Valleylab Force 2-2 PCH, Руководство по обслуживанию

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Calibration
6-4 Force 2 Service Manual
Calibration
You obtain the best performance if each adjustment is made to the exact
setting. If you use substitute equipment, it must meet or exceed the
specifications of the recommended equipment. Also, the manufacturer
makes all calibrations in the procedure before Quality Assurance accepts
the generator. If you only need to recalibrate RF output power, proceed
directly to step 4 of the procedure.
Take special care in step 3. Calibrate the 100X probe and the oscilloscope
together before using.
Calibration Procedure
1.
Remove the cover from the Force 2 generator to expose the internal
controls and test points.
2.
+12 V Supply: Connect the digital multimeter between pins 5 or 6 and
pins 1 or 2 on the 40-pin interconnect cable. The meter should read
+12 V ± 0.3 V.
+5 V Supply: Connect the digital multimeter between pins 3 or 4 and
pins 1 or 2 on the 40-pin interconnect cable. The meter should read
+5 V ± 0.25 V.
-5 V Supply: Connect the digital multimeter between pin 7 and pins 1
or 2 on the 40-pin interconnect cable. The meter should read -4.75 V
± 0.2 V.
3. Adjust the High Voltage Clamp
a. Set the coag power setting display to 30 W.
b. Attach a 300 ohm load from the generator output to the PATIENT
receptacle.
c. Activate the generator in coag. Output power should be
30 W ± 5 W.
d. Remove the 300 ohm load.
e. Adjust the coag power setting display to 1.
f. Attach an oscilloscope with a 100X probe between the anode of
CR1, TP11, and ground. Activate the generator in coag. Slowly
increase the coag power setting display and observe the peak
positive voltage. Adjust R19 on the Power Supply board so that the
maximum peak voltage is 440 V ± 15 V.
Caution
Special caution should be used when working on the exposed Power Supply
board as the heatsinks and many of the components are floating at potentially
harmful voltage potentials. Use the footswitching
ACCESSORY
receptacle for
generator output on the Force 2-8 PCH and Force 2-2 PCH generators.