Information subject to change
96-8005549_3-18-21
8508 OPERATOR’S MANUAL – SECTION 6
20
with DIP switch settings will be sufficient for many
applications, this compensation setting may also
be adjusted in the field by installing a custom com-
pensation network. The following section describes
methods for determining proper compensation
requirements when operating in Controlled-Current
mode.
6.1.3 Controlling Compensation for
CC Operation
AE Techron 8500 series amplifiers can be config-
ured for either Controlled Voltage (CV) or Con-
trolled Current (CC) mode of operation. When
operating the amplifier in Controlled Voltage (CV)
mode, compensation is not required. However,
when operating in Controlled Current (CC) mode,
the amplifier load becomes an integral part of the
system. In order to ensure system stability and
to control available bandwidth, compensation via
an RC network is required for CC operation. The
following steps will show you how to determine the
proper compensation values for your load to allow
you to operate your amplifier in CC mode safely
and effectively.
STEP 1: Check Amplifier Operation in CV
mode.
We recommend that you power-up and enable the
amplifier in Controlled Voltage mode without at-
taching a load before configuring your amplifier for
Controlled Current operation. This will allow you
to verify that the input signal and the amplifier are
operating correctly.
Once this initial check is completed, power down
the amplifier, attach your load, and move the
Operation Mode DIP switch (SW#4, located on
the Master amplifier module’s back panel) to the
DOWN position to place the amplifier in CC mode.
STEP 2: Determine Required Compensation.
When operating an amplifier in Controlled-
Current mode, the load becomes an integral part
of the system. In order to determine the required
compensation for your load, consulting the follow-
ing table to determine the approximate compen-
sation capacitance (CC) required based on the
inductance of your load. Note that these calcula
-
tions are based on empirical measurements and
are approximate.
NOTE: Load Resistance (R) is assumed to be
<5 ohms.
Load
Inductance (L)
Compensation
Capacitance (CC)
Compensation
Network
75 µH to 1 mH
0.0022 µF
Network 1
1 mH to 5 mH
0.0100 µF
Network 2
Figure 6.3 – Selectable factory-installed compensation networks
Summary of Contents for 8500 Series
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