ULTRATHERM 908i
4
gbo Medizintechnik AG 2004
Version 1.2
4.7. Check of generator frequency and pulse parameters
20
4.7.1. Generator frequency
20
4.7.2. Pulsed operation of „70 Hz“
20
4.7.3. Pulsed operation of „350 Hz“
20
4.8. Check of the power output
20
4.8.1. Coil applicator
20
4.8.2. Capacitor-field applicator
21
4.8.3. Auxiliary check of the power output
21
4.9. Check of the internal error recognition circuits
22
4.9.1. Temperature monitoring circuit
22
4.9.3. Generator voltage
22
4.10. Continuous operation
22
4.10.1. Preparation for continuous operation
22
4.10.2. Performance of the continuous operation
22
4.11. Final test
23
4.11.1. High-voltage test
23
4.11.2. Measurement of the leakage current of the casing
23
4.11.3. Earthing conductor test
23
4.11.4. Measurement of the mains current consumption
24
4.11.5. Check of the power values
24
4.11.6. Operation check
24
5. SERVICE INSTRUCTIONS
25
5.1. Function check of the power generator A200
25
5.1.1. Check of the supply voltages
25
5.1.2. Readiness for operation of the A200 subassembly
25
5.1.3. General information on the power loop
26
5.1.3.1. Level control
26
5.1.3.2. Amplification tract
26
5.1.3.3. Power and mismatching meter LFM
27
5.1.3.4. Adding amplifier
27
5.1.3.5. Subtracting amplifier
28
5.1.3.6. Multiplier (N202)
28
5.1.3.7. Setpoint/actual value comparator
28
5.1.3.8. Cable voltage monitoring circuit
29
5.1.3.9. Analogous OR interconnection
29
5.1.4. Operation of the power supply
29
5.1.5. Oscillator
30
5.1.6. Driver
30
5.1.7. RF circuits at the final stage output
30
5.1.8. Typical measurement values with a matched load (50 ohm)
30
5.2. Repair instructions for the control computer (A400)
31
5.2.1. Indication of the error conditions
31
5.2.2. Description of the control computer signals
32
5.3. Power supply (A100)
33
5.4. Output circuit (A300)
33
5.5. Harmonic filter (A500)
33
