All Questions
Tagged with impedance-matching oscilloscope
15
questions
1
vote
3
answers
111
views
How to match multiple impedance discontinuities?
I am trying to design a circuit to transmit various digital high frequency signals over cables, connectors and pcb to an oscilloscope. The simplified circuit looks like this:
simulate this circuit &...
- 49
0
votes
1
answer
48
views
Coax cables, impedance matching and BNC extensions
I'm trying to understand how to do proper measurements with a Voltage Differential Probe ( TT-SI 9010. This probe has an output impedance of 50ohm and has a BNC (It doesn't specify it in the data ...
- 324
1
vote
1
answer
52
views
Coax cables and input impedances
I'm doing a voltage measurement with the help of an Active Differential Probe (TESTEC TT-SI 9010) with an output voltage of +-7V. This voltages have rise times of the order 500ns.
The set up looks ...
- 324
1
vote
4
answers
546
views
How can I match a transmission line impedance on the source side?
Suppose that I want to transmit a signal by a coaxial cable to a high-impedance load.
The signal is a single-ended TTL (3.3V) single square impulse from an FPGA output. The package of the FPGA is LQFP-...
- 2,247
0
votes
1
answer
478
views
Oscilloscope impedance mismatch issue
We have connected an oscilloscope and a function generator using a connector plate. We have terminated the signal connections from the oscilloscope & the function generator to the connector plate ...
0
votes
1
answer
231
views
Could impedance mismatch explain my distorted signal?
I have a custom PCB which scales and offsets an analogue signal, using an instrumentation op-amp (INA114). When I use a scope to look at the output, it looks distorted (see images below). When I use a ...
- 3
7
votes
3
answers
2k
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Using a miniature BNC connector on a PCB to measure high-frequency content with an oscilloscope
I am a power electronics engineer in R&D and often measure fast switching waveforms, specifically high bandwidth MOSFET gate signals. When connecting oscilloscope probes in the past I have found ...
- 81
1
vote
0
answers
115
views
Why is an attenuator placed on the scope end and not the PCB end?
I've noticed when adding an external attenuator between PCB and the scope (1MOhm) that it is placed in this manner:
PCB -> SMA Socket -> SMA Cable Plug -> SMA Attenuator -> SMA-to-BNC -> Scope
Why ...
- 85
-1
votes
1
answer
685
views
LED output with Photodiode and Function Generator
Some of my student and I are designing a Physics experiment involving a high power LED, a square wave from function generator (50 ohm output impedance) and a digital oscilloscope (1 MOhm imput ...
- 101
0
votes
1
answer
1k
views
Circuit diagram of an oscilloscope with 50 ohm load impedance
I was told some oscilloscopes have 50 ohm impedance settings for radio frequency measurements for impedance matching (as opposed to one 1M ohm resistor and a 10pF capacitor in parallel for load ...
- 533
1
vote
2
answers
352
views
Impedance matching with unknown filter
My question is related to impedance matching when using a function generator and oscilloscope to identify a type of passive filter, i.e. low pass, high pass, etc.
If I output a function sweep from a ...
- 11
0
votes
4
answers
584
views
Impedance mismatch
When I connect an oscilloscope to a function generator use both oscilloscope cable (one connect to the scope and one connect to the FG), I got 700mVpp when outputing a sine wave of 1Vpp and 10kHz.
...
- 235
1
vote
3
answers
1k
views
Designing a test instrument to be connected to an oscilloscope
I'm working on a piece of test equipment that is intended to be hooked up to an oscilloscope to measure the waveforms it produces. Since that's its reason for being, I figured it made sense to provide ...
- 7,749
10
votes
2
answers
20k
views
Terminating a 50 Ohm source into 1M Ohm oscilloscope input
Due to buying some equipment several months apart I am now faced with the task of connecting a high speed ,up to 1GHz, light detector that requires a 50\$\Omega\$ load impedance, but my oscilloscope ...
- 251
3
votes
1
answer
2k
views
Matching oscilloscope impedance to detector
I have a detector with a preamp that has an output impedance of \$50\Omega\$. My oscilloscope has an input impedance of \$1\rm{M}\Omega\$ and capacitance of 16pF. The signals I'm interested in are on ...
- 171