HARVARD 50-9513, Инструкция по эксплуатации и техническому обслуживанию

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4
Operating Procedure
Please note the “Important Notice” on page 2
The instructions that follow are for use with the Modular Universal
Oscillograph and the Student Oscillograph. To use the Isolated
Preamplifier with the Harvard Electrophysiological Teaching Unit,
please refer to the instruction manual supplied with that unit.
Points About Recording with Electrodes
Human Subjects: First, always clean the area of electrode applica-
tion with surgical spirit or similar, to remove grease, dirt, grime etc..
When using Coupland-Davis type electrodes or ANY type of needle
electrode ALWAYS STERILIZE THE ELECTRODES BEFORE AND
AFTER USE ON EACH SUBJECT to reduce the chance of skin
infections or blood-carried diseases being transmitted.
Always ensure that the electrodes are clean. This reduces noise on
your chart recordings.
Choose the siting of the electrodes carefully. Avoid areas of excess
fat (fat will reduce the amplitude of your signals).
Animal Subjects: If you are using needle electrodes, there is a
chance that a small DC voltage will develop at the electrode site
which may well “swamp” the input of the amplifier, causing the sig-
nal to get progressively smaller until it finally disappears. This can
be countered by connecting the 50-8390 Harvard Capacitor Box
between the electrodes and the Isolated Preamplifier.