Scientific SM6026, Руководство пользователя

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User Manual SM6026 27
 Deviation Test Mode B (DEV B)
 Deviation Test Reference Value A (REF A)
 Deviation Test Reference Value B (REF B)
Some zones listed below are as same as that on <MEAS DISP> page, so it is not necessary to introduce
in this section, but others will be introduced briefly in the following sections.
 Test function (FUNC)
 Test frequency (FREQ)
 Test level (LEVEL)

Test range (RANGE)
 Test speed (SPEED)
 DC Bias (DC BIAS)
 DC Voltage Source (DC SRC)
3.5.1 Trigger mode
There are 4 trigger modes on SM6026 : INT, MAN, EXT and BUS.
When the trigger mode is set as INT, SM6026
will make sequential and repeated tests. When the
trigger mode is set as MAN, press [TRIGGER] once, SM6026 will make one test. When the trigger
mode is set as EXT, once the HANDLER interface receives a positive impulse, SM6026 will execute
one measurement. When the trigger mode is set as BUS, once the IEEE 488 interface receives a
TRIGGER command, SM6026 will execute a test. The BUS mode cannot be set on the front panel.
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Note : In the process of testing, when SM6026 receives a trigger signal, it will be ignored. So the trigger
signal should be sent after the test is done. When optional HANDLER interface triggers SM6026 , the
trigger mode is set as EXT.
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Operation steps for the trigger mode setup
Execute the operation of other trigger modes except BUS trigger. If BUS trigger mode is necessary, then
use IEEE4888 interface to send
TRIGger:SOURce BUS command.
1) Move the cursor to the TRIGGER zone, the following soft keys will be displayed :

INT
 MAN
 EXT
2) Use above soft keys to set the trigger mode.
3.5.2 Auto level control function
Auto level control function can adjust the real test level (voltage across or current through DUT) to the
test level value. This function can guarantee the test voltage or current being constant. When using this
function, the test level can be set within the range below:
The range of constant voltage: 10 mVrms to 1 Vrms
The range of constant current: 100 μArms to 10 mArms
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NOTE: When the constant level function is valid, if the level exceeds above ranges, this function will be
automatically set as OFF. The level value currently set is generally deemed as non-constant level value.
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