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Measurement Computing Daq PC-Card User Manual

Page 34

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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.

JP 2

JP 2

JP 2

JP 2

JP 2

Fa cto ry D e fa u lt

D A C 0 E xte rn al R e f

D A C 1 E xte rn al R e f

D A C 0 E xte rn al R e f

D A C 1 In te rn al R e f

D A C 0 In te rn al R e f

D A C 1 E xte rn al R e f

D A C 0 In te rn al R e f

D A C 1 In te rn al R e f

D A C 0 E xte rn al R e f

D A C 1 In te rn al R e f

w ith S S H

D A C 0 In te rn al R e f

D A C 1 In te rn al R e f

w ith S S H

E X T

IN T

S S H

IN T

E X T

D A C 1

D A C0

JP 2

JP2 DAC Reference Settings

JP 1

-1 5 V

-O C TO U T

-O C L K IN

+1 5 V

A n a lo g O ptio n

C ard U se

JP 1

-1 5V

-O C TO U T

-O C L K IN

+1 5 V

C o un te r/Tim e r U se

(1 6-bit M o d e O nly)

JP 1

-1 5 V

-O C TO U T

-O C L K IN

+1 5 V

D B K 3 2A o r D B K 3 3

O p tio n C a rd U se

JP1 External Analog Expansion Settings