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THDB-ADA_HSMC, DAC voltage

Altera_Forum
Honored Contributor II
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I`m using the THDB-ADA_HSMC-Card with a DE2-115 Board. 

 

I`m able to measure an output voltage of the DAC of -1V and 1V while 

toggling the values of the ADC from 0 to (2^14)-1, and using the 1MOhm impedance-input of the oszilloscope. 

 

When I use the 50Ohm impedance-input, I´m able to measure -300mV and 300mV. But - the shown rectangle-signal on the oszilloscope looks a lot 

better, than using the 1MOhm input. 

 

Which output impedance does the Daughter-Card have and which voltages should I be able to measure ?
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