Products

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 9V battery, eliminating the other isolated connection in standard amplifiers.

The high-side unit is available in either DIN-rail mounted packaging (Model FL425) or steel box (Model 425); the ground-side unit is available in either 19" rack-mount or wall-mount box enclosures

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 Model 425 input
to Model 426 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: Model FL425 - Twelve wireclamp screw terminals accept wire sizes from 24-14 gauge; Model 425 - Three-position terminal block accepts standard crimp lug

Mechanical: Model 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

Channels per unit: Three independent channels

Output: Voltage signal, equal to Model 425 input signal; also available with variable gain

Ranges: Four ranges, to match range selected at Model 425

Frequency response: Jumper-selectable eight-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