Tip Voltage Potential Measurements - Wahl ST2200 User Manual

ST2200 Soldering Iron Tester User Manual
same pressure as in soldering. The wire sensor WST-03, is best used by placing
the tip underneath the center of the wire and lifting with gentle pressure to assure
good contact. A small bead of solder should be placed on the iron tip at the area
to be measured. Watch the display and observe the temperature readings for:
a. Temperature rise as the tip heats and melts the solder bead on the sensor.
Equilibrium will be reached in about 5 - 10 seconds.
b. Temperature Stability. After reaching equilibrium expect only a few
degrees of temperature variations. Watch the display for the maximum
and minimum temperatures of the soldering iron over a period of 1 - 2
minutes. Watch for excessive temperature cycling due to a faulty
soldering iron controller.
c. Temperature recording can be made using the Recorder Output Jack.
The ST2200 displays the temperature of the working surface of the tip. It may not
agree with the indicated temperature of the soldering station or the setting of the
soldering iron control. Following are possible reasons:
a. The tip may be oxidized and may need to be cleaned and re-tinned.
b. May be due to the method the iron was last calibrated. Manufacturers may
use a special tip for calibration purposes which may be different from
your tip.
c. The ST2200 sensor may need to be cleaned and a new solder bead applied.
See section 6.2 for maintenance instructions. In some cases, after
prolonged use the sensor may need to be replaced. Replacement sensors
or sensor rebuilding kits are available from Wahl Instruments.
4.4

Tip Voltage Potential Measurements

The ST2200 has 2 methods of measuring the Voltage potential at the tip, AC only
or AC + DC.
4.4.1 Millivolts AC Only
When the ST2200 Function Selector Switch is in the MILLIVOLTS AC ONLY
position, the instrument will indicate the True RMS voltage of the unit under test,
when applied to the sensor. All measurements are made with respect to the Earth
Ground pin of the AC line plug.
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 voltage.
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