VXI TECHNOLOGY SVM2608 - Manual (Page 35)

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SVM2608 Programming 35
Control Register (0x08, 0x30, 0x58, 0x80, 0xA8, 0xD0) — Read & Write
D10 LINEAR/FIFO
Linear or FIFO Memory Mode - Determines whether the data is
captured in Linear (burst) or FIFO (real time) acquisition mode.
0 = Linear mode
1 = FIFO mode
P
on
state = 0
D9 - D8
2WIREOHMS/
4WIREOHMS
Function Setting - The digitizer is capable of measuring voltages,
resistances in 2-wire mode or resistances in 4-wire mode. Before taking a
measurement, allow for at least 5 ms for internal circuits to settle after
making changes.
00 = Voltage mode
01 = 4-wire resistance mode
10 = 2-wire resistance mode
11 = Invalid state
Note: These bits are only utilized by Channels 0 – 3. These bits are
unused by Channels 4 and 5.
D7 – D5 ATTN-GAIN1-GAIN0
Attenuation and Gain Setting - Valid attenuation settings are x1 and
x10. Valid gain settings are 1, 2, 5, and 10. Note that there is only one
current source shared among all four channels, therefore, only one
resistance measurement can be made at any one time. Before taking a
measurement, allow for at least 5 ms for internal circuits to settle after
making changes.
VOLTAGE MODE (for channels 0-3)
011 = 1.0 V
010 = 2.0 V
001 = 5.0 V
000 = 10.0 V
110 = 20.0 V
101 = 50.0 V
100 = Invalid state
111 = Invalid state
VOLTAGE MODE (for channels 4-5)
011 = 0.5 V
001 = 1.0 V
000 = 2.0 V
111 = 5.0 V
101 = 10.0 V
100 = 20.0 V
010 = Invalid state
110 = Invalid state
RESISTANCE MODE (Valid for channels 0-3)
011 = 100 Ω; 2 mA current source setting
000 = 1 kΩ; 2 mA current source setting
000 = 10 kΩ; 200 μA current source setting
000 = 100 kΩ; 20 μA current source setting
000 = 1 MΩ; 2 μA current source setting