# If There is a Temperature Coefficient Listed in the Specifications, When is the Coefficient to be Applied?

If there is a temperature coefficient listed in the specifications of the instrument's user manual, that coefficient is to be applied in the following conditions:
1. The unit is calibrated within the Standard Operating Conditions and the temperature of the unit changes in the range of the Standard Operating Conditions after calibration
2. The unit is calibrated within the Standard Operating Conditions and the temperature of the unit changes to outside the range of the Standard Operating Conditions after calibration
3. The unit is calibrated outside the Standard Operating Conditions and the temperature of the unit does not change after calibration
4. The unit is calibrated outside the Standard Operating Conditions and the temperature of the unit changes after calibration

Case1:

If the unit is calibrated in the Standard Operating Conditions and if the temperature of the unit does not change, the accuracies of the measurement are only fundamental accuracies. If the unit is calibrated in the Standard Operating Conditions but if the temperature of the unit is changed in the range of the Standard Operating Conditions after the calibration, the temperature coefficients (only Zero) will be applied to the fundamental accuracies.

For example:
If the 701250 is calibrated at 23°C and the temperature does not changed after the calibration, the measurement accuracy is 5 mV/div to 20 V/div: ±(0.5% of 10 div).
If the 701250  is calibrated at 23°C, and the temperature changes to 25°C (in the Standard Operating Conditions), the measurement accuracy is 5 mV/div to 20 V/div: ±(0.5% of 10 div)  and  Zero point: 5 mV/div to 20 V/div: ±(0.05% of 10 div)*(25°C-23°C).

Case2:

If the unit is calibrated within the Standard Operating Conditions and the temperature of the unit changes to outside the range of the Standard Operating Conditions after calibration, the temperature coefficients (Zero and Gain) is applied to the fundamental accuracies. The calibrated temperature value of the Zero coefficients and the calibrated temperature value of the Gain coefficients are not same.
Zero coefficients: the calibrated temperature value is the difference from the calibrated temperature.
Gain coefficients: the calibrated temperature value is the difference from the Standard Operating Conditions.

For example:
If the 701250 is calibrated at 23°C, and the temperature changes to 30°C (outside the Standard Operating Conditions range), the accuracies are 5 mV/div to 20 V/div: ±(0.5% of 10 div) and Zero point: 5 mV/div to 20 V/div: ±(0.05% of 10 div)*(30°C-23°C) and Gain: ±(0.02% of 10 div)*(30°C-28°C). The Standard Operating Conditions are from 18°C to 28°C. So the Gain coefficients are calculated from 28°C.

Case3:

If the unit is calibrated outside the Standard Operating Conditions and the temperature of the unit does not change after calibration, the temperature coefficients(only Gain) is applied to the fundamental accuracies.

For example:
The 701250 is calibrated at the 30°C, but the temperature does not change, the accuracies are 5 mV/div to 20 V/div: ±(0.5% of 10 div) and Gain: ±(0.02% of 10 div)*(30°C-28°C). The Standard Operating Conditions are from 18°C to 28°C. So the Gain coefficients are calculated from 28°C.

Case4:

If the unit is calibrated outside the Standard Operating Conditions and the temperature of the unit changes after calibration, then the temperature coefficients (Zero and Gain) is applied to the fundamental accuracies.

For example:
The 701250 is calibrated at the 30°C, but the temperature becomes to 32°C(out side of the Standard Operating Conditions), the accuracies are 5 mV/div to 20 V/div: ±(0.5% of 10 div)  and  Zero point: 5 mV/div to 20 V/div: ±(0.05% of 10 div)*(32°C-30°C) and Gain: ±(0.02% of 10 div)*(32°C-28°C). The Standard Operating Conditions are from 18°C to 28°C. So the Gain coefficients are calculated from 28°C, but the zero coefficients are calculated from the 30°C calibrated point.

The DL750, DL850, and 701280 modules do NOT list a Temperature coefficient in their specifications

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