HATS-LR Low Resistance Transfer Standard.
In order to perform calibrations with a high degree of accuracy, reference standards must be employed at
every range or decade of the measuring or calibration instrumentation.
Clearly, this can be difficult and costly since these standards must be highly stable and their precise values
must be known with a high degree of certainty and sufficient resolution.
To minimize the cost and difficulty, more practical means of performing such calibrations is to use transfer
standards.
If one has a single standard that is calibrated by a national laboratory, one can then compare the
transfer standards to the certified standard by ratio techniques.
HATS-LR Low Resistance Transfer Standard.
| Model | Description |
|---|---|
| HATS-LR-X | Low Resistance transfer standard. |
The HATS-LR Series of transfer standards consist of 12 matched resistors, of value R, which may be
connected in series or parallel combinations to produce any number of values such as R/10, R, and 10R,
all with the same known deviation, thereby allowing progressive transfers to higher and lower decades.
For example, the 10 kΩ transfer standard may be used to transfer calibrations across 1 kΩ, 10 kΩ and 100 kΩ.
Resistor Type: Wirewound, hermetically sealed, low inductance.
Step Size: 1Ω , 10Ω, 100Ω, 1 kΩ, 10 kΩ, or 100 kΩ.
Accuracy:
Initial: ±15 ppm for 1Ω , 10Ω steps;
±10 ppm for 100Ω through 100 kΩ steps.
Long Term: ±15 ppm for 1 year;
±30 ppm for 2 years;
±45 ppm for 5 years.
Transfer:
±(1 ppm + 0.1 µΩ) for 10:1 and 100:1 ratios for 1Ω , 100Ω , 1 kΩ, 10 kΩ, or
100 k steps;
±1 ppm for 10:1 and 100:1 ratios for 10 step.
(Transfer accuracies apply when HATS-LR-SB, HATS-LR-PC, or HATS-LR-SP fixtures are used)
Matching:
Accuracy:
within 10 ppm for 1Ω , 10Ω steps;
within 5 ppm for 100Ω through 100 kΩ steps.
Temperature Coefficient:
within 5 ppm/°C for 1 step;
within 3 ppm/°C for ≥ 100Ω steps.
within 5 ppm/°C for HATS-LR-10 only
Calibration Accuracy: ±
10 ppm for 1Ω and 10Ω steps;
±5 ppm for all others.