configure BioExplorer for the X-wiz
This is an introductory description. The full description of Wiz devices can be found under the Manuals tab.
The X-wiz is a 2 channel device supporting HEG Modalities:
- Toomim nIR HEG (supports 2ch operations, although only 1ch headbands are currently available)
- Carmen pIR HEG system
- pulse oximeters
It supports automatic calibration (“baselining”) of HEG signals.
The X-wiz is principally a USB-direct connect device, but can also connect wirelessly. It targets tablet solutions but can work equally well with PCs. The X-wiz does not have any buttons – functions on the X-wiz are controlled by the Application, whether that application be BioExplorer, BioEra, or EEGer. Setup of the X-wiz occurs under direct-USB connection and not in wireless connection. Once the Wiz is configured as required under direct-USB connection, the Wiz will remember the settings and carry that into wireless operations.
“Mode” refers to the characteristics of the channels used to transport the bio-signals from the Wiz to the Application. Mode defines the sampling rate and the number of channels. “Modality”, on the other hand, refers to the different types of bio- signals supported, such as pIR, nIR, and oximetry. Different modalities place different demands on the channel supporting them, thus for example, HEG can be supported on a low sampling rate channel and EMG demands a high sampling rate channel. The Wiz provides different Modes to optimally support different Modalities on up to four slots available for sending bio-signals to the Application.
Since the Wiz remembers certain parameters including Mode, in the most common usage scenario of single channel & single modality, operation reduces to
- plugging in the headband,
- turn on the Wiz, and
- hit the play button on the Application.
The Wiz will auto-baseline to a value of 100. The objective of training is to increase this baseline value.
The Modes available are listed below. The Mode light on the Wiz will blink once for Mode 1, etc.
<Mode 0> program mode – used to upload new firmware or interrogate firmware version number
<Mode 1> 2ch x 32sps – recommended for HEG with low-end tablets
<Mode 2> 2ch x 128sps – recommended for HEG generally
<Mode 3> 2ch x 512sps – grants higher bandwidth (and more noise) to the HEG signal
<Mode 4a> 4ch x 256sps – ch 3 & 4 used to transport the components of the Ch1 nIR HEG ratio value : the infrared component (Ch3) and the red component (ch4)
|configuration||Slot 1||Slot 2||Slot 3||Slot 4||Comment
|nIR & pIR sensed||NIR1||PIR1||
|pIR sensed||PIR1||Test Tone||
|pulse sensed||PULS1||Test Tone||
|pIR & pulse sensed||PULS1||PIR1||
|headband sensed||HEG1||HEG2||IR1||RED1||HEG (nIR or pulse) components (infrared, red) extracted
The lights on the Wiz can be used to confirm that commands sent from the Application have been received:
|On steady||sending to Application via USB
|On blink||sending wirelessly
|Off blink||not transmitting to Application (ie Program Mode)
|4 blinks||acknowledging command received for Application
|No of blinks||wireless channel number
|On||nIR full signal strength, and/or pIR valid reading
|Off||nIR not full strength, or pIR reading out of range
|No of blinks||Mode 0/1/2/3/4 = Program/32sps(2ch)/128sps(2ch)/512sps(2ch)/256sps(4ch)
|On||when nIR, pIR or Oxi headband sensed
|Off||no headband sensed, all 2/4 channels used for EEG
|Blink||when nIR/pIR/pulse baseline search for nominal value of 100 is under way
The Wiz Window in BioExplorer has the following functions for commanding the Wiz:
- Power – turn Wiz on & off
- EEG Link References – not applicable, ignored
- EEG Freeze Offset – not applicable, ignored
- HEG Calibrate – initiate search for the HEG nominal value of 100
- Program – Mode 0: set this mode to update firmware or interrogate version number
- HEG – Mode 1: set this mode for HEG signals to minimise the load on the PC processor – low end tablets
- EEG – Mode 2: set this mode for HEG general use
- ExG – Mode 3: set this mode for extra bandwidth (and noise) of the HEG signal
- EEG+Impedance – Mode 4a: 2ch HEG and continuous electrode impedance measurement in ch 3 & 4
- EEG+Offset – Mode 4b: not applicable, ignored
- 4Ch – Mode 4: not applicable, ignored
- Helper functions used occasionally
- Off – revert back to normal mode
- Electrode Impedance Check – not applicable, ignored
- Electrode Offset Check – not applicable, ignored
- Electrode-sense Off – not applicable, ignored
- Test Tone – inject a test sequence of alternating HEG values of 99.5 and 100.5, alternating at 1 second intervals
- Buzzer (not applicable)
- USB Only – turn off wireless
- 1…8 – turn on simultaneous USB and wireless, the latter allows monitoring of the eeg by a monitoring station
Checking the validity of bio-signals
There are a few things in the Wiz to enable you to check the health of the HEG system.
The Helper Test Tone function puts out a test tone of approximately 99.5 and 100.5, alternating every second. This checks most of the HEG circuitry.
In relation nIR HEG, the Helper Test also tests the signal sent to the nIR headband. In normal use, the Red and Infrared lights on the headband are switched rapidly making it impossible to see whether the infrared light (being largely outside the visible spectrum, and so very dim) is lighting or not. With the Test Helper, the signals sent to the headband are a slow flash of the Red and Infrared light so that it becomes possible to perceive that the infrared light is illuminating. If either light is not working, then a return-to-factory repair is required.