Honeywell KA 54 - Manual (Page 48)

N
KRA 405B RADAR ALTIMETER INSTALLATION MANUAL
Page 2-22
006-10536-0010 Rev. 10 Oct/2005
(4) Simulated Altitude Test Procedure
The Simulated Altitude Test Procedure is to be used by the
installer to test associated systems that interface with the
KRA 405B. In the Simulated Altitude Test Mode, all outputs
of the KRA 405B operate normally, except that they are con-
trolled by a test input voltage rather than altitude. This
test voltage controls all analog and digital outputs, and all
three trip points.
a. Enter the Simulated Altitude Test Mode by pulling the
ALTITUDE TEST EN1 and ALTITUDE TEST EN2 lines low, ≤
3.5V. (EN1 is pin n, EN2 is pin s, and Altitude Test
Input is pin m). The KRA 405B outputs will now be con-
trolled by the voltage applied to the ALTITUDE TEST IN-
PUT pin on the circular connector.
b. The test voltage range is from 0 to 25 volts, with 0
volts corresponding to 0 feet, and 25 volts correspond-
ing to 2500 feet. Slowly run the test voltage from 0
to 25 volts, and back down to 0 volts. Confirm that the
altimeter indicates a corresponding change in altitude
(0 feet to 2500 feet, and back to 0 feet), and that the
DH Lamp illuminates at the appropriate time.
c. Remove the low from the ALTITUDE TEST EN1 and EN2 input
lines. This returns the KRA 405B to the Operational
Mode. Voltages on the ALTITUDE TEST INPUT line will no
longer affect the indicated altitude.
2.7 REMOVAL AND REPLACEMENT
A. KRA 405B RECEIVER/TRANSMITTER
(refer to FIGURE 2-6 KRA 405B INSTALLATION DRAWING for details)
(1) Removal
a. Detach mating coaxial cables from XMIT (P4052) and RCVR
(P4053) TNC connectors on the front of the unit.
b. Detach mating cable from Cannon connector (P4051) on the
front of the unit.
c. For Rack Mount, follow procedure outlined in step 1,
For Shock Mount and Direct Mount, follow procedure out-
lined in step 2,