STB8827
Series Operation Manual Chapter 3 Introduction to [MEAS]
26
as EXT.
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 mV
rms
to 1 V
rms
The range of constant current: 100 µA
rms
to 10 mA
rms
———————————————————————————————————————
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.
Operation steps for setting auto level control function
Execute the following steps and set the constant level function as ON or OFF.
1) Move the cursor to
ALC
zone, the following soft keys are displayed.
ON
OFF
2) Press
ON
to turn on the auto level control function.
3) Press
OFF
to turn off the auto level control function.
3.5.3 Bias current isolation function
Bias current isolation function can prevent the DC current from affecting the test
input circuit. In
ISO
zone, users can set the bias current isolation function as ON
or OFF. When the bias current isolation function is set as ON, the bias current
flowing through DUT can reach 100mA. When the bias current isolation function
is set as OFF, the bias current value allowed to flow through DUT is shown as
figure 3-1, if the bias current flowing through DUT is over the value in figure 3-1,
