Table of Contents
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.
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.
Monopolar testing
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.
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.
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.
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.
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.
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.
NO. All BIOAMPS are battery powered.
Battery run time before change-out depends on the number of
channels. Most BIOAMPS will run for a
minimum of 20 hrs.
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.
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.
Our shipping address is:
SA Instrumentation Company
10441 /E Roselle St.
San Diego, CA 92121