Wahl ST2200 User Manual page 21

ST2200 Soldering Iron Tester User Manual
7.8 Set-up – See Figure 5.
7.8.1 Remove bottom cover and place UUT on its side.
7.8.2 Connect DVM (-) to TP3, (+) to TP6.
7.8.3 Remove ST2200 sensor and connect T/C Simulator, via T/C wire set to banana
plugs on front panel. Red wire is negative (-). ST2200 banana plug furthest from
the LCD is negative input.
7.8.4 Set ST2200 Function Selector Switch to TEMPERATURE position, and Input
Selector Switch to TIP TEST.
7.9 A/D Calibration
7.9.1 Adjust R28 (ref adj.) until DVM reads 1.0000 VDC ±0.1 mVDC.
7.9.2 Remove DVM connected to (-) to TP3 and (+) to TP6
7.10 Low Temperature Calibration
Note: Allow 5 minutes thermal stabilization period after connecting input wires to
the ST2200.
7.10.1 Adjust T/C Simulator output to 77.0°F (25.0°C)
7.10.2 Adjust R4 (Temp-zero) until UUT display indicates 77.0°F (25.0°C).
7.11 High Temperature Calibration
7.11.1 Adjust T/C Simulator for 1300.0°F (704.4°C) and adjust R86 (Span) until UUT
display indicates 1300°F (704.4°C)
7.11.2 Adjust T/C Simulator to 77°F (25°C) and verify accuracy of display. UUT must
be within ±1.0°F/°C.
7.11.3 Repeat steps 7.10.1 through 7.11.2 as necessary to obtain the most accurate
calibration. (There may be some interaction between R86 and R4.)
7.11.4 Measure and record readings for inputs of 77, 700 & 1300°F (25, 371.1 &
704.4°C). Verify accuracy specs from Section 2.0.
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