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National Instruments Corporation 2-1 DAQ Hardware Overview Guide
2
Lab and 1200 Devices
This chapter contains overview information on the DAQCard-1200,
DAQPad-1200, Lab-PC+, Lab-PC-1200, Lab-PC-1200AI, PCI-1200,
and SCXI-1200 devices.
Lab and 1200 Devices Analog Input
The Lab and 1200 devices contain eight single-ended analog input channels
numbered 0 through 7. The analog input channels are multiplexed into a
single programmable gain stage and 12-bit ADC. The devices have gains
of 1, 2, 5, 10, 20, 50, and 100.
You can configure the input channels to be differential or nonreferenced
single ended. In differential mode, four channels are available, namely, 0,
2, 4, and 6. All Lab and 1200 devices except the Lab-PC+ support software
configuration of the input mode; on the Lab-PC+, configure the mode via
jumper W4.
You can hardware jumper-configure analog input on the Lab-PC+ and
software configure analog input on all other Lab and 1200 devices for two
different input ranges:
• 0 to +10 V (unipolar)
• −5 to +5 V (bipolar)
You can initiate A/D conversions through software or by applying active
low pulses to the EXTCONV* input on the device I/O connector. Each of
the devices has a FIFO on the device in which to store the results of A/D
conversions temporarily. Table 2-1 shows the FIFO sizes.
Table 2-1.
Lab and 1200 Devices and Corresponding FIFO Size
Device FIFO Size (in words)
Lab-PC+ 512
DAQCard-1200, DAQPad-1200,
Lab-PC-1200, Lab-PC-1200AI, PCI-1200,
SCXI-1200
2,048
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