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Model
15A54 and 15A94
The Model 15A54 and 15A94 Quad Neuroamplifiers, in the long line
of high performance amplifiers from Grass are designed specifically
for neurophysiological measurements. The 15A54 has extended high
frequency response to 6 kHz. The 15A94 has high frequency response
to 100 Hz, suitable for clinical applications in EEG and PSG.
Superb
Specifications in Compact Unit
While maintaining all of the characteristics of the amplifiers that
have made Grass famous for signal quality, we have packaged four
amplifiers into a single plug-in module, added true 250 volt subject
isolation, and four-pole active low pass Bessel filters for outstanding
filtering performance and minimum phase distortion.
Grass-Quality
High Performance Electronics
Gain is independently adjustable to a maximum of 200,000 and band-pass
filtering from 0.01 Hz to 6 kHz (15A54) allow these amplifiers to
be used directly for all AC bioelectric potentials as well as with
many transducers.
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|
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Model 15A54
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Model 15A94
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|
| Amplification |
| Amplification |
|
50
minimum to 200,000 maximum |
| Amplification
Settings |
|
5,
10, 20, 50, 100 and 200; x10 and x1000, ±2% accuracy |
| Filters |
Low
Cutoff Frequencies
(-6 dB) |
|
15A54:
0.01, 0.1, 0.3, 1, 3, 10, 30 and 100 Hz
15A94: 0.01, 0.1, 0.3, 1, 3, 10, 30 and 100 Hz |
High
Cutoff Frequencies
(-6 dB) |
|
15A54:
0.03, 0.1, 0.3, 1 and 6 kHz
15A94: 0.5, 3, 10, 30, 60 and 100 Hz |
| Line
Filter |
|
Notch-type
filter (50/60 Hz) jumper selectable |
| Input
Characteristics |
|
Input Type |
|
Isolated |
| Input
Impedance |
|
20
Megohm, differential, 35 pF at connector per terminal |
| CMR
(Common Mode Rejection) |
|
30,000:1
(90 dB) at 60 Hz |
| Noise |
|
15A54
& 15A94:
3 µV peak to peak, referred to input, inputs shorted, 100 Hz bandwidth
15A54:
10 µV peak to peak, referred to input, inputs shorted, 6 kHz bandwidth
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| Output |
| Type |
|
Single-ended,
clipped at approximately 10 volts peak to peak |
| Output
Impedance |
|
300
ohms |
| Output
DC Level |
|
² 20 mV adjustable |
| Connector |
|
37-pin
DSUB |
| Trace
Restorer |
|
Pushbutton
control to return output to 0 volts |
| Physical
Specifications |
| Dimensions |
|
8.625"
W x 9" D x 0.875" H
(22 cm x 22.9 cm x 2.3 cm) |
| Weight |
|
1
lb. 2 oz. (0.57 kg) |
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