【Technical Solution】Electronic Balance Shows "CALF" During Calibration? Full Analysis of 2 Core Causes & Solutions

1. What Does "CALF" Mean?

2. Core Cause 1: Unqualified Calibration Environment (Most Common)

Common Issues

1. Inadequate Preheating: High-precision balances (e.g., accuracy ≥ 0.1mg) require 30 minutes to 2 hours of preheating after being powered on (refer to the equipment manual for specific requirements). If calibration is performed directly without preheating, the sensor will not enter a stable working state, leading to data distortion.
2. Unstable Table or Vibrations: The balance is placed on a wobbly table or near vibration sources such as printers, fans, or air conditioning vents. During calibration, the weight position shifts, and the sensor is continuously disturbed.
3. Unaligned Table: The level bubble at the bottom of the balance is offset, causing uneven force on the weighing pan and deviations in weight data collection.

Solutions

1. Strictly Follow the Preheating Process: After powering on, let the balance stand for at least 30 minutes without touching any buttons during this period to ensure the sensor temperature and environment are stable.
2. Optimize the Calibration Environment: Move the balance to a stable, vibration-free solid table. Turn off air conditioners and fans, and keep it away from doors and windows (to avoid air flow interference) to maintain a stable ambient temperature.
3. Ensure the Table is Level: Check the level bubble at the bottom of the balance. If the bubble is offset, slowly adjust the leveling feet until the bubble is centered. Ensure the balance is placed stably before starting calibration.

3. Core Cause 2: Incorrect Calibration Operation Steps

Common Issues

1. Failure to Enter the Correct Calibration Mode: Calibration is not started according to the manual (e.g., pressing the "Model" key once instead of holding it down), so the balance does not enter calibration mode before weights are placed.
2. Improper Weight Use:
   • Placing weights too early/late: Weights are placed before the screen displays "Wait for weight placement" (e.g., "CAL 100g") after calibration starts, or weights are removed before the balance automatically recognizes them.
   • Using mismatched weights: Weights with inconsistent weight (e.g., using 50g weights when 100g is required) are used.
3. Interference During Calibration: Touching the balance or table after placing weights, or foreign objects (such as dust, thread) sticking to the weighing pan/weights, affecting the accuracy of weight data.

Solutions

1. Standardize Operations According to the Manual (Reference General Process):
   
   
   ① After preheating, press the "ON/OFF" key to turn on the balance and ensure it shows "0.000g" (zero state).
   
   
   ② Hold down the "Model" key for 3-5 seconds until the screen displays "FO" or a specific weight value (e.g., "100g").
   
   
   ③ When the screen flashes the weight value (prompting to place the weight), gently place the calibration weight of corresponding accuracy in the center of the weighing pan.
   
   
   ④ After the screen displays "PASS" (calibration successful), remove the weight to complete calibration.
2. Keep Calibration "Interference-Free": After placing the weight, keep hands away from the balance. Wipe the weighing pan and weight with a clean soft cloth to ensure no foreign objects remain.

4. Summary of Quick Troubleshooting Process

1. Check the Environment First: Is the preheating time sufficient? Is the level bubble centered? Are there vibrations/air flow nearby? Is the table flat and stable?
2. Then Verify the Operation: Did you enter the calibration mode according to the manual? Is the weight matching and placed at the correct time? Is the process complete without interruption?