Fluke 2180A - Manual (Page 13)

2180A
Section 1
Introduction & Specifications
: Si^TRODUCTION
1-2. The Model 2180A Digital Thermometer is a
portable, five digit RTD thermometer. Temperature
measurements are possible, depending on RTD type
employed, over a range of-219° C to +664° C (-394° F to
+1435°F) with 0.1° or .01° resolution. The instrument
features:
1. Front Panel switch selection of Fahrenheit or
Celsius readings.
2. Switch selectable RTD inputs.
3. Switch selectable input line voltage.
4. Dual slope measurement techniques.
5. Digital linearization of the RTD inputs.
1-3. DESCRIPTION
1-4. The instrument display features seven, high-
intensity, seven segment LEDs, and leading zero
suppression. Six of the LEDs are used to display numeric
data, with a minus sign for negative temperature readings.
The remaining LED displays the selected temperature
scale character (°F or °C).
1-5. A four connection, screw-type terminal block is
provided on the removable Input PCB for RTD
connections. Input switch settings on this module will
determine the microcomputer program necessary to
linearize the desired RTD’s input. A precision, four-wire
resistance measurement of the RTD is routed through
this module to the thermometer’s input circuitry.
1-6. Selection of the temperature scale for display is
made with a front panel pushbutton. The scale selected,
Celsius or Fahrenheit, is displayed as the last character in
the temperature reading (°C or ° F). A scale change can be
made at any time, and has no effect on calibration of the
instrument.
1-7. Options and accessories available for the 2180A are
listed in Table 1-1. More information concerning these
items is given in Section 6 of this manual. Option and
Accessory Information.
1-8. The measurement range of the 2180A Digital
Thermometer is determined by the type of RTD used as
the input device. RTD Types and total instrument
accuracy
specifications are listed in Table 1-2.
Linearization of the RTD input is accomplished through
toggling of the input switch segments on the RTD Input
Module. Switch positions, numbers and applications are
printed on the removable module beside the switch.
1-9. Four input line voltages are available for switch
selection. Selection may be made for 100,120,220, or 240
volts ±10% as required to meet local conditions. Fre­
quency may vary between 50 and 440 Hertz for all voltage
selections. Refer to Section 4 of this manual when
changing the selected input line voltage. Refer to Section
2, “Input Power” for 12 volt dc operation.
1-10. SPECIFICATIONS
1-11. Specifications for the 2180A Digital Thermometer
are given in Table 1-4. These specifications assume that
microcomputer type #2 has been installed in your instru­
ment and at power-up the display reads “8002.2”
1-1