Manual

CF 66 2 Rev. C 2/05
Chapter 14, “DAC Output Channel”, explains the configuration and operation of additional digital-to-analog voltage
or current outputs.
Chapter 15, “Split Display Virtual Channel”, shows how you can display two values from any of the channels in the
instrument at the same time.
Chapter 16, “Mathematics Virtual Channel”, describes the flexibility of customer specific SensoCode programming.
Chapter 17, “Error Messages”, lists error messages that the instrument may display, describes their causes and,
where possible, suggests solutions.
Chapter 18, “Setup Menu Reference”, is a list of all SETUP menus and a cross-reference to related information in
this instruction manual.
1.2 Related Documents
System Calibration Sheet
Every instrument is shipped with a calibration sheet that documents important information specific to each
instrument.
Communications Guide
The DFI 1550/1650 Communications Guide describes in detail how to communicate with a DFI instrument using
RS-232 and RS-485. Wiring diagrams, sample programs, and descriptions of each command are included. You
can also find this manual on our website-
www.cooperinstruments.com.
1.3 What is the DFI Series?
The DFI Series of Signal Conditioners/Indicators are versatile, multi-channel devices designed to operate with
many different types of sensors. Several different chassis types, Input channels, and Output channels are available
to allow the configuration of a DFI instrument to meet a variety of measurement and control needs. The operation
of a DFI instrument is based on digital technology to provide improved accuracy, superior ease of setup, and wealth
of features.
1.3.1 Features
The main features of the DFI series are:
Four alarm limits (optional sixteen), with versatile setup (not available on DFI 1550)
Automatic setup, calibration, and scaling of strain-gate sensors through the use of Signature Calibration
Field selectable, digital, low-pass filtering (“damping”) on each Input channel
Up to ±50,000 part resolution
Field selectable five-, six- or seven-digit (9,999,999 maximum) display
RS-232 communications standard (RS-485 optional)
Local or remote setup using the RS-232 or RS-485 port
Push-button on/off tare feature
No knobs or adjustments
1.3.2 Chassis Models
Several models (i.e. chassis types) are available:
DFI 1550: 1 to 4 physical channels, 3/8 DIN case, no limits or peak detector
DFI 1650: 1 to 4 physical channels, 3/8 DIN case
DFI 1650 PT: 1 to 4 physical channels, portable case
DFI SC3004: 1 to 14 physical channels, 19” rack mount case, 1 to 3 quad-line displays
1.3.3 Channel Types
Channels can be one of three types: Input, Output, or Virtual
Input Channels
Input channels are hardware circuit boards with a unique channel number. Currently, they are available for the
following types of sensors: