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4.7 Dynamic Calibration Adjustment Procedure:
1. Construct a wiring harness per the wiring harness diagram. (This harness may
beordered directly from Trans-Cal Industries. Please specify 9 pin or 25 pin
connector. Request P/N: 881404.)
2. Connect the digitizer, computer and altimeter as shown in the test set-up
diagram,and energize.
3. Open the Hyper Terminal program as described in §4.5.
4. The digitizer output should now be displayed on the PC screen with 10
footresolution.
(You may use the Hyper Terminal "Clear Screen" function to remove any extra
characters that may be cluttering the screen. Click on Edit then click on Clear
Screen.)
Note: Backspace does not function in Hyper Terminal. If a typing error occurs,
hit <enter> and begin again.
5. Set the altimeter barometric input to 29.92 In. Hg. Change the input pressure
to -1000 feet and begin to compare the altitude digitizer output, as displayed
on the computer, to the altimeter reading at every 1000 foot mark. When the
digitizer output begins to differ from the altimeter by more than ±30 feet
begin to change the digitizer error curve. (§4.9 provides a table to record the
changes implemented.) (Note: no digitizer correction is possible at the -1000
foot mark.).
6. Type <enter> the Digitizer will respond with ?>(current altitude).
7. Type ADJ <enter> The computer will respond with A=.
CAUTION: Always refer to the altimeter and VSI manufacturer's data for maximum rate
of climb or descent and any special test conditions which must be complied with.
-18-
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