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21
8508 OPERATOR’S MANUAL – SECTION 6
STEP 3: Enable Compensation Network
If your load inductance is between 75
μ
H and 1
mH, and your load resistance is less than 5 ohms,
then you can likely use Compensation Network
1 for your application. If your load inductance is
between 1 mH and 5 mH, and your load resis
-
tance is less than 5 ohms, then you can likely use
Compensation Network 2 for your application.
(See
Figure 6.3
). These compensation networks
are enabled when Compensation Network 1 DIP
switch (SW#6) or Compensatlon Network 2 DIP
switch (SW#5) on the Master amplifier module is
set to the ON (UP) position.
If your load inductance falls outside of these
ranges, or if your load resistance is greater than 5
ohms, please contact AE Techron Technical Sup-
port for assistance.
STEP 7: Verifying Operation
Remember the load you are connecting is a
part of the system and the amplifier should not
be turned on without the load being connected.
After selecting and enabling your choice of Com-
pensation Network, check to ensure that the
Operation Mode DIP switch is set to CC (DOWN),
then power up the amplifier without signal input.
To begin testing, input a square wave with a fre-
quency of 100 Hz to 1 kHz, or a squared pulse at a
low level (typically 0.25 to 2.0 volts). A limited-rise-
time, repetitive pulse of low duty cycle is preferred.
Observe the output current through a current
monitor or current probe. Look for clean transition
edges. The presence of ringing or rounding on the
transition edges indicates compensation problems.
(See
Figure 6.5
.)
If a change in compensation is necessary, an ad-
justment to the resistor component of the Compen-
sation circuit is probably required.
If the output current waveform is ringing, the circuit
is under damped: You have too much compensa-
tion and should lower the resistance (see
Figure
6.6
).
Figure 6.5 – Compensation Effects on Waveform
Figure 6.6 – Square Wave Showing a
Decrease in R is Required
If the output current waveform is rounded, the
circuit is over damped: You have too little compen-
sation and should increase resistance (see
Figure
6.7
).
Figure 6.7 – Square Wave Showing an
Increase in R is Required
Summary of Contents for 8500 Series
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