Dynamometer Precision Operation and Maintenance Guide: From Calibration to Intelligent Upgrade

1. Preparation before calibration

Environmental Control

The laboratory temperature must be stable in the range of 20±2℃, humidity ≤60%, and vibration interference must be avoided. The dynamometer should be preheated at rated voltage for 1 hour to eliminate sensor temperature drift.

Equipment inspection

Check the shielding of the torque sensor cable. It is recommended to use twisted-pair cables to prevent electromagnetic interference. The calibration arm length is determined by model. For example, the standard arm length is 1000mm±0.5mm. The factory calibration value must be recorded.

2. Step-by-step calibration process

Zero point calibration

Disconnect the load, start the dynamometer until the speed returns to zero, and execute "Auto Zero" through the PLC interface. The initial torque deviation should be ≤0.1% FS.

Linear calibration (80% range method)

Load the standard weight to 80% of the measuring range (e.g., add 800 Nm to a 1000 Nm model). The system automatically calculates the proportional coefficient after the actual value is input into the host computer. Load the weight three times in both directions, taking the average value for calibration.

Full range verification

The load is gradually increased to 20%, 50%, and 100% of the range, the nonlinear error must be ≤±0.3%. If the axial runout of the bearing exceeds 0.02 mm, it must be replaced. Use an oscilloscope to check the encoder signal delay.

3. Daily maintenance strategy

Periodic calibration

Calibrate every 300 hours under high load conditions; calibrate every 6 months or 2000 hours cumulatively under normal use.

Typical troubleshooting

If the display changes, check the 24V power supply ripple (≤50mV); if the response is delayed, replace the servo motor encoder battery (CR2032).

4. Technical upgrade suggestions

Install a wireless torque monitoring module to achieve real-time tracking; use an AI algorithm based on vibration spectrum analysis to predict bearing life and perform maintenance in advance.