Measurement-computing Daq PC-Card Manual do Utilizador descarregar pdf (Página 34)

DaqBook/100, /112, /120, /200, /216 Daq* Hardware

3-4

10-18-00

DaqBook/DaqBoard/Daq PC-Card User’s Manual

External Analog Expansion Power (JP1)

This 4×2 header (JP1) has 3 possible settings. If analog option cards (DBKs) are used, the JP1 pins are set

to provide +15 and -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. Refer also to the Power

Management section in the chapter DBK Option Cards and Modules.

DAC Reference Selection (JP2)

This 5×2 header (JP2) 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 register count varies from 0 to 4095 (12-bit). If an external voltage reference is desired (up to +10 VDC

or –10 VDC), 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.

Note: The SSH setting is used with DBKs: 2, 4, 5, 7, 17, 50, and 51. Refer to the DBK chapter (4) 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

INT

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/Timer Use

(16-bit Mode Only)

JP1

-15 V

-OCTOUT

-OCLKIN

+15 V

DBK32A or DBK33

Option Card Use

JP1 External Analog Expansion Settings

1 2 ... 29 30 31 32 33 34 35 36 37 38 39 ... 61 62

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