How to verify the accuracy of RC parameters after locking?

I. Hardware baseline parameters accuracy check

Capacitance Deviation Verification: Directly test the actual resistance and capacitance values of the locked RC network with a digital multimeter of at least 6.5 digits precision, verifying a deviation of ≤5% of the calibration baseline value.

Verification of filter cut-off frequency: Standard sine wave of different frequencies is input into the temperature controller input by utilising a standard signal generator, with a variance of ≤10% between the actual filter cut-off frequency and the set value.

Interference attenuation accuracy verification: tested signal attenuation after filtering shall be ≥20dB for the primary frequency interference signal tested in the workshop, which may completely meet the target interference suppression criteria.

II. Accuracy verification of dynamic signal transmission

Temperature Measurement Delay Accuracy Test: Change standard temperature at thermocouple terminals rapidly and record delay time for temperature signal to reach temperature controller to validate ≤200ms with no sampling lag deviation.

Signal Ripple Accuracy Test: A dual-channel oscilloscope with a 100MHz bandwidth was used to observe the filtered temperature signal to ensure that the peak-to-peak ripple value was ≤10mV and there was no anomalous noise interference impacting sampling accuracy.

Temperature reading accuracy comparison: the actual temperature of each point in the hot runner was simultaneously collected by a CNAS-calibrated 0.1-grade high-precision temperature monitoring equipment, and the deviation of the temperature controller reading was compared to ≤±0.5℃.

III. Accuracy Verification of Actual Production Condition

Hot Runner Heating Control Accuracy Verification: Hot runner heating was begun and it was verified that there was no major overshoot in the heating process (overshoot range ≤3℃) and no temperature oscillation.

Verification of full-load interference accuracy: All high-power injection moulding machines and frequency converters around the workplace were turned on to simulate the utmost on-site interference conditions, and it was confirmed that the temperature readings did not jump or drift.

Process Adaptability Accuracy Verification: Check the product yield is stable after 8 hours continuous manufacturing, no defects such as insufficient glue, flash or stress marks produced by the temperature sampling accuracy deviation.

IV. Long-Term Lockout Accuracy Test

Lockout Accuracy Confirmation: After 72 hours of continuous operation, verify that the temperature controller status bar still displays the "RC Hardware Lock" signal and that there are no log entries indicating automated parameter reset or adjustment.

Data archiving and traceability: All verification data are recorded in the process file as a standard for subsequent dynamic changes of RC parameter calibration cycles, and traceability of accuracy is ensured.