LESSON 3
DCLF REFERENCE STANDARDS
TASK
Describe the function and operation of each thermal reference
standard
and
theoretically troubleshoot the 1600A Thermal Reference Standard.
CONDITIONS
Given the information and illustrations about theory and applications relating to
DCLF reference standards.
STANDARDS
Demonstrate competency of the task skills and knowledge by correctly responding to
at least 80 percent of the multiple-choice test covering theory and applications of
thermal reference standards to include theoretical troubleshooting of the 1600A
Thermal Reference Standard.
REFERENCES
None
Learning Event 1:
DESCRIBE THE MODEL 1600A THERMAL REFERENCE STANDARD
1. In the preceding lesson, you learned how to make very precise measurements of
the DCLF voltages at the secondary transfer level by utilizing thermal transfer
standards.
The instruments discussed were very stable and accurate, making them
suitable for a variety of applications.
As you are aware, all calibration
standards in the field of electronics require periodic calibration themselves and
must be recertified in order to assure valid calibration of the items they support.
Naturally, the calibration requires that the instruments used in the process must
be more accurate than the item being calibrated. In other words, you wouldn't use
a Model 260 Multimeter to certify a Model 3490A Digital Voltmeter.
2. To satisfy this need, the Model 1600A Autobalance AC/DC Transfer Standard and
the Model NBS TVC Thermal Voltage Converter set are maintained at the calibration
laboratory, both of which have directly traceable certification to the National
Bureau of Standards.
Additionally, the Model 1600A is specified for use in the
calibration of the Model 332A/B DC Voltage Standard, Model 887AB Differential
Calibrator, and the Model 1394 Thermal Converters.
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