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Using a Multiplexer

with the Multimeter

Figure C-8 shows an example timing sequence between closing a multiplexer

channel and triggering the multimeter.

Comments

• The registers used are:

– multiplexer Status Register (base + 0

)

– multimeter Status Register (base + 04

)

– multiplexer/multimeter Command Register (base + 08

)

• The multiplexer Status Register is monitored to determine when a

channel can be closed (or opened), and when a channel has finished

closing (or opening).

• Multimeter status bit 0 is monitored to determine when a trigger

opcode can be written to the Command Register (the flowchart

assumes the multimeter is already configured).

• Multimeter status bit 5 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.

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

(see “The Status Register” on page 206).

Figure C-8. Using a Multiplexer with the Multimeter

216 HP E1326B/E1411B Multimeter Register-Based Programming Appendix C

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Agilent Technologies E1326B Bedienungsanleitung Seite 215