Wahl ST2200 User Manual page 25

ST2200 Soldering Iron Tester User Manual
7.14 Millivolt Calibration AC + DC
NOTE: The ST2200 measures the True RMS of the sum total of AC + DC
voltages presented to the sensor with respect to power ground. There is no
separate adjustment for the AC + DC function. It is calibrated when the
calibration is performed on the AC ONLY function.
7.14.1 Connect a DC Millivolt source, True RMS Millivolt meter (AC reference
voltmeter) to ST2200 as shown in Figure 7. For best results, solder a small piece
of wire to the solder bead of the tip sensor and attach the alligator clip from the
DC Millivolt source to it.
7.14.2 Set the DC millivolt source to 0.00mV. Verify the ST2200 display reads 0.02
millivolts to within its accuracy specifications from Section 2.0. Insert other DC
millivolt settings within the 0-30mV range and verify the readings to be within
the stated accuracy.
7.15 Spike Test Verification
The Spike Test section is to verify the spike detection circuit is functioning
properly. There are no adjustments to this circuit, thus a failure of this test would
need to be looked at by a qualified technician or returned to Wahl Instruments for
evaluation and repair.
7.15.1 Set the Pulse Generator for a 1 microsecond, 100mV pulse.
7.15.2 Connect the Pulse Generator to the ST2200 sensor as shown in Figure 8.
7.15.3 Set Function Selector Switch to MILLIVOLTS AC ONLY and Input Selector
Switch to TIP TEST positions.
7.15.4 Trigger the Pulse Generator and watch for the "VOLTAGE SPIKE" indicator to
Flash Red for approximately 1 second.
7.15.5 Record the results.
7.16 Wrist Strap Test Verification
7.16.1 Set Function Selector Switch to RESISTANCE and Input Selector Switch to TIP
TEST positions.
7.16.2 Connect appropriate resistances between Wrist Strap Test Input Banana Jack and
Wrist Strap Test Acorn Nut to test threshold levels of Wrist Strap Test. Wahl
recommends using 450KÙ and 11MÙ resistors which should indicate failures
and a 5MÙ resistor which should indicate pass.
7.16.3 Record the results.
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