Shortridge Instruments Airdata ADM-870 - Speed-Read Operation

ADM-870 05/23/0814
FlowHood, and very low readings of building or room air pressures.
The first reading taken after moving a sensor is not valid when using SPEED-READ and must not be relied upon.
At least two or three more readings would have to be taken to assure a stable readout. It is faster to take
individually triggered readings whenever the process requires changing positions.
5.4.1 SPEED-READ OPERATION
Hold the READ key down until SPEED is displayed. Release the READ key immediately when SPEED is
displayed and automatic fast readings will begin and continue until the sequence is interrupted by pressing the
READ key until HALT is displayed. (Release the READ key immediately when HALT is displayed or the reading
process will begin again). Pressing the READ key again will restart the SPEED-READ process. The SPEED-
READ function may be terminated while HALT is displayed by pressing the SHIFT key, followed by the CLEAR
key, or by turning the meter off.
The memory function may be activated while HALT is being displayed by pressing the STORE key. AUTOSTOR
will be displayed. Press the READ key and up to 100 subsequent readings will be entered into memory.
Backpressure compensated air flow measurements can not be made in the SPEED-READ function. Also, the
SPEED-READ function can not be entered directly following a change in the flaps position. This limitation is
designed to prevent accidental initiation of the SPEED-READ function while backpressure compensated
readings are being taken with the FlowHood.
SPEED-READ can not be entered when the flaps are closed, or when the meter is already in the memory mode.
However, SPEED readings can be made with the flaps closed by first starting SPEED-READ with the flaps open
and then closing the flaps. This allows very low flow readings during the proportional balancing process.