Wahl ST2200, User Manual

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ST2200 Soldering Iron Tester User Manual
Page 12 of 34
If an oscilloscope is connected to the tip and the waveform viewed, with respect
to the soldering iron power ground, the basic frequency of the line power is seen
but the waveform may or may not be uniform. In most cases the waveform will
be distorted due to the effects of distributed capacitance throughout the soldering
iron heater and sensor circuitry. In any case, the True RMS feature of the ST2200
will measure the power content of the available signal and display it as an
engineering unit, RMS millivolts.
4.4.2 Millivolts AC + DC
When the ST2200 Function Selector Switch is in the MILLIVOLTS AC + DC
position the total True RMS value of all AC and all DC voltages at the tip are
measured and displayed.
The FAIL MV/OHM warning indicator (3) will flash red for any reading of 2.00
mV and above while the actual mV value is shown by the digital display. The
units range is 0.00 to 30.00 mV True RMS of AC + DC voltage.
4.4.3 Voltage Spike Detection
The voltage spike detector is operational in mV mode of test only and when the
soldering iron tip is in contact with the ST2200 sensor. Detection of a potentially
damaging voltage spike is indicated by the Voltage Spike indicator (11) flashing
from GREEN to RED. Each voltage spike transient detected will flash the
indicator for approximately one second.
4.5
Resistance Measurement
The ST2200 measures resistance of the soldering iron probe tip to AC ground. To
measure, set the Function Selector Switch to the RESISTANCE setting and touch
the tip of the iron to the ST2200 sensor. If the resistance is less than 5.00 ohms
the FAIL MV/OHM indicator (3) will be green. When the resistance is equal to
or greater than 5.00 ohms the FAIL MV/OHM indicator (3) will flash red. The
actual value will be displayed in Ohms on the LCD display.
See Section 8.3 for more technical information on Resistance measurements and
Grounds.
4.6
Wrist Strap Test
To test the wrist strap, connect the jack on the wrist strap cord to the Wrist Strap
Test Jack (9) on the ST2200. Set the Function Selector Switch to the
RESISTANCE - WRIST STRAP TEST position. Insure that the wrist strap is
worn on the wrist of the operator and is in intimate contact with the skin. Touch
the silver acorn nut located next to the Wrist Strap Test Jack with a finger. The
WRIST STAP INDICATOR will remain RED if the wrist strap is faulty or
change to GREEN if the wrist strap is acceptable.
5.0 REPLACEMENT SENSORS AND ACCESSORIES