ADALM2000 - Signal Generator - Unexpected Vpp/Vrms readings

ChrisC2 on Oct 22, 2020

Hello guys,

Appreciate your comment about why the below results are happening.

I've recently got the ADALM2000 and have been testing my lab assignments in Scopy v1.1.2. I am testing the following multisim setup at 1.76Vrms (5Vpp)

However, the Vrms I get in Scopy (~590mV) are not what I was expecting (~1.7Vrms)... Sine source of 5Vpp at 1kHz.

In several other experiments it's the same situation: the Vpp and Vrms results are Not what I was expecting in my calculations and multisim simulations.

This voltage discrepancy only happens with AC, not DC.

Thank you

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dmercer
Oct 22, 2020 +2 verified
The signal generators (AWG) in the M2k have 50 ohm source impedance. In your simulation you are using an ideal voltage source (I'm guessing with 0 ohms source impedance) driving 21 ohms as the load. Try…

+1 dmercer

on Oct 22, 2020 7:18 PM
The signal generators (AWG) in the M2k have 50 ohm source impedance. In your simulation you are using an ideal voltage source (I'm guessing with 0 ohms source impedance) driving 21 ohms as the load. Try your simulation with 50 ohms in series with V5.

Doug
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0 ChrisC2 on Oct 22, 2020 9:06 PM in reply to dmercer

Thank you very much Doug,

I'll will be considering the source impedance in the future.

This is the simulation reading results:
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