28920 N. Avenue Williams • Valencia • California 91355
Tel 661.294.0090 • Fax 661.294.0096 • www.hakkousa.com
American Hakko Products, Inc.
Hakko 192 Calibration Instructions
Revision 2003-01
Tools Required:
1 ea. Room Temperature Thermometer
1 ea. Yokogawa 2422 Calibrator or equivalent
1 ea. Yokogawa 2786 Decade Resistance Box or equivalent
1 ea. Phillips Head Screwdriver
1 ea. Calibration Trimpot Screwdriver
Temperature Measurement Calibration
IMPORTANT:
Be sure to attach the thermometer reference junction temperature detection
sensor (For Yokogawa the part number is RJ Sensor B9638CR). Failing to do so will result in
a faulty calibration.
1. Attach the appropriate leads from the calibrator to the thermocouple posts on the Hakko
192.
2. Turn on the Hakko 192 and set the unit to measure temperature.
3. Turn the calibrator power ON but make sure the output voltage is set to OFF. The
Hakko 192 display should read room temperature.
4. Se the calibrator for the output voltage corresponding to Type K thermocouples.
5. Set the output to -17.8°C.
6. Turn the output voltage ON and adjust trimpot VR1 until the Hakko 192 display reads -
019°C or -002°F.
7. Set the output to 500°C and adjust trimpot VR2 until the Hakko 192 display reads 501°C
or 934°F.
NOTE:
The reason the lower and upper end readings are slightly offset (-1.1°C on
the lower end and +1.0°C on the upper end) is so the Type K thermocouple hysteresis
will align more accurately to the most commonly used soldering temperature range of
250°C~450°C (482°F~842°F).
8. Set the output on the calibrator to 400°C and check to see that the reading on the
Hakko 192 display is 400°C ±3°C or 752°F ±5°F.
