Pickering 41-670 - VSum and VDiff Voltage Control

SECTION 4 - PROGRAMMING GUIDE
Page 4.13
PXI/PXIe LVDT/RVDT/Resolver Simulator Module 41/43-670
pickering
VSum / VDiff Example
Vsum / Vdiff is a different way of controlling an LVDT by setting the voltage characteristics. Vsum denes the
maximum voltage of the LVDT outputs. Rather than position, Vdiff adjusts the difference between the two outputs
A and B.
The voltage difference divided by the sum:
VOUT =
(VA − VB)
(VA + VB)
VOUT =
(Vdiff)
(Vsum)
Vsum is a xed value dened by the LVDT being simulated e.g. 4V.
Vdiff is the voltage difference requested between the two outputs.
Note: Vsum/Vdiff can only implemented in Mode1 - the 5/6 wire conguration.
VOUT1= 0.5 * (VSUM + VDIFF) and VOUT2 = 0.5 * (VSUM - VDIFF)
Vsum and Vdiff are in millivolts (mV).
Vsum = 4V = 4000
Vdiff = 1V = 1000
Output A will measure 2.5V and Output B will measure 1.5V, giving a 1V difference (Vdiff).
Conguration:
Select Bank1 to ‘Local’
Select ‘Mode1 5/6 Wire’
Apply excitation signal 7VRMS
Bank1:
Click ‘Auto Input Gain’
Set ‘Maximum Output Voltage (mV) (Vsum)’ to 4,000 which is 4V
Set ‘Output A/B Vdiff (mV)’ to 1,000 which is 1V