Adjustments; Connecting A Microphone To The Audio Input Module; Figure 2-47 Jumper Setting For Low Pass Or High Pass Filter; Figure 2-48 Cmrr Adjustment - Honeywell VideoBloX User Manual

VideoBloX MODULES
Place the jumper in the position shown as "Low Filter On" to enable the low pass filter
function. This reduces the level of signals above 6000 Hz

Figure 2-47 Jumper Setting for Low Pass or High Pass Filter

Adjustments

Gain Adjustment
Adjust the gain control on the front panel to an optimum level for each input. This level
will result in a bright LED indication for "Signal", with only occasional flashes of the "Peak"
LED when the input signal is at the maximum expected level.
CMRR Adjustment
This adjustment sets the common mode rejection for the balanced inputs. It is factory
calibrated and should not be adjusted by the user. The optimum level is that where a
minimum output signal is obtained when both + and - input signals are driven by the
identical

Figure 2-48 CMRR Adjustment

Connecting a Microphone to the Audio Input Module

The following diagram shows how to connect a microphone to the Audio Input Card. Set
the phantom power jumpers on the audio input module as described in the
Power and 20dB Pad Jumpers
34
signal (inputs shorted).
section.
Phantom