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Measurement Computing Daq PC-Card User Manual

Page 35

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Daq* Hardware

DaqBook/100, /112, /120, /200, /216

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

10-18-00

3-5

Bipolar or Unipolar A/D Operation (JP3)*

*Hardware Setting For DaqBook/100, /112, and /120 Only

The A/D converter in the DaqBook can be operated in two modes, bipolar or unipolar. In the bipolar mode
(default setting), input voltages up to ±5 VDC can be applied (on the ×1 gain range). In the unipolar mode,
positive voltages up to 10 VDC may be applied (×1 gain range). Refer to the table below for gain, range,
and mode relations.

&$87,21

JP3 is a double-wide jumper that must be positioned vertically. Misplacing this jumper
in a horizontal position will damage the unit.

Gain

Mode

Volts Range

×1

BI

±5

×2

BI

±2.5

×4

BI

±1.25

×8

BI

±0.625

×1

UNI

0 to +10

×2

UNI

0 to +5

×4

UNI

0 to +2.5

×8

UNI

0 to +1.25

JP3 Unipolar/Bipolar Operation Settings

Note: For the DaqBook/100, /112, and /120, set the jumpers to the desired position as shown in figure.

Note: For the DaqBook/200, /216, and /260 the Unipolar/Bipolar option is selected via software by the

daq200SetMode and daq200SetScan commands.

Single-ended or Differential Analog Input Channels (JP4)*

*Hardware Setting For DaqBook/100, /112, and /120 Only

&$87,21

JP4 must be positioned vertically. Positioning JP4 horizontally will damage the unit.

JP4 Single-Ended/Differential Settings

JP4 is a 3×2 header used to configure the 16 analog input lines as 16 single-ended channels or as 8 pairs of
differential channels. In general, if the DaqBook is going to be used in the stand-alone mode (no analog
expansion cards), either mode can be used. If analog expansion cards (each DBK capable of
sixteen single-ended or differential inputs) are used, the single-ended mode must be used. The default
setting is thus single-ended. Place the jumpers in the desired position (see figure).

Note: For the DaqBook/200, /216, and /260, the Unipolar/Bipolar option is selected via software by the

daq200SetMode and daq200SetScan commands.