Ramsey Electronics MR6 Manual de Instruções descarregar pdf (Página 21)

ECG1 • 21

monitor. Feel free to experiment with other electrode positions. One of the

favorites around the lab here is the “valley” method. The ground probe is

placed on the stomach or wrist and the differential probes placed at the base

of the sternum and the other just below the neck line.

The newlyweds have also come up with a method of placing a differential

probe on each chest while the ground is placed on one wrist, and listening for

the two sets of ECG waveforms. A tight embrace is required to “equalize the

ground potential” between the love birds.

OSCILLOSCOPE HOOKUPS

Your ECG kit has been equipped with an output jack exclusively for hookups

to connect your monitor to an oscilloscope. Simply fabricate a hookup cable

that adapts from a 3.5 mm (miniature) type monaural plug (with the center

lead being wired as the signal input) to the connector type of your scope. Set

your vertical amplifier on the scope to 0.5 volt/division and set the sweep time

to 0.5 to 1 second per division. Now sit back and observe the ECG waveform.

This is by far the most fun method of

operation, and lends itself well to the

current “handheld “ portable scope

meters as well as digital scopes. By

changing the probe positions you can

notice changes in the ECG waveforms

and begin to investigate the attributes of

the different positions.

TROUBLESHOOTING GUIDE

If your ECG1 does not work at all, re-check the following:

• correct orientation of U1 and U2 (see PC board layout diagram)

• You should be able to measure the voltage on the supply pins of both

IC’s. Check for 9 volts at pin 8 of the LM386 and Pin 4 of the LM324.

Make sure that the ground connections are soldered securely as well.

• correct polarity of all electrolytic capacitors.

• correct orientation of diodes D1 and D2

• all solder connections

• Jumper wires at all JMP locations.

Still having trouble?

ECG Monitor

1 2 ... 16 17 18 19 20 21 22 23 24

Sem comentários

Ramsey Electronics MR6 Manual de Instruções Página 21