Basic Connection Troubleshooting is the top priority.
Verify that BNC cables are firmly attached to the signal generator output port and the reference calibrator input port, free from any looseness or sporadic connections, by checking the connection status of each test cable.
Make sure all test cables are continuous by using a multimeter to check for internal breakage and bad connections. Retest after replacing with brand-new spare test cords.
To prevent calibration failure due to channel misalignment, make sure that all wiring channel numbers match exactly, with no cross-connections or improper connections.
Troubleshooting the environment and power supply is the second priority.
Verify that the equipment has been preheated for at least half an hour and that the temperature of the calibration environment is steady at 23±5°C. Accuracy variations and calibration failure are quite likely to occur from improper preheating.
Verify that the signal generator and reference calibrator's power supply circuits are free of severe interference, that the equipment is consistently grounded, and that the grounding resistance is less than 4Ω. Cut out any interference from grounding loops.
To prevent electromagnetic interference that could lead to signal drift and calibration failure, make sure the calibration environment is free from sources of severe vibration and magnetic fields.
Troubleshooting Reference Equipment is the third priority.
Verify that the reference calibrator satisfies accuracy standards and is within its calibration validity period. Calibration failure is directly caused by inaccurate reference equipment.
Verify that the reference calibrator has finished warming up, that the range settings are accurate, and that there are no operational issues.
Signal Generator Troubleshooting is the fourth priority.
Check for hidden defects in the core analogue circuit and make sure there are no hardware errors by entering the signal generator system self-test menu.
Examine the output ports for oxidation-related poor contact or physical damage. Retest after cleaning the oxide coating on the ports.
Verify that the firmware on the device is up to date. Unusual calibration failures could result from known flaws in previous firmware versions.
Operation Procedure Troubleshooting is the fifth priority.
Recheck the calibration operation method to make sure there are no operational faults and that the operation completely complies with the settings and steps specified in the performance verification manual.
To prevent misjudging calibration failure owing to calculation mistakes, recalculate the calibration error and validate that the error calculation methodology is correct.
More than 95% of calibration failure spots can be promptly identified by using the above method of step-by-step troubleshooting, and the calibration work can be finished without going back to the factory for repairs.
