Valleylab Force FX-C - Page 109

Force FXTM-C Service Manual
Calibrating the Force FX-C Generator
2. Check and adjust the 1 factor for bipolar output.
a. Press the Med (Standard) button.
b. Press the bipolar footswitch pedal and check the voltmeter for a
reading equivalent to 1790 ± 20 rnA rms.
c. Stop activation. If the output current reading was too high, raise the
I factor by pressing the Coag up arrow (~) button. If the reading
was too low, lower the I factor by pressing the Coag down arrow
( \7 ) button.
Repeat this step until the voltmeter reading is within the stated range.
The I factor for the Precise and Macro modes is adjusted automatically.
3. Disconnect the test cables from bipolar output.
Checking the Current Sense Gain for Monopolar Output
1. Connect the test equipment for monopolar output.
a. Connect one test cable to the left jack in the Monopolar l/CEM
Instrument receptacle. Pass the test cable through the current
transformer and connect the current transformer to the voltmeter.
b. Use a test cable to short the two pins on the Patient Rehun
Electrode receptacle.
c. C OImect the second test cable from the voltmeter to both pins of the
Patient Return Electrode receptacle.
d. Verifv that the 10 ohm resistor is comlected to the test cables
through the current transformer for monopolar output.
e. Cormect a monopolar footswitch to the Monopolar 1 Footswitch
receptacle on the rear pemet.
2. Check and adjust the I factor for the Low and Pure cut modes.
a. Press the Pure button.
b. Press the footswitch cut pedal and check the voltmeter for a
reading equivalent to 1250 ± 8 rnA rms.
c. Stop activation. If the output current reading was too high, raise the
1 factor by pressing the Coag up ( Ll ) arrow button. If the reading
was too low, lower the I factor by pressing the Coag down arro'w
(v) button.
Repeat this step until the voltmeter reading is within tile stated range.
The I factor for the Low cut mode is adjusted automatically.
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