Digital to Analog Conversion

Question 1

What 2 ways is the resolution of ADC or DAC stated?

Answer 1

1) Voltage difference between 1 and 0
2) Number of input or output bits that the converter uses

Question 2

What is a quantization error?

Answer 2

When ADC is off by a certain amount due to it’s resolution and whether it’s truncating or rounding

Question 3

When calibrating the ADC of an AI card what 2 factors are determined?

Answer 3

1) Zero offset
2) Gain

Question 4

What is aliasing?

Answer 4

A sampling effect that changes the input frequency to another frequency due to the conversion process/scan time of the converter

Question 5

How can you prevent the aliasing effect?

Answer 5

A low pass filter (anti-aliasing filter) filters out high frequency inputs

Question 6

What is bandwidth relating to ADC?

Answer 6

Bandwidth indicates the highest frequency that the AI card can read.

Question 7

What is scan time?

Answer 7

The time interval between scanning for a signal

Question 8

What is output settling time?

Answer 8

Time from an input change to a signal settling out within tolerance range