Products

MODEL 425/426 FIBER-OPTICALLY COUPLED ISOLATION AMPLIFIER

Description

The Model 425 / Model 426 system is a fiber-optically linked isolation amplifier. Due to the physical separation (20 foot cable is standard) of the two halves of the amplifier, much higher voltage isolation is available compared to transformer-coupled or traditionally optocoupled designs. The high-side amplifier module operates from a standard 9 volt battery, eliminating the other isolated connection in standard amplifiers. The high-side unit is available in either DIN-rail mounted packaging or steel box; the ground-side unit is available in either 19" rack-mount or wall-mount box enclosures.

High Side (425) Specifications

Input: Voltage signal, 0.25Vp-p max to 2.5Vp-p max in two or four switch-selectable ranges; others by request

Gain: +1.00 overall, from M425 input to M426 output; also available with variable overall gains

Resolution: Signal is digitized to 12 bits, or 1 part in 4096

Sample Rate: Input signal is sampled at 40kHz, controlled from ground side unit

Filtering: Before digitizing, signal is lowpass filtered at 15kHz

Power Saver: Amplifier powers down when fiber is disconnected, or by remote control from ground-side unit

Power Switch: Front panel switch disconnects internal battery or external power source

Battery Compartment: Self-contained holder for standard 9V battery; no tools required to change battery

Battery Life: Typically 25-30 hours continuous operation with alkaline battery; longer if power saver mode is used

Fiber Optics: Hewlett-Packard 1mm plastic fiber pair, 20 foot length standard

Connections:
FL425 Twelve wireclamp screw terminals accept wire sizes from 24-14 gauge
Model 425 Three-position terminal block accepts standard crimp lug

Mechanical:
FL425 2.9" x 3.1" x 1.6" plastic enclosure; mounts on standard 35mm DIN rail
Model 425 3.25" x 4.5" x 3.0" steel box, with mounting feet

Power: Internal 9V battery, 15mA max

Ground Side (426) Specifications

Channels per Unit: Three independent channels

Output: Voltage signal, equal to M425 input signal; also available with variable gain

Ranges: Four ranges, to match range selected at M425

Frequency Response: Jumper-selectable 8-pole Bessel lowpass filtering at 10kHz, 5kHz, or 2.5kHz

Filter Delay: Dependent on filter frequency; 100uSec for 10kHz, 150uSec for 5kHz, 250uSec for 2.5kHz

Calibration: Dedicated fiber-optic transmitter and 18" cable supplies an optical signal corresponding to zero, +fullscale, or -fullscale, switch selectable

Adjustments: Board-mounted Span and Offset adjustments for each channel

Indicators: One "operating" LED per channel, plus power-on lamp

Power Saver: External relay closure wired to terminal block selects RUN or SLEEP modes for all remote amplifiers

Multiplier: Optional analog multiplier computes product of two jumper-selected channels; typically used to measure power from voltage and current signals

Output Connections: Board-mounted BNCs or rear-panel BNCs (depending on enclosure type)

Mechanical: 19" wide (rack mount) x 1.75" high x 8" deep or 12.8" x 15.5" x 6.8" steel box, with hinged lid and cutouts for fiber optics and wiring

Power: 5V and ±15V, supplied by enclosure-mounted 115VAC power supply

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