WPI DAM50, Instruction Manual, Page: 6 / 16

2 World Precision Instruments
INTRODUCTION
Differential amplification is of great importance in bioelectric
recording to reduce the ever present effect of noise
interference from power line induction. A well designed
differential amplifier will significantly diminish power line
(mains) noise. It is most essential that the preparation be
connected with an electrode to a good electrical ground
as well as to the grounding wire of the DAM50 itself. This
should have the effect of greatly reducing electrostatically
induced potential. In addition to the preparation ground,
two differential input connections must be made via
appropriate electrodes applied to the recording site so as to
optimally record a bioelectric potential difference.
Parts list
Contents
DAM50 amplifier
3518 shielded cable (bare termination) (available in a package of two as P/N 3517).
300647 shielded cable for metal electrodes
Unpacking
Upon receipt of this instrument, make a thorough inspection of the contents and
check for possible damage. Missing cartons or obvious damage to cartons should be
noted on the delivery receipt before signing. Concealed damage should be reported
at once to the carrier and an inspection requested. Please read the section entitled
“Claims and Returns” on page 11 of this manual. Please contact WPI Customer
Service if any parts are missing at 941.371.1003 or customerservice@wpiinc.com.
Returns: Do not return any goods to WPI without obtaining prior approval (RMA
# required) and instructions from WPI’s Returns Department. Goods returned
(unauthorized) by collect freight may be refused. If a return shipment is necessary,
use the original container, if possible. If the original container is not available, use a
suitable substitute that is rigid and of adequate size. Wrap the instrument in paper or
plastic surrounded with at least 100mm (four inches) of shock absorbing material. For
further details, please read the section entitled “Claims and Returns” on page 11 of
this manual.