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HP FET MULTIPLEXER E1351A/53A Register-BasedProgramming for Maximum Speed

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Register-Based Programming for Maximum Speed

This is an outline of the algorithm that needs to be followed to have the HP E1326B 51⁄2 Digit Multimeter do high-speed scanning using the HP E1351A 16-Channel FET Multiplexer. This procedure programs the multimeter and downloads a scan list to the FET multiplexer so the hardware controls the entire scanning process. The HP E1326B has several things that should be understood when doing register programming.

1.Table B-1 on page 96 lists the multimeter’s commands. When doing any of these commands, you are writing to registers which are read by the multimeter’s voltmeter microprocessor. It is important to follow the procedure in Figure B-3 on page 97 on how to send commands. This will enable you to handshake with the E1326B microprocessor as you can easily write commands faster than the processor can execute them.

2.In order to program the HP E1326B Multimeter to take readings with the HP E1351A FET Multiplexer at its highest speed, do the commands from Table B-1 on page 96. Note that all values in Table B-1 are specified in decimal.

set the function	dcv
set the range	1V

Note: You must have a fixed range to do 13k. Auto range will do 2.5k.

set the aperture10 μsec

Note: This will cause readings to be returned as 16 bits.

set the auto zero	off or once
set offset Compensation	off
set trigger source	Immediate
set trigger count	1
set trigger delay	0
set Sample Count	16

This should be the total number of A/D readings that you will take (for example, once through a 16 channel list = 16, 10 times through a 16 channel list = 160).

set sample Source	Timer
This is the time between A/D readings.
set sample Period	76μs

76 μsec is the minimum or fastest A/D time.

set trigger arm

armed

This arms the DVM to take all of the reading specified above.

Do not execute the next command yet. You still need to set the scan list in the HP E1351A. Trigger immediate will start everything.

3.Now download the channel list to the HP E1351A

∙Set CLR SCN in Scan Control Register to one, then back to zero in order to clear the previous scan list.

∙DIR in the Status/Control Register set to false.

Appendix B

HP E1351A/53A Register-Based Programming 93

Contents

Contents Page Page Page Page Page July 20 Page Reader Comment Sheet BUSINESS REPLY MAIL HEWLETT-PACKARDCOMPANY Page Getting Started with the HP E1351A/53A Using This Chapter FET Multiplexer Module Description Multimeter Connection Points Analog Bus Connector Page Switchbox and Scanning Voltmeter Configurations Digital Bus and Triggering Programming Language Initial Operation Configuring the HP E1351A/53A FET Multiplexer Modules Warnings and Cautions Multiplexer Card Numbers Setting the Address Switch Selecting the Interrupt Line Number Setting the Card ID Switch Connecting User Inputs Adding Signal Conditioning Components/Current Shunts Connecting Field Wiring Wiring a Terminal Module Connecting Multimeters and Signal Generators Analog Bus and Digital Bus Cables Page Using the HP E1351A/53A FET Multiplexer Modules Selecting Channels Page Multiplexer Commands Connecting Switchbox Channels to Direct Terminals Comments Connecting Switchbox Channels to Tree Terminals for Making Measurements Page Scanning a Range of Switchbox Channels Page Example: Making 2-WireOhms Measurements by Scanning Example: Making 4-WireOhms Measurements by Scanning Downloading a Scan List Scanning a Switchbox without a Downloaded Scan List Scanning a Switchbox with a Downloaded Scan List Scanning Voltmeter Configuration with HP E1326B Measuring Temperature Using Thermocouples (HP E1353A Module only) Comments Understanding the HP E1351A/53A FET Multiplexer Modules Commands for Scanning Switchbox Channels Using Scanning Trigger Sources Page Page Example: Scanning with External Instruments Using "Trig Out" and "Event In" Ports Using Stand-Alone Multimeter and Digital Bus Triggering Using Scanning Voltmeter Configuration and Digital Bus Triggering Using the Scan Complete Bit HP E1351A/53A 16-ChannelFET Multiplexer Command Reference Command Types Common Command Format SCPI Command Format Command Separator Abbreviated Commands Implied Commands Note SCPI Command Reference ABORt ARM DISPlay :MONitor:CARD :MONitor[:STATe] Monitoring Switchbox Channels: Selecting the Module to be Monitored: Monitor Mode on an HP 1301 Mainframe Display: Example Enabling the Monitor Mode INITiate Example Enabling Continuous Scans :CONTinuous Example Query Continuous Scanning State Starting the Scanning Cycle: ∙Stopping Scanning Cycles: See the ABORt command OUTPut [ROUTe:] Example Closing Multiplexer Channels CLOSe ∙ Query is Software Readback: The [ROUTe:]CLOSe? command Example Query Multiplexer Channel Closure OPEN Opening Multiplexer Channels OPEN ∙ Query is Software Readback: The [ROUTe:]OPEN? command Query Multiplexer Channel Open State SCAN ∙Scanning Operation: With a valid channel list Stopping Scan: Example Scanning Using External Instruments SCAN:MODE Order of Command Execution: Mode Description: Selecting the 4-Wire SCAN:MODE Example Query Scan Mode SCAN:PORT port Example Selecting the ABUS Port SCAN:PORT Example Query Scan Port SETTling[:TIME] Digital Bus Handshaking: Example Setting 16 μsec SETTling TIME SETTling[:TIME] Example Set and Query the SETTling TIME STATus :OPERation:ENABle SYSTem :CDEScription :CTYPe :ERRor TRIGger :SOURce ∙ Enabling the Trigger Source: The TRIGger:SOURce command Using the Using Digital Bus Trigger: Using External Trigger Inputs: Example Scanning Using External Triggers Scanning Using Bus Triggers :SOURce Example Query Trigger Source IEEE 488.2 Common Commands Command Quick Reference Page HP E1351A/53A FET Multiplexer Specifications Page HP E1351A/53A Register-Based Programming About This Appendix Register Addressing Page The Base Address A16 Address Space Outside the Command Module or Mainframe Register Descriptions Page Register Bit Descriptions Manufacturer ID Register Status/Control Register Scan Control Register Scan Channel Delay Register Scan Channel Configuration Register Configuration Bit (C1 - C0) Executing Commands OUTPut [ROUTe:] SYSTem TRIGger Register-BasedProgramming for Maximum Speed VLD A_D B_D decimal code: Page Multimeter Command and Parameter Opcodes Page Register-Based Programming Error Codes HP E1351A/53A FET Multiplexer Error Messages Page Index