Accredited Multimeter Calibration Services
Precision in electrical testing is the cornerstone of system reliability and personnel safety. At DRS Technologies, we provide expert multimeter calibration services designed to eliminate measurement drift and ensure your instruments perform within their specific laboratory tolerances. Our technicians calibrate both analog and digital multimeters (DMM), verifying voltage, current, and resistance functions against high-precision reference standards.
Why Periodic Multimeter Calibration is Critical for Compliance
Over time, the internal components of a multimeter—such as voltage dividers and shunt resistors—can drift due to environmental heat, battery fluctuations, or mechanical wear. In sectors like aerospace, medical device manufacturing, and power distribution, an uncalibrated meter can lead to misdiagnosed faults, failed quality audits, and safety hazards. Regular calibration by DRS Technologies ensures your equipment remains compliant with ISO 9001 and ISO/IEC 17025 standards.
Our Comprehensive Multimeter Calibration Process
The specialists at DRS Technologies follow a systematic, multi-point protocol to verify every function of your device:
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Visual and Functional Inspection: We check for physical damage, terminal corrosion, and display clarity, ensuring the rotary switch and buttons operate smoothly.
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DC and AC Voltage Verification: Using stable voltage sources, we test the meter across its full range (from millivolts to 1000V) to verify linearity and frequency response.
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Resistance and Continuity Testing: We use precision decade boxes to verify accuracy across low and high ohmic values, ensuring 4-wire (Kelvin) precision where applicable.
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Current Accuracy Validation: Both AC and DC current ranges are tested using known reference loads to ensure the meter’s internal shunts are performing correctly.
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Certification and NIST Traceability: Every service includes a comprehensive calibration certificate featuring “As-Found” and “As-Left” data, uncertainty budgets, and an unbroken chain of NIST traceability.
Technical Expertise for Leading DMM Brands and Models
We specialize in the calibration of a wide array of electrical measuring tools, including:
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Handheld Digital Multimeters (DMM)
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Benchtop High-Precision Multimeters (5.5 to 8.5 digit)
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True RMS and Auto-ranging Multimeters
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Analog Multimeters and VOMs
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Clamp Meters and Power Quality Analyzers
DRS Technologies supports equipment from all major manufacturers, providing the technical documentation and rapid turnaround times required to keep your operations running safely and efficiently.
Frequently Asked Questions Regarding Multimeter Calibration
How often should a digital multimeter be calibrated?
The industry-standard calibration interval for a digital multimeter is twelve months. However, if the meter is used daily in harsh industrial environments or for critical safety-of-life testing, a six-month interval is recommended to account for accelerated component drift.
What is the significance of the 4:1 Test Uncertainty Ratio (TUR)?
The 4:1 TUR means that the reference standard used by DRS Technologies is at least four times more accurate than the multimeter being tested. This industry-standard ratio ensures high confidence in the calibration results and minimizes the risk of accepting a device that is actually out of tolerance.
Does a battery change affect my multimeter’s calibration?
While a simple battery change usually does not reset the calibration constants stored in the meter’s non-volatile memory, low battery voltage can cause electronic noise and inconsistent readings. We recommend a calibration check after any significant electrical maintenance or if the device has been exposed to an electrical overstack.