Hold - GE Druck ADTS 405 R/F Mk2 Instruction Manual

Chapter 6. REFERENCE AND SPECIFICATION
To use the rate timer:
1. Press RATE TIMER.
2. Press F1, F2 or F3 to select the required WAIT and TIME periods.
The main pressure displays shows the WAIT or TIME period counting down.
After timing, the timed average value, identified by a T directly to the right of the value,
replaces the instantaneous rate value. In measure mode the display changes to show the
timed rate of all associated parameters on the same screen. Pressing one of the set-point
keys (e.g., ALT, ROC, SPEED etc.,) or CLEAR/QUIT exits from this screen.
3. At any time during rate timing or when a timed value is displayed, pressing the RATE
TIMER key allows for either the restarting or canceling of the timing. When timing is
canceled, the rate displays return to instantaneous values.
4. The timed average value remains until a new aim is entered. During this time, it is possible
to view any parameter.
5. The WAIT and TIME periods can be changed using SETUP, RATE TIMER, providing SETUP
lock is not enabled.

6.2.8 HOLD

When HOLD is pressed, a changing pressure is instantaneously held. Pressing HOLD again releases
the pressure to continue to the aim value. The HOLD facility applies to both channels
simultaneously. Two examples of how the HOLD facility can be used are shown below:
Example 1 - Airspeed switch test
a. Take the airspeed to a value just below the expected trip point.
b. Enter a low rate of speed.
c. Enter a new airspeed aim above the trip point.
d. Immediately the switch trips, press HOLD. (see 6.2.8 HOLD for more details)
e. Read the airspeed value - this is the trip value for increasing airspeed.
f. Enter a new airspeed aim below the expected trip value.
g. Immediately the switch trips, press HOLD.
h. Read the airspeed value - this is the trip value for decreasing airspeed.
i. Press HOLD again to release hold.
Example 2 - Start both Ps and Pt ramping to new aims simultaneously
For both channels to start moving to new aims at the same time, use the following sequence:
a. Press HOLD.
b. Enter Ps channel aim.
c. Enter Pt channel aim.
d. Enter required rates.
e. Press HOLD again to release hold.
f. HOLD is automatically released when entering Measure Mode.
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