Chapter 4 Making Measurements 83
OUTPUT 722;"TARM AUTO”
!Resumes readings suspended by TARM HOLD, PRESET FAST, or PRESET DIG
or
OUTPUT 722; "TRIG AUTO"
!Resumes readings suspended by TRIG HOLD or PRESET NORM
Making Single
Readings
The NRDGS command specifies the number of readings made per trigger
event and the sample event that initiates each reading. In the power-on,
RESET, PRESET NORM, or PRESET FAST state, the number of readings
per trigger is set to 1 and the sample event is AUTO (NRDGS 1,AUTO). In
any of these states, you can initiate a single reading by executing the TARM
SGL or TRIG SGL command (depending on which event, if any, is
suspending readings). For example, the following program resets the
multimeter and suspends readings by setting the trigger arm event to HOLD.
The configuration is changed (lines 30-50) and line 60 initiates a single
reading, which is transferred to the controller and displayed. After the single
reading, the trigger arm event becomes HOLD, which suspends readings.
10 OUTPUT 722;"RESET" !RESET, ALL TRIGGERING EVENTS AUTO
20 OUTPUT 722;"TARM HOLD" !SUSPEND READINGS
30 OUTPUT 722;"DCV 10" !DC VOLTAGE, 10V RANGE
40 OUTPUT 722;"NPLC 1" !1 PLC INTEGRATION TIME
50 OUTPUT 722;"AZERO OFF" !AUTOZERO OFF
60 OUTPUT 722;"TARM SGL" !TRIGGER 1 READING
70 ENTER 722;A !ENTER READING
80 PRINT A !PRINT READING
90 END
In the PRESET NORM state, readings are suspended because the trigger
event is set to SYN (the SYN event is discussed later in this chapter). In this
state, you can initiate a single reading using the TRIG SGL command. For
example, in the following program, line 10 suspends readings by setting the
trigger event to SYN. Line 20 initiates a single reading and the reading is
transferred to the controller and displayed. Following execution of the TRIG
SGL command, the trigger event becomes HOLD which suspends readings.
10 OUTPUT 722;"PRESET NORM" !TARM AUTO, TRIG SYN, NRDGS 1,AUTO
20 OUTPUT 722;"TRIG SGL" !GENERATE SINGLE TRIGGER
30 ENTER 722;A !ENTER READING
40 PRINT A !PRINT READING
50 END
Making Multiple
Readings
You can use the NRDGS command to specify more than one reading per
trigger event. For example, the following program takes 10 readings per
trigger event (one reading is taken per sample event) and transfers them to
the controller. Notice that the input buffer is enabled (line 40). This is
because, with the input buffer disabled, the SGL event (line 60) holds the
GPIB bus until all specified readings are complete. This would prevent line
70 from transferring all but the last reading to the controller. Enabling the
input buffer prevents the TRlG SGL command from holding the bus and
allows each reading to be transferred as it becomes available.
10 OPTION BASE 1 !COMPUTER ARRAY NUMBERING STARTS AT 1
20 DIM Rdgs(lO) !DIMENSION ARRAY FOR 10 READINGS
30 OUTPUT 722;"PRESET NORM" !TARM AUTO, TRIG SYN, DCV AUTORANGE
40 OUTPUT 722;"INBUF ON" !ENABLE INPUT BUFFER
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