Calibration - Fluke 5626 User Manual

5626/5628
User's Guide
calibrated using a primary standard that has been calibrated in a primary
calibration laboratory using known intrinsic values.

2.3 Calibration

In order for any instrument to be used as a standard it must be calibrated. The
PRTs are calibrated in Hart's Scientific Calibration laboratory and provided with a
NIST traceable "Report of Calibration".
At the time of purchase, the 5626 and 5628 are calibrated over their entire range
( −196 °C to 660 °C) at specified ITS-90 fixed points. Generally, a secondary
PRT is calibrated by comparison method. All PRTs calibrated by Hart Scientific
are calibrated using standard calibration techniques.
2.4 Recalibration
The recalibration of the 5626/5628 Secondary PRT should be scheduled
according to the user's company Quality Assurance requirements. Normally, a
PRT is recalibrated annually. Unless the PRT is used only over a limited range,
calibration over the full range of the PRT ( −196 °C to 661 °C) is recommended.
For information on recalibrating your 5626 or 5628, contact Fluke's Customer
Service department for an RMA number and current pricing (see Section, Before
You Start).
Depending on the user's Quality Assurance requirements, the PRT drift should
be checked periodically at the Triple Point of Water (TPW). Section 8,
Troubleshooting, provides information on drift with respect to mechanical shock
and oxidation. If the R
tolerances, a full recalibration should be scheduled
2-2
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Figure 1. The 5626 and 5628 Platinum Resistance Thermometers
cannot be restored after annealing to within calibration
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