General Description & Features
Each 3000 Series instrument comes in three basic forms. The "form" of a particular instrument is indicated by the second digit of its model number (e.g., a Model 3130 is a "Form 1" instrument; a Model 3263 is a "Form 2" instrument; a Model 3378 is a "Form 3" instrument).
FORM 1: Signal Conditioner
FORM 2: Signal Conditioner with Digital Indication
FORM 3: Signal Conditioner with Digital Indication and HI-LO Limits
The third and fourth digits of a 3000 Series instrument's model number identify the "type" of signal source, as follows:
- "30" = AC LVDT
- "40" = Frequency (AC or pulse input signal)
- "63" = Miscellaneous DC Analog Voltage
- "70" = DC-Excited Strain Gage Transducer
- "78" = AC-Excited Strain Gage Transducer
3000 Series options include
- Analog Peak Capture
- 4-20 mA Current Output
- 0-10 VDC Dual Galvanic Isolated Output
- Internal Electromechanical Relays
- Internal Solid-State Relays
- 12 VDC Battery-Powered Operation
- Nominal 230 VAC Operation
These instruments can accommodate any of the conventional transducer types listed above.
With built-in regulated excitation, selectable low-pass active filtering, and internal reference calibration standards, they produce the most accurate drift-free analog outputs possible. Calibration can be accomplished by front-panel push buttons, or, when used with a centralized data acquisition system, by a common logic command line.
Signal Conditioner with Digital Indication
To the basic signal conditioning capability of Form 1 instruments, "Form 2" 3000 units add three selectable scales for vivid, rock-solid LED readout of all measured inputs.
The three data-display scales are ±5000 by "1's," ±10000 by "2's," and ±20000 by "5's." Selectable decimal-point locations along with optional dummy zero give decade multiplier factors from 0.0001 to 10.
Sampling rate of the digital display is three samples per second. All conditioner/indicators are supplied with a large assortment of engineering unit legends on a convenient 4" x 5.5" dry transfer sheet (shown below). For full display specifications, see General Specifications.
Signal Conditioner with Digital Indication and HI-LO Limits
To the basic signal conditioning capability of Form 1 instruments and the data display capability of Form 2 Instruments; each "Form 3" instrument adds two control set points. These are independently adjustable over the full ± range, via front-panel Coarse and Fine controls.
Each set point may be designated as either a HIGH or a LOW limit value. Thus, three limit modes are available. Units are normally shipped with LOW/OK/HIGH mode activated, but you can easily rewire for either BOTH LIMITS HIGH or BOTH LIMITS LOW. A front-panel "Push-to-Set" button for each limit lets you display the respective setting in proper engineering units.
Individual red front-panel LED's indicate HIGH or LOW LIMIT VIOLATION. Such indication is normally nonlatching, but latching mode is also available. A single green LED indicates NO VIOLATION ("OK").
Both true and complement TTL-compatible logic outputs are available for each limit condition (LOW, OK, HIGH)—see General Specifications. These outputs are normally disabled as soon as the violation condition ceases to occur, but latching mode is also available.
Optional internal electromechanical or solid-state relays are available for all "Form 3" instruments, to allow the switching of power for annunciation and process control on the basis of existing limit conditions (see "R" or "S" Option).
- Analog signal conditioning with multipole low-pass active filtering and regulated, remotely sensed excitation
- "Live" voltage outputs (+/- 5 Vdc full scale)
- Front-panel setup
- 6-digit LED digital indication
- Selectable analog filtering
- Dual limit monitoring with front-panel annunciation and isolated logic control outputs
- "Live" current outputs (4-20mA)
- Galvanic isolated outputs (+/- 10 Vdc output full scale)
- Real-time analog peak capture
- Internal control relays
- DC-powered operation