Introduction; Calibrating And Testing The Analog Outputs; Calibration - GE AquaTrans AT868 Abridged Manual

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Introduction

Calibrating and Testing

the Analog Outputs

Follow the instructions in this chapter to calibrate and test the AT868

analog and totalizer/frequency outputs. Refer to Figure A-4 on page

A-4 in Appendix A, Menu Maps, while following the calibration

instructions.

The AT868 includes one built-in analog output per channel with a

resolution of 5.0 μA (0.03% full scale). Typically, Output A is used

for Channel 1 and Output C is used for Channel 2. However, either

output can be configured for use with either channel. Both the low

and high values for the analog outputs must be calibrated. After the

end points are calibrated, the linearity should be tested.

Note: The zero point of the analog output may be set for either 0 mA

or 4 mA. However, the calibration procedure always uses the 4

mA point, as the meter will extrapolate this value to obtain the

0 mA point.

Prepare for calibration by connecting an ammeter in series with the

load on analog output 1 or 2 as shown in Figure 4-1 below. DO NOT

connect the ammeter directly across the terminals. Refer to Figure 1-5

on page 1-16 for the locations of the analog outputs terminal blocks.

Note: Analog outputs 1 and 2 in the wiring diagram correspond to

analog outputs A and C in the AT868 software.

FREQ1

Figure 4-1: Ammeter Connection

September 2004

AOUT1

Load

Ammeter

4-1

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