Signal Channel - Ametek 7280 Instruction Manual

Chapter 6, COMPUTER OPERATION

6.4.01 Signal Channel

IMODE [n]
VMODE [n]
CP [n]
FLOAT [n]
SEN [n]
SEN.
6-10
Current/Voltage mode input selector
The value of n sets the input mode according to the following table:
n Input mode
0 Current mode off - voltage mode input enabled
1 Normal current mode enabled - connect signal to B input connector
2 Low noise current mode enabled - connect signal to B input connector
3 High bandwidth current mode enabled - connect signal to B input connector
If n = 0 then the input configuration is determined by the VMODE command.
If n > 0 then current mode is enabled irrespective of the VMODE setting.
Voltage input configuration
The value of n sets up the input configuration according to the following table:
n Input configuration
0 Both inputs grounded (test mode)
1 A input only
2 -B input only
3 A-B differential mode
Note that the IMODE command takes precedence over the VMODE command.
Input connector coupling mode control
The value of n sets up the input coupling mode according to the following table:
n Coupling mode
0 Fast
1 Slow
Input connector shield float/ground control
The value of n sets the input connector shield switch according to the following table:
n Selection
0 Ground
1 Float (connected to ground via a 1 kΩ resistor)
Full-scale sensitivity control
The value of n sets the full-scale sensitivity according to the following table,
depending on the setting of the IMODE control: