Valleylab Force FX-8C - Check and Adjust the Reactance Gain

Calibrating the Generator
5-34 Force FX-8C Service Manual
e. Connect a monopolar footswitch to the Monopolar 1 Footswitch
receptacle on the rear panel.
2. Check and adjust the V 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 216 ± 3 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 Low cut mode is adjusted automatically.
3. Replace the 3000 ohm resistor with the 2000 ohm resistor.
4. Check and adjust the V factor for the Blend mode.
a. Press the Blend button.
b. Press the footswitch cut pedal and check the voltmeter for a
reading equivalent to 300 ± 3 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.
5. Disconnect the test cables and remove the 2000 ohm resistor.
6. To save the voltage sense gain calibration and go to the next calibration
step, press the Bipolar up arrow (∆) button.
Next, go to Step 7 – Check and Adjust the Reactance Gain
Step 7 – Check and Adjust the Reactance Gain
Equipment required:
• Two short test cables (less than 61 cm [24 in.] long) with banana plugs
• Current transformer (such as the Pearson Model 411 or equivalent)
• True RMS voltmeter (such as the Fluke 8920 or equivalent)
• 30 and 200 ohm noninductive power resistors (such as the Dale
NH-250)
• Bipolar footswitch and monopolar footswitch.
Verify that the Bipolar display shows calibration step 7. The Cut and Coag
displays show the Z (reactance) factor. If it is four or more digits, the most
significant digits are shown in the Cut display.
Notice
Do not adjust the reactance gain while the generator is activated.