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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.
Gain
×1
×2
×4
×8
×1
×2
×4
×8
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
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.
3-6
DaqBook Hardware
JP3 is a double-wide jumper that must be positioned vertically. Misplacing this jumper
in a horizontal position will damage the unit.
Mode
Volts Range
BI
±5
BI
±2.5
BI
±1.25
BI
±0.625
UNI
0 to +10
UNI
0 to +5
UNI
0 to +2.5
UNI
0 to +1.25
JP4 must be positioned vertically. Positioning JP4 horizontally will damage the unit.
CAUTION
JP3 Unipolar/Bipolar Operation Settings
CAUTION
JP4 Single-Ended/Differential Settings
01-23-02
OMB-DaqBook User's Manual
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