Questions tagged [measurement]
Measurement is the assignment of numbers to objects or events. All measurements consist of three parts: magnitude, dimensions (units) and uncertainty.
1,173 questions
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Keysight N6700C measures wrong voltage using SCPI commands
I have a N6700C connected to a test setup where I need to measure some voltages on an analog testpoint on a circuit. I am controlling the SMU by SCPI commands. This is the sequence:
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Scope: how to measure fast (1 µs rise time) signals at high (320 V) voltages?
Short version:
How to measure fast signals (around 1µs rise times) at voltages too high to have the fingers anywhere nearby (320 V)?
How to attach scope probes without having long wire/loops that ...
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DC parameter measurement of N-type negative resistance
I have a resonant tunneling diode (RTD) and I would like to measure its I-V curve. However, it is well known that the diode would oscillate inside the negative resistance region and would be ...
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Can USB-C be used as a differential RF interconnect for VNA measurements?
I am currently performing differential S-parameter measurements using a VNA.
The current setup is roughly as follows:
the VNA feeds a routing / switching matrix, then the output of the matrix goes ...
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How precise is a DVM input impedance for high-Z circuit measurements?
I'm building a resistive probe using four 10 megaohms resistors to measure the output of a high impedance (> 2Meg)/high voltage bias supply without loading it too much. The idea is that the jury-...
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How to measure audio frequency distortion without expensive equipment?
I'm building some BJT amplifiers, and I'm currently getting distortion values via Multisim simulations. However, I'm not fully sure about the results I've been getting, and I would like to double ...
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BM2257 Multimeter - Significant-measurement in Auto-Hold Function
I have the BM2257 Multimeter and in the manual on page 15 on the AutoHold function it writes the below about Significant-measurements (readings).
What does "Significant-measurement" mean?
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Unexpected slope change in I–V curve of an infrared LED — beginner question
I’m a complete beginner working on a simple experiment to measure the I–V characteristics of LEDs.
For most visible LEDs, my results look as expected: the current increases exponentially once the ...
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Can 2-wire measurement reach 4-wire precision?
I recently came across the TIDA-060029 documentation from Texas Instruments (auto-balancing impedance measurement), and I’m not fully sure whether the method used in that design is 2-wire or 4-wire.
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How can I measure power supply noise and ripple lower than 100µV?
I’m working on a low-noise power supply design and need to verify that its output noise and ripple are below 100µV RMS.
However, my oscilloscope has an input noise floor ~500µV RMS, which completely ...
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Measuring BJT Gummel Characteristics with Keysight B1500A: Do I Need Three SMUs?
I want to measure the Gummel Plot of a bipolar junction transistor (BJT) using a Keysight B1500A. My setup includes two medium-power SMUs (MP-SMU) and one GNDU. The connections are: emitter → GNDU, ...
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Measurement mismatch in star-delta conversion
Recently, I was interested in star-delta conversion formula and I wanted to test it on a 3-phase motor. First, I connected its second terminals together to have star configuration, and I measured each ...
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Using a 10k Thermistor Across a Wide Temperature Range to Produce Linear Voltage Change
I have a 1/8 NPT thermistor that will be installed into a oil filter sandwich plate to measure oil temperature. Here is a link to it -> https://www.ebay.com/itm/276877376822
It is a 10k type, but ...
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How can I reduce the turn-off spikes in a push-pull converter?
I’ve designed and built a 12V–360V DC-DC converter. The circuit has just been powered up and is under testing. The output is stable at 360V. I had to damp the RCD clamp with an additional RC snubber, ...
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Strange or normal ohmeter measurements of IRF630 N-channel mosfets
10 new (bought on ebay) IRF630 N-channel mosfets. For all except for one of the 10 mosfets measured the following on an old multimeter on ohms x1k scale which I think uses 9 V battery.
Momentarily ...
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