Introduction - Fluke 6055 User Manual

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Introduction

The 6055 Calibration Bath is a highly stable constant temperature salt bath. It
has been designed for calibrating liquid-in-glass thermometers or other types of
long thermometers against a known temperature standard such as a Standard
Platinum Resistance Thermometer (SPRT).
The 6055 calibration bath provides the following features:
A deep fluid tank (test well is 3.88 inches in diameter and has 17 inches
of fluid depth).
A highly temperature stable low gradient environment typically a nominal
stability of ±0.005°C with salt. The fluid is well stirred and environmen-
tally protected to minimize gradients.
The fluid level is near the top of the test well to facilitate calibration of
liquid-in-glass thermometers without needing to compensate for stem ef-
fect.
The bath provides two calibration modes; temperature control mode and
temperature drift mode. The temperature control mode uses a hybrid digi-
tal and analog PI controller with lock in amplifier design. The temperature
and other functions are selected with the four button keypad to a hun-
dredth of a degree and finer with a digital vernier adjustment. The Drift
mode bypasses the controller with heater power manually controlled by
the variable transformer.
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