Med Associates Inc: ICSS Stimulators

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ICSS Stimulators
Programmable Stimulators	Stimulator Accessories
Programmable Stimulators with Monitor Output

PHM-150B
Programmable ICSS Stimulator

PHM-150B/2
Dual Programmable ICSS Stimulator

The PHM-150B and PHM-150B/2 stimulators are the same except that the PHM-150B/2 is made up of two PHM-150B modules housed in the same cabinet with independent power supplies. Each stimulator is a single dual site square wave stimulator designed for intracranial self stimulation (ICSS) in a behavioral test package. Up to 16 stimulators (eight model PHM-150B/2 units) may be connected to a single DIG-729 PCI controller (sold separately). This is a constant current square wave stimulator. The maximum current possible is related to the impedance of the electrode. Programmable stimulator parameters include pulse #1 amplitude and duration, pulse delay duration, pulse #2 amplitude and duration, frequency, and train duration.

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PHM-152
Programmable ICSS Stimulator w/ Monitor Output

PHM-152/2
Dual Programmable ICSS Stimulator w/ Monitor Output

These units are identical to the PHM-150B and PHM-150B/2 with one additional feature. On the front of each stimulator is a BNC connector that provides an optically isolated output. Two output sensitivities are provided, 20 µA/V or 100 µA/V. This output may be connected to a conventional or storage oscilloscope or analog to digital converter to validate programmed settings as well as monitor actual subject stimulation. These units also require the DIG-729 PCI controller and cables (sold separately). Contact Sales for more information.

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Stimulator Accessories

PHM-155A
Output Cable, 5' (1.5 m)

PHM-155B
Output Cable, 10' (3.0 m)

PHM-155D
Output Cable, 2' (.6 m)

These cables feature noise free RG-58 coaxial cable with male BNC connectors on each end. They may be used to connect the stimulator sites to the PHM-155C cable or to connect the isolated monitor output to an oscilloscope input.

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PHM-155C
BNC Adapter

This BNC to female banana plug socket adapter is used to connect electrode leads with male banana plugs to the PHM-155A or PHM-155B cable.

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PHY-015-2 2 Channel Commutator
PHY-015-4 4 Channel Commutator
PHY-015-6 6 Channel Commutator
Commutators, also known as electric swivels or slip rings, are available with 2, 4, and 6 channels. All commutators have an opening through the center to allow tubing from a leash assembly (PHM-120C) to pass through. They are designed to be low current and low voltage devices. These have been tested to levels of 100 V and 0.08 A. All single plug commutators are supplied with a live plug (red) and a dummy plug (white) for even rotation of the rotor. Commutators are low noise and environmentally safe. The mechanism for conducting electrical signals consists of brushes and rings. All commutators have double brushes to assure unbroken continuity, unless a single brush is requested to reduce torque for use with mice. Note, if a single brush version is needed for use with mice, add "SB" to the part number.
Commutator Specifications:
Electrical (all models): Resistive Load: < 150 ohms/channel Contact Resistance: < 10 ohms Insulation Resistance: > 2000 ohms Through-Signal Distortion: 0.02% ± 0.01% Insertion Loss: -47 dBm @ 500KHz Parallel Channel Cross Talk: -68 dB induced	Test Method Total static load from input to output Dynamic test brush to ring Electrical isolation between parallel channels 1mV ref into 500 ohms -16 dBm ref into 50 ohms 5 KHz signal, 5 Vp-p, into 50 ohms	Mechanical Break Away Torque (BAT) Weight 2 channel: 0.35 in oz. 1.75 oz (50 grams) 6 channel: 1.06 in oz. 1.80 oz (52 grams) Note: Running torque is approximately 80% of BAT.
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PHM-110P1
Arm Assembly

Similar to the PHM-110 except it has been modified for use with the PHY-015 line of commutators. The arm assembly includes an aluminum block for mounting on most test chambers. Med Associates' chambers with the "CT" extension in the model number (e.g. ENV-008-CT) are pre-drilled for this block or a modular panel is available for most chambers. The adjustable post extends up to 8.0" (20.3 cm) above and 7.0" (17.8 cm) over the center of the chamber with a pivot arm and dual action gimbals. An adjustable counter balance weight maintains sufficient tension to keep the leash assembly away from the test animal.

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Site Updated: July 1, 2008