VXI SVM2608 user manual Linear/Fifo, 2WIREOHMS, 4WIREOHMS, ATTN-GAIN1-GAIN0

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Control Register (0x08, 0x30, 0x58, 0x80, 0xA8, 0xD0) — Read & Write

 

 

 

 

 

 

 

 

Linear or FIFO Memory Mode - Determines whether the data is

 

 

 

 

 

 

 

captured in Linear (burst) or FIFO (real time) acquisition mode.

 

D10

 

LINEAR/FIFO

 

0 = Linear mode

 

 

 

 

 

 

 

 

 

 

 

 

 

 

1 = FIFO mode

 

 

 

 

 

 

 

Pon state = 0

 

 

 

 

 

 

 

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.

 

 

D9 - D8

 

 

2WIREOHMS/

 

 

00 = Voltage mode

 

 

 

 

4WIREOHMS

 

 

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.

 

 

 

 

 

 

 

 

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

 

D7 – D5

 

ATTN-GAIN1-GAIN0

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

SVM2608 Programming

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Contents SVM2608 VXI Technology, Inc Table of Contents Self Test Command Restricted Rights Legend WarrantyLimitation of Warranty CertificationSteve Mauga, QA Manager EMCUse Proper Power Source Service should only be performed by qualified personnelTerms and Symbols Use Proper Power CordImproper Use Avoid Electric ShockGround the Product Operating ConditionsTechnical Support VXI Technology World HeadquartersVXI Technology Cleveland Instrument Division VXI Technology Lake Stevens Instrument DivisionVXI Technology, Inc SVM2608 Preface Overview IntroductionScale Triggering Acquiring DataPre-Trigger Linear ModeDelayed Trigger Test Bus Fifo ModeCommands CalibrationsOption SVM2608 Block Diagram Physical Description SVM2608 Environmental SpecificationsCH1I+ GND CH3I+ Exttrigin CH0I CH2I Front Panel Interface WiringGND CH1I CH3I GNDMtbf SVM2608 SpecificationsOption 1 SVM2608-01 VXI Technology, Inc SVM2608 Introduction Setting the Chassis Backplane Jumpers Calculating System Power and Cooling RequirementsRotary Switch Locations Setting the Base AddressMSB LSB ExampleDivide Decimal Module INSTALLATION/REMOVAL Switch to C and the front switch toRegister Offset Device Memory MapsFunction Offset ReservedMS = Most Significant LS = Least Significant SVM2608 A32 Register MAP0x72 Command Register Channel 0x74 Databyte Ordering Determining the Register Address Sysfailctl Accessing the RegistersDescription of Registers EXT Trig Slope Force Trigger, Start Register 0x02 Read & WriteINTLVL2 HSTRIGSRC2External Trigger Level 0x06 Read & Write TimeoutctlReserved ATTN-GAIN1-GAIN0 2WIREOHMS4WIREOHMS LINEAR/FIFOKHz Channels 0-3/5 MHz Channels 4-5 LPF Control This bit Sample Rate 0x0C, 0x34, 0x5C, 0x84 Read & WriteSample Rate 0x0E, 0x36, 0x5E, 0x86 Read & Write Sample Rate, High-Speed 0xAE, 0xD6 Read & Write Sample Rate, High-Speed 0xAC, 0xD4 Read & WriteTimeout 0x1C, 0x44, 0x6C, 0x94, 0xBC, 0xE4 Read & Write Reserved Registers 0xF8 0xFC Fifo Data 0x24, 0x4C, 0x74, 0x9C, 0xC4, 0xEC Read OnlyFifo Data 0x26, 0x4E, 0x76, 0x9E, 0xC6, 0xEE Read Only Trigger Delay = Measurement Commands Microprocessor CommandsCaptured Data Calculations Resistance Measurement Dynamic Method Self Test CommandResistance Measurement Offset Method Example Preset Setting Measurement CommandsTrigger Event Forced Trigger Calibration CommandsSample Points Sample RatePage Error Processing There are no errors in the queue Diagnostic Commands Changes become effective the next time the module powers up Examples Example 2 Setting Channel 2 to Acquire 200,000 SamplesExample 3 Setting Channel 2 to Pre-acquire 100,000 Samples Timeout Register = Timeout Base * 213 + Timeout Counter Timeout Counter = Timeout / Timeout Base ClockVXI Technology, Inc SVM2608 Programming Data Swapping Example Appendix aVXI Technology, Inc SVM2608 Appendix a Index