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Neurologger 2/2A
Neurologger 2 is the second version of the Neurologger. Its weight, size and power consumption are approximately 10 times smaller than in the first version. This allows placing the datalogger directly at the head of an animal, even at such small like a mouse. At the same time the computational power of the datalogger is doubled: now it can store 38.4 kilo samples per second (4ch x 9.6 ksps). This allows to store all four channels of tetrode that is very popular in neuronal activity recording.
The minimal weight of the recording combination is 1.285 g only! (It includes: 128MB neurologger board - 0.890 g, two ZA5 35 mAh batteries - 0.345 g, batteries connecting wires - 0.050 g. Not included: head connector, protective cover.)
Neurologger 2A is the improved version of Neurologger 2. Differences between two devices are described below.
Neurologger 2 has been used in the following studies:
Vyssotski et al., 2009
Rattenborg et al., 2008
Pang et al., 2009
Brankack et al., 2010
Neurologger 2A has been used in the recent research:
Scheffzük et al., 2011
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Technical data of the Neurologger 2
Number of channels: |
4 with 2 ref. inputs
(ch1 and ch2 to ref1; ch3 and ch4 to ref2) |
ADC resolution: |
10 bit |
Input range: |
+/- 500 µV |
Neurologger mechanical dimensions (without batteries): |
22x15x3 mm 3 |
Total mechanical dimensions (Neurologger, batteries): |
22x15x5 mm 3 |
Weight of 256MB neurologger board: |
0.945 g |
| Weight of two 80mAh Renata ZA10 batteries: |
0.635 g |
| Weight of head connector: |
0.255 g |
Weight of protective cover: |
0.170 g |
Weight of battery connecting wires: |
0.050 g |
Total weight: |
2.055 g |
Battery life time: |
EEG logger, 4 channels, 100, 200 or 400sps |
1 day 9 h |
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Single unit logger, 4ch x 9.6ksps |
23 h |
256MB memory data filling time: |
4 channels, 100sps |
5 days 4 h |
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4 channels, 200sps |
2 days 14 h |
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4 channels, 400sps |
1 day 7 h |
| 4 channels, 9.6ksps |
1 h 17 min |
256MB data downloading time: |
26 min |
Interface: |
3 SPI, 2.2Mbps, converted to USB via custom adapter, power supply, one CMOS digital input for events recording (shared with SPI pin)
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Data format: |
Custom |
Neurologger 2A versus Neurologger 2
"Neurologger 2A" has the same size and weight as "Neurologger 2", but it encapsulates a set of improvements. The most significant are:
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Memory size is increased from 256 MB to 512 MB, or 1GB in version “Neurologger 2A-1GB”.
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Downloading speed in increased 1.8 times. Now the downloading baud rate is 4Mbps against 2.2Mbps before.
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Sampling rate can be freely chosen between 0.6 Hz and 19.2 kHz against set of fixed frequencies. The maximal sampling rate is doubled and the logger can record all four channels at 19.2 kHz.
- Oversampling 1x, 2x, 4x or 8x can be freely chosen to increase accuracy of analog-digital conversion. In Neurolpogger 2 oversampling was fixed: 8x for 100 Hz mode and 4x for 200 Hz and 400 Hz modes. However, the primary sampling rate can't exceed the maximal rate 19.2 kHz.
Additionally, the accelerometer add-on micro-board to record 3-D acceleration (or its absolute value) has been developed. Having weight of 0.442 g only, it also incorporates the infrared receiver to get the synchronizing signal from the external equipment sent through “Neurologger Synchronizer”.
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