BK Precision 4070A User Manual Rev.2.2
62
ARB.BAS
ARB.BAS is a program written in Microsoft Quick Basic, which calculates the points of a sinewave and
downloads them to the 4070A as an arbitrary waveform. The program can generate the waveform in all of the
supported formats (Floating Point, Integer, Hexadecimal, and Binary) and shows how SYNC Out can be asserted
during waveform points.
This program can serve as a good starting point for writing you own waveform generation programs. You can
replace the sin(x) function with your own mathematical function and pick which data format you wish to use by
calling the appropriate subroutine. (Binary format is the most efficient since it requires the least amount of bytes per
data point, and can therefore be downloaded faster).
A complete listing of ARB.BAS begins on the following page. The source file for this program can also be found
on the accompanying compact disk.
Program Listing - ARB.BAS
'******************************************************************************
'* BK Precision Model 4070A *
'* *
'* Arbitrary Waveform Data Generator Example *
'* *
'******************************************************************************
' Program Description
' This program generates a sinewave and downloads the data points to the
' 4070A for generation with the Arbitrary Waveform Generator.
' It can generate the data in a variety of different number formats.
' Each format has its own subroutine below.
' ------- Open the serial port for communication with the 4070A ------------
' Ask the user which serial port is attached to the 4070A
INPUT "Is the 4070A on Com port 1 or 2? (1/2) >"; a$
' Open Com port, Disable CD,CTS,DCD, give 5 sec max. to open,
' Set Rx buffer to 2K, Disable RTS, set Tx buff to 1K, Random = i/o,
' Set random access buffer size to 2K
IF a$ = "1" THEN
OPEN "COM1:9600,n,8,1,CD0,CS0,DS0,OP5000,RB2048,RS,TB1024" FOR RANDOM AS #1 LEN = 2048
GOTO EndPortSel
END IF
IF a$ = "2" THEN
OPEN "COM2:9600,n,8,1,CD0,CS0,DS0,OP5000,RB2048,RS,TB1024" FOR RANDOM AS #1 LEN = 2048
GOTO EndPortSel
END IF
GOTO ArbExit ' Abort program if neither Com1 nor Com2 was selected
EndPortSel:
' ---- Command the 4070A to enter Arbitrary Waveform Generation Mode -------
' Note: The 4070A does not need to be in Arbitrary Waveform generation mode
' to accept data points over the serial port. We switch to Arbitrary
' waveform mode here as an example of remotely controlling the operation
' of the unit, and to have the waveform generated after the download.
' For more information on Remote Control, See the 4070A User’s Manual
' Put the 4070A in Arbitrary Waveform mode, set parameters
PRINT #1, "G F11 F240Z F35Y" ' G = Set Arbitrary Mode
' F11 = Set Continuous (not Triggered) mode
' F240Z = Set sampling clock to 40 MHz
' F35Y = Set output level to 5V p-p