WCL488 Series Water Cooled Electronic Loads
Operation & Programming Manual
TDI-Dynaload Division
Page 88
402828, Rev. B1
XM External Modulation
Description
This command places the load in Remote Programming mode. In
this mode a 0 to 10V signal at the load’ s Remote Programming Input
terminal on the back of the unit will program the load from zero to
full scale of the selected range. This is inverted when in Constant
Voltage mode so that zero programs full scale while 10V programs
zero.
When in Constant Current mode a digitally programmed offset
current can be specified. This is done using the “ XM PLUS <NR2>”
syntax. “ XM + <NR2>” is an alternate syntax that can be used as
well. In any mode other than Constant Current the offset
specification will be ignored.
The query form of this command returns only the XM ON/OFF
status. The digitally programmed current offset issued with a XM
PLUS (or XM +) command can be read back using either a CI? or
I1? query.
Command Syntax
XM ON
XM OFF
XM PLUS <NR2> or XM + <NR2>
Example
XM ON
This will place the load in Remote Programming mode.
XM PLUS 45.0 (or XM + 45.0)
When in Constant Current mode this will place the load into Remote
Programming and apply a digitally programmed offset of 45 Amps.
In any mode other than Constant Current it will act the same as the
XM ON command.
XM OFF
This turns off Remote Programming and resumes internal digitally
programmed operation.
Query Syntax
XM?
Returned Parameters Text On:
Text Off:
EXTERNAL MODULATION ON
EXTERNAL MODULATION OFF
1 (meaning On)
0 (meaning Off)