Fluke 1560 Black Stack, Руководство пользователя

Страница: 160 / 187

Recommended operating temperature 1 18 to 28°C (64 to 82°F)
Absolute operating temperature range 5 to 35°C (40 to 95°F)
Weight 2.5 lbs.
1 The accuracy specifications apply within the recommended operating temperature range. Accuracy limits
are increased by a factor of the temperature coefficient outside this range.
2
Short-term accuracy includes nonlinearity and noise uncertainties. It does not include long-term drift or
calibration uncertainties.
3 Temperature accuracies do not include sensor uncertainties. Accuracies using external CJC do not in-
clude reference junction temperature uncertainty.
13.2.1 Calculating Accuracy
Please refer to Section 12.2.1 for a discussion on calculating temperature accu-
racies for thermocouple measurements.
13.3 Operation
Using the 2566 Thermocouple Scanner Module with the 1560 Black Stack is
very simple. The following sections explain the steps for setting up and using
the 2566 to measure with thermocouples. For instructions for installing the
2566 Thermocouple Scanner Module onto the 1560 see Section 4.1.
13.3.1 Connecting a Thermocouple
The 2566 Thermocouple Scanner Module accepts both standard and subminia-
ture size thermocouple connectors. The connection is made with the positive
terminal on the left and the negative terminal on the right. You must use a con-
nector that matches the thermocouple type for the internal CJC to be accurate.
For example, if you are using a type K thermocouple you must also use a type
K connector which is made from the same type of metal. After inserting the
thermocouple connector into the 2566, wait two minutes before measuring for
best results.
The input channels are numbered from left to right and front to back as ex-
plained in Section 4.5.1 and Figure 7.
13.3.2 Selecting the Thermocouple Type
To display temperature accurately the 1560 must be programmed with the cor-
rect thermocouple type for each input channel. This is done using the
EDIT
PROBE soft-key in the PROBE menu (see Section 5.2.1). For example, if you
are using a type K thermocouple on Input 3 select the EDIT PROBE function
in the PROBE menu, select input channel 3, and set the CONVERSION type
to TC-K. The 1560 converts voltage to temperature according to the standard
formulas given in
NIST Monograph 175 (see Section 5.2.1.10).
When calibrating thermocouples or the 2566 module itself, it is often useful to
display voltage instead of temperature. Voltage is displayed by setting the
CONVERSION type to V (see Section 5.2.1.9).
1560 Thermometer Readout
User’s Guide
156