Measurement-computing CIO-DAS16 Instrukcja Użytkownika Pobierz pdf (Strona 7)

1.6 D/A CONVERTER REFERENCE JUMPER BLOCK

There is a jumper block with 10 pins (2 rows of 5 each) located top center on the board. This block allows you to use the

on-board precision voltage reference or an external voltage to provide reference to either or both of the digital-to-analog

converters.

If you choose to use the on-board voltage reference rather than an external voltage, two D/A reference input pins, 10 and

26, on the 37-pin connector are not needed as reference inputs.

The 'S' jumper in this block is used to place a synchronizing signal on pin 26 so that the CIO-SSH16 external accessory

Simultaneous Sample & Hold board can be used.

If the on-board D/A reference is used, the jumpers are set in the I1 and I0

positions (Figure 1-6). The board is configured this way at the factory. The

SS&H output is not connected. If an external reference is desired, move the

blocks to X0 and X1. If using a CIO-SSH16 board, leave the blocks on I0

and I1 and place a block on SS&H. To avoid possible damage in the event

of a bad connection, do not install jumper S unless you intend to connect a

CIO-SSH16 board. There is a spare shorting block on one of the 'S' pins.

Figure 1-6. Ref. Volt and SS&H Jumpers

1.7 RANGE SWITCH SETTING

A bank of six dip switches accessible through the CIO-DAS16 connector bracket control the UNIPOLAR/BIPOLAR

analog input range (Figure 1-7).

Figure 1-7. Range Select Switches

These switches control the analog input range values of all channels. You can use Table 1-1 and Figure 1-7, or use the

Insta

Cal program to determine the correct positions of switches S1 through S6 for the range you desire.

D/A 0

INTERNAL &

EXTERNAL

D/A 1

EXTERNAL &

INTERNAL

X I1 S I0 X

BIPOLAR - SW 6 ONLY

USER GAIN SELECTED

SW 2 - 4

SELECT THE RANGE

SW #

UNIPOLAR

NO USER GAIN

LEFT

The factory setting of +/- 5V

shown.

SEE TABLE 1-1

1 2 3 4 5 6 7 8 9 10 11 12 ... 35 36

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Measurement-computing CIO-DAS16 Instrukcja Użytkownika Strona 7