Fluke 80TK Calibration Procedure, Required Equipment, Location of Calibration Adjustments

80TK Calibration Procedure

A calibration cycle of 1 year is recommended to maintain the 80TK within specifications. The required equipment is listed below. Use Calibration Procedure 1 to calibrate the 80TK for use with any K-type thermocouple. Use Calibration Procedure 2 if the 80TK will be used exclusively with one K-type thermocouple. Always calibrate the Celsius function before calibrating the Fahrenheit function.

Location of Calibration Adjustments

Calibration Procedure 1.

Use this procedure to calibrate the 80TK:

1.Verify the condition of the battery as described above and replace the battery if necessary. Follow the Battery Replacement procedure to disassemble the 80TK, but do not remove the battery or reassemble the 80TK.

2.Allow 80TK and the room-temperature water bath to stabilize at room temperature, away from drafts, for at least 30 minutes before proceeding with calibration. Place the reference thermometer into the room temperature water bath. Allow the reading to stabilize.

3.Use the shorting bar to short the 80TK thermocouple input terminals.

4.Plug the 80TK into the dc volts input of the multimeter. Set the multimeter to the 300 mV or equivalent range.

5.Set the switch on the 80TK to CELSIUS position. Adjust R4 to half rotation, then adjust R5 until the reading on the

multimeter matches the reading on the mercury reference thermometer ± 5.0°C. Now adjust R4 until the two readings are within ± 0.1°C.

Note

If the mercury reference thermometer displays °F, use the following conversion to get °C:

[5/9 (temp in °F)-32] = (temp in °C)

6.Set the switch on the 80TK to the FAHRENHEIT (center) position.

7.Adjust R16 until the reading on the multimeter matches the reading on the mercury reference thermometer ± 0.2°F.

Note

If the mercury reference thermometer displays °C, use the following conversion to get °F:[9/5(temp in °C) + 32] = (temp in °F)

8.Set 80TK switch to the OFF position. Remove 80TK from multimeter and remove any connections to the 80TK thermocouple input terminals.

9.Reassemble the 80TK.

10.The 80TK is now calibrated.

Calibration Procedure 2.

Use this procedure if the 80TK will be used exclusively with one K-type thermocouple:

Perform Calibration Procedure 1. Substitute the following for step 3 in Calibration Procedure 1:

3.Connect the thermocouple to the 80TK thermocouple input, and place the thermocouple into the room temperature bath along with the mercury reference thermometer.

Required Equipment

Refer to Table 1 for equipment required to calibrate the 80TK.

Instrument

Mercury Reference Thermometer

Dewar Flask and Cap(water bath)

Digital Voltmeter

Shorting bar

OR

K-type thermocouple

Table 1. Required Equipment

Minimum Specification

0.1°C resolution

2 pint capacity, filled with water

300 mV range, 100 μV resolution

<1 ohm

meets NBS standards(with subminiature K plug)

Recommended Model

Princo Model SAMA-CP45 Thermos bottle

Fluke Model 87 Series III

Wire

Fluke 80PK-1

To contact Fluke, call one of the following telephone numbers:

USA: 1-888-99-FLUKE (1-888-993-5853)		Japan: +81-3-3434-0181
Canada:	1-800-36-FLUKE (1-800-363-5853)	Singapore: +65-738-5655
Europe:	+31 402-675-200	Anywhere in the world: +1-425-446-5500
Or, visit Fluke’s Web site at www.fluke.com.
	Fluke Corporation	Fluke Europe B.V.
	P.O. Box 9090	P.O. Box 1186
	Everett WA 98206-9090	5602 B.D. Eindhoven
	USA	The Netherlands