Dual Microiontophoresis Window Current Generator Discriminator l Monitor signals and discriminator levels simultaneously at the multiplex output l Window height independent of lower discriminator level setting l Logic level output pulses, TTL compatible l Output pulses indicated by LED display The Dual microiontophoresis Current Generator (model 260) is an electrically isolated, battery-operated instrument designed for the electroiontophoresis of dyes, drugs and charged substances from micropipettes. Two identical battery operated current generators are available. In ordinary use, the two current generators are operated in parallel providing two distinct currents; one for preventing substances in the micropipette from outward diffusion (the retain or hold current) and the second for actively ejecting charged material. For pipettes with submicron tips, a hold current may not be necessary if there is little outward diffusion of pipette material. model 260 is powered by two 9-volt alkaline batteries per side (four, in total); unique circuitry converts the ±9 V to ±100 V without a transformer, yielding an exceedingly quiet output. SYS-260 Dual microiontophoresis Current Generator optional aCCESSoriES 2933 rack mount Kit, 51⁄4-in. high SYS-121 2932 2851 500184 500257 500258 500259 Window Discriminator rack mount Kit, 3.5-in. High BNC-to-BNC cable, 5’2” BNC-to-BNC cable, 10 ft BNC-to-BNC cable, 6 inch 15 cm BNC-to-BNC cable, 12 inch 30 cm BNC-to-BNC cable, 18 inch 46 cm AMPLIFIERS, ELECTROMETERS Audible Baseline Monitor The ABm, a battery-operated voltage-controlled oscillator, lets you monitor potential audibly. ABm is particularly useful because it allows the user to estimate voltage levels when using a microscope or engaged in other tasks which do not allow viewing an oscilloscope or recorder. An audible tone is generated with increasing pitch as the input voltage becomes increasingly positive. SYS-aBM Audible Baseline monitor Ωmega-Tip-Z ™ Millivolt and megohm meter measures impedance of metal or glass capillary microelectrodes Omega-Tip-Z was created especially for measuring impedance in etched tungsten, platinum-iridium* and steel microelectrodes, as well as electrolyte-filled micropipettes. The meter’s AC impedance-measuring circuit is unaffected by electrode offset or tip junction potentials. The gold-plated miniature probe lets you conveniently monitor micro-electrode impedance in electrolytes, and an electrode tip cleaning feature lets you remove buildup quickly. Omega-Tip-z can also measure DC electrode tip potentials up to 2000 millivolts. The instrument operates for hundreds of hours without battery failure. notE: metal microelectrodes which have been precalibrated at 1 kHz should be baselined for use with Omega-Tip-z. *See Metal Microelectrodes, page 88. SYS-oMEGaZ 711p 5468 Omega-Tip-z with probe & Holder replacement probe Adapter to connect metal microelectrodes to probe, 2 mm socket to .031 in. receptacle low-pass Filter upper frequency band limit can be smoothly varied between 100 Hz and 30-kHz using a single knob. WpI’s new low-pass filter is small, consumes little power, and can be located almost anywhere in your workspace. Features switch-selectable gain of ×1 or ×10 and low noise. An ideal tool for filtering an analog signal before digital conversion by data acquisition systems. SYS-lpF30 Lo-pass Filter optional aCCESSoriES Z-litE Fiber Optic Illuminator (115v, 60Hz, beige case) Z-litE-Z Fiber Optic Illuminator (230v, 80Hz, black case) 500186 Bifurcated Light Guide with lenses Z-litE-186 z-Lite Illuminator and bifurcated light guide US: Tel: 941-371-1003 • sales@wpiinc.com World Precision Instruments UK: Tel: +44 (0)1462 424700 • wpiuk@wpi-europe.com www.wpiinc.com Germany: Tel: +49 (0)30-6188845 • wpide@wpi-europe.com 81