Display Resolution Setting; Sensor Maintenance - Wahl ST2200 User Manual

ST2200 Soldering Iron Tester User Manual
6.1

Display Resolution Setting

Reference Figure 3 for the PC board jumper locations for resolution settings.
6.1.1 Temperature, Tip Voltage (mV) and Resistance Display Resolution
The ST2200 LCD display is factory set at 0.1° resolution for Temperature and .01
for Tip Voltage (mV) and Resistance (Ù) readings. To change the resolution
from 0.1° to 1.0° resolution for Temperature and from .01 to .1 resolution for Tip
Voltage (mV) and Resistance (Ù) measurements, solder a small jumper wire
between pads N and P. These pins are also designated on the PC board silk
screen as "1 DEG RES". Please note that this changes Temperature, Tip Voltage
and Resistance display resolutions. These are not independently changeable.
6.1.2 Resistance Threshold
The ST2200 is factory set at 5.00 ohms but is user selectable, via jumpers, to
change the FAIL MV/OHM Indicator threshold resistance between 2.00 ohms and
5.00 ohms.
For 2.00 Ohm threshold place the top jumper (indicated by jumper A on Fig. 3) in
the lower position labeled 2Ù . Place the bottom jumper (indicated by jumper B
on Fig. 3) in the lower position labeled 2Ù.
For 5.00 Ohm threshold place the top jumper (indicated by jumper A on Fig. 3) in
the upper position labeled 5Ù. Place the bottom jumper (indicated by jumper B
on Fig. 3) in the upper position labeled 5Ù.
6.2

Sensor Maintenance

Sensors for the ST2200 require periodic maintenance. Wahl recommends that
you periodically inspect, clean and re-tin the sensors. Cleaning is performed to
remove any buildup of solder flux. Clean with warm water or appropriate
solvent, using the brush provided or any other medium stiffness brush. Use care
not to apply to much pressure.
Re-tinning the sensor may need to be performed if the solder bead becomes dull
and does not wet the tip satisfactorily. The old solder may be removed with
solder wick and new solder applied. Be sure to apply a small bead, enough to
provide adequate contact between the sensor and the tip. Wahl recommends
using Sn63Pb37 solder
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