7. ENTERING TIP OFFSET VALUES
Soldering
tips
have
diferent
thermal
characteristics,
depending
upon
their
mass,
shape,
and
surface
area. It is obvious that the tip temperature at idle will not be the same for a fine tip as it will be for a
heavy chisel tip, although
the set temperature may be the same for each tip.
The dif ference between
the set temperature and the temperature measured at the tip is called ‘
T
ip Temperature O
f
fset’. The
offset value may be entered into the station to either add to or subtract from the set value, thus
producing the desired tip temperature.
The Hakko 942 has the ability to electronically compensate for the variations due to tip temperature
offset. When a soldering tip is changed, the proper o
f
fset temperature value should be programmed
into the 942.
1. Insert the control card into the slot in the
station.
• The station will default to the temperature
setting mode. Set the temperature at
400
°
C (750
°
F).
2. Press the
button on the front panel
and hold for one second.
• This will set the station to the data entry
mode. The
existing
o
f
fset
will
be
displayed.
3. Measure the tip temperature.
4. Enter the offset value
• Determine the dif ference, if any ,
between 400
°
C (750
°
F) and the
measured tip temperature. Record this
value. See the example following to
determine what value to enter as the
of fset for that particular tip.
• When
entering
the
hundred dig
it,
p
ress
the
or
buttons to select eithe
r
positive
(0 is displayed) or negative (– is displayed)
sign for the o
f
fset to be entered.
●
How to enter the tip offset value into the Hakko 942
This method requires measuring the tip
temperatures
with a
tip
thermometer
and
is
recommended
for
the
most
accurate
process
control.
NOTE:
Allow the tip temperature to become stable. During o
f
fset
data entry mode, the tip temperature is controlled using
an of fset value of 0. The flashing value displayed is not
meaningful.
EXAMPLE:
If the measured temperature is 395
°
C (740
°
F), the
dif ference between the set temperature is +5
°
C
(+10
°
F) (the tip is five (ten) degrees too cool) and the
of fset is thus +5
°
C (+10
°
F). If the measured
temperature is 405
°
C/760
°
F, the dif ference between
the set temperature is –5
°
C (–10
°
F) (the tip is five
(ten) degrees too hot) and the o
f
fset is –5
°
C (–10
°
F).
9
Press the button and
hold for one second.
Insert the card.
Default to the
temperature
setting mode
Using the procedure (P7),
set the temperature at 400
°
C
Press the button once.
Press the button once.
Press the button once.
(When the offset is +5.)
Press the or button.
