Agilent Technologies E8462A Manual do Utilizador descarregar pdf (Página 143)

• Multimeter status bit 5 (multimeter complete) is monitored to

determine when the analog-to-digital (A/D) conversion is in progress,

and thus, when to advance the channel. This enables each channel to

be measured before the readings are read from the buffer.The channel

can also be advanced by monitoring bit 4 (Data Ready). However,

before measuring the next channel, readings from the previous channel

must be read from the buffer in order to clear the bit.

• Multimeter Autozero is often turned on in order to detect when bit 5 is

active.

Programming Example

The example in this section demonstrate how to program the multiplexer in

• Reading the ID, Device Type, and Status Registers

• Closing/Opening a channel, Stand-Alone Multiplexer Measurements

• Scanning through channels

System

Configuration

The following programs were developed on an embedded controller using

Visual C/C++ programming language and using the SICL interface library.

You can also use an external PC connected via GPIB to an Agilent E1406A

Command Module. The command module simply provides direct access to

the VXI backplane.

Example Program The following example program contains segments that:

• Read the ID and Device Type Registers.

• Read the Status Register.

• Close a group of channels and the associated tree relay.

• Resets the module to open all channels.

• Scans through all the channels on the module.

1 2 ... 138 139 140 141 142 143 144 145 146 147 148 ... 155 156

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Agilent Technologies E8462A Manual do Utilizador Página 143