Author Archives: Khanh Nguyen
USP <41> Minimum Weight: How to Calculate It on an Analytical Balance
USP minimum weight is calculated, not specified: 2s divided by 0.001 from a 10-weighing repeatability...
Does a GPS-Disciplined Oscillator Need Calibration? GPS Lock vs ISO/IEC 17025 Traceability
GPS lock makes a GPSDO accurate, but not traceable. What ISO/IEC 17025 assessors require: the...
Dry-Block vs Liquid Bath: Which Temperature Calibrator Meets Your Uncertainty Target?
Axial inhomogeneity inside the block — not the display — dominates dry-block uncertainty. A worked...
pH Meter Calibration: What Slope and Offset Values Actually Pass
A pH meter calibration passes when the electrode slope falls within roughly 95-102% of the...
ISO 21501-4 Particle Counter Calibration: What Cleanroom Certification Requires
ISO 21501-4 sets the maximum permissible errors for particle counter calibration: 10% size setting, 50%±20%...
Accelerometer Calibration by Back-to-Back Comparison: ISO 16063-21 Explained
How accredited labs calibrate accelerometers by back-to-back comparison per ISO 16063-21: sensitivity, frequency response, typical...
EMC Antenna Calibration: Antenna Factor, ANSI C63.5 Methods and Intervals
EMC antenna calibration determines the antenna factor that converts EMI receiver voltage into field strength....
Thermocouple vs RTD: Accuracy, Drift, and Calibration Compared
RTD or thermocouple? Compare IEC 60751 and IEC 60584 accuracy classes, drift behavior, and how...
Noise Dosimeter Calibration: What OSHA 1910.95 Actually Requires
OSHA 29 CFR 1910.95 requires noise dosimeters to be calibrated for accurate exposure monitoring. Learn...
Deadweight Tester vs. Digital Pressure Calibrator: Which Does Your Lab Need?
Deadweight tester or digital pressure calibrator? How each works, the gravity/buoyancy/temperature corrections, typical accuracy, pressure...