CTC Data Acquisition and Validation 3

Question 1

Which error source causes all channels in a multiplexed DAS to have a slight timing difference between their samples?

Accepted Answer

Skew error

Answer

Skew error arises because time-division multiplexing samples channels sequentially rather than simultaneously, introducing a time offset between channels.

Question 2

In telemetry data validation, a 'gap' in the data record most commonly indicates:

Accepted Answer

A loss of RF link or recorder dropout during acquisition

Answer

Data gaps typically result from a temporary RF link outage or recording medium dropout causing missing frames in the time history.

Question 3

The term 'bit error rate' (BER) in a telemetry system measures:

Accepted Answer

The ratio of incorrectly received bits to total transmitted bits

Answer

BER is the fraction of bits received in error compared to the total number of bits sent, indicating link quality.

Question 4

What is the function of a signal conditioner in a data acquisition chain?

Accepted Answer

Amplify, filter, and convert raw sensor output to a range suitable for the ADC

Answer

Signal conditioning adapts raw transducer outputs—through amplification, filtering, and excitation—to match the ADC's input requirements.

Question 5

A zero-order hold (ZOH) artifact in sampled data appears as:

Accepted Answer

A staircase-like distortion of the reconstructed waveform

Answer

ZOH reconstruction holds each sample value constant until the next sample, producing a staircase approximation of the original continuous signal.

(CTC) Certified Test Conductor Practice Test

(CTC) Certified Test Conductor Practice Test

CTC Data Acquisition and Validation 3