Agilent-technologies E1300B Manual do Utilizador descarregar pdf (Página 92)

Example: Synchronizing an Internal Instrument to an External Instrument

This example uses the mainframe’s Trig Out and Event In ports to synchronize

an external multimeter to a multiplexer installed in the mainframe. Connections

are shown in Figure 4-3. The multimeter’s Voltmeter Complete port outputs a

pulse whenever the multimeter has finished a reading. The multimeter’s

External Trigger port allows the multimeter to be triggered by a negative going

TTL pulse. Since the synchronization is independent of the GPIB bus and the

computer, readings must be stored in the multimeter’s reading memory. The

sequence of operation is:

1. INIT (line 50) closes channel number 100.

2. The channel closure causes a pulse on Trig Out which triggers the

multimeter to take a reading.

3. When the reading is complete it is stored in multimeter memory and the

multimeter outputs a pulse on its Voltmeter Complete port. This signals

the multiplexer to advance to the next channel in the scan list.

4. Steps 2 and 3 are repeated until all channels have been scanned and

readings taken.

10 OUTPUT 722;"TRIG EXT;DCV;MEM FIFO"

Set multimeter to external trigger, DC volts, enable reading

memory

20 OUTPUT 70914;"OUTP ON" Enable Trig Out port

30 OUTPUT 70914;"TRIG:SOUR EXT" Set multiplexer to advance scan

on external signal

40 OUTPUT 70914;"SCAN (@100:115)" Specify scan list (channels 100

to 115)

50 OUTPUT 70914;"INIT" Close first channel (starts

scanning cycle)

60 END

Example: Synchronizing Internal/External Instruments and the Computer This

example uses the mainframe’s Trig Out port to synchronize an external

Figure 4-3. Synchronizing Internal/External Instruments

4-4 Using the Mainframe

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Agilent-technologies E1300B Manual do Utilizador Página 92