Fluke 80T-150UA Operation, Measuring Technique, General Maintenance, Access Information

F1.eps

Figure 1. Initial Case Temperature Above Ambient vs Meter

Reading Above Ambient

Operation

Use the following procedure to operate the 80T-150UA probe:

1.Connect the banana plugs on the 80T-150UA to the input terminals of a high impedance DMM. Observe polarity.

2.Select a dc voltage range that will provide at least 1 mV resolution (1 mV/degree) and a full scale readout that will encompass the

expected temperature. The 2 V range of a

3 1/2-digit DMM is adequate. Ignore readings of less than 1° when a more sensitive DMM is used.

3.Set the 80T-150UA power switch to °C or °F, and energize the DMM.

4.Firmly touch the probe tip to the surface to be measured, or expose it to a liquid or gas. The DMM will display the temperature in degrees. Vary the probe angle and pressure when measuring solid surface temperatures. The highest stabilized reading will be the most accurate. (See the following measuring technique.)

WCaution

The force exerted on the probe tip should not exceed 15 pounds.

Measuring Technique

Here are some suggestions for improving the accuracy of your temperature measurements:

1.When measuring higher than ambient temperatures, adjust the connection between the probe and the surface until you get the highest temperature reading.

2.When measuring lower than ambient temperatures, adjust the connection between the probe and the surface until you get the lowest temperature reading.

3.When measuring near ambient temperatures, make the reading when the multimeter readout is most stable.

General Maintenance

Access Information

The battery and the calibration pots are located on the interior of the temperature-to-voltage converter assembly. Access to these locations is accomplished by removing the screw from the bottom side of the assembly and removing the top of the plastic box.

Battery Condition Test

1.Set the power switch to the OFF position.

2.Connect the 80T-150UA to the DMM.

3.Set the DMM to the 200 or 400 mV dc range.

4.Read the battery test voltage on the DMM or test instrument. For DMMs with 10 MΩ input impedance, a minimum reading of 100 mV is acceptable. For test instruments with 1 MΩ input impedances, such as ScopeMeter®, a minimum reading of 75 mV is acceptable, With these minimum readings, approximately 100 hours of battery life remain.