Concept:
A signal generator produces electrical waveforms.
Step 1: Purpose
Used in testing and analysis of circuits.
Step 2: Types of signals
Can generate sine, square, triangular waves.
Step 3: Not measurement device
Does not measure physical quantities.
Step 4: Application
Used for calibration and debugging.
Step 5: Conclusion
\[
\boxed{\text{Generate electrical signals}}
\]
Final Answer:
\[
\boxed{(B)}
\]