A self-contained calibration kit used to calibrate theDigibridges. Plugs into the built-in test fixtures or remote fixtures. Consists of four resistors, a precision open and precision short. An 17025 Accredited calibration chart is provided with R & Q values for each resistor.

• Nominal Values: R1: 95.3 kO ; R2: 5.97 kO , R3 374 O , 24.9 O
• Accuracy: 0.1% of nominal value
• Stability: Better than 25 ppm per year
• Temperature Coefficient 2°C ppm

Calibration Accuracy: These resistors are compared with a precision of 5 ppm to working standards whose absolute values are known to 10 ppm, as determined from reference standards whose absolute values are know to 10 ppm,as determined from reference standards periodically measured by NIST. The 1 kHz Q values are in parts-per million and are based on the D values of GenRad 1404 capacitors which have been shown to be less than 5 ppm, and the assumption that the difference between the inductance of a low -valued composition resistor and a wire of the same geometry is negligible. These Q values should be within 25 ppm at 1 KHz. All calibrations are made at 23° ± 2 C°..

Additional traceability paths: NPL in the UK has calibrated these resistors and found the following differences well within the allowable 15 ppm specification