Encore Electronics, Inc.

MODEL 225 DIGITAL FREQUENCY TO VOLTAGE CONVERTER

Features
  • Fast response
  • High accuracy
  • Input isolation to 1000 V
  • Digital and analog outputs

Description

The Model 225 consists of up to seven channels in a 19" wide x 7" high x 17.5" deep rack adaptor. A power supply module also plugs into the rack, and provides the required unregulated DC voltages to operate the system. Operation of the unit is over a wide band of frequencies from 0.5Hz to 25,600Hz. The output is in both 16-bit digital and analog voltage format. Two switch selectable precision calibration points are available in each module.

[channel photo]Specifications

Input: 0.025V peak to 100V peak

Input isolation: Transformer isolated to 1000VRMS, or direct coupled

Common mode rejection: 2.5VRMS DC to 1kHz will not trigger the unit

Input comparator: Front panel adjustable trigger threshold from 0.02V to 10V; front panel tipjacks for voltmeter monitoring

Frequency ranges: Front panel switch selects one of eight fullscale ranges: 200Hz, 400Hz, 800Hz, 1600Hz, 3200Hz, 6400Hz, 12800Hz, or 25600Hz

Low-input cutoff: Input signal below 0.25% will cause outputs to go to zero and a no-input indication to light

Pulse output: Logic level (0-5V) output at the input frequency

Digital outputs: Frequency 16-bit binary number, 0 to 65535
Data valid One bit
No input One bit
Selected range Three bits
Data enable
strobe input		 One bit

Analog output: Jumper selectable 0-5VDC or 0-10VDC fullscale output, with front panel trimpots to adjust span and zero; front panel tipjacks for voltmeter monitoring

Calibration: Internal crystal oscillator provides 10% and 100% fullscale calibration frequencies on remote command or by front panel switch

Output accuracy: ±0.05% of fullscale reading

Transient response: 4/f (4 periods of input signal) max (2 to 3 typical) up to 3200 Hz range; Higher ranges are 8 periods, 16 periods, and 32 periods

Output noise: 2mV RMS max, DC to 100kHz

Mechanical: 19"W x 7"H x 17.5"D, 8 module rack adapter, Model 4007-136

Carrying case: 1 and 2 module desktop cases, Model 4009-106 and 4010-110

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