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Using This Chapter
Multiplexer Module Description
General Description
Multiplexer
Channel
Descriptions and
Connections
Chapter 1
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This chapter describes the HP E1343A 16-Channel High Voltage Relay,
E1344A 16-Channel General Purpose Thermocouple High Voltage Relay,
E1345A 16-Channel Relay, and HP E1347A 16-Channel Thermocouple
Relay Multiplexer Modules, and shows how to program the modules using
SCPI commands (Standard Commands for Programmable Instruments).
This chapter contains the following sections:
•
Multiplexer Module Description. . . . . . . . . . . . . . . . . . . . . . page 11
•
Programming the Multiplexer Module . . . . . . . . . . . . . . . . . page 14
•
Initial Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 17
Refer to
Figure 1-1
for the following explanations of all four 16-Channel
Relay Multiplexer Modules.
The multiplexer module switches (multiplexes) up to 16 channels. Each
channel provides High (H), Low (L), and Guard (G) connections.
The multiplexer module consists of a component assembly and a terminal
module. The channel relay switches are on the component assembly. The
field wiring from user sources (e.g., thermocouples) connects to the terminal
module. The terminal module also provides connections for multimeters,
voltmeters, counters, and other measuring devices.
The channel relay switches are separated into two banks, Bank 0 and
Bank 1. Channels 00 to 07 are in Bank 0 and channels 08 to 15 are in
Bank 1. Each bank has its own H, L, and G Common terminals to which the
channel switches connect.
The channel switches also connect, through the AT and BT Tree Switches,
to the AT and BT Tree Switch Terminals, respectively. The Bank 0 channels
connect to the AT Tree Switch Terminals and the Bank 1 channels connect
to the BT Tree Switch Terminals. An additional tree switch, the AT2 Tree
Switch, provides connection of the Bank 1 channels to AT Tree Switch
Terminals. Use channel numbers 90, 91, and 92 to select the AT, BT, and
AT2 Tree Switches, respectively.
Connecting to the Tree Switch Terminals is the preferred method to connect
measuring devices, like multimeters, to measure the multiplexer channels.
This allows you to connect the measuring device to either the Bank 0 or
Bank 1 channels at any given time, or to the channels of both banks.
Chapter 1
Getting Started
Getting Started
11
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