Offset Adjustment
Offset Adjustment
A potentiometer is provided to allow setting the output voltage / current of the amplifier to
zero for zero commanded input. Turning the potentiometer to the right (clockwise)
increases the offset, making the value more positive.
Offset Adjustment Procedure
The setting of the offset to zero requires a few special tools.
•
Multimeter
•
Small screwdriver
To set the offset of the amplifier to zero, follow the procedure shown below:
1. Command a zero input to the amplifier or short the command input pins together
(remove the input connections to prevent damaging the signal source).
2. Connect a multimeter to the output terminals of the amplifier.
3. Adjust the potentiometer until the meter reading displays zero (0.0V)
4. The output of the amplifier should now provide zero voltage / current when the
command is zero. Be sure to remove the short across the input pins of the amplifier if
Power Amplifier Module User's Guide
27
Figure 10. GND connection.
Figure 11. Offset
adjustment.
Offset
Adjust
