Increasing The Reading Rate; High-Speed Mode - Agilent Technologies 3458A User Manual

10 OPTION BASE 1
20 Num_readings=20
30 ALLOCATE REAL Rdgs(l:Num_readings)
40 ASSIGN @Dvm TO 722
50 OUTPUT @Dvm;"PRESET NORM;OFORMAT DREAL;NPLC 10;NRDGS";Num_readings
55 !TRIG SYN, DCV AUTORANGE, DREAL OUTPUT FORMAT, 10 PLC, 20 READINGS/TRIG
60 ASSIGN @Dvm;FORMAT OFF
70 FOR I=1 TO Num_readings
80 ENTER @Dvm;Rdgs(I)
90 IF ABS(Rdgs(I))=l.E+38 THEN
100PRINT "OVERLOAD OCCURRED"
110ELSE
120Rdgs(I)=DROUND(Rdgs(1),8)
130PRINT Rdgs(I)
140END IF
150NEXT I
160END

Increasing the Reading Rate

High-Speed Mode

1. Refer to chapter 5 for more information on direct- and sub-sampled measurements.
102 Chapter 4 Making Measurements
readings to the computer using the DREAL format. The ENTER statement
is easier to use since no I/O path is necessary but is much slower than the
TRANSFER statement. Also when using the ENTER statement, you must
use the FORMAT OFF command to instruct the controller to use its internal
data structure instead of ASCII.
This section discusses the multimeter's high-speed mode and the factors that
affect the reading rate. It contains program examples that show how to
increase the reading rate, how to transfer readings at high-speed directly to
the controller, how to perform high-speed transfers from reading memory to
the controller, and how to determine the reading rate.
For DC voltage, DC current, 2- or 4-wire ohms, and direct- or sub-sampled
1
measurements, the multimeter enters the high-speed mode when readings
are initiated, the integration time is less than 10 PLCs, and the following
commands have been executed:
ARANGE OFF
DISP OFF
MATH OFF
MFORMAT SINT or DINT (only required when reading memory is enabled)
OFORMAT SINT or DINT (only required when reading memory is not enabled)
While readings are being taken in the high-speed mode, the multimeter
becomes completely dedicated to the measurement process. This means that
it will not process any commands until the specified readings are completed.
When readings are being sent directly to the output buffer in the high-speed
mode, the multimeter waits until each reading is removed from the output
buffer before placing the next reading in the output buffer. This ensures that
readings will not be lost because of bus/controller speed limitations. (When
not in the high-speed mode, the multimeter will write-over any reading in
!COMPUTER ARRAY NUMBERING STARTS AT
!NUMBER OF READINGS = 20
!CREATE ARRAY FOR READINGS
!ASSIGN MULTIMETER ADDRESS
!USE 8-BYTE/WORD DATA STRUCTURE
!ENTER EACH READING
!IF OVERLOAD OCCURRED:
!PRINT OVERLOAD MESSAGE
!IF NO OVERLOAD OCCURRED
!ROUND READINGS TO 8 DIGITS
!PRINT READINGS