Electronics > Beginners
AWG vs. Bench Power Supply
ArcticPhoenix0:
Not sure if I understand this but an AWG, specifically the SAG1021 for use with the SDS1104X-E is a way of generating specific waveforms which then excites the DUT which I can then measure the individual components with my scope.
After learning that, I ask myself (and now all of you), do I need a bench supply if I have an AWG? Am I missing something here?
NDani:
Even though AWGs offer the option to output a DC voltage, this feature is not intended for powering circuits. This is because, as blueskull also points out, AWGs are not designed to source high currents such as several hundred milliamps.
Also, most AWGs, including the SAG1021, have a fixed 50 ohm output impedance to match it to systems with 50 ohm transmission lines (in order to avoid signal reflections at high frequencies). This output impedance will cause the voltage of the AWG drop if you try to load it with a high current.
So you most certainly need a bench supply as well.
tautech:
--- Quote from: ArcticPhoenix0 on February 05, 2020, 04:50:46 am ---Not sure if I understand this but an AWG, specifically the SAG1021 for use with the SDS1104X-E is a way of generating specific waveforms which then excites the DUT which I can then measure the individual components with my scope.
After learning that, I ask myself (and now all of you), do I need a bench supply if I have an AWG? Am I missing something here?
--- End quote ---
Check the X-E datasheet and the answer becomes obvious.
As it's USB powered only 3V max into 50 ohms is very limiting for a PSU but it could power some low voltage IC's all the same.
Also unlike a proper PSU you don't have any current limiting or CC mode.
MarkF:
--- Quote from: ArcticPhoenix0 on February 05, 2020, 04:50:46 am ---Not sure if I understand this but an AWG, specifically the SAG1021 for use with the SDS1104X-E is a way of generating specific waveforms which then excites the DUT which I can then measure the individual components with my scope.
After learning that, I ask myself (and now all of you), do I need a bench supply if I have an AWG? Am I missing something here?
--- End quote ---
Are you confusing the process of having the scope capture a waveform, transferring that waveform to the AWG, and then have the AWG reproducing that waveform for injecting into a circuit? IMHO, capturing a waveform by a scope to be able to duplicate it by an AWG is a niche capability.
You will still need a power supply to power the test circuit. An AWG is not able to do that.
A Function Generator creates signals. They are not intended to provide power.
GerryR:
Or, you could get something like this and have everything in one unit:
Tenma 72-7290 Universal Test System DMM Plus Power Supply/counter/generator, Digital Multimeter, Frequency Counter, Function Generator, Power Supply; Triple output power supply; True RMS 40,000 count digital multimeter.
Depending upon your level of expertise, this can cover a lot of ground. Of course you still need a 'scope!
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