Products

Features

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

Description

The Model 225 digital frequency to voltage converter (shown right) can be configured in a seven module rack (shown below) or two module carry case. A power supply module 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

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

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 (four periods of input signal) max. (two to three typical) up to 3200 Hz range; higher ranges are eight periods, 16 periods, and 32 periods

Output noise: 2mVRMS max., DC to 100kHz

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

Carrying case: One- and two-module desk-top cases, Model 4009-106 and 4010-110