Wahl ST2200, Руководство пользователя

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ST2200 Soldering Iron Tester User Manual
Page 22 of 34
7.11.5 Set Input Selector Switch to AUX T/C-K, Connect the T/C simulator to the AUX
T/C-K input and allow 5 minutes thermal stabilization time.
7.11.6 Set T/C Simulator for 77, 700 & 1300°F (25, 371.1 & 704.4°C) and record data.
Verify within specs from section 2.0.
7.12 Ohms Calibration – See Figure 6.
7.12.1 Remove the T/C wires from UUT.
7.12.2 Connect test leads (22AWG or larger wire) to the decade box and set it for 0.00
ohms.
7.12.3 Measure Decade Box & leads with a precision Ohmmeter, such as the Agilent
3458A. The reading obtained must be added to all future decade box readings for
proper calibration. For example, if the leads measure 0.20 ohms, the proper
calibration when the decade box is set at 0.00 or 50.00 ohms will be 0.20 and
50.20 ohms respectively.
7.12.4 Connect the Decade Box as shown in Figure 6. For best results, solder a small
piece of wire to the solder bead of the tip sensor and attach the alligator clip from
the Decade Box to it.
7.12.5 Set Function Selector Switch to RESISTANCE and Input Selector Switch to TIP
TEST positions.
7.12.6 Set Decade Box to 0.00 ohms and adjust R33 for a reading equal to the value of
lead resistance found in step 7.12.3. For example, the ST2200 display should
display 0.20 ohms, for a measured lead resistance of 0.20 ohms.
7.12.7 Set Decade Box to 50.00 ohms and adjust R50 for a reading equal to the value of
lead resistance found in step 7.12.3 plus 50.00 ohms. For example, the ST2200
display should display 50.20 ohms, for a measured lead resistance of 0.20 ohms.
7.12.8 Repeat steps 7.12.6 and 7.12.7 for the best calibration.
7.12.9 Verify calibration by measuring and recording readings for inputs of 0.00, 2.00
and 50.00 ohm inputs.