1121) and I've come up against an issue in the step generating circuit. The ...
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2answers
545 views

Discharging 100 A battery

I want to discharge a lead acid battery of 12 V having a capacity of 100 Ah for 20 hours. 100 Ah divided by 20 hours = 5 A 12 V divided by 5 A = 2.4 ohms Is my formula ...
2
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2answers
100 views

RF Emissions Testing and Discovery of Hidden Undocumented RF Device

I would like to know is it possible to induce RF emissions (incidental waves (re-radiation) from a RF device that is not transmitting ? The purpose of this testing is discover whether there is a ...
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1answer
166 views

Practical LabVIEW-free Keithley 2400 front-end for Linux?

Is there a high quality LabVIEW-free gui/interface/front-end to communicate with Keithley 2400 on Linux? Not just for single measurements, but also for various sweeps for practical daily use?
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2answers
487 views

Curve Tracer Power Supply Puzzle

On my continuing odyssey to analyze real-life circuits as a way to expand my knowledge, I'm studying this Heathkit Curve Tracer: IT-1121 Curve Tracer Schematic There are a couple of features about ...
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2answers
4k views

Is my K-type thermocouple defective, or am I using it wrong?

I have two K-type thermocouples that look exactly like the one below. One was sold as good to 800C, and the other was quoted as having a temperature range from 0-400C. I have been swapping them ...
2
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1answer
240 views

RF generator TX antenna with low impedance can damage generator?

I got an RF generator R&S HAMEG HM8135 that I use in a testsystem to generate FM and AM stimuli in order to check if FM antenna and AM antenna is correctly mounted on the testobject in a ...
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1answer
126 views

What is “mains outlet tester” (for proper wiring) in the context of US power connector standard?

I'm curious about this comment. It says what ... in the US or UK you should be able to go to a hardware store and buy an outlet tester for very little money. This is a little plastic housing ...
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2answers
707 views

What is the general operating principle of an AC Electronic Load?

I'm working my way through electromagnetics and in particular power (line) transformers at the moment. I'd like to be able to run tests of various kinds at different AC loads and possibly at different ...
1
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1answer
40 views

Which instrument for arbitrary signal commutation (matrix)

I would like to test a bunch of sensors. Each sensor has a DB15 connector with mixed digital and analog signals (bw ~5MHz, Z ~120R). I am looking for an instrument where I can control which couple ...
3
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1answer
747 views

Why does inserting a resistance in the common of my scope probe cause it to pick up AC noise so much worse?

I'm poking at the inside of a USB oscilloscope, with the hope of modifying it so that the scope probe commons can be referenced to different voltages. When I use my USB oscilloscope to measure a 24V ...
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4answers
320 views

What kind of microscope is used to see the electronic flow on a microchip?

I've found an image, where anybody can see the electron flux on an active microchip (especially the conducting-path's). It's pretty amazing to see such electric flow and so I would like to know what ...
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2answers
2k views

Finding out the length of a cat6 cable

I noticed this tester had precise length readings of short cables. I decided to plug a very long cable (almost a full pack) and was surprised to see it still gives a reading. 232 meters: Adding the ...
3
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1answer
1k views

I need an amp meter that requires no splitting of the wires

I need to measure the amperes of the current flowing through a cable; the power is consumed by an electric motor. For that purpose, I am looking for an amperemeter that requires no splitting of the ...
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1answer
4k views

What resistance/ load do battery testers (AA or AAA) use in Ohms please

Trying to find out what size resistors (Ohms) a AA or AAA battery tester would use? Have tried searching but unable to find an answer I meant testing alkaline and ni-mh 1.5volt and 1.2 volt batteries ...
2
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2answers
360 views

How can I objectively compare TCXO performance?

I would like to evaluate an alternate TCXO used in a GPS receiver circuit. Our current TCXO works good but I'm looking to test a lower cost alternate. The alternate part is Epson TG - 5035CJ / CG / ...
3
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1answer
94 views

How to test/flash many modules?

Suppose I have several hundred pieces of the same module to test and flash, and the connectors themselves have wire holes in them like below. What's a good way to make the connection without soldering?...
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2answers
985 views

nichrome alternatives

I am repairing an AVO multiminor Mk 4 which was in a sort circuit across a car battery while in the 1 amp measuring position. circuit diagram here an obvious casualty was the 0.25 ohm resistance R1 ...
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1answer
545 views

Are old frequency counters good deals or a waste of money?

Other than knowing that you get the best results from a frequency counter by using a high quality crystal, like an oven crystal, I don't know too much about a frequency counters. I notice that you ...