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Questions tagged [test-equipment]

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

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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 ...
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1answer
62 views

What is an impedance bridge?

Today, I saw a very old historical piece of lab equipment at the university. It had a large number of dials, although not as large as you would see in an oscilloscope. The size was similar to an ...
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1answer
31 views

How to route current for ATE?

I have many test points on a board, a small DAQ, and an SMU that I can program with LabView. Depending on the test, I need to change which test point the SMU is sending/measuring voltage or current. ...
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2answers
117 views

Looking for multi-channel event counter IC to verify switch operation

As part of a project, I'd like to test the correct operation of a set of SPST switch ICs (maybe 8 or 16 or so). Each device contains six independent switches, and they are controlled through an SPI ...
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2answers
1k 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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2answers
304 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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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 ...
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2answers
1k 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
112 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
115 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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2answers
714 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 ...
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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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121 views

Does polarity of scope probe matter when measuring ripple of the power supply module?

Measuring ripple of 28V/12V power supply module across +/- output pins. Does the probe tip have to be placed at +pin and probe gnd to -pin, or it can be reversed? Having inverted readings when ...
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144 views

What should I buy to test whether my DC power supplies are able to provide their rated power? [closed]

I recently bought an aftermarket AC-DC power supply for a laptop which was woefully defective. When connected to a Chromebox, a boot message appeared indicating that the supply could not provide ...
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1answer
2k views

Multimeter shows OL or 0.00 or 1.00. What's wrong?

I've got a UNI-T UT33D multimeter that's not working like I want it to, and I'm not sure how to find out what's wrong or if it's salvageable or not. The unit is new, but may possibly have had its ...
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53 views

How to synchronize two different precision measurement instruments?

I am trying to design a turbidity detector and this has to be sensitive to tiniest amounts of contamination present in a sample fluid. My setup consists of a 780nm laser whose current I control with ...
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3answers
131 views

how much ADC noise adds to signal? [closed]

(I've reworded this question from earlier) I ground the input of an ADC that has 50 Ohms internal termination, and observe a noise waveform. I measure the RMS voltage of this waveform. Then I ...
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3answers
165 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
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
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 ...
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2answers
45 views

DC test equipment to see voltage extremes? [closed]

I want to experiment with magnets and coils to produce voltage. I need test equipment to find the highest positive voltages and the lowest negative voltages obtained during tests. My needle driven ...
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2answers
3k views

Manually test computer Ethernet port with a multimeter

I have updated the drivers for the ethernet port an a laptop at home, yet it is only letting 10 mbps through for every cable that is connected, even though Speed/Duplex was set to Dual 1 Gb. I now ...
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3answers
79 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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727 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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1answer
113 views

Whats the cheapest protection circuit for this test equipment?

I am designing a piece of test equipment that has a DAC output. The test equipment might be used to troubleshoot UUTs that are damaged or malfunctioning. Therefore I want to add a protection circuit ...
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1answer
129 views

CE certification

One of the required CE test technical files is "Test Reports". This document has to be provided to the test agency. Does anyone know what data should be included in this document? Here are the ...
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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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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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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
139 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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1answer
151 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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2answers
228 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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1answer
48 views

What are the general guidelines to conduct a stress test for an assembled PCB to test reliability after fabrication?

I got a PCB fabricated from a board-house. The PCB contains: DC-DC power circuit protection diodes Atmel ATtiny microcontroller LED's USB hub and interface to a RPi I want to conduct a stress test ...
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1answer
62 views

What physical tool to use to quickly dump firmware?

Recently, I managed to take a dump of the firmware and write a modified one using the pins that I marked with red by soldering 4 thin wires to those points. Now, I needed to perform this more than 50 ...
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4answers
92 views

Isolation with inverter

Say I used a 12v car inverter powered by a 12v brick connected to ac mains (no ground pin) to isolate a scope and bench dmm, the inverter has no earth ground. Is the equipment isolated? Is lack of ...
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1answer
73 views

testing no leads packages for pin to PCB pad connectivity

After having spent 4 hours to hot air solder, multimeter probe, apply flux around the sort circuiting pads, re- hot air, re- probe and finally apply wick & iron to get rid of those shorts I am now ...
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1answer
189 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
139 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 ...
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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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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 ...
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1answer
167 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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3answers
473 views

Looking for test leads for individual PCB header pins or socket pins

While recently debugging a device that had a 7-pin male XLR plug, I was trying to connect to two of the pins in the plug, without touching any of the others, and I wondered if there are test leads ...
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1answer
48 views

Use a TVS device to protect meter from live capacitors, workable or not?

I've been working on a LCR/Impedence meter and want to protect my inputs from possible damage if I forget to discharge a large cap. I know I've seen various types of diodes and relays used for that ...
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1answer
50 views

Easy way to probe signals on a multi-conductor cable?

I have a device that I need to reverse-engineer. This device has a large multi-conductor cable -- over 20 wires that are jacketed into two circular bundles. I'll need to look at all these signals with ...
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0answers
30 views

What test points to do for a switching system measurements?

I am working on a high-performance switching system. I the old ones there was no big issue in just touching a gate with an oscilloscope probe, but this time I have high voltage and very short (5nsec) ...
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1answer
71 views

Voltage tester pens

This is my first post here so please have patience with me: I understand, there are at least two kinds: a direct contact tester which basically is a neonnlight, and a resistor a non contact AC meter ...
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1answer
42 views

Mixed equipment grounding

I have built an analog circuit PCB that I want to debug. It has to get a bipolar power +-5V and an input sinus signal. The signal on the CUT (circuit under test), has buffered inputs (but a common ...
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0answers
37 views

How to properly measure signal power with FSW signal analyzer

I am using a R&S FSW Vector Signal Analyzer as RF capturing device (using the IQ Analyzer mode and transfering IQ data via SCPI). In lack of a powermeter I also want to use it to measure the ...
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2answers
68 views

Question about a trigger input of a modern ARB/VSG (Vector Signal Generator)

Given a common setup: The green box is a PCB mainly consisting of a data acquisition device (ADC+RF frontend) which is controlled by a Spartan-6 FPGA. The ADC & FPGA use a clock from a Tektronix ...
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0answers
35 views

2x GPIB via USB Adapter

I have 2 of the normal Agilent E3646A power supplies and an Agilent GPIB/USB adapter. All 3 devices have different GPIB addresses and the two supplies are connected together with a GPIB cable. ...