Measurement-computing Data Acquisition Systems rev.10.4 Bedienungsanleitung PDF herunterladen (Seite 291)

Programmer’s Manual 908594 Daq API Command Reference 4.6-13

Option Type and Value Definitions Continued--DaqOptionType

WBK16 Options

Option Type

(optionType)

Description

Option Value

(optionValue)

Description

DcovWbk16X1_00

Sets PGA gain to: x 1.00

DcovWbk16X1_28

Sets PGA gain to: x 1.28

DcovWbk16X1_65

Sets PGA gain to: x 1.65

DcovWbk16X2_11

Sets PGA gain to: x 2.11

DcovWbk16X2_71

Sets PGA gain to: x 2.71

DcovWbk16X3_48

Sets PGA gain to: x 3.48

DcovWbk16X4_47

Sets PGA gain to: x 4.47

DcovWbk16X5_74

Sets PGA gain to: x 5.74

DcovWbk16X7_37

Sets PGA gain to: x 7.37

DcovWbk16X9_46

Sets PGA gain to: x 9.46

DcovWbk16X12_14

Sets PGA gain to: x 12.14

DcovWbk16X15_58

Sets PGA gain to: x 15.58

DcotWbk16PGA

Provides gain definitions

for the WBK16 PGA

(Programmable Gain

Amplifier)

See Note 1 regarding

Voltage Out & Total Gain.

DcovWbk16X20_00

Sets PGA gain to: x 20.00

DmotWbk16Immediate

Contains option value for

applying Excitation

Voltage.

DmovWbk16ExcSrcApply

Applies the excitation source

voltage that is defined by

DcotWbk16ExcDac.

Note 1: V

OUT

= [(V

x IAG) + DacOffset

SCALED

] x PGA

Where: V

OUT

is Voltage Out, and V

is Voltage In

Note 2: Software Function for Dac Offset (Bridge Offset)

This note pertains to the DcotWbk16OffsetDac option type that is discussed in the preceding table. The Dac

Offset, also referred to as bridge offset, can be set to values in the range of -3.0 volts to +3.0 volts, divided by the

gain of the Instrumentation Amplifier (IAG). To do so, the following conversion is used:

Offset Value = [(Offset Voltage) x IAG x 682.5] + 2047.5

Where: Offset Value is a number in the range of 0.0 to 4095.0.

Example:

In this example we will determine the Offset Value; i.e., an integer in the range of 0 to 4095 that will give us a

desired offset of 0.25 volts. We will make use of the following considerations. Actual applications will vary,

accordingly.

• the Instrumentation Amplifier Gain (IAG) is set to x 10, i.e., DcovWbk16X10

• the desired Offset Voltage is 0.25 volts

Using the above equation we find that our offset value is 3754. The solution follows.

(0.25 x 10 x 682.5) + 2047.5 = 3754

Correlation of Offset Range with Instrumentation Amplifier Gain

IAG Value Allowable Range for Offset Voltage

x 1 ± 3.0 volts

x 10 ± 0.3 volts

x 100 ± 0.03 volts

x 1000 ± 0.003 volts

1 2 ... 286 287 288 289 290 291 292 293 294 295 296 ... 365 366

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