Appendix D Optimizing Throughout and Reading Rate 337
be:
OUTPUT 722 USING "#,K"; "CALL 1"
By using the image "#,K", the End-Of-Line (EOL) terminators are suppressed.
When the 3458A receives the command without a terminator, it releases the
computer so that the computer can continue the program while the 3458A
continues with the operations it was requested to do. Note that the execution time
for the benchmark is markedly less than just using Reading Memory.
Display Off: (Subprogram Display)
test execution time = .500 s
program memory download time = .280 s
reading transfer time = .180 s
2250 SUB Disp(REAL Dnld_time,Exe_time,Tns_time)
2260 DIM A(37)
2270 Dnld_time=TIMEDATE
2280 OUTPUT 722;"PRESET;MFORMAT SREAL;DISP OFF,TESTING"
2290 OUTPUT 722;"SUB 1;MEM FIFO;OHM,1E4;NPLC 0;DELAY 0;NRDGS 15;TRIG SGL"
2300 OUTPUT 722;"OHM,1E5;NRDGS 8;TRIG SGL"
2310 OUTPUT 722;"OHMF,1E3;APER 20E-6;DELAY -1 ;NRDGS 2;TRIG SGL"
...
This is the same program as the Subprogram Program, but the display is turned
off. The test execution time is cut in half.
Azero Off: (Subprogram Azero)
test execution time = .510 s
program memory download time = .280 s
reading transfer time = .180 s
This is the same program as the Subprogram Display, but Auto Zero is turned off.
There is no real advantage in test of this type because the reading speed is so fast
that there really isn't much difference between leaving auto Zero on or off. In some
cases it may be faster when changing function or integration time to leave Auto
Zero On.
Defeat On: (Subprogram Defeat)
test execution time = .470 s
program memory download time = .280 s
reading transfer time = .180 s
2690 SUB Defeat(REAL Dnld_time,Exe_time,Tns_time)
2700 DIM A(37)
2710 Dnld_time=TIMEDATE
2720 OUTPUT 722;"PRESET;DISP OFF,TESTING;MFORMAT SREAL;DEFEAT ON"
2730 OUTPUT 722;"SUB 1;MEM FIFO;OHM,1E4;NPLC 0;DELAY 0;NRDGS 15;TRIG SGL"
2740 OUTPUT 722;"OHM,1E5;NRDGS 8;TRIG SGL"
This is the same program as the Subprogram Display, but the DEFEAT function
is turned on. In this mode of operation, some of the overload detection and
protection circuitry is defeated. If a voltage of greater than 300 V is detected, the
defeat feature is turned off and the event is noted in the 3458A's memory. This
feature allows faster function and range changes but should not be, as a matter of
practice, abused.
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