Recording Waveforms with the
Harvard Student Oscillograph
Numbers in brackets, e.g. (1), (2) etc. refer to Fig. 1 on page 3.
Letters in brackets, e.g. [A], [B] etc. refer to Fig. 6 on page 11 and
Fig. 13 in the Student Oscillograph Instruction Manual.
1)
Have you read the complete Operating Procedure section?
2)
Check that the Isolated Preamplifier is fitted with batteries
(see page 12).
3)
Refer to Fig. 2, 3 or 4 on pages 5, 6 and 7 to apply the elec-
trodes to your subject.
4)
Connect the electrodes to the Isolated Preamplifier using
either the 3-lead input cable or the ECG limb cable.
5)
With reference to the Harvard Student Oscillograph
Instruction manual section 3.4.0, follow steps 1 to 13 inclu-
sive.
6)
Connect the Isolated Preamplifier to the INTERFACE socket [S]
on the Student Oscillograph.
7)
Check that the battery indicator (1) on the Preamplifier is in
the green zone. If it is not, refer to page 12.
8)
Set the Preamplifier’s AC/DC switch (5) to the DC position
and set the filter switch to 15 kHz.
9)
Set the Preamplifier’s GAIN switch (6) to 10 and select posi-
tion I on switch (2).
10)
Set Oscillograph’s AC/DC switch [N] to DC, the chart speed
control [L] to 2.5 and the chart drive lever [A] to ON.
11)
Adjust the Oscillograph’s GAIN control [M] to about 1.
The pen will move on the chart.
12)
Adjust the Preamplifier’s DC LEVEL control (3) until the pen
returns to its central position on the chart. At this point you
should see a small waveform on the chart.
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