HP FET MULTIPLEXER E1351A/53A Comments

Comments Isolation. The direct terminals provide a more accurate measurement than the tree terminals or the analog bus connector as the signal does not have to travel through the extra FET switches. The SCAN:PORT NONE command opens the tree isolation switches and isolates the direct terminals from the tree terminals and the analog bus connector.

The default value of SCAN:PORT is NONE for reset and power-on. If you have not specified a different SCAN:PORT since reset or power-on, you do not need to execute this command. You can also use the direct terminals with SCAN:PORT ABUS. The signal for a given closed channel will then be available at the direct terminal for that bank, the A tree terminal and the analog bus connector.

Closing Channels. The FET multiplexer module only allows one channel per card to be closed at a time, except for SCAN:MODE FRES (4-wire resistance measurements) where two channels are closed. You can close a channel on two different cards in the same instrument at the same time.

The SCAN <channel_list> command allows you to specify a list of channels to be closed sequentially. The FET multiplexer module uses a break-before-make procedure, so closed channels are opened before the next one on the list is closed. The channels are advanced according to the TRIGger mode selected.

Query Open/Closed Channels. The CLOSe? <channel_list> and OPEN? <channel_list> commands determine if the channel(s) in the channel list are open or closed, respectively. (The query command does not determine if, in the event of a hardware failure, the channel remains open/closed.) For example, to determine if channel 109 is closed, execute:

CLOS? (@109)

A response of "1" indicates the channel is closed, and a "0" indicates the channel is open. The reverse is true for the OPEN? <channel_list> command. The response for the OPEN? and CLOSe? commands are:

CLOS?	1	= Closed
	0	= Open
OPEN?	1 = Open
	0	= Closed

To find out which channel on a card is closed, use a channel list for the card.

CLOS? (@100:115)

and enter the response into a string variable. If channel 09 is closed, the response will be:

0,0,0,0,0,0,0,0,0,1,0,0,0,0,0,0

NOTE: You must read the response after sending a query command or the switchbox will generate an error.

Chapter 3

Using the HP E1351A/53A FET Multiplexer Modules 33

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