ADLINK PCI-9810 - Manual (Page 43)

Operation Theory 31
5.2 Signal Source Control
To control the A/D signal source, the signal type, signal channel,
and signal range must be determined.
Signal Type
The A/D signal sources of PCI-9812/9810 are single-ended (SE).
Channels
There are four channels for SE mode. The ADC Channel Enable
Register controls the channel number. Refer to section 4.1.
Signal Range and Input impedance
The proper signal range is important for data acquisition. The
available signal input ranges for the PCI-9812/9810 are
±
5 V or
±
1
V, which are set by soldering the copper pads on the PCB. The
input impedance for high-speed applications should also be
considered. The selectable input impedance values are 50
Ω, 1.25
K, 15 M
Ω. Refer to section 2.3 for details.