Operating Instructions - CPA2501
25
Air Data Test Indicator
CPA2501
6.4.1.1 Pressure Mode / Emulation Mode
The Mode button is active only if the CPA2501 is not in Air Data Mode and there is an optional baromet-
ric reference installed. Otherwise, the mode button becomes a label (figure 6.4.1.1) indicating the native
mode of the transducer (absolute or gauge). When an optional barometric reference is installed, a native
gauge transducer can emulate absolute pressure using the barometric reference. Alternatively, a native
absolute transducer can emulate gauge pressure. Emulation can be activated simply by pressing the
Mode button.
Figure 6.4.1.1 - Mode Label
6.4.1.2 Auxiliary Displays
The screen in figure 6.4.1.2 shows all of the possible auxiliary display items that can be included in the
Measure App. In addition, each channel can contain one of two possible calibration functions. The aux-
iliary display item includes “Peak”, “Rate” and “Alternate Units”. Calibration functions are either a “Zero”
button or a “Tare” button. These auxiliary features will appear in the Measure App when selected from the
Transducer App (section 6.4.4).
Figure 6.4.1.2 - Measure App with auxiliary displays
Without a
barometer the
mode button
becomes inactive