All Questions
Tagged with measurement impedance
31
questions
1
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96
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Measuring impedance on VNA
Question:
I would like to measure the impedance and phase of an electric piezo tranducer with a resonant frequency of approximately 1MHz - a graph of impedance in Ohms as a function of frequency.
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- 292
0
votes
1
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152
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Source impedance influence on DC/DC converter input impedance measurement
simulate this circuit – Schematic created using CircuitLab
I have been tasked to verify the input impedance of a medium powered DC/DC converter (<1kW), and no experienced colleagues to ...
- 138
2
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3
answers
179
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Measuring variable impedance
I was wondering how to design a measurement system that's able to correctly measure a load impedance that can vary over time and can possibly have very low as well as very high values (see figure ...
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0
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101
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How do I measure impedance at high power?
I need to measure the impedance of a passive device at its operating power, about 100-watts, and its operating frequency, from 0.1-MHz to 10-MHz. The venerable "operating impedance bridge" ...
- 290
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85
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How do you "calibrate" (?) a matching network to re-optimize an S11 match based on physical measurements from a VNA?
We made EDA simulations to match an LNA input and had good results on the simulation (including EM simulation!) --- but when we built the board in real life the S11 match went from -30dB to -7dB. Ouch....
- 2,180
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1
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138
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How to measure output impedance of this circuit?
I have the following circuit with an operational frequency range of 100 - 10kHz, always square waves.
How do I measure the output impedance? I have access to an LCR meter (BK Precision 891.) Do I ...
- 135
1
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4
answers
172
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Experimental material impedance measurement
Imagine we have a square-shaped conductive material to which we connect 3 electrodes E1, E2, and E3. Suppose we assume for this material a 'pi' two-port network model with impedances Za, Zb, and Zc (...
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2
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192
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Two-port network parameter measurement using an LCR meter
I was wondering if it's possible to find the admittance parameters of a pi two-port network experimentally using an LCR meter.
For the network shown below, we have
$$
\begin{bmatrix}
I1\\
I2
\end{...
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-1
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6
answers
831
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Why is it not possible to measure PCB trace characteristic impedance using a multimeter?
I was looking into StackExchange posts for PCB trace impedance measurement.
How to measure trace impedance?
This posts clearly explains what the methods to be used for trace impedance measurement are.
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- 2,593
3
votes
3
answers
429
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How should I probe when measuring output impedance? Why do I get inconsistent readings?
I am trying to measure the output impedance of a commercial headphone amplifier, but the results seem to change depending on how I probe it. When I plug a 1m cable into the device and the other end ...
- 209
0
votes
1
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106
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Vector Network Analyzers: Bode100 vs Keysight P5000A
I have been using Bode 100 machine earlier to measure Impedance and Phase of my piezoelectric transducer.
The frequency range i work in is from 10kHz to 2.5MHz.
I was just comparing this Bode100 with ...
- 59
1
vote
3
answers
609
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What is the best way to measure current and voltage through a diode
I am reading the book Learning the art of electronics and on a part about diodes, the author pointed out that in characterizing a diode(I, V relation ) there is an unavoidable error due to the ammeter ...
- 103
0
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1
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85
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Will multiplexing impedance measurements from the AD5933 act as a series resisitance?
Image of block diagram of the AD5933 at: https://www.researchgate.net/profile/Douglas_Dutra/publication/292976112/figure/fig1/AS:520210098917376@1501039160818/AD5933-Functional-Block-Diagram-10.png
I ...
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1
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2
answers
1k
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RLC equivalent model and Impedance Smith Chart
I have done some impedance measurements on an unknown 1 port device. I have measured its impedance at different frequencies (from 10 MHz to 600 MHz) and I have seen it on the normalized (on 50 Ohm) ...
- 3,550
1
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2
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1k
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Agilent 4294A Impedance Analyzer: "Bridge Unbalanced" during calibration
I am having problems calibrating my test fixture for the Agilent 4294A Impedance Analyzer. The open measurement always works, but with the short measurement I always get the error message "Bridge ...
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