Vishay Micro-Measurements
System 7000 Programmer’s Reference Manual
Page 20 of 142
LVDT Cards
Set the frequency and enable the excitation voltage.
Note: There is interdependence between the excitation state and the demodulator source input
configuration. The System 7000 automatically sets the demodulator source to Positive Reference
when the excitation is disabled.
LabVIEW
Configure LVDT Card Excitation VI
Active X
ConfigureLVDTCardExcitation method
Low-level
Set Excitation Frequency command
Set Excitation command
Excitation Output Enable/Disable command
(The excitation frequency and level commands should be
set before the excitation output is enabled.)
Programming tip: It is common to loop through all 16 (or 4) slots in the scanner. If the slot has a card
inserted, query the type of card, and perform the appropriate card-level configuration.
3.7 Channel-level Configuration
Channel-level commands are performed on an individual channel on the card. Remember there are
typically eight channels on a card and each must be set independently. Instructions on how to determine
the appropriate configuration settings is beyond the scope of this manual, see the “System 7000
Instruction Manual”, the StrainSmart help system, or contact the Vishay Micro-Measurements
application
engineering
department for assistance.
All Cards
You must assign a filter to each channel. The filter is based on the scan rate (sampling rate) of
the system. It is recommended that you use the default filter for the scan rate, though it is also
possible to enter your own 252 tap filter.
LabVIEW
Configure Default Filter VI
Active X
SetDefaultFilter method
Low-level
Set Default Filter command
Strain Gage Cards
For strain gage cards you must configure the bridge settings.
LabVIEW
Configure Strain Gage Channel Bridge Settings VI
Active X
ConfigureStrainGageChannelBridgeSettings method
Low-level
Enable/Disable Half Bridge command
Dummy Resistor Selection command
High Level Cards
No channel-level configuration
Thermocouple Cards
Define the thermocouple type
LabVIEW
Configure Thermocouple Channel VI
Active X
ConfigureThermocoupleChannel method
Low-level
Set Thermocouple Type command
