I. Hardware Baseline Parameter Accuracy Verification
Capacitance Deviation Verification: Using a digital multimeter with at least 6.5 digits accuracy, directly measure the actual resistance and capacitance values of the locked RC network, confirming a deviation of ≤5% from the calibration baseline value.
Filter Cutoff Frequency Verification: Input standard sine waves of different frequencies to the temperature controller input using a standard signal generator, measuring a deviation of ≤10% between the actual filter cutoff frequency and the set value.
Interference Attenuation Accuracy Verification: For the main frequency interference signal measured in the workshop, the measured signal attenuation after filtering should be ≥20dB, fully covering the target interference suppression requirements.
II. Dynamic Signal Transmission Accuracy Verification
Temperature Measurement Delay Accuracy Test: Rapidly change the standard temperature at the thermocouple terminals and record the delay time for the temperature signal to reach the temperature controller, confirming ≤200ms with no sampling lag deviation.
Signal Ripple Accuracy Test: Using a dual-channel oscilloscope with a 100MHz bandwidth, the filtered temperature signal was observed to confirm that the peak-to-peak ripple value was ≤10mV and that there was no abnormal noise interference affecting sampling accuracy.
Temperature Reading Accuracy Comparison: Using a CNAS-calibrated 0.1-grade high-precision temperature monitoring instrument, the actual temperature at each point in the hot runner was simultaneously collected, and the temperature controller reading deviation was compared to ≤±0.5℃.
III. Actual Production Condition Accuracy Verification
Heating Control Accuracy Verification: The hot runner heating process was started, and it was confirmed that there was no significant overshoot during the heating process, with an overshoot range ≤3℃ and no temperature oscillation.
Full Load Interference Accuracy Verification: All high-power injection molding machines and frequency converters around the workshop were turned on to simulate the maximum interference conditions on site, and it was confirmed that the temperature readings showed no jumps or drifts.
Process Adaptability Accuracy Verification: After 8 hours of continuous production, it was confirmed that the product yield was stable and that there were no defects such as insufficient glue, flash, or stress marks caused by temperature sampling accuracy deviations.
IV. Long-Term Lockout Accuracy Verification
Lockout Accuracy Confirmation: After 72 hours of continuous operation, confirm that the temperature controller status bar still displays the "RC Hardware Lock" indicator, and there are no log records of automatic parameter reset or adjustment.
Data Archiving and Traceability: Record all verification data into the process file as the benchmark for subsequent dynamic adjustments to RC parameter calibration cycles, ensuring traceability of accuracy.
