Vishay Micro-Measurements System 7000 Programmer’s Reference Manual
Page 128 of 142
7.4.6.4 Shunt Calibration Resistor Enable / Disable
Length
Command
Group
Command
Code
Card Mask Channel
Mask
Parameters
0x0007 0x06 0x000C
Used Used Byte 8:
0x00 – Shunt Disable
0x01 – Shunt Enable
This command only applies to strain gage cards. It enables / disables the parallel shunt cal resistor across
the dummy resistor. The hardware automatically selects the appropriate shunt value for the current
dummy resistor selection. This is only applicable in a quarter bridge configuration.
In ordinary operation the shunt calibration resistor is disabled. Enable it when you are performing a shunt
cal procedure.
7.4.6.5 Dummy Resistor Selection
Length
Command
Group
Command
Code
Card Mask Channel
Mask
Parameters
0x0007 0x06 0x000D
Used Used Byte 8:
CMD:
0x00 – Open Circuit
0x01 – 120 Ohm
0x02 – 350 Ohm
0x03 – 1000 Ohm
This is a Strain Gage only command which selects the dummy resistor to use in a quarter bridge
configuration. If your strain gage is not a quarter bridge configuration, select 0x00:Open. Because the
1000 ohm resistor is socketed, it may be replaced with a different value resistor. If this is the case choose
the 1000 ohm (socket) selection.
7.4.6.6 Enable Half-Bridge
Length
Command
Group
Command
Code
Card Mask Channel
Mask
Parameters
0x0007 0x06 0x000E
Used Used Byte 8:
0x00 – Bypass
0x01 – Enabled
Enables or bypasses the half-bridge. This command is used for strain gage and LVDT Cards.
If your strain gage channel is not a half-bridge configuration this should be set to bypass. With LVDT
cards, in normal usage half-bridge is bypassed for 6-, 5-, and 4- wire LVDT inputs. It is enabled for 3-
wire LVDT inputs.
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