◇
41
4.4.1
Start up test
In measurement mode, after checking the test conditions and the correct
connection with DUT, press START key to start up test. After the delay set by STRT
DLY1 and STRT DLY2 in SYSTEM2, the tester will start measurement.
4.4.2
Low terminal connection test
Ground connection is used in testing device, as the low
test terminal is connected to the ground terminal (shell),
which is used to judge the reliability of ground
connection. If the low terminal connection is not reliable,
the shell of DUT takes high voltage in the process of
testing; it will cause accidental shock when touched.
Instruction:
High voltage test terminal is connected to the test
terminal of DUT.
Low test terminal is connected to the ground
connection terminal of device shell.
Ground detection terminal is connected to another
terminal of shell (screw).
Set ground connection test, test time is set by user.
Start test, instrument firstly executes ground
check: current from the ground detection output flows back to the low test
terminal as shown in the figure.
If the test circuit connection is normal within the set time (if loop resistance
is <1ohm, it is normal), the ground check is passed and test continues.
If test circuit is not available (if ground loop resistance >1ohm, it is abnormal),
the instrument will quit testing, and displays connection error (GR FAIL).
Note 1: ground connection test is enabled with GR CONT in SYSTEM1 interface.
Note 2: for test convenience, the test low-terminal and the ground detecting
terminal could be connected directly and then attached to the DUT to forcibly pass
the ground breakover test. However, this setup will bring many dangers for other
operators, because it will give them false safety messages.
4.4.3
Voltage rise
Some DUTs are voltage-sensitive, so this function is useful. The output voltage rises
from 0. The resolution of the output voltage, controlled by the instrument, varies
in every 0.1S and depends on the test voltage and the voltage rise time {ΔV = V /
(10*S)}. If the voltage rise time (RISE OFF) is turned off, the default voltage rise
time will be 0.1S.
