Measurement-computing DaqBoard-ISA Bedienungsanleitung PDF herunterladen (Seite 22)

3-4 Hardware

02-14-02

DaqBoard-ISA User’s Manual

External Analog Expansion Power (JP1)

The JP1 4×2 header has 3 possible settings.

If analog option cards (DBKs) are used, the

JP1 pins are set to provide ±15 VDC to the

cards. If such cards are not used, the

counter/timer CTR0 is available, and JP1

must be set accordingly. The default

setting is for use of analog option cards.

&$87,21

If using a DBK32A Auxiliary Power Supply or a DBK33 Triple-Output Power

Supply Card, the JP1 shunt jumpers must be entirely removed. Placing the

jumpers on -OCTOUT and -OCLKIN will damage the 8254 timer chip.

Reference Note:

Refer to the Power Management section of the DBK Option Cards and Modules User’s

Manual (p/n 457-0905), as needed.

DAC Reference Selection (JP2)

The JP2 5×2 header allows you to select internal or external voltage references for the two separate analog

outputs. If the internal -5 VDC reference is selected, either DAC can output from 0 to +5 VDC as the

either polarity), the shunt jumpers must be set accordingly. There is also a provision to allow the outputting

of a simultaneous Sample-Hold command signal on the DAC1-REFIN pin with the DAC1 set up for an

internal reference.

&$87,21

The SSH setting cannot be used at the same time as a DAC1 external reference due

to a potentially damaging conflict on P1 pin #26. The defaults are both DAC0 and

DAC1 set to Internal Reference.

Reference Note:

The SSH setting is used with DBKs: 2, 4, 5, 7, 17, 50, and 51. In regard to specific DBK

information, refer to the DBK Option Cards and Modules User’s Manual (p/n 457-0905),

as needed.

JP2 JP2 JP2

JP2

Factory Default

DAC0 External Ref

DAC1 External Ref

DAC0 External Ref

DAC1 Internal Ref

DAC0 Internal Ref

DAC1 External Ref

DAC0 Internal Ref

DAC1 Internal Ref

DAC0 External Ref

DAC1 Internal Ref

with SSH

DAC0 Internal Ref

DAC1 Internal Ref

with SSH

EXT

INT

SSH

IN T

EXT

DAC1

DAC0

JP2

JP2 DAC Reference Settings

JP1

-15 V

-OCTOUT

-OCLKIN

+15 V

Analog Option

Card Use

JP1

-15V

-OCTOUT

-OCLKIN

+15 V

Counter/Tim er U se

(16-bit mode only)

JP1

-15 V

-OCTOUT

-OCLKIN

+15 V

DBK32A or DBK33

Option Card Use

JP1 External Analog Expansion Settings

Factory

ault

1 2 ... 17 18 19 20 21 22 23 24 25 26 27 ... 45 46

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