Calibrating The Analog Input Subsystem; Choosing A Calibration Reference; Configuring For The Internal Reference - Measurement Computing Data Translation DT3010 Series User Manual

Calibrating the Analog Input Subsystem

This section describes how to configure the DT740, STP268, or STP268-EC screw terminal
panel for an internal or external reference, and how to use the DT3010 and DT3016 calibration
utilities to calibrate the analog input subsystem of the board.

Choosing a Calibration Reference

To calibrate the analog input circuitry, you can use either of the following references:
• The internal +5 V reference on the DT3010 Series board.
Using the +5 V reference on the board allows you to calibrate the analog input circuitry
quickly without using external equipment; the accuracy of the calibration is
approximately 0.05%.
• An external +9.3750 V reference (precision voltage source).
Using an external +9.3750 V reference provides an accuracy of approximately ±1 LSB.
This section describes how to configure for an internal or external reference. If you are using
STP268, it must be attached to connector J1 in all the steps below.

Configuring for the Internal Reference

To calibrate the analog input circuitry using the internal +5 V reference, do the following:
1. Connect Analog In 0 to +5 V Reference Out.
Signal
Analog Input 0
+5 V Reference
2. Connect Analog In 0 Return to Analog Ground.
Signal
Analog Input 0 Return
Analog Ground
DT740 Screw STP268 Screw
Terminal Terminal on J1
TB1 TB1
TB49 TB44
DT740 Screw STP268 Screw
Terminal Terminal on J1
TB2 TB2
TB34 TB34
STP268-EC
Screw Terminal
TB34
TB50
STP268-EC
Screw Terminal
TB68
TB52
Calibration
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