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IBVA V2

The Hardware instruction for professional & maintenance

The transmitter has one switch, an LED indicator light, a 1/8" mini jack output, a sensor jack, a wire antenna connector, and a battery compartment. The switch must be set to "On" to transmit the brainwave data. The LED will blink when a signal is being sent. Set the switch to "Off" whenever you are not using the IBVA system to record brainwaves; this will save battery power. The antenna should be unobstructed when possible and treated with care. The battery compartment slides open and the + and - positions are marked inside. The mini jack output is for recording your brainwave data to a recordable device, such as a portable cassette recorder or camcorder not directly connected to an A/C power source. Never connect the transmitter to a device that is directly plugged into an A/C plug. Only connect to a device that is powered from dry cell batteries. If you intend on connecting to an A/C power source please consult with a professional electrician to ensure that you will be isolated from the A/C power source. The sensor jack connects to the headband or optional sensor equipment.

sensor jack:
Analogue side:
we used special balanced DC coupling op amp, total Gain = 50,000 to 50,458.
Amplifier differential impedance is 10 T ohm,
Input Bias current is ¬±1.2 PA .. ¬±2 PA.
10 M ohm to 100 M ohm resistance input coupling.
0.16 Hz to 35 Hz -6 dB, 50 Hz to 60 Hz cut off -40 to -60 dB.
Common mode noise is up to 110 dB at 0..40 Hz.
Input Noise:
voltage noise
fB = 10 Hz to 10 KHz -> 0.6 ¬µ Vrms .. 0.7 ¬µVrms
fB = 0.1 Hz to 10Hz -> 1.2 ¬µ Vp-p .. 1.6 ¬µVp-p
Current noise:
fB = 0.1 Hz to 10 Hz -> 12 fAp-p .. 15 fAp-p.
fo = 0.1 Hz to 20 KHz -> 0.6 fA/*Hz .. 0.8 fA/*Hz
Input Noise that depend on source impedance at 10 Hz:
10M ohm: 400nV/*Hz, fB = 0.1 Hz .. 10 Hz -> 7.5¬µ Vp-p
1 M ohm: 120 nV/*Hz, fB = 0.1 Hz .. 10 Hz -> 2.4 ¬µ Vp-p
100 K ohm: 50nV/*Hz,fB = 0.1 Hz .. 10 Hz -> 1.2¬µ Vp-p

Digital side:
8 bit AD convertor 120 sample par second.
minimum input 0 micro V p-p generate number 0.
max input 100 micro V p-p generate number 255.
minimum digital resolution is 100 micro V p-p / 256 = 0.390625 micro V p-p generate number 1.

Electrode side:
we can get good signal even if skin and electrode impedance changed between 0 to 100 K ohm then 0.4 micro V p-p out put noise. this mean we can use different electrode easily.

1/8" mini jack output:
we can connect to 100 to 600 ohm microphone input and/or 10K to 100K ohm line input ( about 0.1V to 1V p-p for line input )
usually consumer product microphone input has auto gain control. When 1 ch recording is no problem, however when 2 ch recording mode, both channel will effect by auto gain control circuit. so we recommended to use 2 ch recording is connect to line input.
Need audio frequency range 500 Hz to 13 KHz, SN upto 40dB for recording brainwave as sound track.
Use 4 truck sound camcorder can record 2 ch brain wave data, 2 ch sound into sound truck and can record image.
Then can play back with 2 ch brain data, 2 ch sound and image.

Radio frequency:
ch 1 is 295 MHz.
ch 2 is 315 MHz (Blue Laval)
IBVA transmitter's radio power is very weak like environment radio noise in city. easy to get radio transmission err in case same frequency is broadcasting from any where, any reason. this case we need to adjust radio frequency that make different from environment radio noise.
The margin to adjust frequency is in between 280 MHz to 330 MHz. have to be use plastic radio high frequency driver for tune frequency adjust pot TC1 ( 10 pF ) and radio frequency analyzer. Pot will go around 360 degree, no problem to move around over 360 degree.
Usually no need to adjust this pot except the place to have similar radio frequency.

Zero offset:
Zero offset adjust pot VR2 ( 20 K ohm ) is for adjust 0 Hz voltage level = zero offset on the IBVA display. At factory setting this set is less than 0.4 micro volt.
in case you see more level in 0 Hz in the FFT display, then you need to adjust this pot. this pot is not 360 degree around, about 200 degree, so do not move around continually, not like frequency adjust pot.
Usually no need to adjust this pot.

On the front of the receiver there are two switches, one LED indicator light, and one 1/8" mini jack input. The left switch turns the receiver on and off. When you are using the IBVA program to record brainwaves this switch must be set to "On". When this switch is set to "Off" the receiver will act as a pass thru box, allowing you to use whatever device is connected to the Output port, like a modem or network connection.

The LED indicator light blinks fast and continuously when it is receiving a good signal and blips noticeably on and off when receiving a poor signal. The LED will only be lit when the IBVA program is open and the receiver is getting a signal.

The right switch selects an input mode. When "Tape" is selected the receiver will look for a signal from the 1/8" mini jack input. When "Ante" is selected the receiver will look for a signal from the wireless transmitter.

The 1/8" mini jack input is used for connecting to the playback output of a device such as a portable tape player or camcorder.

The top of the receiver is where the antenna is connected. The antenna is removable for easy portability. The back of the receiver is where the two serial port connections are. The Input port connects to the computer. The Output port is for connecting other serial devices such as a modem or printer.

Radio frequency:
ch 1 is 295 MHz.
ch 2 is 315 MHz
IBVA transmitter's radio power is very weak like environment radio noise in city. easy to get radio transmission err in case same frequency is broadcasting from any where, any reason. this case we need to adjust radio frequency that make different from environment radio noise.
the margin to adjust frequency is in between 280 MHz to 330 MHz. have to be use plastic radio high frequency driver for tune frequency adjust pot TC ( 10 pF ) and radio frequency analyzer. Pot go around 360 degree, no problem to move around over 360 degree.
Have to set same frequency as transmitter and receiver. so, first set transmitter frequency then set receiver frequency to get correct brain data in IBVA application. In case 2 ch mode, we recommended to set 2 frequency over 20 MHz difference.
Usually no need to adjust this pot except the place to have similar radio frequency.

Input threshold:
Input threshold adjust pot VR1 ( 20 K ohm ) is for adjust threshold level for incoming data, radio and line input to get good brain data. At factory setting this set is 10 K ohm to 100 K ohm, 0.1 V to 1 V p-p.
in case you can not get good signal in FFT display then you need to adjust this pot. this pot is not 360 degree around, about 200 degree, so do not move around continually, not like frequency adjust pot.
Usually no need to adjust this pot.

There are two types of headbands. A 1CH (one channel) version and a 2CH (two channel) version. They both read the frontal lobe of the head (Fp1 and Fp2). The 1CH version has one output wire and reads the brainwaves from both the left and right hemispheres (in between Fp1 and Fp2) of the brain but has no ability to distinguish what hemisphere the brainwaves come from. For example, if a high peak occurs at a specific frequency in the left hemisphere of the brain and a low peak occurs at the same frequency in the right hemisphere, only the highest peak will be displayed. The 2CH version of the headband has two output wires for the left and right channels and reads and separates the left and right hemisphere brain data, around Fp1 and Fp2 . The IBVA program can then record and display this information separately.

this map show other way to name location. for this way, one channel is in between F1 and F2. two channel is F1..F7 (right) and F2..F8 (left). body ground is Fz.

For measuring other head points, or other things, the included Pin Input Pak (3 pin adapter) allows you to use any kind of detection device that uses 2mm (.080") connection pins with the IBVA System. Examples of the types of input devices you can use: needle electrodes (ouch!), bar electrodes, disc electrodes, clip electrodes, ring electrodes, pin adapters, extensions, leads, ear clip electrodes, multi position head caps, etc.

The transmitter and receiver should be placed within plain sight of each other and as unobstructed as possible. You have approximately 30 feet of wireless operation space but the range will depend on the electrical environment the IBVA is in. When the transmitter is used with a fresh alkaline 9V battery, eight hours of continuous operation should be obtained. A rechargeable battery will last about two hours.

Never bend or twist the headband too sharply. There is a thin film connection between the sensors and the output wire. Bending or twisting the headband too sharply will damage the internal connections. The headband can last a decade at least if given proper care.

The electrodes that come with the IBVA are standard medical electrodes. For expert medical use, the electrodes should be replaced for each new session. When the IBVA is not being used for expert medical use, the electrodes eventually will become too worn to give a solid connection to the skin, resulting in inaccurate data.

2 Channel systems use almost duplicate transmitters and receivers, the difference being that they are tuned to different frequencies so the system can tell the difference between the two channels of data. 2CH systems can be used for reading the brainwaves of two people at the same time with two 1CH headbands, or the left and right brain hemispheres of an individual with the 2CH headband. "2 Channel mode" must be selected under the Edit menu within the IBVA program for the 2CH display to begin.

The transmitter and receiver must purchased as a each unit. ch1 and/or ch2 frequency.
electrodes, headbands, Pin Input Pak (3 pin adapter) etc. can be purchased as separately.

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