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3-6 DaqBook Hardware

01-23-02

DaqBook User’s Manual

Bipolar or Unipolar A/D Operation (JP3)*

*Hardware Setting For DaqBook/100, DaqBook /112, and DaqBook /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.

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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

×1BI ±5

×2BI ±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

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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 previous figure).

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

daq200SetMode and daq200SetScan commands.

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Measurement-computing 200 Series DaqBook Manuale Utente Pagina 24