Valleylab Force FX-8C, Service Manual

Page: 117 / 218

Calibrating the Generator
Setup, T
ests, and Adjustments
Force FX-8C Service Manual 5-33
Checking the Voltage Sense Gain for Bipolar Output
1.
Connect the test equipment for bipolar output.
a.
Connect the two test cables to the Bipolar Instrument receptacle.
b.
Pass one test cable through the current transformer and connect the
current transformer to the voltmeter.
c.
Connect the 1000 ohm resistor across the output jacks at the end of
the test cables.
d.
Connect the bipolar footswitch to the Bipolar Footswitch receptacle
on the rear panel.
2.
Check and adjust the V factor for bipolar output.
a.
Press the Standard button.
b.
Press the bipolar footswitch pedal and check the voltmeter for a
reading equivalent to 98 ± 14 mA rms.
c.
Stop activation. If the output current reading was too high, raise the
V factor by pressing the Coag up arrow (
∆
) button. If the reading
was too low, lower the V factor by pressing the Coag down arrow
(
∇
) button.
Repeat this step until the voltmeter reading is within the stated range.
The V factor for the Precise and Macro modes adjusts automatically.
3.
Disconnect the test cables and remove the 1000 ohm resistor.
Checking the Voltage 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 1/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 Return
Electrode receptacle.
c.
Connect the second test cable from the voltmeter to both pins of the
Patient Return Electrode receptacle.
d.
Connect the 3000 ohm resistor to the test cables through the current
transformer for monopolar output.
Notice
Do not activate the generator with any load resistor lower than 1000 ohms while
calibrating the voltage sense gain for bipolar output. Otherwise, product damage
will result.
Notice
Do not activate the generator with any load resistor lower than 3000 ohms while
calibrating the voltage sense gain for the Low and Pure cut modes. Do not
activate the generator with any load resistor lower than 2000 ohms while
calibrating the voltage sense gain for the Blend mode. Otherwise, product
damage will result.