The Common Terminals also connect to the H, L, and G connections on the
Analog Bus Connector. The DT Tree Switch Terminals also connect to the
I+, I-, and IG connections on the Analog Bus Connector. The Analog Bus
Connector provides direct channel connections between multiple
multiplexer modules, and connections between a multiplexer module and
the HP E1326/
E1411 Multimeter. Cables make the necessary connections without the
need to externally wire the multimeter/multiplexer module to the terminal
module.
Each Common and DT Tree Switch lines have a 100
Ω
resistor in series
with each line. The resistors provide relay protection and are located on the
component module. The Analog Bus lines have jumpers in series that you
may remove to isolate the analog bus from the multiplexer module. The
Low (L) and Guard (G) commons are normally connected to each other
through isolation jumper JM1 (see Chapter 2). Remove the jumper to
minimize errors caused by lead resistance in the low lines. The jumper is
located on the component assembly.
Programming the Multiplexer Module
The multiplexer module is programmed either in a switchbox or scanning
voltmeter configuration. To program the multiplexer module using Standard
Commands for Programmable Instruments (SCPI), you must select the
controller language, interface address, and SCPI commands to be used. See
the "HP 75000 Series B Installation and Getting Started Guide" or the "HP
E1405/E1406 Command Module Manual" for interface addressing and
controller language information of multiplexer modules in a switchbox or
scanning voltmeter configuration.
Note
This discussion applies to SCPI programming. See Appendix B
(48-Channel Relay Multiplexer Registers) for details on multiplexer module
registers.
Selecting Channels
To address specific channels within a multiplexer module in a switchbox or
scanning voltmeter configuration, you must:
•
send the appropriate SCPI command string to the switchbox or
scanning voltmeter (e.g., CLOSe, OPEN, etc.)
•
specify the card number
•
specify the channel number
Chapter 1
Getting Started with the HP E1346A 13
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