D
x
Telemetry System
Manual Vers. 2.7
27
/
92
3.6.3 Define a Sample Rate
Each channel of one D
X
system is assigned the same sample rate
(except additional channels
Reference Temp.
and
Supply Voltage
).
If you intend to change the sample rate of the D
X
telemetry system, each SCT has to be
reprogrammed individually. To do this, follow the steps described below for an arbitrary
channel of each SCT. When programming a new sample rate, make sure that all SCTs are
ready-to-receive.
Select the menu item
Cha
nnels→Device 1 →Channel 1_
Y, with Channel
1_Y
being an
arbitrary channel of
Device 1
(except additional channels
Reference Temp.
and
Supply
Voltage).
With
Sample Rate,
select the desired sample rate. If the sample rate of one channel has
been defined, the value selected is automatically assigned to all other channels of this SCT
unit.
Please note:
Bandwidth of the D
X
telemetry system is split among all SCTs. Therefore, the
maximum sample rate depends on the total number of channels and SCTs The cutoff
frequency of the 6 pole anti-aliasing filter with Butterworth characteristics is automatically set
to 1/5
th
of sample rate (-3dBs). The additional channels 7 and 8 for reference temperature
and supply voltage are sampled at a rate of 25 Hz. They do not charge bandwidth of the
channels 1-6.
