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Chapter 2 Function Reference — SCXI_Set_Gain
NI-DAQ FRM for PC Compatibles 2-360
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National Instruments Corporation
SCXI_Set_Gain
Format
status = SCXI_Set_Gain (SCXIchassisID, moduleSlot, channel, gain)
Purpose
Sets the specified channel to the given gain or range setting on any SCXI module that
supports programmable gain settings. Currently, the SCXI-1100, SCXI-1102, VXI-SC-1102,
SCXI-1122, SCXI-1126, and SCXI-1141 have programmable gains; the other analog input
modules have hardware-selectable gains.
Parameters
Input
Parameter Discussion
channel is the module channel you want to change the gain or range setting for. If
channel =–1,
SCXI_Set_Gain changes the gain or range for all channels on the module.
The SCXI-1100 and SCXI-1122 have one gain amplifier, so all channels have the same gain
setting; therefore, you must set channel = –1 for those modules.
gain is the gain or range setting you want to use. Notice that gain is a double-precision
floating point parameter. Valid gain settings depend on the module type:
SCXI-1100: 1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, 2,000.
SCXI-1102/VXI-SC-1102: 1, 100.
SCXI-1122: 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, 1, 2, 5, 10, 20, 50, 100, 200, 500, 1,000, 2,000.
SCXI-1126: 250, 500, 1,000, 2,000, 4,000, 8,000, 16,000, 32,000, 64,000, 128,000.
SCXI-1141: 1, 2, 5, 10, 20, 50, 100.
Name Type Description
SCXIchassisID i16 chassis ID number
moduleSlot i16 module slot number
channel i16 module channel
gain f64 gain or range setting