Hakko Electronics 192 Calibration Instructions

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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.

American Hakko Products, Inc.

Hakko 192 Calibration Instructions

Revision 2003-01

28920 N. Avenue Williams • Valencia • California 91355

Tel 661.294.0090 • Fax 661.294.0096 • www.hakkousa.com

Page 1 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.
Page 2 12. Adjust trimpot VR3 until a 90.0mV reading is obtained on the Hakko 192 display. 13. Check the Hakko 192 display at output settings of 1.0mV, 2.0mV, and 3.0mV to see that it is accurately measuring the low end of the scale. If it does not, repeat steps 1 through 12 again.
Page 3 6. Adjust trimpot VR6 until a 90.0 ohms reading is obtained on the Hakko 192 display. 7. Check the Hakko 192 display at decade resistance box settings of 1 ohm, 2 ohms, and 3 ohms to see that it is accurately measuring the low end of the scale. If it does not, repeat steps 1 through 6 again.
Page 4 American Hakko Products, Inc. Hakko 192 PCB Layout 28920 N. Avenue Williams • Valencia • California 91355 Tel 661.294.0090 • Fax 661.294.0096 • www.hakkousa.com...