Table of Contents

1. How do I use the CALIBRATION function?
2. How do I use the Headbox Impedance Meter?
3. What do the ELECTRODE MONITOR LED(s) indicate?
4. What is the "REF" LED on the front panel?
5. What does the LO-BAT LED indicate?
6. What does the FAIL LED indicate?
7. What is the SYSTEM STATUS and what does it indicate?
8. Can I use AC to power the BIOAMP?
9. How long can I expect the BATTERIES to last?
10. Can I use BIPOLAR & MONOPOLAR inputs simultaneously?
11. How do I select GAIN, HPF & LPF settings?
12. If I need to return my BIOAMP for service where do I send it?

How do I use the calibration function?

There are two ways to use the calibrator. First with the Headbox test-cable. The second
is to use the Bioamp test-cable.

A HEADBOX cable is used when overall end-to-end system testing is desired, simulating
system inputs (normally an E-CAP) and producing predictable CALIBRATOR test-signal
outputs. Follow these steps.

1. Plug the HEADBOX CAL-CABLE into the E-CAP/CALIBRATION sub-D connector
   located at the side of the HEADBOX on one end; plug the other end (mini phone plug)
   into the CALIBRATION SOURCE jack.
   
2. Place the 3-position switch of each channel into the REF position.
   
3. Turn the CALIBRATION switch on the BIOAMP to the desired level and/or frequency (if applicable).

A BIOAMP cable is used to test the BIOAMP alone, without the HEADBOX connected.
If the system fails to function with the end-to-end HEADBOX calibrator test-cable , this
BIOAMP test will determine if the failure is in the HEADBOX and / or it's cabling - or due
to the BIOAMP itself.

1. Plug the appropriate end of the BIOAMP CAL-CABLE into the input connector(s) of the BIOAMP
   (located on the front of 8-24ch models; rear on 8-64+ ch models); plug the mini phone plug end
   into the CALIBRATION SOURCE jack located on the front of the BIOAMP (all models).
   
2. Turn the CALIBRATION switch on the BIOAMP to the desired level and/or frequency (if applicable).

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How do I use the Headbox Impedance Meter?

Monopolar testing

1. REFERENCE ELECTRODE: Move ALL mode switches to GND; then press and hold the REF
   push button. The meter reading is the "Z" of the REF electrode as compared to all other electrodes
   paralleled together, thus displaying an accurate direct-reading figure for the REF "Z".
2. GROUND ELECTRODE (ISO-GROUND): Move ALL mode switches to GND; then press/hold the
   GND push-button. The reading is the "Z" of the GND electrode compared to all other electrodes
   paralleled together, again displaying an accurate direct-reading figure for the GND "Z".
3. (+) SIGNAL ELECTRODES:  This is for measurements when in the classic monopolar
   configuration where E-CAP signal electrodes are amplified against a REF buss (switches in REF);
   or where a (+) jack input has an electrode and the (-) jack is open AND it's switch is in the REF
   position (the (-) input is on buss); perform the following:

On the channel under test, switch to REF position, ALL others to GND; then press/hold this
channel's Z-TEST microbutton (use the stylus tool) for a direct "Z" reading; again compared
to all other electrodes together;

OR

if during data collection when most or all mode switches are in REF, a specific electrode
can be tested without moving all channels back into the GND position; this by press/holding
it's "Z" test microbutton for a "Z" reading and then subtracting from it the algebraic sum of the
previously determined REF & GND "Z" for a final figure;

OR

move the other 11 switches in the row of the electrode under test to GND, then press/hold
it's "Z" microbutton for a "Z" reading. This reading however will be ~10% hi and by taking this
into account, the final figure can be readily determined.

BIPOLAR ELECTRODES

This is for measurement of electrode sets where both inputs jacks of a channel are used and the mode switch was
set on OPEN; a direct "Z" reading is produced. First set the test channel's mode switch to REF; ALL OTHER
CHANNEL MODE SWITCHES MUST BE IN GND. With the (-) jack left unconnected, plug the electrode under test
into the (+) jack; then press/hold the "Z" test microbutton for the reading. Test other electrodes in the same
manner utilizing the (+) jack. The meter reading is the "Z" of the test electrode as compared to all other electrodes
paralleled together, thus displaying an accurate direct-reading figure.

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What do the ELECTRODE MONITOR LED(s) indicate?

A LED for each channel will flag high DC levels - indicative of a poor electrode connection, a lead-off,
or an internal problem within the channel.

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What is the "REF" LED on the front panel?

Indicates the intensity at which an ELECTRODE MONITOR must glow to indicate signal blocking -
a situation requiring electrode maintenance.

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What does the LO-BAT LED indicate ?

Will indicate if voltage is <+/- 5.75 indicating a recharge is due within ~1/2 hr; this LED will flash when
batteries are overloaded due to multiple open inputs.

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What does the FAIL LED indicate?

Will indicate when the BIOAMP has shut itself down; this is due to multiple input overload or opens,
internal electronic failure or a battery voltage <+/- 5.60 V, any of which can produce distorted data signals
unknown to the operator.

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What is the SYSTEM STATUS and what does it indicate?

A consolidated TTL output "STATUS" line remotely flags: LEAD-OFF, LOW BATTERY, FAIL and POWER OFF;
therefore when this line is low (0V / LED off), one or more of these events has occurred. This isolated TTL line
is current limited @ 2mA for direct-driving a STATUS LED indicator if desired.

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Can I use AC to power the BIOAMP?

NO. All BIOAMPS are battery powered.

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How long can I expect the BATTERIES to last?

Battery run time before change-out depends on the number of channels. Most BIOAMPS will run for a
minimum of 20 hrs.

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Can I use BIPOLAR & MONOPOLAR inputs simultaneously?

Yes, with our MFHB (multi-functional headbox) and the 3-position switch option. This allows the user to
switch each channel into one of three modes: GROUND, OPEN, and REFERENCE.

1. The OPEN mode allows for Bipolar input.
2. REFERENCE mode switches the negative input of the selected channel(s)
   to the reference buss for MONOPOLAR configurations. The REFERENCE electrode
   is then connected to the REF jack on the headbox.
3. In the GROUND mode the bipolar channel inputs are switched to ground.

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How do I select GAIN, HPF & LPF settings?

First, select the proper set of switches for the channel(s) whose setting(s) you want to adjust.
Next, rotate the appropriate switch (i.e. GAIN, HPF or LPF) to one of the four available settings.

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If I need to return my BIOAMP for service where do I send it?

Our shipping address is:

SA Instrumentation Company
10441 /E Roselle St.
San Diego, CA 92121

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Created by SAI
Copyright © SA Instrumentation. All rights reserved.
Revised: January 17, 2001.