Summary of Contents for CED 1902
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Page 1: Application Guide
1902 application guide A guide to setting up CED 1902 amplifiers 03/9/2012 Cambridge Electronic Design Ltd. - Page 2 The 1902 is a single channel modular unit that can be combined into ‘stacks’ to give multiple amplifier channels. All settings for the 1902 are controlled directly from within Spike2 and Signal, or from a standalone amplifier control program if neither of the above are being used.
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Page 3: Table Of Contents
Contents Page What type of 1902 do I need? • 1902 options by application • How many channels? Connecting to the Isolated electrodes input • CED1902-11 Electrode adaptor boxes • CED1902-10 Active Head Stage • Wiring your own Isolated electrode input connection... -
Page 4: What Type Of 1902 Do I Need
#Input clamp is required if recording fast responses or from close to the site of stimulation ##ECG front end with 5 lead switching under software control The isolated input port of the 1902 will give the best results for most recordings due to its superior gain and low-noise. -
Page 5: How Many Channels
How many channels? Each 1902 is a single channel modular unit, but they can be combined into stacks to give multiple channels or supplied as dual or quad channel variants with optional rack-mounting. Multiple stacks, dual or quad channel units can then be ‘daisy-chained’... -
Page 6: Ced1902-10 Active Head Stage
If you are not using one of the CED1902-11 electrode adaptor boxes or the Active Head Stage, you can wire your own connectors using the supplied DIN plug included with the 1902. The Isolated electrode input is a 6-pin DIN socket which should be wired according to the pin descriptions in the... -
Page 7: Software Installation
This option is used to install software support for a signal conditioner along with Spike2 or Signal. Select CED 1902 signal conditioner and click Next. Information on setting up a 1902 amplifier for recording can be found in 1902 amplifier setup section. -
Page 8: Check For Available Com Ports
COM ports as described below, or select COM1 at this stage and then simply change the 1902 COM port in the Edit menu Preferences > Conditioner section in Spike2 or Signal later on. -
Page 9: Hardware Configuration
The diagram below shows the control line from the computer as either a direct serial port connection OR via a USB to serial converter. This connection is made to the back of the 1902 amplifier unit or to the bottom-most 1902 in a stack of multiple amplifiers. -
Page 10: 1902 Amplifier Setup
For instance you may already be using ADC Inputs 0-2 but want to connect a 1902, which is set to channel 0, to ADC Input 3. To do this you need to change the 1902 channel number to match the ADC Input using the rotary switch on the rear panel of each 1902 channel. -
Page 11: Control Of The 1902
Sample menu Conditioner option Signal The control panel for the 1902 is available from the Port setup tab of the sampling configuration in Signal. If you select an ADC port in the list, and there is a corresponding 1902 attached, the CED 1902 button is enabled. -
Page 12: The 1902 Control Panel
These specify the length of time to apply the input clamp in response to a pulse input on the Trigger 2 port of the 1902. If the clamp option is not fitted you should set the input to use Isolated EEG for recording from electrodes. -
Page 13: Setting Gain And Offset
Volts, millivolts or microvolts, depending on the gain you have selected in the 1902 control panel. Whenever the gain or offset is changed in the control panel,... -
Page 14: Filters
0.16Hz. This can be useful if your feature of interest is small compared to the large DC level. Unlike the High and Low pass filter settings, which are applied at the amplifier output, the AC couple is applied at the input. CED 03/09/12... -
Page 15: Triggering The Input Clamp
This can cause problems if the response is very fast or is being recorded from close to the site of stimulation. The diagram above shows a fast MEP response from the electrode (Fig. A) that is missed due to the amplifier saturation caused by the stimulus artefact (Fig. B). CED 03/09/12... - Page 16 Trigger 2 input using a T-piece. The same pulse can then trigger the 1902 clamp with the rising edge of the pulse and the stimulator with the falling edge, ensuring the necessary delay.
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Page 17: Standalone Control Of 1902
Once communication with the 1902 has been established, select Set port and channels… from the File menu in Try1902. This allows you to set global settings for COM port and the first and last 1902 channels for use by the Ctl1902 application. -
Page 18: Troubleshooting
0 as the first available channel on the 1902. If the first channel on your 1902 is not 0, you need to set the First 1902 channel to use option to match your first 1902 channel number. Try1902 will then search up to the channel number specified in the Last…...