Input:gain; Input:gain <Gain>,(@<Ch_List>) - VXI VT1422A User Manual

INPut

INPut:GAIN

Note
Parameters
Comments
Usage
300 VT1422A Command Reference
INPut:GAIN <gain>,(@<ch_list>)
SCP or RSCU.
An important thing to understand about input amplifier SCPs and RSCUs is that given
a fixed input value at a channel, changes in channel gain do not change the value
returned from that channel. The DSP chip (Digital Signal Processor) keeps track of
SCP gain and A/D range amplifier settings and "calculates" a value that reflects the
signal level at the input terminal. The only time this in not true is when the SCP gain
chosen would cause the output of the SCP amplifier to be too great for the selected
A/D range. As an example, with SCP gain set to 64, an input signal greater than
±0.25 volts would cause an over-range reading even with the A/D set to its 16 volt
range.
Parameter Parameter
Name Type
gain numeric (float32)
discrete (string)
ch_list channel list (string)
•
A programmable amplifier SCP or RSC has a choice of several discrete gain
settings. The gain set will be the one closest to the value specified by <gain>.
Refer to the SCP manual for specific information on the SCP being
programming. Sending MAX will program the highest gain available with the
SCP installed. Sending MIN will program the lowest gain.
•
Sending a value for <gain> that is greater than the highest or less than the lowest
setting allowable for the SCP will generate a -222 "Data out of range" error.
•
When Accepted: Not while INITiated
•
Related Commands: INP:GAIN?
•
*RST Condition: gain set to MIN
•
Send with VXIplug&play Function: hpe1422_cmd(...)
INP:GAIN 8,(@100:119)
INPUT:GAIN 64,(@155)
sets the channel gain on programmable amplifier
Range of
Values
see comment |
MIN | MAX
100 - 163
Set gain of 8 for first 20 channels
Set gain of 64 for SCP channel 55
Default
Units
none
none
Chapter 7