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Questions tagged [test-equipment]

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

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I'd like to ask you a question to solve the star fever problem [closed]

I made a visual aid device, but when I use the device, the heat rises little by little, so if I keep using it, the device gets hot, so how can I solve this problem? It is difficult to change the ...
김강준's user avatar
0 votes
1 answer
70 views

Transistor withstand voltage tester

There are some cheap transistor withstand voltage testers around. Aliexpress and eBay are full of them for under $20. I guess the principle is that the tester increases the voltage (with current ...
Chupacabras's user avatar
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1 vote
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56 views

How to debug a noisy oscilloscope

I've had an inexpensive handheld integrated digital oscilloscope for close to a year, and used it well on various projects. It's been on the shelf for 6 months, and the signal I get now is very noisy,...
SRobertJames's user avatar
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2 votes
4 answers
61 views

What do you call 'modules' used in ATE equipment for DMM type measurements?

I need to build a simple piece of automated test equipment, and need to perform a simple 2 wire resistance measurement in multiple points using a bed of nails fixture, and buying something like a ...
mountainred's user avatar
1 vote
1 answer
54 views

How does a socket grounding tester work?

I'm curious about how socket grounding testers like these work: https://www.amazon.com/Amprobe-ST-102B-Socket-Tester-GFCI/dp/B008E07HM2/. I'm also curious about what kind of false positives they could ...
Jasper Siepkes's user avatar
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1 answer
48 views

How many independent test transceiver modules are truly required for MIMO testing?

In most if not all of the app notes I have ever seen from the major test equipment vendors, such as R&S and Keysight, it is strongly implied if not explicitly stated that in order to do an NxN ...
user12345's user avatar
0 votes
1 answer
55 views

What model or brand, for test equipment of lots of IO's [closed]

Can someone give me a type or a brand of test equipment. I need something bigger and possibly faster than what I am currently using which is : test 8 pcb's and simulate a machine all at the same time ...
Mike More's user avatar
4 votes
2 answers
300 views

Can I test the EM shielding of a material with a spectrum analyzer?

I am a hobbyist and I am intersted in testing some materials for their ability of reflectance/absorbance/transmittance for microwave radiation and I want to know if a spectrum analyzer is suitable ...
Tintin's user avatar
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0 answers
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RF verification for SIMCOM7070 modem

We have a custom board featuring a SIM7070 modem with two SMA connectors for GSM and GPS. After fabrication, the boards are passed through some basic tests to check if the device can operate as ...
BvLeeuwen's user avatar
1 vote
1 answer
126 views

Interfacing with a Tektronix TBS2074B using PyVisa and SCPI commands - Timeout issue

I have a script for capturing waveform data via USB, that at one point in time was working appropriately. However, recently it stopped working and multiple things/settings were changed making it hard ...
Cemetery_Gates's user avatar
2 votes
4 answers
138 views

Is it possible to generate signal consisting of a sequence of sinusoidal bursts at different frequencies with a signal generator?

I need to generate a signal that looks like this: at first a sine wave of frequency \$f_{in} \approx 1 MHz\$ that goes on for \$N\$ cycles (\$N\$ could be in the range 1-10), then staying at 0 V for a ...
Adrian's user avatar
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Waveform Generator Ripple on Pos. Sine Crest

Acquired a used GW Instek 8020H. During cursory testing, it was found to have excessive ripple at the positive crest, along with very minimal ripple at the negative crest. This ripple appears also ...
ITPhoenix's user avatar
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1 vote
1 answer
50 views

Can you calibrate your VNA to show matching circuit behavior, without the antenna connected?

We need to make a matching circuit for an antenna, but the antenna feed point is in an inconvenient location. Is there a way to calibrate the VNA at the feed point such that the VNA will show the ...
KJ7LNW's user avatar
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1 vote
0 answers
59 views

Earth Resistivity Test on concrete base

I am planning to conduct an Earth Resistivity Test on my property. The issue is that my building's basement is entirely covered with concrete and pavement, and we intended to use the Fall-of-Potential ...
IT Researcher143's user avatar
1 vote
0 answers
117 views

How does an SMU change its output impedance from current source mode to voltage source mode?

The above three figures are from the Keithley 237 SMU service manual. From my understanding, the system is configured as a famous two OPAMP precision current-pump topology (shown here). Although I ...
Emm386's user avatar
  • 607
0 votes
1 answer
146 views

Feedback and opamp

Consider: Attached schematic is from a broken sampling scope that I have in the lab. Cathode of D1 is connected to a sampling gate output, which is sealed in a metal cage. U5 (top right) is the ...
Emm386's user avatar
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0 votes
1 answer
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How do you choose the right load for reliability testing?

I am an automotive reliability and test engineer. I do environmental or electrical tests and during these tests I need to load my products. By load I mean, for example, there is a mosfet driven by a ...
Taha Füzün's user avatar
2 votes
1 answer
69 views

Found a component written 'RCs' on the package. What is this component?

While I was tearing down a broken sampling scope in the lab, I found two of 'RCs' components in the sampling scope head module. I tried to look up the information about this component, but couldn't ...
Emm386's user avatar
  • 607
0 votes
1 answer
111 views

Inrush problem while using a isolated DC lab power supply

I'm puzzled by an issue I've been observing during my testing of H-bridge buck converter. I'm using 2 lab bench DC PSU such as E3630 (Keysigh)t to supply ISOLATED 5V to a driver. When I power up the ...
penguineering's user avatar
2 votes
4 answers
299 views

Multimeter blown trying to measure 125 V in the 600 V AC range

I used a multimeter in its 600 V AC range to measure the voltage across a socket of a surge protector that is rated 125 V - 5A. As soon as I inserted the test leads, there was a pop and a bright flash....
Dat_Derpy_Dude81's user avatar
0 votes
1 answer
123 views

Synchronizing signal generators with shared LO

I'm currently trying to test my ADC chip using two signal generators. Below figure visually illustrates how the test setup would look like: The traditional approach uses a 10 MHz reference port to ...
Emm386's user avatar
  • 607
1 vote
1 answer
99 views

Screw Terminal Test Clip

I have a board fitted with a 10-way 3.5mm screw terminal in a similar style to what you see here (GSO14V-3.5): I am after a reliable contact to four of these points for testing purposes, without ...
Sam's user avatar
  • 11
0 votes
2 answers
340 views

When calibrating a VNA, does the feedline length matter?

We need to measure an antenna feedpoint (to record an .S1P file) that is far away from the VNA. We can calibrate the VNA to the feedline that will ultimately be attached to the antenna before it goes ...
KJ7LNW's user avatar
  • 2,190
0 votes
1 answer
671 views

How do lab bench power supplies have a separate earth pin and a ground pin?

I understand the use cases for having a separate earth pin and ground pin, but what I am wondering is how exactly this is achieved. Specifically, I am wondering at what part of the circuit this occurs ...
mm3psych0sis's user avatar
0 votes
2 answers
140 views

Greenhorn seeking oscilloscope advice

Let me make clear that I am at the crawling stage of "hobby" electronics. I plan to build and tinker with analog stereo amplifiers, speaker crossovers, etc. (though who knows where anything ...
DrSmokeWrench's user avatar
1 vote
2 answers
354 views

AC current limiting for testing an AC circuit

I am planning to test an AC circuit which I am repairing (the circuit has a short). I want to slowly bring the power up to identify which component is shorting. I purchased a Variac, so that I can ...
Nick Bolton's user avatar
  • 2,113
0 votes
2 answers
81 views

Name of test tool and where to find it [closed]

I have found myself in a situation where I need to test some components, among them some dimmer switches and wall outlets. But I have quickly been hampered by my complete lack of experience. I am ...
Martin Nielsen's user avatar
0 votes
1 answer
78 views

Very, very sensitive (but possibly very inaccurate) method of detecting voltage differences

I have a test setup where I need to be able to tell if there is a voltage differential between 2 nodes, but not affect the circuit at all. Some would suggest to using the voltmeter function in a ...
Tempus Nomen's user avatar
0 votes
1 answer
288 views

Resistor decade box

I need to assemble a high precision resistor decade box. Among the reason is that 2 of them creates a very reliable voltage divider & that goes along with my plan someday to put together a ppm ...
Tempus Nomen's user avatar
0 votes
1 answer
162 views

Getting this common crystal tester to measure very high frequency crystals, resonators & oscillators

So these common crystal tester types have 50MHz as their frequency counting ceiling. How do I make them be able to measure the fastest crystals, resonators & oscillators (the latter two going up ...
Tempus Nomen's user avatar
0 votes
0 answers
315 views

What attenuator to use for using HackRF one to simulate GPS for in production testing?

I am trying to use the HackRF One to simulate GPS to test devices in a production environment. I am currently able to get the GPS signal on my GPS receiver that I am testing, but the signal is much ...
mgwalker95's user avatar
0 votes
0 answers
190 views

Reverse engineering this very common component tester

I'm talking about this common variety of component testers here. Here's my goal: To extend it so it can properly identify MOSFETs & IGBTs even if the threshold voltage is higher than 5V. I was ...
Tempus Nomen's user avatar
1 vote
1 answer
1k views

How do I read the accuracy specs of a digital multimeter? [duplicate]

As above. I'm confused with the '+xxx" after the percentage. Thanks
mrjayviper's user avatar
2 votes
2 answers
125 views

Can insulation resistance be properly measured at low voltages such as 20 V?

I'm attempting to better understand the process of measuring insulation resistance. As you will infer, I am not at all familiar with this measurement. We have a connector prototype that we have ...
JYelton's user avatar
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3 votes
5 answers
2k views

Is there any straightforward I2C device tester?

I work with a few I2C sensors such the MAX30102. At this point, the only way to test my sensors is building a minimum Arduino setup and get the I2C sensor's reading. I am using a low-cost device like ...
Allan Xu's user avatar
  • 289
4 votes
1 answer
397 views

Combine uncertainty of multiple measurement instruments

I'm currently working on a project where I'm trying to figure out if there exists a significant difference between measurement instruments for RF power measurements. I will measure multiple Bluetooth ...
user294957's user avatar
-1 votes
1 answer
89 views

Is my spectrum analyser defective?

I recently acquired a DSA815-TG which comes with a tracking generator option. I currently don't have coax because I am in the process of ordering. So I decided to just use a thin 13 cm wire to connect ...
Dylan Muller's user avatar
0 votes
1 answer
928 views

How to check if a 4-pin button is burnt out?

I was soldering a circuit with a 4-pin button in it and was trying to find a janky connection. I had the button output displayed via serial terminal (since the circuit used an Arduino) while I was ...
Rena W's user avatar
  • 123
3 votes
2 answers
126 views

What is the name of this HV test measuring setup?

There is a measuring setup similar to the following photo in our laboratory which belongs to PASSON VILLA company. What is the engineering name of this device and how can I find a catalog or something?...
WeTech's user avatar
  • 735
0 votes
0 answers
65 views

Automated Hardware/Software Test

I am an Electrical Engineer and I don’t have a strong Software Engineering background. My problem is: I need to test several Smart home devices. For example: a door that opens and closes (also 2 ...
Caio Miguel's user avatar
0 votes
0 answers
189 views

Method for building a test fixture for the 4294A impedance analyzer?

I have an Agilent 4294A, a 40Hz-110MHz impedance analyzer, but no test fixtures to use. Unfortunately the official test fixtures are out of my price range so I need to build some. After reading ...
soup's user avatar
  • 105
1 vote
0 answers
76 views

Can I connect low-power resistors to achieve a high-power resistive load?

I've designed an 80 W 400 V PFC boost converter and I want to test it with resistive load. but I couldn't find a low-cost high power (20 to 80 watts) resistor in the range of 2k to 10k ohm. Is there ...
WeTech's user avatar
  • 735
0 votes
3 answers
635 views

Best socket for 2mm multimeter probe

I'm looking for a 2mm jack suitable for plugging a multimeter probe into (the probe end of the cable, not the meter end). I believe a 2mm banana jack would work and I've narrowed things down to two ...
Alex Hajnal's user avatar
  • 1,354
1 vote
0 answers
67 views

How to protect measurement equipment channels from ESD?

I was wondering what is the best way to protect measurement equipment, when handling like oscilloscopes/spectrum analyzers/Vnas/sensitive circuits (especially when stored in (none esd) foam)? I was ...
ulix's user avatar
  • 183
2 votes
0 answers
152 views

What is the name of this huge high-power test equipment?

It seems very old, maybe more than 50 years, and it doesn't have an information plate.
WeTech's user avatar
  • 735
0 votes
1 answer
118 views

How do you build a spurious emissions test rig?

Naively, it seems like you could test for spurious emissions by: Placing the device-under-test (DUT) in a grounded metal box with a broadband antenna inside. Hook the antenna's coax cable to the S21 ...
KJ7LNW's user avatar
  • 2,190
0 votes
2 answers
75 views

How do you build an RF device-under-test rig to create your own touchstone (s2p) files with a VNA, de-embedded to pins?

Can you calibrate a VNA to the pins of just any (low-power or passive) component and then generate an S2P to optimize an impedance match with RF simulation software to do whatever you want? If so, ...
KJ7LNW's user avatar
  • 2,190
0 votes
0 answers
492 views

Testing 16K SRAM in TL866 II Plus?

I have a GoldStar GM76C28A-10 16K (2048 x 8) SRAM DIP chip that I want to test in my TL866 II Plus. I don't see this chip in the list of known chips in the Xgpro v11.60 software and none of the "...
Zhro's user avatar
  • 2,885
0 votes
0 answers
209 views

What pitch is 14-pin header adapter

the device PCB have serial console port header and 14-pins test points right next it. It marked as J303, J304. The device processor is MIPs based, so I assume that could be a 14-pins MIPS JTAG header. ...
fxgreen's user avatar
  • 191
0 votes
0 answers
179 views

Measuring extremely small inductance (pH) with transient pulse response

I've made an inductor device. It has 2 terminals. It has inductance, resistance, and some parallel interwinding capacitance. I am using a Keysight B1500a semiconductor probe station, which has ...
Max W's user avatar
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