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IM133, Page
5. High Pass Filter
This function selection provides for enabling or disabling the built-in 10 Hz 4-pole Butterworth High-
Pass filter. The following messages will be shown sequentially on the LED display each time the up-
down EDIT push buttons are pressed: (1) “OFF”, and (2) “10.0”.
1. "OFF": High-pass filter disabled.
2. "10.0": 10 Hz high-pass filter enabled.
The “Function LED” corresponding to the High-Pass Filter function will remain OFF during the normal
mode of operation if the user selected the “OFF” setting (filter disabled). The function LED will remain
ON if the high-pass filter was enabled by selecting the “10.0” setting.
6. Low Pass Filter
This function selection provides for enabling or disabling the built-in 4-pole Butterworth Low-Pass
filter (set by header module 31875). The following messages will be shown sequentially on the LED
display each time the up-down EDIT push buttons are pressed: (1) “OFF”, and (2) “XX.XX”.
1. "OFF": Low-pass filter disabled.
2. "XX.XX”: Low-pass filter enabled. XX.XX represents the corner frequency in kHz.
The “Function LED” corresponding to the Low-Pass Filter function will remain OFF during the normal
mode of operation if the user selected the “OFF” setting (filter disabled). The function LED will remain
ON if the low-pass filter was enabled by selecting the “XX.XX” setting. XX.XX could be a value from
0.01 (10 Hz) to 80.00 (80 kHz). The unit displays the actual corner frequency in each channel by
reading an ID Voltage (V
ID
) set by the header module that sets the -3dB corner frequency of the
low-pass filter. V
ID
ranges from 0 to 2 VDC. The unit uses the table shown in section 10.0 to convert
the ID Voltage into the corner frequency (in Hz).
7. Monitoring State
This function selection provides for programming the desired state of the amplifier while in the normal
mode of operation. The following messages will be shown sequentially on the LED display each time
the up-down EDIT push buttons are pressed: (1) “EU”, (2) “V out” and (3) “OFF”.
1. "EU": RMS voltage at V out is monitored and shown on the LED display in EU at the rate of
approximately two (2) times per second. The values displayed on the LED display range
from 0.000 to 9999. The value shown on the LED display is computed as follows:
Display (EU) = VRMS at Output / Output Scaling
2. "V out": RMS voltage at V out is monitored and shown on the LED display in VRMS at the
rate of approximately two (2) times per second. The values displayed on the LED display
range from 0.00 to 9.99. The value shown on the LED display is computed as follows:
Display (VRMS) = VRMS at Output
3. "OFF": The LED display will be turned OFF. This setting provides the lowest noise
performance.
The “Function LED” corresponding to the Monitor function will remain OFF during the normal mode
of operation if the user selected the “OFF” setting. The function LED will remain ON if monitoring
was enabled by selecting any of the other settings listed in the table above.
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