Vishay Micro-Measurements System 7000 Programmer’s Reference Manual
Page 131 of 142
7.4.6.11 Set LVDT Demodulator Source
Length
Command
Group
Command
Code
Card Mask Channel
Mask
Parameters
0x0007 0x06 0x0014
Used Ignored
0x00
Byte 8:
Demodulator Source
Value Demodulator Source
0x00 Positive Reference
1
(default)
0x01 Negative Reference
2
0x02 Common Mode Reference (Secondary)
0x03 Excitation Reference (Primary)
12
Selects the triggering source for the demodulator. The Primary selection is used for 4-wire LVDTs or for
LVDTs that don’t have sufficient common-mode output signal to trigger the secondary winding. The
secondary selection is preferred for 6-, 5-, and 3-wire LVDTs. In this mode, the demodulator trigger is
sourced directly from the secondary winding of the LVDT.
The Positive Reference is the default state and should be selected when excitation is disabled to prevent
oscillation. The System 7000 automatically sets the demodulator source to Positive Reference when the
excitation is disabled. See the ConfigureLVDTCardExcitation method.
To Next Page