Vishay Micro-Measurements System 7000 Programmer’s Reference Manual
Page 83 of 142
6.5.4.18 ConfigureLVDTChannelInputConnections Method
Syntax:
HRESULT _stdcall ConfigureLVDTChannelInputConnections (in long CardNo, in long
ChannelNo, in long HalfBridgeEnable, in long Source, out retval long *result );
Description:
Defines the input configuration for LVDT cards (Primary, Secondary, and Half-Bridge).
Arguments:
CardNo The card number (1-16).
ChannelNo The channel number (1-8)
HalfBridgeEnable
Enables (or Bypasses) the half-bridge circuitry. In normal usage half-
bridge is bypassed for 6-, 5-, and 4-wire LVDT inputs. It is enabled for 3-
wire LVDT inputs.
0 = Bypass (default)
1 = Enable
Source Selects the triggering source for the demodulator.
0 = Positive Reference (default)
1 = Negative Reference (used only in test mode)
2 = Secondary
3 = Primary
Returns:
0 if Successful, otherwise an Error Code
Notes:
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.
6.5.4.19 SetDefaultFilter Method
Syntax:
HRESULT _stdcall SetDefaultFilter(in long CardNo, in long ChannelNo, in long ScanRate, out
retval long * result );
Description:
Sets the filter for the channel to be the default filter for the scan rate.
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