Avery Berkel L126 Calibration May 2026

Avery Berkel L126 Calibration Guide: A Step-by-Step Walkthrough

The Avery Berkel L126 is a staple in the weighing industry, known for its reliability in industrial and retail environments. However, like any precision instrument, it requires periodic calibration to maintain accuracy and compliance with weights and measures regulations.

Whether you are troubleshooting "drift" or performing routine maintenance, this guide covers the essential steps for calibrating your Avery Berkel L126 indicator. Prerequisites Before You Begin

Calibration isn't just about pressing buttons; it’s about environment and equipment. Ensure you have the following:

Certified Test Weights: You will need weights roughly equal to the scale’s maximum capacity (e.g., if it’s a 15kg scale, have 15kg of certified weights ready).

Stable Surface: Ensure the scale is on a level, vibration-free surface.

Warm-up Time: Power on the unit for at least 15–30 minutes to allow the internal electronics to stabilize. Step 1: Entering Calibration Mode

To prevent accidental changes, the L126 usually requires a specific key sequence or a physical "cal-switch" adjustment. avery berkel l126 calibration

Locate the calibration security switch (usually found behind a lead seal or a small panel on the underside/back of the indicator). Move the switch to the ON or CAL position.

Turn the scale on. The display should enter a setup menu (often indicated by a message like SETUP or F1). Step 2: Setting Capacity and Increments

Before the actual weight test, ensure the scale parameters are correct: Capacity: Set the maximum weight the scale should measure.

Division (d): Set the scale’s readability (e.g., 0.005kg or 0.01lb). Units: Choose between Kilograms (kg) or Pounds (lb).

Navigate through these settings using the TARE (to cycle) and ZERO (to confirm) keys. Step 3: Zero Calibration (Deadweight)

The scale needs to know what "zero" looks like with nothing on the platform. Ensure the scale platform is empty and clean. Select the Zero Calibration option from the menu.

Press ZERO to confirm. The display will usually countdown or flash while it captures the deadweight of the platter. Step 4: Span Calibration (Loading Weights) This step teaches the scale how to measure actual weight. Calibration Test Weights: You need Class F or M1 weights

When the screen prompts (often showing LOAD or a flashing weight value), place your certified test weights on the center of the platform.

Use the keypad to enter the exact value of the weights you have placed on the scale. Press ZERO or ENTER. The scale will process the "Span."

Once finished, the display should show a PASS or END message. Step 5: Exiting and Sealing Remove the weights from the platform.

Return the physical calibration switch to the OFF or LOCK position. The scale will reboot into normal weighing mode.

Test the accuracy: Place a known weight back on the scale to ensure the reading matches perfectly. Troubleshooting Common Issues

Error "Err 4": This often indicates that the calibration weight used was too small. Try using a weight closer to the scale's full capacity.

Unstable Readings: Check for drafts, vibrations, or the scale touching a nearby wall or object. Inspect scale for physical damage

Inconsistent Spans: If the scale won't hold calibration, the load cell may be damaged or "binding" (hitting a mechanical stop). Important Regulatory Note

If you are using the Avery Berkel L126 for "Legal for Trade" applications (selling products by weight), calibration must be verified and sealed by a licensed weights and measures official or a certified service technician.

Part 3: The Step-by-Step Calibration Procedure

This procedure covers a "Hard Calibration" (Span Calibration) for the Avery Berkel L126. It assumes you have physical access to the internal PCB.

Required Equipment

  1. Calibration Test Weights: You need Class F or M1 weights. For a full span, you typically need 50% and 100% of the scale’s capacity. Example: For a 15kg L126, you need a 5kg and a 15kg weight.
  2. Small Flathead Screwdriver: To toggle calibration switches on the mainboard.
  3. Avery Berkel L126 Service Manual (or this guide): The public user manual does not contain calibration codes.

Step 2: Access the Calibration Menu

  1. On the keypad, press and hold the [TARE] key.
  2. While holding Tare, press and release the [UNITS] key.
  3. Release the [TARE] key.
  4. The display should show "CAL" or "SERVICE" . If it shows "LOCAL" or remains in weighing mode, you did not flip the internal switch correctly.

Pre-Calibration Checks

  1. Inspect scale for physical damage, loose parts, or dirt on the pan and load cell.
  2. Ensure scale is placed on a stable, vibration-free surface and is level.
  3. Verify power stability—use mains within rated voltage or UPS if needed.
  4. Warm-up the scale per manufacturer recommendation (typically 15–30 minutes).
  5. Remove any tare or stored weights; clear settings to standard weighing mode.

Frequently Asked Questions (FAQ)

Q: Can I use a dumbbell or a bag of rice for calibration? A: No. Household weights are never accurate enough. The L126 is precise to 2g or 5g. You need certified Class M1 or F2 test weights.

Q: My L126 shows "0" when empty, but -50g when I turn it on the next day. A: This is temperature drift. If a warm-up zero doesn't fix it, you need to perform the "Zero Calibration" step again in the ambient operating temperature.

Q: What is the difference between Calibration and Configuration? A: Calibration sets the physical weight-to-electronics ratio. Configuration sets the scale’s ID, baud rate, and price lookups. Do not confuse the calibration menu with the "FUNC" configuration menu.

Q: I lost the calibration manual. Can I find the factory default values? A: The L126 does not have "default values" because every load cell is different. You must perform the calibration procedure with physical weights. There is no shortcut code.