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Why is the measured tip temperature lower than the set temperature?
Important points are maintenance of the soldering iron and measuring instrument and using the correct measurement method.
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Check 1 Are the tip, element cover, nut, etc. oxidized?
Check 2 Is the tip shape changed?
Check 3 Has the sensor of the thermometer deteriorated? (In the case of HAKKO-manufactured contact-type measuring instruments)
Check 4 Are the batteries low on power? (In the case of HAKKO 191)
Check 5 Is the correct measurement method suitable for the measuring instrument being performed?

Check 5. Is the correct measurement method suitable for the measuring instrument being performed?
If the wrong method is performed for measurements, the correct temperature is not obtained in some cases.

Measure the temperature with the correct method suitable for the measuring instrument again.
If the temperature is still shown lower, confirm the details in Checks 1 through 4.


Correct measurement method for HAKKO FG-100, HAKKO FG-101, HAKKO 191 and HAKKO 192
We HAKKO recommend that the same tip undergoes measurement several times and the measured maximum temperature is adopted as a correct tip temperature. Since the temperature may be displayed lower for I-type and 1C-type tips whose tip end is thin in particular, take sufficient time for measurement and read the temperature when the displayed data are stable.

* NOTE
If a measuring instrument manufactured by another company is used, refer to its instruction manual.
Remove solder stuck on the soldering tip before measurement. 1. Remove solder stuck on the tip before measurement.
Apply new solder in the soldering tip. 2. Apply new solder in the tip.
Place the soldering tip on the measuring point and apply solder to it. 3. Place the tip on the measuring point and apply solder to it.


* NOTE
The sensor also becomes deteriorated gradually as the number of measuring times increases, causing the correct temperature not to be obtained. Refer to Check 3.

At this time, if too much solder is applied to the tip, heat will be absorbed by the solder, causing the correct temperature not to be obtained.

The way of placing the tip to the measuring point should be changed depending on the tip shape. For further details, refer to "Points for measurement" shown below. The photo shows an example where the T12-B type is used.

Do not touch the slide pin which is weak to high temperature by tip nor solder directly.

Slide pin
Read the displayed values and repeat the items 1 through 4. Check the maximum temperature. 4. Read the displayed values. (The photo shows 376ºC.)



5. Repeat the items 1 through 4. Check the maximum temperature.

Points for measurement

Placing the tip on the measuring point horizontally enables the correct temperature measurement.
How to place the plated face to the measuring point for the B type, I type and D type, in the case of a soldering tip with standard solder plating,
For the B type, I type and D type, in the case of a tip with standard solder plating, place the center of the solder plating to the measuring point as shown left.
How to place the plated face to the measuring point for the BC type and C type.
For the BC type and C type, in the case of a face with solder plating, place the plated face to the measuring point as shown above.

CAUTION: It is impossible to measure while applying hot air of Hot Air Rework System (HAKKO FR-801, etc.) directly.
Use the Temperature Probe (No. C1541) specifically for Hot Air Rework Systems.
Replacement parts for Temperature Probe for Hot Air Rework System(No. C1541)

Can not use it for measuring the hot air (HAKKO FR-801, etc.） directly.

If many soldering irons are measured every day by several persons, since it is likely to generate differences among individuals, it is recommended that measurements be taken by the same person under the same conditions.
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