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World Precision Instruments
Output Connections
The output from each Iso-DAM8A module is available on the rear panel from a
standard BNC connector or all channels are available at the 25-pin connector. See
Fig. 6 for pin designations. The Iso-DAM8A output is suitable for application to any
recording or data acquisition device.
Grounding
Proper grounding is critical to successful biological signal monitoring. The optimum
grounding configuration is the “single-point ground,” in which each component of a
monitoring setup is connected to a single point which is connected to earth or mains
ground. This grounding configuration is used in
Fig. 6 and Fig. 7.
Shielding
The isolation feature of the Iso-DAM8A minimizes, but cannot eliminate, noise pickup
from electric distribution lines, fluorescent lights, computers, motors, radio frequency
transmitters, microwave ovens, etc. Use of shielded wires for input connection is
necessary if the subject is located more than a few inches from the amplifier inputs.
Even the use of shielded wires and proper grounding may be insufficient in a high
electrical noise environment, particularly if high impedance electrodes are used, if the
signal level is low (less than 100mV or so), or if high frequency response is required. In
these situations, the use of a metal shield, known as a Faraday cage, which encloses
the subject and the headstage may be necessary.
Idle Settings
If you are not certain what settings are required, the following settings are a good
starting point:
PROBE SELECT: GND
LOW FILTER: DC
DC OFFSET: OFF
GAIN: 10
HIGH FILTER: 10 kHZ
NOTCH FILTER: OFF
POSITION: Mid-range
POWER: OFF
Control Adjustment
After connecting inputs and outputs, the amplifier can be turned on. The POSITION
control may be used to establish a baseline setting on the recording device. It is
normal to set this control so that the recording device indicates zero when the PROBE
SELECT is in the GND position. The PROBE SELECT switch should be set appropriately
for the setup.
•
If the headstage is used, set the switch to PROBE.
•
If direct connection is made to the Iso-DAM8A input, set the switch to INT.
Summary of Contents for Bridge-8
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