Keithley KPCI-3110, User Manual

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2-16 Functional Description KPCI-3110 and KPCI-3116 User’s Manual
Analog output features
Two analog output (D/A) subsystems are provided on KPCI-3110 and KPCI-3116 boards. The
first D/A subsystem contains the majority of analog output features. The second is dedicated to
threshold triggering only (refer to
page 2-18 for information on analog threshold triggering).
This section describes the following features of the first D/A subsystem:
•
Analog output resolution
• Analog output channels
•
Output ranges and gains
• Output filters
•
D/A output clock sources
• Trigger sources
•
Analog output conversion modes
• Data formats and transfer
•
Error conditions
Analog output resolution
KPCI-3110 boards have a fixed analog output resolution of 12 bits. The KPCI-3116 boards have
a fixed analog output resolution of 16 bits. The analog output resolution cannot be changed in
software.
Analog output channels
KPCI-3110 and KPCI-3116 boards support two differential analog output channels (DAC0 and
DAC1). Refer to
Section 3 for information on how to wire analog output signals to the board
using the screw terminal panel.
Within each DAC, the digital data is double buffered to prevent spurious outputs, then output as
an analog signal. Both DACs power up to a value of 0V ±10mV. Note that resetting the board
does not clear the values in the DACs.
KPCI-3110 and KPCI-3116 boards can output data from a single analog output channel or from
two analog output channels. The following subsections describe how to specify the channels.
Specifying a single channel
The simplest way to output data to a single analog output channel is to specify the channel for a
single value analog output operation using software; refer to
page 2-19 for more information on
single value operations.
You can also specify a single analog output channel using an analog output channel list,
described in the next section.
Specifying one or more channels
You can specify one or two analog output channels in the analog output channel list, either start-
ing with DAC 0 or with DAC 1.
Values are output simultaneously to the entries in the channel list.