ADM-870C 07/14/0916
5.0 USING THE AIRDATA MULTIMETER
5.1 GENERAL USE
The ADM-870C keypad has eight keys, five of which are dual-purpose keys. The dual-purpose keys are OFF/ON,
AUTO/READ, CLEAR/STORE, UNITS/ASSOC, and DENS/MODE. The functions shown in the lower, dark colored section
of each key may be activated by pressing the desired key. The functions in the upper, silver colored sections of the keys
are accessed by first pressing the SHIFT key, then the key of the desired function.
Press the ON key to turn the meter on. The meter will display a row of pixel blocks to test the display, and will then display
AUTO ZERO while performing a brief internal calibration test.
The MODE key may be pressed repeatedly to select one of the following measurement modes: temperature, VelGrid
velocity, AirFoil probe velocity, pitot tube velocity, differential pressure, absolute pressure. Selecting the FlowHood air flow
mode is discussed in the next paragraph. When a mode is selected, the meter will briefly display the mode, followed by a
two-letter symbol for the units to be used, and then display READ. For example, if the mode selected is pitot tube, the
message would read PITOTUBE briefly, followed by FP READ.
If the FlowHood flaps plug has been plugged into the meter, the meter will initialize in the FlowHood measurement mode,
and will display FLO-HOOD briefly, followed by CF READ. Press the Mode key repeatedly while the flaps plug is connected
to cycle the meter through the only measurement modes which are appropriate when the meter is used on the FlowHood
assembly. These modes are temperature, absolute pressure and air flow.
Press the READ key to take a reading in the selected mode. The meter will briefly display the selected function again,
followed by the measurement result. Pressing the READ key again will trigger another measurement, which will clear all
previous data from the display and display the new result.
The display has a back-light for use in low-light conditions. The back-light may be turned on or off by pressing the ON/OFF
key while the meter is turned on. The display will read LIGHT ON or LIGHT OFF as appropriate. The third character in
each READ display is replaced by a schematic light symbol (
') when the light is on.
Note that using the back-light significantly increases the drain on the batteries and reduces operating time (continuous
reading operation) by about 50 percent. The back-light may not be turned on when the battery charge is very low. The
display will read NO LIGHT/BATTERY/TOO LOW.
The back-light will turn off automatically if the meter has not been used for several minutes. Press any key to turn the light
back on.
The meter is turned off manually by pressing the SHIFT key, and then pressing the OFF key. The meter will turn itself OFF
automatically to save battery power if the meter has not been used for several minutes, unless there are stored readings
in memory or the meter has been placed in TREND mode.
The meter saves any readings stored in memory, the measurement mode (pitot tube or differential pressure, for example)
and the type of units (English or metric) during a normal shut-down, and will default to the stored settings when turned on
again. The last reading stored in memory will be displayed.
Information stored in memory will be saved in blocks of 50 readings if the meter must be reset while readings are in memory.
If the meter was turned off, then on again, while readings were in memory, but prior to resetting the meter, all readings
saved prior to turning the meter off will remain in memory after the meter is reset.
The AA NICAD batteries supplied with the meter are capable of supplying power for more than 3000 readings after one 10-
hour charge. When the batteries are nearing the end of their useful charge, the meter will begin displaying LOCHARGE
and the symbol of a discharged battery cell will appear in the third block of the displayed reading. The operator should act
to complete the reading session when LOCHARGE is displayed and record any readings in memory that might be lost if
the meter were to run out of power and shut down automatically due to extremely low charge.
If the meter is being used with the back-light turned off, the user will have approximately 20 minutes of runtime before the
meter displays RECHARGE/SHUT DOWN and turns itself off. The time period will vary depending on prior use. The
batteries must be recharged prior to further use.
If the meter is being used with the back-light turned on, the user will have approximately 5 to 20 minutes of runtime before
the meter displays RECHARGE/SHUT DOWN and turns itself off. The time period will vary depending on prior use. The
meter may be turned back on without the back-light and used until LOCHARGE is displayed. The status character
To Next Page
Need help?
General
