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Questions tagged [measurement]

Measurement is the assignment of numbers to objects or events. All measurements consist of three parts: magnitude, dimensions (units) and uncertainty.

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23 views

Can anyone explain dynamic gain measurement (2 tone test) to check for the memory effects in the system?

I have read in a lot of research papers concerning RF-Power Amplifiers that they tend to have memory effects. It means that the current PA output depends on the memory of the PA along with the input. ...
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1answer
30 views

Low power rectification of AC component of modulated current signal

I have a current source consisting of a 100Hz sine plus a DC offset: \$I=I_{DC}+I_{AC}\cdot\sin(2\cdot\pi\cdot 100Hz\cdot t)\$ with \$ I_{DC}\approx100uA\$ and \$I_{AC}\approx 1uA\$. I would like to ...
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46 views

Tektronix TDS3000 series max trigger rate

So I am making a testing stand for some equipment and I am using an old TDS3034C Tektronix scope for most of my measuring purposes. I've connected it to the computer via Ethernet and using PyVisa to ...
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1answer
55 views

Why footprint dimensions are to edges and not centers

Whenever I'm looking at electronic components, I regularly see footprints with this kind of thing: Dimension E seems to me to be somewhat unhelpful; rather than simply reading the centre distance (...
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1answer
234 views

ICL7107 not working on breadboard?

I am building a very simple thermometer circuit on breadboard, based around the ICL7107. The 7-segment LED display I am using is made up of 3x TOD5261BE-N displays. My intention was to make ...
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50 views

Get position along electric wire [closed]

Do you know the game called Buzzwire where the aim is to guide the grip mounted loop through the wire maze without touching the loop against the metal maze all the way to the end? is it possible to ...
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4answers
62 views

Measuring the activation time of a solenoid

I'm trying to measure the activation time of a pull-type solenoid. When the solenoid doesn't have a load connected to it, you can measure its activation time through the current it consumes. At first,...
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1answer
52 views

Differential Probe measurement and Single Ended probe measurement (Using MATH function in scope)

I am measuring the differential voltage across a resistor connected between the supply (16.5V) and the ground. Below is my Circuit. Using differential probe (Probe setting 9.96:1), when I measure, I ...
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3answers
66 views

Test grounding of wall sockets

I just had (and solved thanks SE) a problem with a wall socket where the ground contacts were malfunctional. Much of the electrical safety relies on proper grounding. As far as I can read, details for ...
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1answer
65 views

How dual gyroscopes can be used to remove gyro drift?

I need to measure yaw/heading/azimuth correctly. Now, I have done with gyro with very strong filtering and the results are very low yaw drift and even when there is perfect calibration then there is ...
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30 views

How do I measure the fluctuation of a pulsed voltage of ~1700V?

The problem: See the little sketch. Starting from a high-precision DC power supply, I pass the voltage to low-pass filter and a pulser. This pulser pulses the nominal voltage of around ~1700V down to ...
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1answer
37 views

Requirements for measuring PCIe 2.5GT eye diagram

What is suitable equipment for measuring an eye diagram of PCIe differential pairs. I would like to evaluate the signal integrity of a PCI lane RX/TX/CLK 2.5GT. What is the recommended minimum ...
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41 views

Cortex-M DWT cycle counter inconsistent measurement

I recently discovered that it's possible to use a free running counter embedded in most Cortex-M4 cores to measure the performance of a chunk of code. I'm trying it on my LPC4370, where I want to ...
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25 views

measuring wireless (inductive) power supplies

I bought an electric toothbrush with a lithium-ion battery and wireless (inductive) charger. It came with one of those air/water jet flossing accessories, which also has a lithium-ion battery and a ...
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2answers
74 views

Two different LED types: diode test on two different multimeters shows just “1”

I have two multimeters - granted, they're both the super cheap DT830B types, but slightly different models and one is straight from the packaging. I also have two bags of LEDs - bright red and bright ...
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3answers
61 views

Possible to measure output of each battery in a battery bank?

I've been working on a small project to add electrical to my utility trailer. I have two 12V 20Ah lead acid batteries wired in parallel for running a mix of lights, a winch, cameras, a ventilation ...
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1answer
47 views

To find theRMS noise voltage in a circuit, can the measured RMS voltage be subtracted from the RMS voltage of shorted probes?

I'm trying to estimate the SNR of a circuit, which includes measuring the noise power of an analog trace. Right now, I'm attempting to measure the noise with a high bandwidth scope probe, ac coupled, ...
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3answers
132 views

How does multimeter AC measurement work?

How does a digital multimeter measure AC voltage? My guess would be that the AC voltage is rectified and filtered into a DC voltage which is then measured, giving the peak voltage of the AC signal. Am ...
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33 views

Is there a way of measuring components in circuit? [duplicate]

I have some old circuit boards full of SMD components that I would like to reuse in my projects. Before going through the trouble of removing any from their old circuits, I would like to know if they ...
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1answer
26 views

Custom Test Fixture for LCR meter

I've designed and built a custom test fixture (based on Keysight's 16047A) to be able to measure multiple pin capacitors. When testing it to compare both fixtures (the custom and the original), I ...
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0answers
18 views

Hspice derivative measure

Is it possible to measure value of input voltage at a point when derivative of output voltage with respect to input voltage equals some value? P.s. The analysis done is DC. The input voltage is the ...
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22 views

Derivation of resultant standard deviation from individual standard deviation of an expression

Consider a problem: The total current \$ I=I_1 + I_2 \$ in a circuit is measured as \$ I_1=(150 \pm 1 ) A, I_2=(150 \pm 2 ) A \$ , where the limits of error are given as standard deviations , ...
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1answer
52 views

Analog input like in a PLC: Thermistor or 0-10V

Depending on the configuration, PLCs can often measure 0-10V, resistance or 0-20mA on the same set of screws. How to use the same screw terminal to measure resistance of an NTC element, voltages in ...
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1answer
38 views

What is meant by the term “baseline noise” in this context?

I came across this article about oscilloscopes. Under the figures and scope screenshots there is a term called "baseline noise". I googled but it turned out this baseline noise is used at different ...
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1answer
54 views

How to measure VSWR of a single connector?

With a 2-port VNA, I would like to characterize the performance of a single coax connector, specifically to obtain VSWR. The specific situation is an SMA connector at the end of a short section of ...
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2answers
102 views

Measuring wow and flutter of a phonographic turntable with digital equipment

Old school way to measure: 3000 or 3150 Khz test tone from test record played back through phono cartridge/preamp into wow/flutter/drift meter and for turntable that has an electronic adjustment to ...
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1answer
58 views

How to use a pressure sensor (transducer)? [closed]

I have this pair of pressure sensors that are addressable transducers. I want to use them for a project but I don´t really get how to get them to work. I´m used to the type of sensor that has 3 cables(...
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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
132 views

How to measure S11 of antenna using VNA for one port S-parameter measurement?

I have an antenna. I want to measure S-parameters of it using a network analyzer. I am not clear how to do it. Please explain. Thank you
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1answer
39 views

Contribution of solder parasitic to S parameter measurement

I have an antenna. I want to measure S-parameters of it using a network analyzer. The antenna has to be soldered to SMA cable for the measurement of S-parameters. After the calibration, will the ...
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1answer
41 views

What is the difference between residual phase noise and absolute phase noise?

Studying the characteristics of an oscillator with a phase noise analyzer, but I don't quite understand the difference between absolute and residual noise. Any help would be greatly appreciated
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28 views

How can I safely measure the output power of an RFID reader?

I want to measure the output power of a UHF RFID reader. I connected the antenna cable to one of the antenna ports of the RFID reader and to a spectrum analyzer (Hewlett Packard 8568B). There is a 10 ...
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2answers
75 views

Can I connect Analog and Digital Voltage Source together?

Is it bad if I connect the A_VDD and D_VDD Pins together if I want to use the same voltage? Or maybe I should ask: Why can I hook up different voltages other than galvanic decoupling? This is the IC I ...
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2answers
66 views

Ultracapacitor, capacitance higher than rated?

Broadening my knowledge and experience about ultracapacitors I've made a test bench that was described in here. I've used an IEC methodology to calculate the capacitance: $$ C = (I_d*t_d) / (\Delta U) ...
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1answer
29 views

Pressure sensor for breathing

Could anyone suggest the type of pressure sensor I need to measure human breath? When someone blows into the device I want to measure them blowing in and also sucking out. Could this be done with ...
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0answers
47 views

Is it possible to measure impact force using Flexible PVDF Piezoelectric Film?

If it is possible , should i use integrator circuit first to hold the signal then follow it by other signal processing signals (amplification and noise filtering ) ? , knowing that i tried to connect ...
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32 views

Measure precisely a resistance value [duplicate]

Basically, I'm tasked to study the electrical properties of different screws (all in an unspecified titanium alloy, some fully anodized, others only the head) based on previous measurements that ...
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0answers
47 views

What is a suitable hysteresis value and averaging period for a residential thermostat?

I've built a microcontroller based thermostat that I am using to control my home HVAC system. The actual programming and physical assembly has been straightforward. I'm using DS18B20 sensors, so I ...
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2answers
71 views

Higher precision with less digits?

Consider an ideal digital milliammeter (zero resistance, zero uncertainty on AD converter input) with realistic (noisy, hysteresic, etc.) AD converter output and a \$3½\$ -digit display. Often when we ...
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3answers
218 views

How do digital multimeters measure capacitance?

How do digital mulitimeters (DMM) measure capacitance through their typical 10M Ohm input/output impedance? Providing a logic level of 3.3V, attempting to measure 1F would mean a time constant of ...
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2answers
120 views

How can I get FROM and TO times of trig on measure statement of LTSPICE?

I need to measure the voltage on two signals which have a difference of phase, so in order to do the measure that I need I have to get V1 (t) and V2 (t + delay_between_signals). One way to that is by ...
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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 ...
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2answers
86 views

Task Execution time measurement on Keil for STM32F103

Is there any builtin feature available in Keil uVision to measure execution time of a function or task for STM32F103?
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1answer
49 views

Discrepancy between EMF measures

Why, using a EMF tester on a smartphone in airplane mode, do I get a very low measure (\$< 1 mG\$), whereas using some applications which exploit the phone magnetometer, I get a very high value, ...
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2answers
122 views

Vector Voltmeters vs Oscilloscopes?

I have come across some electronic engineering papers from the mid 1970's where they were testing tunable phase shifters. To measure the phase shift they used a vector voltmeter. As this is not a bit ...
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2answers
55 views

uncertainty estimation for a DMM voltage measurement

My DMM has a accuracy of 0.0030% of reading + 0.0030% of range, when the voltage range is set to 100mV. If a measurement with this DMM gives 0.1mV, then is the true input voltage between 0.1mV - 3....
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2answers
49 views

How I can simply measure interwinding capacitance in a transformer with electrostatic shield

I want to measure which is the effect of the connection of the electrostatic shield (between primary and secondary) to ground (or to neutral) in reducing the interwinding capacitance in my transformer....
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3answers
74 views

RMS power and phase angle control

We have a piece of industrial equipment using a phase angle controller (PAC), and are having some issues calculating the RMS power used by the load. Personally I am of the opinion that you measure ...
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1answer
65 views

Measure Power Consumption of Battery Charger?

I want to ask how to measure power consumption of battery (Li-On 18650) charger module (TP4056 and USB Boost) and the total power consumption, if i have this circuit: I have already know the power ...
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1answer
39 views

Current mode operation of a Source Measurement Unit (SMU)

I'm studying semiconductor parameter analyzers. In particular, I have difficulties in fully understanding the circuit in the following slide, which represents an SMU operating in I-mode (i.e., it ...