AC DIFFERENTIAL AMPLIFIERS
Description:
The Model MDA- 1 was designed for relatively low impedance differential
recordings using metal microelectrodes. It is primarily intended for muscle
and nerve studies where low noise and very high common mode rejection are
necessary. This amplifier has both low and high frequency seven position
cut-off switches. The unique feature of the Model MDA-1 is the ability
to pass externally derived stimulus pulses through the recording electrodes
via two front panel banana jacks. A three position switch selects the three
modes of operation which are record, stimulate and gate-on stimulus. The
later mode allows the investigator to program in the stimulus via the Model
MDA-1 internal reed switches and gate-pulse input connector. The Model
MDA-1 will remain in the stimulus mode as long as the gate pulse remains
high and will return to the recording mode when it goes low. The Model
MDA-l has a gain of 10 to 1,000 with continuous resolution and low output
impedance for driving several signal processing and analog recording devices.
The Model MDA-l is of modular construction and slides easily into the Model
RP-1 rack mount power supply module cage system.
The Model MDA-2 is identical to the MDA-2 but does not include the stimulus
delivery system.
Specifications:
Input Impedance . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . 10 megohms
Output Impedance . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . .100 ohms
Output Dynamic Range . . . . . . . . . . . . . . . . . . . . . . .
. . . . . 25 volts peak to peak
Input Coupling . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . AC
Input Time Constant . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . 0.5 sec
High Cut-Off Ranges (3 db) . . . . . . . . . . . . . . . . . . . .
. . . . . 0.1,0.2,0.5, 1,2,5 and 10kHz
Low Cut-Off Ranges (3 db) . . . . . . . . . . . . . . . . . . . . .
. . . . 1, 2, 10, 50, 100, 200 and 500Hz
Common Mode Rejection . . . . . . . . . . . . . . . . . . . . . . .
. . . 90 db @ 60 Hz 44, 80 db @ 1 kHz
Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . 10 to 1,000 (X1-X1O continuous one turn)
Noise less than . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . 12 uV p-p (wide band)
Stimulus Gate Pulse . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . 4 volts min. (5 msec pulse width min.)
Power Requirements . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . +15 volts @ 120 ma
Size . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . 2.8"w x 5.25"h x 7.25"d
Other BAK epuipment often used with MDA-l,2:
| DDIS1 Dual Window Discriminator |
PSI-1 Pulsed Sample/Hold Integrator |
| DIS-1 Window Discriminator |
PF-1 Paynter Filter |
| AD-3,6 Analog Delay |
ABI-1 AC Bridge Integrator |
| ISI-1 Interspike Interval Convertor |
BPG-1,2 Biphasic Pulse Generator |
| RG-1 Raster Stepper |
BSI-l Biphasic Stimulus Isolator |
Other BAK electronic amulifiers suitable for different requirements:
| High Impedance Differential (microelectrodes): |
MDA-3, MDA-4 |
| Built In Electrode Impedance Testing: |
A-1, A-1B |
| Batter Powered: |
A-1B |
| True DC Amplification: |
DCDA-1, A-2 Intracellular |
| Low-Cost Single Ended: |
MMRS-1S |
| Multi-Channel Probe: |
MMRS-1P (25 single ended hybrid F.E.T. 's) |
Our other Amplifiers
Metal Microelectrode Preamplifier and Impedance
Tester, AC Differential Amplifiers, AC Differential
Amplifiers with Remote Probe, AC Differential Amplifier
with remote Probe and Impediance Test, D.C. Differential
Amplifier with remote Probe, Micropipette Electrode
Intracellular Probe System, Custom Designed Miniature
Multichannel Recording System, Specification And
Design Work Sheet: Model MMRS-1
Contact us at: P.O. Box 1600, Germantown, MD 20875
Phone: (301)540-3700 or (800)894-6000
Fax: (301)601-9018
E-mail: bakinc@erols.com
BAK ELECTRONICS, INC.
Biomedical Instrumentation
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