VXI SVM2608 user manual Microprocessor Commands, Measurement Commands

www.vxitech.com

MICROPROCESSOR COMMANDS

Unless otherwise specified, commands are issued to each channel’s command register. After issuing a command, the user must wait until the command is executed before issuing a new command to the same channel. The module sets the Command Register to all zeros when a command is finished executing. Issuing a new command before a command completes will yield unpredictable results and may place the board into an unknown state. It is acceptable, however, to issue a command to a different channel without waiting for the current channel to finish execution.

Measurement Commands

The following is a list of the measurement commands:

NOTE	The currents generated by the current sources are listed here for REFERENCE only. The board is
	not designed to be a precision current source. These current sources are used for resistance
	measurements, but all the calculations are adjusted to the internally calibrated values.
	0x0001	= Peak Voltage Calculation
	0x0002	= DC Voltage Calculation
	0x0003	= RMS Voltage Calculation
	0x0004	= Peak-to-Peak Voltage Calculation
	0x0005	= 100 Ω Range Resistance Measurement (2-wire)
	0x0006	= 1 kΩ Range Resistance Measurement (2-wire)
	0x0007	= 10 kΩ Range Resistance Measurement (2-wire)
	0x0008	= 100 kΩ Range Resistance Measurement (2-wire)
	0x0009	= 1 MΩ Range Resistance Measurement (2-wire)

0x000A = Auto-range Resistance Measurement (2-wire)

0x000B = 100 Ω Range Resistance Measurement (4-wire)

0x000C = 1 kΩ Range Resistance Measurement (4-wire)

0x000D = 10 kΩ Range Resistance Measurement (4-wire)

0x000E = 100 kΩ Range Resistance Measurement (4-wire)

0x000F = 1 MΩ Range Resistance Measurement (4-wire)

0x0010 = Auto-Range Resistance Measurement (4-wire)

0x0011 = Perform Self-Test

0x0012 = 1 V Range Voltage Measurement

0x0013 = 2 V Range Voltage Measurement

0x0014 = 5 V Range Voltage Measurement

0x0015 = 10 V Range Voltage Measurement

0x0016 = 20 V Range Voltage Measurement

0x0017 = 50 V Range Voltage Measurement (for Channels 0-3 Only)

0x0019 = Auto Range Voltage Measurement 0x001A = Minimum Voltage Calculation 0x001B = Resistance Calculation

0x001C = Set current source for 100 Ω / 1 kΩ measurement (≈ 2 mA) 0x001D = Set current source for 10 kΩ measurement (≈ 0.2 mA) 0x001E = Set current source for 100 kΩ measurement (≈ 0.02 mA) 0x001F = Set current source for 1 MΩ measurement (≈ 0.002 mA)

0x0020 = Correct setup with calibrations (set offset & gain DACs and calibrated trigger levels based on calibration values)

0x0021 = 0.5 V Range Voltage Measurement (for Channels 4-5 Only)

SVM2608 Programming 41