4.
Verify
DA
and
AD
when
the
maximum
voltage
is
up
to
90V:
Method:
set
the
power
supply
to
100V
and
the
maximum
current
output
to
1A.
Set
the
multimeter
to
the
voltage
range.
Combine
the
power
supply
and
the
multimeter
into
the
load
interface
at
the
same
time.
Turn
on
ON/OFF
switch
and
adjust
the
knob
to
make
the
voltage
on
the
multimeter
display
90V.
And
press
the
left
and
right
keys
to
adjust
the
increased
and
reduced
value.
Then
press
ENTER
to
enter
the
next
check,
or
press
ESC
to
return
to
the
previous
check.
5.
Check
the
zero
point
of
DA
low
current:
Method:
set
the
power
supply
to
5V
and
the
maximum
current
output
to
1A.
Set
the
multimeter
to
the
current
range.
Connect
the
power
supply
and
the
multimeter
to
the
load
interface.
Turn
on
the
ON/OFF
switch
and
adjust
the
knob
to
make
the
multimeter
current
display
between
1mA
and
2mA.
And
press
the
left
and
right
keys
to
adjust
the
increased
and
reduced
value.
Then
press
ENTER
to
enter
the
next
check,
or
press
ESC
to
return
to
the
previous
check.
6.
Check
the
zero
point
of
DA
high
current:
Method:
set
the
power
supply
to
5V
and
the
maximum
current
output
to
1A.
Set
the
multimeter
to
the
current
range.
Connect
the
power
supply
and
the
multimeter
to
the
load
interface.
Turn
on
ON/OFF
switch
and
adjust
the
knob
to
make
the
current
on
the
multimeter
display
between
1mA
and
2mA.
And
press
the
left
and
right
keys
to
adjust
the
increased
and
reduced
value.
Then
press
ENTER
to
enter
the
next
check,
or
press
ESC
to
return
to
the
previous
check.
7.
Verify
DA
and
AD
when
the
maximum
value
of
the
current
low
gear
is
3A:
Method:
set
the
power
supply
to
5V
and
the
maximum
current
output
to
5A,
set
the
multimeter
to
the
current
range,
connect
the
power
supply
and
the
multimeter
to
the
load
interface,
turn
on
the
ON/OFF
switch,
and
adjust
the
knob
to
make
the
current
on
the
multimeter
display
3A.
And
press
the
left
and
right
keys
to
adjust
the
increased
and
reduced
value.
Then
press
ENTER
to
enter
the
next
check,
or
press
ESC
to
return
to
the
previous
check.
8.
Verify
DA
and
AD
when
the
maximum
value
of
the
current
low
gear
is
9.9A:
Method:
set
the
power
supply
to
5A
and
the
maximum
output
to
11A,
set
the
multimeter
to
the
current
range,
connect
the
power
supply
and
the
multimeter
to
the
load
interface,
turn
on
the
ON/OFF
switch,
and
adjust
the
knob
to
make
the
current
on
the
multimeter
display
9.9A.
You
can
press
the
left
and
right
keys
to
increase
or
decrease.
Then
press
ENTER
to
save
and
complete
the
verification,
or
press
ESC
to
return
to
the
previous
verification.
