ETTC'2003 - SEE

73
64
63
61
60
48
45
40
35
Level (dBuV/m)
2
25
34
100
150 1020 1100 1525 1680 5020 5100 6000
Frequency (MHz)
Maximum level of radiated RF interference.
Regarding the diagram, it can be noted that difficulties often occur with influence
of typical CPU clock (around 100 Mhz). The choice of power supply board is also
a key factor.
Appropriate user interface
In the frame of airborne applications, the graphic recorder is considered as a
peripheral. It is controlled by an upstream computer. The computer will condition
and process information from the measurement capture and acquisition stages.
In this philosophy, only a few controls are performed by the Flight Test Engineer
directly on the recorder. Its HMI is also simplified to provide reactivity.
On the other hand, recorder has to take into account a lot of real time
configuration settings from the upstream computer.
Monitoring
In a flight test installation, all components are monitored by a computer in charge
of maintenance.
The telemetry recorder will be equipped with an external control line to convey a
maintenance protocol.
This protocol will carry informations such as: warnings relevant to paper feed,
conditions of all discrete items of the system, result of power up self-test.
50
f < 25 MHz limit = - 4,558.log(f MHz) + 41,372
f > 25 MHz limit = 15,965.log(f MHz) + 12,682
53
57