Information subject to change
97-8004167 07-14-17
7224 & 7226 OPERATOR’S MANUAL –
SECTION 6
28
If your load inductance is between 200 microHen
-
ries and 1 milliHenry, and your load resistance
is less than 5 ohms, then you can likely use the
default compensation provided by the amplifier’s
factory-installed RC network. To select the factory-
default compensation, please see
STEP 4
below.
If your load inductance falls outside of the mid-
range, or if your load resistance is greater than
5 ohms, then you must calculate your required
compensation. If, after calculating your required
compensation, you determine that the default com-
pensation will be insufficient for your load, then
you will need to enable and install a custom RC
network. See
STEP 6
below.
AE Techron 7224 or 7226 amplifiers can be
enabled with one of two compensation settings:
default RC network or custom RC network. The
required network can be selected via jumpers on
the main board. CC1 enables the default (factory-
installed) RC network, while CC2 allows installa
-
tion of a custom RC network.
Figure 6.9
describes
the default RC circuit.
To select CC1, place jumper J5 in the UP posi
-
tion; to select CC2, place jumper J5 in the DOWN
position. (For jumper location, see the
“Advanced
Configuration”
section.)
IMPORTANT: If CC2 is selected, you must cal
-
culate the compensation requirements for your
custom RC network and install the network on
your amplifier main board before operating the
amplifier in CC mode.
If desired, the following values of the components
contained in the default RC network can be used
with the formulas provided in
STEP 6
below to
verify the suitability of the default compensation for
your uses.
Pins Jumped:
1 and 2 (UP)
Compensation Resistor:
R63 (68 Kohms)
Compensation Capacitor:
C16 (0.047 µF)
Parallel Capacitor:
C11 (47 pF)
STEP 3: Determine if Default or Custom Compensation is Required.
STEP 4: Enabling Your Compensation Setting.
STEP 5: (Optional) Verify Suitability of Default Compensation (CC1)
STEP 6: Installing an RC Network for Custom Compensation
If the default RC network does not provide suit-
able compensation for your intended load, you
will need to install a custom RC network that is
matched to your load. This network will require two
components (a resistor (R) and a capacitor (C))
to be installed on the main board. To calculate the
approximate values required for each component,
use the following fomulas.
COMPENSATION FORMULAS:
To find the value for the resistor (Rc) in the RC
network:
Rc = 20,000 x 3.14 x L x BW
where:
Rc
is compensation resistance in ohms.
L
is load inductance in henries.
BW
is bandwidth in hertz.
To find the value for the capacitor (Cc) in the
RC network:
Cc = L/ (R x Rc)
where:
Cc
is compensation capacitance in farads.
L
is load inductance in henries.
R
is resistance of load in ohms.
Rc
is compensation resistance in ohms.
