User`s manual

Making an Externally Triggered Burst of Measurements

This program makes a burst of 10 measurements on the faceplate terminals

when the multimeter receives an external trigger.

10 !Dimension a computer array to store the readings.

20 DIM Rdgs(1:10)

30 !

Clear and reset the multimeter.

40 CLEAR 70903

50 OUTPUT 70903;"*RST"

60 !

Configure the multimeter for DC voltage measurements. Set the trigger

70 !source to an external trigger. Take a burst of 10 readings when the trigger

80 !occurs. Wait for the trigger then return the readings to the output buffer.

90 OUTPUT 70903;"CONF:VOLT:DC"

100 OUTPUT 70903;" TRIG:SOUR EXT"

110 OUTPUT 70903;" SAMP:COUN 10"

120 OUTPUT 70903;"READ?"

130 !

Enter and display the readings on the computer.

140 ENTER 70903;Rdgs(*)

150 FOR

I=1 TO 10

160 PRINT Rdgs(

170 NEXT

180 END

Comments

• The multimeter is triggered when a high-to-low TTL signal is

applied to the "External Trigger" port.

• CONFigure sets the trigger source to the multimeter’s internal

trigger. The trigger source is changed with the

TRIGger:SOURce

command. The sources available are:

IMM - immediate (internal) trigger

EXT - external trigger

BUS - triggered by *TRG or HP-IB group execute trigger

HOLD - suspend trigger

• CONFigure sets a burst consisting of one measurement. The

SAMPle:COUNt command is used to set a burst of measurements

greater than one. Up to 16,777,215 measurements can be specified

with

SAMPle:COUNt.

• The multimeter output buffer can hold eight readings. When the

buffer fills, measurements are suspended until readings are read from

the buffer (by the computer) to make space available.

44 Using the HP E1326B/E1411B Multimeter Chapter 3