Shock Accelerometer
Page 16
002-096e-01.19
The current requirements can be calculated using the following
equation:
Where:
Never use more current than required to make the desired
measurement. Never exceed the maximum current.
If a requirement calls for 1,000 feet (300m) of cable and the
maximum frequency of interest is only 5 kHz than the user should
select (From Table 5) 5 mA of current rather than the 10 mA required
for the full 10 kHz range. As current is increased, the noise produced
by the Piezotron circuit will also increase. The miniature Piezotron
amplifier will produce more heat as current is increased resulting in
reduced life and reliability.
The specified maximum temperature range (in the data sheet) is based
on 4 mA of supply current. It is necessary to degrade the maximum
operating temperature when operating under increased temperature
conditions. The graph in Figure 12 shows the approximate maximum
temperature vs. operating current.
Figure 12:
Maximum PIEZOTRON Current as a Function of Operating
Temperature
Peak
Volts,
in
Output
=
Farads
in
e
Capacitanc
=
Hz
in
Frequency
=
Amperes
in
Current
=
E
C
f
I
fCE
I
2
