Questions tagged [test-equipment]
Anything related to test equipments such as multimeter and so on...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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....
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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How do I read the accuracy specs of a digital multimeter? [duplicate]
As above.
I'm confused with the '+xxx" after the percentage. Thanks
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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, ...
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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 "...
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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. ...
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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 ...
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Analog scales: Why do they have a metallic strip?
I have a couple of meters with analog scales and want to know why they have a shiny metallic area following the scale.
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What is this device? What is it used for?
I found this while going through some things at my grandpa's house. I believe it is used for residential wiring, but I'm not entirely sure.
It resembles a pen. The tip is spring loaded with a very ...
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Efficient discharge of capacitor voltage to 2-10 ohm DUT
I need to apply the voltage in a capacitor to a load (between 2 and 10 Ω) and need to have the most efficient and simple method to do so.
The goal is to apply power to a DUT (device under test), ...
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What does "Vpp" mean in terms of generated and measured waveforms?
I'm using a Keysight "EDUX1052G" oscilloscope (with built-in wave generator) to drive a red LED through a 470 ohm resistor. (I'm taking great care to keep the current draw on the wavegen to ...
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Viewing 100-200ns pulse on oscillocope
I've recently bought a Gould OS300 dual trace 20MHz oscilloscope.
I'm trying to view a 100ns to 200ns pulse, but I'm not sure I'm using the correct settings.
The pulse voltage goes from 3.80V to 0V so ...
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Is there any SOIC test clip with 54 pin? [closed]
I need to test this IC, which has 54 pins, without unplug it from the PCB.
So far I could not find SOIC test clip with 54 or more pins, so I was wondering if even such that test clip exists? If not, ...
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Reason for using short leads with capacitor tester?
When I was a high school freshman many moons ago, I took an electronics course. When the instructor introduced capacitors and how to test them, we used meters that had very short (3 inches or so long) ...
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What test equipment can simulate the inductive load of a DC motor?
I am working on a power supply circuit designed to drive DC motor. Currently, I am testing using the actual DC motor, but I would like to start using test equipment instead. There are several options ...
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how can I figure out if 1-3V is flowing from something using household items?
Basically what the (unconventional) question says! I don't have a voltmeter at home. How can I fashion one, or use some kind of test to determine if current is flowing? I know it's a relatively low ...
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200 Input Smart Multimeter Project
First off, thanks for taking the time to read this and help out.
Here's a quick overview of what I am trying to design. I have a break out box that has 200 female probe inputs. Each input is numbered, ...
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What are the IEC standards/certifications to look for in a DSO while making measurements pertaining analog parameters like CMRR, SNR, THD etc
I am in the process of measuring CMRR for our mixed signal system that deals with bio-signal acquisition. I am using DSOX2014A keysight entry-level oscilloscope to make measurement to derive CMRR, SNR ...