Products

Features

• Internal crystal calibration source
  
• Six frequency ranges
  
• Input isolation to 1000V
  
• Analog output

Description

The Model 227 is a wide band frequency to voltage converter module. The input signal is transformer coupled to the amplifier circuit. An internal cal frequency equal to the full scale frequency can be activated through a front panel push button. It has
a six position switch with frequency selections of 200Hz, 500Hz, 1kHz, 2kHz, 5kHz and 10kHz. The operational frequency range is 10Hz to 10kHz.
The DC output signal can be monitored via a
BNC connector on the front panel. The Model 227 module works in conjunction with a six-module
rack for up to six channels or a two-module carry case.

Specifications

Input: 0.025V peak to 100V peak

Input isolation: Transformer isolated

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

Input comparator: Front panel threshold adjustable from 0 to 1VDC, after transformer AC coupling

Frequency range: Six fullscale ranges, selected with front panel switch: 200Hz, 500Hz, 1kHz, 2kHz, 5kHz, 10kHz

Internal calibration: Crystal oscillator provides 100% fullscale calibration signal

Analog output: 0-10VDC fullscale output, with front panel trimpot to adjust span; front panel BNC for voltmeter monitoring

Output suppression: Front panel trimpot and switch allows output voltage to be offset to allow better monitoring of small frequency variations

Output noise: 50mV p-p ripple

Mechanical: 19"W x 5.25"H x 11"D, six-module rack adapter, Model 4015-111

Carrying case: Two-module desktop case, Model 4017-110