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npi electronic PEXT
PEXT - Extracellular Amplifier and Drug Ejection is designed for pressure ejection of drugs in physiological and pharmacological studies while recording extracellular signals.
It combines the popular PDES pressure ejectors with the extracellular amplifier EXT-02F/1 in one 19" instrument that can easily be mounted in a rack.
Pressure ejection of substances can be performed with the same pipette as extracellular recording at the same position, or at a distant site using a separate pipette
2 or 4 bar pneumatic output
Digital manometer with pressure monitor
Digital timer (100 is to 9999.9 ms) for pressure ejection
Manual, internal timed or external (TTL) pneumatic operation
Differential amplifier input with high impedance
Input with BNC connectors or small headstage
Offset control potentiometer with two ranges (±0.1V or ±1V)
Lowpass filter: 30, 100, 300, 500, 700, 900, 1.3k, 1.5k, 1.7k, 3k, 10k, 20k Hz
Highpass filter: OFF, 3, 30, 100, 300, 400, 500, 600, 800, 1k, 3k, 10k Hz
Output: DC or AC filtered x10 to x10k
Optional audio monitor, noise mode with threshold or pitch mode
Over LEDs (activating at 10% below maximum output)
Analog balance monitor for optimal offset control
Two separate holders for ejection and recording or one combined ejection/recording pipette holder
| Mode selection | Three position toggle switch, (Timer, Cont., Ext.) |
|---|---|
| Source gas | Air, nitrogen, helium etc. No aggressive, combustible or explosive gases, filtered by a 5 µm filter element |
| Pressure range | Input pressure: max. 5 bar (1 bar = 105 pa = 14.5 psi), pressure control range: 0-4 bar, 0-58 psi; with microject 0-2 bar, 0-30 psi, display range: 0-4 bar, 0-58 psi, residual air pressure: 10 mbar (0.145 psi) - 100 mbar (1.45 psi) |
| Input and output couplings | Quick connect type |
| Digital timer | 100 µs - 9.9 s set by five digit tumble-wheel switch (0000.1 - 9999.9 ms) |
| Analog timer | 0.1 - 1 s and 1 - 10 s with linear control, range set by toggle switch time base selector (0.1 s, 1 s) |
| Minimum pressure pulse length | 10 ms (digital timer), <1 ms with microject, 100 ms (analog timer) |
| Pulse output | Pressure Monitor: standard BNC connector, sensitivity: 1 V / bar or 0.1 V / psi, output impedance 249 Ω, timing Monitor: standard BNC connector, TTL (LO = 0-1 V, HI = 5 V), output impedance 249 Ω |
| Pulse input | Standard BNC connector, TTL (LO = 0-2.5 V, HI = 2.5-12 V), input impedance 10 kΩ |
| Status/eject time indicator | Red/green LED, red light: channel has been turned on, valve is closed, green light: valve is open |
| Power requirements | 115/230 V AC, 20-40 W |
| Dimensions | 19" rackmount cabinet, 19" (483 mm), 10" (250 mm), 3.5" (88 mm) |
| Remote control (option) | Toggle switch and status LED for each channel |
| Size: 25 x 40 x 100 mm |