Data Acquisition System/Data Logging System Getting Started Guide

1
Getting Started
Introduction
The 2680A Data Acquisition System (DAS) and 2686A Data Logging System
(DLS) provide 20 to 120 channels that operate in conjunction with Fluke DAQ
software to form a data acquisition system.
The 2686A comes with a removable PC Card (PCMCIA) for stand-alone storage
operation. This socket accepts ATA memory cards up to 2 GB in size.
Each 268XA device can hold from 1 to 6 analog modules. These modules are the
precision analog module (PAI), fast analog module (FAI), and the digital IO/relay
and Totalizer module (DIO). These modules are all isolated from one another. If
digital I/O, relay and totalizer capability is required, you can add a digital I/O
module to the device in slot 6 only.
The analog modules measure dc volts, ac volts, ohms, temperature, frequency, and
dc current. Temperature measurements use thermocouples thermistors or
resistance temperature detectors (RTDs). The devices also have extensive
computed math capability. Besides using data collected from the analog modules,
and digital totalizer, time can also be used in computed channel calculations.
The systems scan the 20 to 120 analog channels and calculate the values for the 60
computed channels. Interval timers, alarm conditions, and/or an external signal
input can trigger scans. The Fluke DAQ software configures and controls up to 99
268XA devices via an Ethernet connection. The software provides the means to
view scan data and log it into files.
The two analog modules that may be used with the 268XA are the FAI module and
the PAI module. The PAI modules emphasize precision with 5 ½ digits of
resolution, .02% accuracy, and can withstand up to 150 V common mode voltage
(300 V on channels 1 and 11). The FAI modules emphasize increased
measurement speed with 4 ½ digits of resolution, 0.04% accuracy, and can
withstand up to 50 V common mode voltage.