Blackrock Microsystems CerePlex m Manuel utilisateur

Manufacturer

630 Komas Drive | Suite 200

Salt Lake City | UT 84108 | USA

P +1 (801) 582-5533 | F +1 (801) 582-1509

www.blackrockmicro.com

Revision 5.00 / LB-0729 – CerePlex µ IFU – 2020/08

CerePlex µ

Instructions for Use

Revision 5.00 / LB-0729 – CerePlex µ IFU

Table of Contents

Warnings and Precautions .................................................... 3

Warnings ........................................................................................ 3

Precautions ..................................................................................... 3

Specifications ........................................................................ 4

What This Manual Covers ..................................................... 6

Hardware ............................................................................... 7

Blackrock CerePlex µ 32 Headstage Pin-out .................................. 7

Blackrock CerePlex µ 16 Headstage Pin-out .................................. 7

CerePlex µ Headstage LED ............................................................ 8

CerePlex µ Headstage Motion Sensing .......................................... 8

CerePlex µ Headstage Adaptor ...................................................... 9

Motion Sense Switch .................................................................. 10

LED Switch ................................................................................ 10

Impedance Switch ...................................................................... 10

CerePlex µ Headstage Cabling .................................................. 10

Instructions for Assembly .................................................... 11

Cleaning, Maintenance, and Disposal................................. 11

Cleaning ....................................................................................... 11

Maintenance ................................................................................. 11

Disposal ........................................................................................ 11

Magnetic Resonance .......................................................... 11

Troubleshooting .................................................................. 12

Warranty .............................................................................. 13

Return Merchandise Authorization (RMA) .......................... 13

Support ................................................................................ 14

Complaints .................................................................................... 14

Revision 5.00 / LB-0729 – CerePlex µ IFU

Warnings and Precautions

Warnings

 Do not touch any exposed electrical conductors when the CerePlex µ

connector is attached to devices on subject’s head as this may result in

inducing electric charge to the neural tissue. Irreversible damage may

occur.

 Do not use the CerePlex µ in the presence of flammable anesthetic

agents or any other reagents.

 Avoid strong static discharges from sources like television or computer

monitors because they can damage the electrical components of the

system.

 Keep the CerePlex µ away from liquids. Contact with water, shower

spray, or wet surfaces can lead to the subject receiving an electrical

shock.

 Connection of external instruments to the CerePlex µ may compromise

electrical safety.

 Always use antistatic or electrostatic discharge (ESD) safe gloves when

connecting the CerePlex µ.

 Use only the supplied Blackrock Microsystems components (Cerebus™

system & Digital Hub128 or CerePlex Direct, CerePlex µ Cable).

Substitution of components not supplied by Blackrock Microsystems may

affect system performance and subject safety.

 Use caution when placing cables and other connectors to minimize the

likelihood of tripping or accidentally pulling on cables. Pulled cables may

cause damage to the CerePlex µ or any other connected devices.

Precautions

 Read this entire manual prior to using the device.

Revision 5.00 / LB-0729 – CerePlex µ IFU

Specifications

Model Name

Blackrock CerePlex µ

Channel PN

9714

Power Requirements

+5 VDC, 70 mA maximum load

Resolution

16-bit ADC. 250 nV/bit

Sampling Frequency

30 kHz

Mode of Operation

Continuous

Input Frequency Range

0.3 Hz – 7.5 kHz

Input Impedance Range

1300 MΩ @ 10 Hz, 13 MΩ @ 1 kHz

Maximum Input Voltage

± 8.169 mV with respect to reference

Ingress Protection

Ordinary Equipment, not fluid resistant, IP20

Operating Environment

10˚C to 40˚C, 5 to 95% R.H. (non-condensing)

Storage Environment

-20˚C to 50˚C, 5 to 100% R.H. (non-condensing)

Input

Connector

36-pin Omnetics part number A79023-001

Headstage Weight (without cable)

1.2g

Headstage Dimension

13 mm x 20 mm

Revision 5.00 / LB-0729 – CerePlex µ IFU

Model Name

Blackrock CerePlex µ 16

Channel PN

9162

Power Requirements

+5 VDC, 70 mA maximum load

Resolution

16-bit ADC. 250 nV/bit

Sampling Frequency

30 kHz

Mode of Operation

Continuous

Input Frequency Range

0.3 Hz – 7.5 kHz

put Impedance Range

1300 MΩ @ 10 Hz, 13 MΩ @ 1 kHz

Maximum Input Voltage

± 8.169 mV with respect to reference

Ingress Protection

Ordinary Equipment, not fluid resistant, IP20

Operating Environment

10˚C to 40˚C, 5 to 95% R.H. (non-condensing)

Storage Environment

-20˚C to 50˚C, 5 to 100% R.H. (non-condensing)

Input Connector

18-pin Omnetics part number A79015-001

Headstage Weight (without cable)

Headstage Dimensions

13 mm x 20 mm

Revision 5.00 / LB-0729 – CerePlex µ IFU

What This Manual Covers

The Blackrock CerePlex µ provides an interface between the Cerebus recording system

or the CerePlex Direct recording system for high fidelity transmission and recording of

extracellular spikes and local field potentials from the brain. The Blackrock CerePlex µ

converts analog signals to digital format right at the recording site which dramatically

reduces the noise introduced to the signal during transmission. Moreover, the motion

sensor on the CerePlex µ provides 3-axis accelerometer and 3-axis gyroscope at the

headstage.

Revision 5.00 / LB-0729 – CerePlex µ IFU

Hardware

Blackrock CerePlex µ 32 Headstage Pin-out

Blackrock CerePlex µ 16 Headstage Pin-out

Figure 3-1–Top, CerePlex µ Input Connector Pin-Out. Be sure to note the side of the

headstage that has the Omnetics date code to ensure the correct orientation.

Revision 5.00 / LB-0729 – CerePlex µ IFU

CerePlex µ Headstage LED

Two infrared LEDs on the headstage can be used for video tracking using

Blackrock’s Neuromotive video tracking system. The LEDs can be turned on or

off via the CerePlex µ Headstage Adaptor (see below).

CerePlex µ Headstage Motion Sensing

The motion sensing can be turned on and off via the HDMI adaptor. The

CerePlex µ 32-Channel will occupy two 32-channel banks in Central when the

Motion Sense Switch is ON; however, only the first 7 channels of the second

bank will be occupied. For instance, if CerePlex µ is recording neural signal data

on channels 1 to 32, channels 33-37 will contain the motion data when the When

the Motion Sense Switch is OFF, the CerePlex µ 32-Channel will only occupy

one 32-channel bank. The CerePlex µ 16-Channel will always occupy one 32-

channel bank in Central regardless of the position of the Motion Sense Switch.

Refer to the table in Figure 3-3 for the motion data channel mapping and the axis

orientations of each sensor.

The table in Figure 3-3 shows the full-scale range for the motion sensors to allow

conversion to the appropriate units. As with the neural data, motion data is saved

to a file as 16-bit signed integers. When reading the file, multiply the

accelerometer channels by 1.22 x 10-4 to convert the 16-bit integers to g, and

the gyroscope channels by 0.0305 to convert the 16-bit integers to °/s.

Figure 3

–

CereP

lex µ LED location

Figure 3-3–Motion sensor axis orientations, channel mapping, and conversion

factors

Revision 5.00 / LB-0729 – CerePlex µ IFU

Sensor Axis

Channels in Central

µ 32

Channels in Central

µ 16

Full

scale Range

Accelerometer X

± 4 g

Accelerometer Y

± 4 g

Accelerometer Z

± 4 g

Gyroscope X

± 1000 °/s

Gyroscope Y

± 1000 °/s

Gyroscope Z

± 1000 °/s

CerePlex µ Headstage Adaptor

The CerePlex µ headstage adaptor provides a simple and easy way to control

the headstage. The three switches on the adaptor allow the user to control the

LED on/off, motion sensing on/off, and impedance on/off. See Figure 3-4 for

switch locations.

Figure 3-4–CerePlex µ Adaptor Switch Setup. | = ON position; O = OFF position.

Revision 5.00 / LB-0729 – CerePlex µ IFU

Motion Sense Switch

The switch is located at the side of the adaptor and sends motion data

when the switch is in the ON position

LED Switch

The two IR LEDs on the headstage will illuminate when this switch is in

the ON position.

Impedance Switch

To select impedance mode, toggle the switch to the ON position. The

CerePlex µ headstage should not be in Impedance mode while

attempting to record neural signals. In Impedance mode, the CerePlex µ

delivers to each electrode sequentially a 1 kHz, 1 nA peak-to-peak

current for 100 ms. The CerePlex µ impedance measurements are

accurate for electrodes between 10 kOhm and 2 MOhm.

In order to measure electrode impedances with the CerePlex µ the

Central software must be configured to measure impedances using

CerePlex Family headstages. This is only required once, unless the

setting is subsequently changed. In the Central software, click on the

TOOLS drop down box then select OPTIONS. Under Auto Impedance

Interface, select “CerePlex Family”. Click OK. Next, click on the

IMPEDANCE TESTER button. Populate the dialog box that appears on

the screen if desired. Impedance values should be displayed on the

screen. To exit impedance mode, close the Impedance Tester window,

toggle the switch to OFF.

CerePlex µ Headstage Cabling

Cables are available in 1.5 ft and 2.5 ft lengths. Multiple cables can be

daisy chained to create longer cable lengths. Note that, both connectors

on the cable are keyed. Align the connectors before making connections

to avoid damage to the pins.

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