Calibration procedure of Tachometer

 

A tachometer ensures accurate readings of rotational speed. Let’s walk through the procedure for calibrating a non-contact digital tachometer using a Fluke 754 Process Calibrator as a reference standard:

1. Preparation:
• Familiarize yourself with the tachometer’s user manual to understand specific requirements for calibration1.
• Clean the tachometer and ensure it’s not damaged2.
2. Identify Reference RPM:
• Some tachometers have a built-in reference RPM, while others require an external source.
• For this procedure, we’ll use the Fluke 754 Process Calibrator as our reference standard.
• Generate a simulated signal (frequency) using the Fluke 754, along with an LED as the source of our reference value3.
3. Adjust the Tachometer:
• There are no adjustable parts in most handheld digital tachometers, so we’ll verify accuracy only.
• Point the tachometer’s laser at a rotating shaft with reflective tape (non-contact measurement).
• Ensure a steady hand and maintain a distance of no more than 24 inches for accurate readings3.
4. Verify Calibration:
• Check the tachometer readings at idle and high RPM.
• Adjust the idle speed to avoid vibration and stalling during transmission shifts