
©
National Instruments Corporation 12-1 DAQ Hardware Overview Guide
12
SC-204
X
Accessories
This chapter contains overview information on the SC-2040,
SC-2042-RTD, and SC-2043-SG.
SC-2040 Track-and-Hold Accessory
The SC-2040 simultaneously amplifies and samples up to eight differential
inputs and sends them in parallel as differential signals to an E Series
DAQ device. The SC-2040 has eight amplifiers, each with a DIP-switch
programmable gain of 1, 10, 100, 200, 300, 500, 600, 700, or 800. You can
power the SC-2040 from either the DAQ device or from an external 5 V
power supply. You can initiate scanning of the SC-2040 channels through
software or through an external trigger.
The track-and-hold circuitry acquires signals within 7 µs, and when hold
mode is enabled, the signals settle within 1 µs. Then the E Series device
samples the SC-2040 channels as fast as possible, after which the SC-2040
is put into track mode again.
If you have configured your SC-2040 in Measurement & Automation
Explorer, you do not have to call
SC_2040_Configure because NI-DAQ
will retrieve the SC-2040 settings from the configuration file.
To take a single snapshot of voltages from several channels with NI-DAQ
functions, you use the
SCAN_Setup function followed by either
AI_Read_Scan or AI_VRead_Scan. To scan a group of channels
repeatedly, use the
SCAN functions.
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