How to Choose a Multimeter for Calibration Work

# How to Choose a Multimeter for Calibration Work Choosing the right multimeter is critical for calibration laboratories. This article guides you through the key considerations. ## Key Selection Factors ### 1. Resolution - **4.5 digits** - General purpose, maintenance - **5.5 digits** - Production line testing - **6.5 digits** - Laboratory work, working standard - **7.5-8.5 digits** - Metrology, reference standard ### 2. Accuracy Must be at least 4x more accurate than the unit under test (TUR ≥ 4:1). ### 3. Measurement Functions Should support DC/AC Voltage, DC/AC Current, and Resistance at minimum. ### 4. Interface Support for GPIB, USB, LAN for automated calibration software. ## Recommended Multimeters - **Fluke 8588A** - 8.5-digit reference - **Keysight 34465A** - 6.5-digit working standard, great value - **Keysight 3458A** - All-time popular reference multimeter