Signal Generator Maintenance and Calibration Guide
Regular maintenance and calibration of signal generators ensure stable, accurate output signals for reliable test and measurement results.
I. Routine Maintenance
Daily
- Inspect output connectors for damage or contamination
- Clean the front panel and display with a soft, dry cloth
- Verify basic output functionality with an oscilloscope or frequency counter
- Check that ventilation openings are not obstructed
Monthly
- Verify output amplitude accuracy across multiple frequencies using a calibrated power meter or oscilloscope
- Check frequency accuracy against a calibrated frequency counter or GPSDO reference
- Test all waveform types for proper generation
- Inspect power cord and internal cooling fan operation
Annually
- Professional calibration by certified laboratory with traceable standards
- Verify harmonic distortion, spurious output, and phase noise specifications
- Check modulation accuracy (AM depth, FM deviation)
- Update calibration certificate
II. Common Problems and Solutions
No Output Signal: Verify output is enabled. Check for correct output connector selection. Test with a known good cable and load. Verify output settings (amplitude not set to zero).
Incorrect Amplitude: Verify load impedance matches output impedance setting. Check cable quality and connections. Use proper termination (50 ohm feed-through terminator for high-impedance loads).
Frequency Inaccuracy: Allow adequate warmup time. Check if external reference is properly connected (if using). Verify internal timebase calibration. Compare against calibrated frequency standard.
Distorted Waveform: Check for overloading condition. Verify cable integrity. Reduce output amplitude and check if distortion decreases. Check for ground loops in test setup.
Display or Control Issues: Power cycle the instrument. Check for firmware updates. If persistent, contact manufacturer for service.
