Model A-1(B)

Head Stage Relays for Remote Selection of:
1. Record Mode
2. Stimulate Mode
3. Impedance Test

Internal 1 kHz Nanoamp Tester with Panal Meter (avalable with digital panel meter)

Continuous Gain Control: 100-10,000

Optional Rechargable Batteries

Optional Filtering
 
 
 
 
 
 

Description:

The Model A-1 amplifier was designed as a versatile preamplifier and impedance testing system for metal microelectrodes.  The Model A-1 comes with a small remote active probe so that the input amplification stage is as close to the electrode as possible in order to reduce input capacity and noise pickup.  The impedance of the electrode may be measured by simply turning the mode switch on the front panel to TEST and observing the impedance value on the meter.

Another feature of the Model A-1 is the capability of delievring an externally derived current or voltage signal to the electrode by positioning the mode switch to STIM with the external source plugged in the red mini-banana jack on the probe stage.  This eliminates having to manipulate the electrode lead wires.  Miniature reed relays in the head stage modify the input configuration for the three different modes of operation.

The Model A-1 is of modular construction and slides easily into the Model RP-1 rack mount power supply module case.

Specifications:

Amplifier

Gain . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  100-10,000 (continuous)
Bandwidth . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  100 Hz to 6 kHz (3 db/down)
Cutoff Slope . . . . . . . . . . . . . . . . . . . . . . . . . . . .  Low Frequency 30 db/octave, High Frequency 12 db/octave
Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . less than 10 microvolts peak-to-peak RTI
Input Impedance . . . . . . . . . . . . . . . . . . . . . . . . . 200 megohms single-ended
Input Coupling . . . . . . . . . . . . . . . . . . . . . . . . . .  AC
Input Dynamic Range . . . . . . . . . . . . . . . . . . . . . 100 minivolts
Signal Polarity . . . . . . . . . . . . . . . . . . . . . . . . . . Non-inverting
Input Capacitance . . . . . . . . . . . . . . . . . . . . . . .  Less than 20 picofarads
Output Impedance . . . . . . . . . . . . . . . . . . . . . . . 100 ohms

Impedance Tester

Sine Wave Frequency . . . . . . . . . . . . . . . . . . . . . 1 kHz
Testing Current . . . . . . . . . . . . . . . . . . . . . . . . . . Less than 30 nanoamps
Impedance Testing Range . . . . . . . . . . . . . . . . . . 10 K to 5 megohms
Accuracy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Less than 10% error

Power Requirements . . . . . . . . . . . . . . . . . . . . .  +/- 15 volts supplied by the Model RP-1 (+30 ma typ., +70 ma max) and (-25 ma)
SIze . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  4.8"w x 5.25"h x 7.25"d
Probe Size . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1.4"w x 1.13"h x 2.25"d
Weights . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .  1.5 lbs

Options:

Model A-1B Rechargable Batteries

The Model A-1B contains rechargable Nicad batteries and can be used as a stand alone unit or it may be powered by the Model RP-1.  A front panel switch selects the power mode.  A LED lamp will light when the batteries require recharging.  The Model A-1B will operate for approximately 10 hours off a full charge which takes a minimum of 16 hours.  The Model RP-1 has been designed for recharging batteries.

Option (1) - Price Class D - Filters

Specify either A-1(1) or A-1(B) when ordering and include in description two frequencies each for high and low cut-off values.  Two toggle switches will be installed for selecting the filters, which are single pole (6db/octave) and are in addition to the normal roll-off filtering of the unit (100 Hz to 6 kHz).

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