Questions tagged [test-equipment]

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

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2
votes
1answer
90 views

How to solder these tiny pogo pins?

I bought pogo pins to use for firmware uploading. So I have to make a Jig for my PCB, but this is the first time I use pogo pins. I have no ideas where I have to solder, I mean I want to know if ...
0
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0answers
57 views

Preamplifier Circuit Test

I designed a preamplifier circuit for vibration signals. the preamplifier circuit is bandpass filter with 60 db gain. I did simulations with LTSpice and I think it has good response but I want to ...
0
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1answer
47 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 ...
5
votes
1answer
253 views

How to check if my quadrature encoder is broken or not?

I have purchased some cheap quadrature incremental encoders (YUMO E6A2-CW3C) for which I have found "a" data-sheet here. Now based on my limited knowledge the quadrature incremental encoders are ...
1
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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 ...
1
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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. ...
0
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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 ...
0
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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 ...
3
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1answer
63 views

EAGLE 9.4.1 How do I autoroute a range of signals?

I have a board with three 32 input analog multiplexers, along with more components, connected to a 96 way DIN connector. How do I manually tell the autorouter to select only the muxers signals? I ...
1
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3answers
119 views

How and when does the kelvin measurament actually works?

I know that 4 - wires method uses 2 wires for driving current throught ammeter and measure current values. So, resistivity wires will be removed from the equation. Ammeter wires resistance has no ...
0
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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) ...
2
votes
1answer
87 views

How to connect to tiny pogo pins in test fixture?

I'd need to build a test fixture with very small pogo pins (1.27 mm spacing between the closest pins). I've seen fixtures before that use very long, very thin pogo pins almost exactly like this one ...
0
votes
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 ...
0
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2answers
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 ...
1
vote
1answer
110 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 ...
2
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0answers
61 views

Whats the best type of connector for test equipment? [closed]

I am selecting the components to use for a tester I am developing. I am looking at various types of board to board connectors. The requirements are: Rated to least 2A. Rated to ~200v. *High ...
3
votes
2answers
979 views

Test pad's ESD protection

I design a module with onboard test-pads. I put ESD protections to all out-world connections like sockets etc. But I want to ask that; should I put ESD protections to test-pads and ISP socket inputs?...
1
vote
1answer
46 views

Drop test with load cell: longer impulse on load cell than optically

I have been performing a simple drop test on a load cell using a golf ball, recording the impact using a Phantom camera as well as collecting the data from the load cell. The problem arises when you ...
0
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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 ...
0
votes
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 ...
0
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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 ...
0
votes
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 ...
4
votes
1answer
53 views

Diagnosing power supply issues?

I have a workstation that's becoming a little long in the tooth, as it were. It's a rock solid system, but about a year ago it had a faulty power supply that I replaced. During the past 11 or so ...
0
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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 ...
0
votes
2answers
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 ...
14
votes
1answer
1k views

What is a “universal bridge”?

I recently came across this intriguing instrument from the 1970s(?): It's a "Universal Bridge" made by Wayne Kerr. It's not a type of device I've come across before and I'm curious what these are (...
2
votes
1answer
60 views

Selecting the equipment with the optimal 10 MHz reference

In a larger testbench I have 5 synchronized instruments (signal generators, ARBs, VSAs etc). I am trying to decide which instrument to take as "master". I rule out the older/cheaper parts (Tektronix ...
2
votes
2answers
307 views

10 MHz reference distribution (daisy chaining vs. BNC tees vs something else)

10 MHz is the quasi-standard for reference clock in measurement equipment. Most boxes have "REF in" and "REF out" or "10 MHz in"/"10 MHz out". In my case, I have a measurement setup consisting of an ...
8
votes
4answers
2k views

What equipment do I need to test an eye diagram for USB?

I'd like to test USB full speed with a goal of testing high speed (480 Mbit/s), I have a tek scope that does 300 MHz (which I could upgrade to 500 MHz) and I'm looking at a 500 MHz differential probe. ...
0
votes
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 ...
-1
votes
2answers
100 views

How can I power a device under test in a way that is safe for an oscilloscope?

Is it possible to power a circuit in such a way that makes it impossible to fry my oscilloscope with a ground loop? I've heard using a battery is a good way to prevent this. Is there a other way I ...
0
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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 ...
0
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2answers
67 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 ...
-1
votes
1answer
118 views

How do I test 10-12 pF range capacitor

Here is the situation: I have few unknown 1% high precision capacitors and I know they are either 10pF or 12pF, and I have few known 12pF 1% capacitors. Q1, How can I test those unknown 10-12 pF ...
0
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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. ...
0
votes
4answers
91 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 ...
3
votes
2answers
252 views

Is there a reason that phase testers are not prevalent in the USA?

Soft question here. I grew up in Ireland where phase testers (see picture) were used to check liveness of domestic wiring. They were also convenient for checking the ignition in a car. I never see ...
0
votes
1answer
59 views

Getting Agilent USB GBIP Adapter to work with NI-Visa or R&S GBIP over USB with Agilent Visa

This Visa/IVI jungle is pretty much a desaster. Not enough that each package contains GBs or data, they also cause problems when installed in parallel (one example: https://www.mathworks.com/support/...
0
votes
1answer
37 views

How to maintain the zero potential at the connector end?

I am developing Automated Test Equipment (ATE), from the ATE, on the output connector there will be a some potential exists. How to maintain the zero potential at the connector end, which goes to ...
2
votes
1answer
40 views

Making a model of a transformer

According to this link, the equivelent circuit diagram of a transformer (seen from the secondary side) looks like: Now, I want to find the values of the following constants: $$R_p,X_p,R_c,X_m,R_s,...
1
vote
2answers
114 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 ...
0
votes
2answers
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 ...
0
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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 ...
4
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3answers
292 views

Good equipments to measure current consumption for IoT devices [closed]

I was asked to bought some equipment to measure the current consumption for the IoT devices. The company is a startup and has a limited budget for this (let's say less than 5k$). I'm looking for an ...
2
votes
1answer
102 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
votes
0answers
105 views

Viewing phase difference between two signals

I need the SPI clock and the device clock to be synchronized. I am using an Arduino (ATMega 2560) to communicate with the device. The device clock is being generated from using a timer on the Arduino (...
0
votes
3answers
128 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 ...
1
vote
2answers
468 views

Is it possible to test a MIDI device through its connector with a multimeter?

I have a Fluke 115 multimeter available that I'm hoping has capabilities to register (even with low fidelity) any MIDI signals flowing out of a handful of devices. ...
6
votes
1answer
115 views

Test fixture PCB reliability metrics?

I am working on a project for a client that involves developing a reliability test fixture that will be used for stressing the end test device (DUT). The test fixture is a PCB which has linear power ...
0
votes
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 ...