User`s manual

120 Agilent E8462A Scanning Voltmeter Application Examples Chapter 4
The analog bus provides access to all wires of the channel regardless of
being configured as a 1-, 2-, 3- or 4-wire channel. Access is through the
front panel analog bus connector which is used to connect to other
multiplexers and to the E1411 (or E1326) multimeter. Figure 4-1 is a
schematic representation of the scanning voltmeter using the E1411B
multimeter with an E8462A multiplexer. The analog bus is connected from
multiplexer to multiplexer in multiple switch module scanning voltmeter
instruments to provide a continuous bus for the instrument.
Making Measurements
The following sections provide examples for making voltage, 2-wire ohms
and 4-wire ohms with the scanning voltmeter. The multimeter (E1326/
E1411)
MEASure command is used to both specify the channel list to scan
and to make measurements.
Scanning Voltmeter
Measurement
Program
This example scans a list of multiplexer channels and makes a measurement
on each channel (this example scans 32 channels of the multiplexer). The
measured readings are entered into the computer and displayed after the
scan.
Table 4-2. Tree Relay Descriptions (controlled automatically
by the “VOLTMTR” Scanning Voltmeter Driver)
Relay
Function
Tree Relay
Channel
Designation Funfional Description
Analog Bus
Relays
9200 AB200 Connects the Voltage Sense H1 terminal of the
Analog Bus to the Terminal Bus, line Ter0.
9201 AB201 Connects the Voltage Sense L1 terminal of the
Analog Bus to the Terminal Bus, line Ter1.
9202 AB202 Connects the G terminal of the Analog Bus to the
Terminal Bus, line Ter1 or Ter2.
9203 AB203 Connects the H2 terminal of the Analog Bus to the
Terminal Bus, line Ter4.
9204 AB204 Connects the L2 terminal of the Analog Bus to the
Terminal Bus, line Ter5.