GymnaUniphy Phyaction U, Phyaction E, Phyaction I, Phyaction C User manual
SERVICE INFORMATION
PHYACTION U/E/I/C
Version 0.1 May 2004
Phyaction U/E/I/C – service manual version 0.1 Page 1
1. Contents
1. Contents ............................................................................................................................. 2
2. Preface ............................................................................................................................... 4
3. Important remarks .............................................................................................................. 5
3.1 Safety aspects ................................................................................................................ 5
3.2 Data registration.............................................................................................................. 5
4. Technical data .................................................................................................................... 7
4.1 General technical data.................................................................................................... 7
4.2 Electrotherapy (for Phyaction E/I/C) ............................................................................... 7
4.3 Ultrasound therapy (for Phyaction C/U).......................................................................... 7
5. Unit self test........................................................................................................................ 8
6. Circuit description. .............................................................................................................. 9
6.1 Block shematics .............................................................................................................. 9
6.2 Power supply .................................................................................................................. 9
6.3 User interface board (UI) ................................................................................................ 9
6.3.1 Microprocessor circuits............................................................................................ 9
6.3.2 Display and keyboard circuits................................................................................ 10
6.4 Electro stimulation PCB ................................................................................................ 10
6.4.1 Amplitude generation and signal processing ........................................................ 10
6.4.2 Output circuits........................................................................................................ 10
6.4.3 Poor contact detection........................................................................................... 12
6.4.4 Current measuring circuits..................................................................................... 12
6.4.5 Safety control circuits ............................................................................................ 12
6.4.6 Relay circuits ......................................................................................................... 13
6.4.7 ..................................................................................................................................... 14
7. Ultrasound heads ............................................................................................................. 14
7.1 Contact control indication ............................................................................................. 15
8. Yearly safety inspection ................................................................................................... 16
9. System settings menu. ..................................................................................................... 22
9.1 System information (8).................................................................................................. 22
9.2 Plate electrode test (9).................................................................................................. 23
9.3 Cable test (9). ............................................................................................................... 24
9.4 Error History(11). .......................................................................................................... 24
9.5 Counter working hours.................................................................................................. 25
9.6 Reset menu................................................................................................................... 25
10. Service menus.................................................................................................................. 26
10.1 Change PCB & HW code .......................................................................................... 26
10.2 Functional tests ......................................................................................................... 28
10.2.1 Electro check ......................................................................................................... 28
10.2.2 Ultrasound check................................................................................................... 29
10.2.3 Keyboard check..................................................................................................... 29
10.2.4 Display check......................................................................................................... 29
10.2.5 Invert screen .......................................................................................................... 30
10.3 Count currents........................................................................................................... 30
10.4 Reset menu ............................................................................................................... 31
10.4.1 Reset error history ................................................................................................. 31
10.4.2 Total reset settings. ............................................................................................... 31
11. Upgrading system software.............................................................................................. 33
11.1 General information................................................................................................... 33
11.2 Which tools are required ? ........................................................................................ 33
11.3 Downloading the software......................................................................................... 33
11.4 Troubles with flashing. .............................................................................................. 37
12. Hardware labels................................................................................................................ 38
12.1 Label with hardware code and ref number................................................................ 38
12.2 Upgrading the hardware code................................................................................... 39
12.3 Label with serial number ........................................................................................... 39
13. Troubleshooting................................................................................................................ 40
Phyaction U/E/I/C – service manual version 0.1 Page 2
13.1 General information................................................................................................... 40
13.2 Skipping the self test ................................................................................................. 40
13.3 De-activate the safety relay (only for Phyaction I/E/C) ............................................. 40
13.4 Interpreting error codes............................................................................................. 41
13.5 List of error codes. .................................................................................................... 42
13.6 Error groups .............................................................................................................. 42
13.7 Error list ..................................................................................................................... 42
14. Replacement procedures. ................................................................................................ 52
14.1 Disassemble instructions .......................................................................................... 52
14.1.1 Opening the unit and removing the top cover. ...................................................... 52
14.1.2 Removing the main PCB. ...................................................................................... 52
14.1.3 Removing the power supply board........................................................................ 52
14.1.4 Removing the ultrasound board ............................................................................ 52
14.1.5 Removing the display PCB and/or keyboard......................................................... 53
14.2 Assembly instructions ............................................................................................... 54
14.2.1 Installing the display PCB and/or keyboard........................................................... 54
14.2.2 Installing the ultrasound board .............................................................................. 54
14.2.3 Installing the power supply board.......................................................................... 55
14.2.4 Installing the main PCB. ........................................................................................ 56
14.2.5 Closing the unit and installation of the top cover................................................... 56
15. Compatibility of boards and components ......................................................................... 57
16. Exploded views and spare parts ...................................................................................... 58
Phyaction U/E/I/C – service manual version 0.1 Page 3
2. Preface
The Phyaction series are a family of modern electrotherapy units.
As a member of the Uniphy family they are built according to the most recent requirements of
the MDD security standards.
All functions of the unit are controlled by a microprocessor, ensuring a high degree of reliability
and safety.
An integrated service software system gives the service technician a maximum of information,
in order to locate and repair a technical problem in the most efficient way.
This service manual gives a complete and accurate technical picture of the Phyaction series.
In doing so, it will hopefully help you to reach your goal: to form a correct diagnosis and to solve
the client’s problem as thoroughly as possible.
If you have any questions or if you need additional information about this manual or about the
use of the unit, please do not hesitate to contact us.
GymnaUniphy nv, May 2004
Phyaction U/E/I/C – service manual version 0.1 Page 4
3. Important remarks
3.1 Safety aspects
To understand and practice all procedures described in this manual a good technical
background is a must.
GymnaUniphy cannot be held responsible for any actions executed on the unit by unauthorised
persons, or for executing any procedures not prescribed in this manual.
All information in this manual has a GymnaUniphy nv. copyright.
3.2 Data registration
The Phyaction series has a defined number of critical parts . All critical parts have a serial- or
batch number (marked with a label). GymnaUniphy has the original configuration of each unit
and its critical parts.
In case of a configuration change to one or more of the critical parts, the distributor has to file
the serial- or batchnumber of the part in question.
The Phyaction U has following critical parts:
Ref 322517: Main PCB Phyaction U
Ref 117162: Ultrasound PCB C/P 200 & Phyaction C/U
Ref 116954: Power supply 200 series & Phyaction I/E/C/U
Ref 130015: AC inlet GymnaUniphy
The Phyaction C has following critical parts:
Ref 322528: Main PCB Phyaction C/E
Ref 117162: Ultrasound PCB C/P 200 & Phyaction C/U
Ref 116954: Power supply 200 series & Phyaction I/E/C/U
Ref 130015: AC inlet GymnaUniphy
The Phyaction E has following critical parts:
Ref 322528: Main PCB Phyaction C/E
Ref 116954: Power supply 200 series & Phyaction I/E/C/U
Ref 130015: AC inlet GymnaUniphy
The Phyaction I has following critical parts:
Ref 324914: Main PCB Phyaction I
Ref 116954: Power supply 200 series & Phyaction I/E/C/U
Ref 130015: AC inlet GymnaUniphy
To file this data, a data registration document is available on next page.
Phyaction U/E/I/C – service manual version 0.1 Page 5
Data registration document
Information
Distributor name Distributor address
Customer name Customer address
Instrument name: Serial number:
Date of delivery:
Service activities
Date:
Error complaint:
Service action
Critical spare parts exchange list
Critical part name Old serial number New serial number
Date:
Error complaint:
Service action
Critical spare parts exchange list
Critical part name Old serial number New serial number
Phyaction U/E/I/C – service manual version 0.1 Page 6
4. Technical data
This is a summary of the technical data as described in the user manual.
4.1 General technical data
• Mains voltage: 100 240 VAC 50/60 Hz
• Mains fuses : 2 x T2A/250 V
• Power consumption: maximum 85 VA
• Dimensions (w x h x d): 265 x 275 x 122 mm
• Languages: English, Dutch, French, German, Italian, Portuguese, Spanish
• Weight: +/- 4,6 kg
• Electrical Class I
• Isolation: Type BF
4.2 Electrotherapy (for Phyaction E/I/C)
• Number of electrotherapy channels: 2
• Treatment time: 0-60 min
• Current safety limit: 150% of set current or 110% of the maximum for the selected current
shape.
• Accuracy 10% with a 500 Ω load
• Mode CC/CV except for MF constant rectangular current
4.3 Ultrasound therapy (for Phyaction C/U)
• Treatment time: 0-30 min
• Output power continuous: 0-2 W/cm²
• Output power pulsed : 0-3 W/cm²
• Duty Cycle: 10%, 20%, 30%, 40%, 50%, 100%
• Pulsfrequency: 100 Hz
• Accuracy: +/- 20% at maximum intensity
• Ultrasound head model U91
Power: max 3,8 W at 1,1 MHz
Power: max 2,8 W at 3,2 MHz
ERA: 1,9 cm² at 1,1 MHz
ERA: 1,4 cm² at 3,2 MHz
Frequency: 1,1 and 3,2 MHz
BNR: 5,2 at 1,1 MHz
BNR: 3,3 at 3,2 MHz
• Ultrasound head model U92
Power: max 8,1 W at 1,1 MHz
Power: max 9,5 W at 3,2 MHz
ERA: 4,0 cm² at 1,1 MHz
ERA: 4,8 cm² at 3,2 MHz
Frequency: 1,1 and 3,2 MHz
BNR: 4,5 at 1,1 MHz
BNR: 5,8 at 3,2 MHz
Phyaction U/E/I/C – service manual version 0.1 Page 7
5. Unit self test.
The self test checks proper functioning of the product, especially the safety circuits, and is
activated every time the unit is switched on. The tests are performed by the main microcontroller in combination with the safety micro-controller and take approximately 12 seconds.
When one or both of the controllers detect an error, the output will be disabled. A message will
be shown to the user.
The Phyaction series have a safety relay (RLY209). This relay (Normally Open) is integrated in
the applied part of channel A and Channel B (same relay). In case of a problem, the safety relay
will be switched off immediately and the patient becomes disconnected from the unit.
The safety relay driver circuitry is accessible to the main microprocessor for 3 seconds after
power up of the unit. After this period the main micro-controller will not be able to switch the
electrotherapy safety relay on any more. Both the main and the safety micro-controller are able
to switch the electrotherapy safety relay off (the safe state).
During the selftest of the unit, the following items are checked:
1. Main controller test.
2. Safety controller test.
3. Safety software test.
4. Electrotherapy DAC test Channel A
5. Electrotherapy DAC test Channel B
6. Electrotherapy relay test.
7. Electrotherapy safety comparator test.
8. AC/DC relay test.
9. CC/CV mode test.
Phyaction U/E/I/C – service manual version 0.1 Page 8
6. Circuit description.
6.1 Block shematics
External device
Ultrasound
Power
Sypply
LCD Display
Keyboard &
Encoders
RS232(TTL)
Display driver
Laser circuit
Laser probe
UI PCB ELAL013
Safety Key
Safety
Control
ET PCB ELSM002
Contact
detection
Current m easuring
Output circuit
Amplitude generator
& Signal processing
ET powerstage
Patient
6.2 Power supply
A Switch Mode Power Supply supplies the PCB with +15V, +5V and –15V.
U114 regulates the –15V down to a –5V supply.
Circuit around U119 is a square wave oscillator that generates a square wave with a maximum
voltage of 0V and a minimum of –15V. Following is a voltage doubler that converts the –15V to
–30V that is then regulated up to –22V by the zener D113 for the LCD contrast.
6.3 User interface board (UI)
The user interface boar is a separate board for the Phyaction U. For the Phyaction E/I/C it is
mechanically linked to the electrotherapy board.
6.3.1 Microprocessor circuits.
U103 is the micro controller. U109, U110, U115 and U116 are static RAM’s. U109
and U110 are 32k Ram’s and U115 and U116 are 128k Ram’s. Only one sort is
placed, the 32k’s or the 128k’s depending on how much memory is needed. IC’s
U101 and U102 are Flash Memories that contain the software.
All these devices are addressed by the address bus CA[0:23] and the data is
transported over the data bus DQ[0:15].
Phyaction U/E/I/C – service manual version 0.1 Page 9
6.3.2 Display and keyboard circuits.
U123 is the LCD display driver with its own RAM’s namely U111 and U112. They are
addressed via VA[0:15] and the data is transported over data bus VD[0:15].
Besides controlling the safety circuits (described further on) the “safety” µprocessor
U122 does the scanning of the keyboard and of the two encoders.
The four ENC pins on port B scan the two encoders. The four KEY_SCAN pins of
port B are used to select the scan lines of the keyboard. KEY_CLK provides the
clock on which the keyboard will be scanned and KEYB_INPUT receives the serial
information from the key scan.
6.4 Electro stimulation PCB
This board is mechanically connected to the user interface board and is installed only in
Phyaction C/E/I.
6.4.1 Amplitude generation and signal processing
The amplitude and signal generation is fully done with D/A converters. U214 is a
quadruple 8-bit D/A converter with each DAC having its own reference input.
Each electrotherapy channel uses two of these DACs in series. The first DAC the
Amplitude DAC has a reference of 2,5 V. This DAC is used too set the Amplitude of
the signal. Its output is used as reference for the second DAC the LFDAC. This DAC
modulates its input and therefore can generate the waveforms such as triangular or
sinusoidal DAC_A/B.
The circuit around Op-Amp U231 inverts the signals DAC_A/B IPAA/B
Via the analogue multiplexer U204 a couple of signals from the ET stage can be fed back to the
ADC input of the micro controller U103 so these can be monitored.
6.4.2 Output circuits
Output circuit A and B are identical, therefore only output circuit A is explained.
The ET power stage has only one configuration in contrary to the 500/800
hardware namely constant current.
At the middle connection of the transformer is the +15V supply voltage connected.
The two other sides of the primary windings are connected to the drains Q206.The
gates of Q206 are connected to NEG_A and POS_A. These are the “chopper” FETs.
The sources of Q206 are coupled together and are connected to the drain of Q208
that is the current regulator MOSFET.
The circuit round Op-Amp U221 and MOSFET Q208 controls the current. The circuit
forces a voltage across current sense resistor R201 by controlling the gate-source
voltage of Q208. IPAA is a measure for this voltage across or the current through
R201 and so the output current.
Phyaction U/E/I/C – service manual version 0.1 Page 10
+15V
PO S_ A
NEG_A
IPAA
Figure 6-1 Simplified schematic ET powerstage
By making POS_A or NEG_A high one side or the other of the transformer will
conduct a current and so on the secondary side of the transformer “positive” or
“negative” pulses are generated.
POS_A
10
650µs
-
H
L
L
NEG_A
Figure 6-2 Tens biphasic a-symmetric generation
This can also be done in a constant stream of pulses (f=10kHz), which then
generates a biphasic rectangular pulse train at the output.
POS_A
Amplitude
NEG_A
50µs
Biphasic rectangular pulse train
Figure 6-3 Biphasic pulse train
By varying or modulating IPAA the amplitude and waveform of the output signal is
set.
Constant voltage mode:
The hardware has no real constant voltage mode. Instead a 1kΩ resistor is
switched parallel to the current source. By applying the theorem of Thévenin you
get a non-ideal voltage source with an impedance of 1kΩ.
This results in a behaviour that is close enough to a real constant voltage no
large increase of output voltage when there is no load at the output.
At the secondary side there are some relays with which the rectifying or
combination path can be selected or polarity can be changed.
Phyaction U/E/I/C – service manual version 0.1 Page 11
6.4.3 Poor contact detection
Poor contact detection is done with an opto-coupler U216 in the secondary/patient
circuit. When a current flows through a load/patient the output of U216 will go
“low”. When no current flows through a load (no load poor contact) the output
will go “high”.
Comparator U231 sees to it that no poor contact can be detected when the
amplitude is very low (<10mA). Because opto coupler doesn’t function properly at
low amplitudes.
Only when there is a POS or a NEG signal there can be output. So only then poor
contact detection should work.
Poor contact if: output opto coupler is high AND when POS or NEG is high AND
Amplitude>10mA
6.4.4 Current measuring circuits
The output current is measured at the primary side with a high side current sense
amplifier U212. It measures the voltage over a sense resistor of 80mΩ R320 and
outputs a current equivalent to the current through this sense resistor. The output
current is turned into a voltage by the output resistor so the voltage over R216 is a
measure for the output current.
All component values are chosen so that at maximum allowable output current
+10% (=120mA+10%=132mA) the output voltage of the current measuring is
2.5V
At poor contact the output of the current sense amplifier is shorted to ground with
a MOSFET.
The circuit around Op-Amp U202 and analogue switch U205 is a hold-circuit. So
that at non-continuous currents and/or AC currents the peak levels are holded.
6.4.5 Safety control circuits
The safety control module is built round µProcessor U122. The safety relay is driven
by a RS flip-flop which is build with one NOR and two NAND’s (U219 and U208).
In case of an error detection by one of the micro controllers, the Microchip (U122)
can switch off the safety relay by making MC_SRY_OFF, “high”. The Siemens
µController (U103) can switch off the safety relay by making S_SRY_OFF, “high”.
A “high” level on MC_SRY_OFF or S_SRY_OFF-line will bring the “SET” input of the
flip-flop ‘low’. The output state of the flip-flop becomes “low”. The safety relay is
switched off.
The “SET” input can also be “low” when the UVLO (under voltage lockout) or POR
(power on reset) signals are “low”.
Note that even when error is not longer occurring, the output state of the RS-flipflop stays “low”. The safety relay stays switched off.
In normal operation TIMELOCK is “high”. When the safety relay is switched off,
then the safety relay cannot be switched on again. The only way to reactivate the
safety relay is to switch off and on the power.
When the TIMELOCK signal is “low”, a reset of the RS flip-flop is done. The outputstate of the flip-flop becomes “high”. Safety relay is switched on. The output state
remains as long as no “low” signal is available on the “SET”-input of the flip-flop.
Only during initialisation (self-test) TIMELOCK is low, so then the state of the safety
relay is equal to (MC_SRY_OFF NOR S_SRY_OFF) NAND !PROTECTION.
Phyaction U/E/I/C – service manual version 0.1 Page 12
Comparator U218 and DAC U206 guard the output level. U218 compares the output
signals from the current measuring circuit CUR_A_SAF/CUR_B_SAF with
FDBACK_SAFA/FDBACK_SAFB reference voltages. These reference voltages are
generated by the safety DAC U206 and are set up by the µProcessor U122 via bus
MC_DATA[0:7]. The levels of these voltages (0,284V-2,5V // 15mA-132mA) are a
measure for the output current and are adjusted when the intensity of the ET
output is altered by the user. U209 serves as a buffer for the
FDBACK_SAFA/FDBACK_SAFB signals. If these signals are exceeded by CUR_A_SAF
and/or CUR_B_SAF then !PROTECTION will go “low”. This will change the state of
the flip-flop from “high” to “low” so the safety relay RLY209 will be switched off.
The ET_ERROR-line is “low” when the safety relay is on. The ET_ERROR-line is
monitored by U103 and U122.
All these situations described above are only valid if CON202 is in OPERATE mode
and CON9 has no jumper.
When CON202 is in service mode then the relay stays switched on even when error
occurs. The error information is now directly linked with the ET_ERROR line.
If CON108s a jumper then the safety relay can be switched on/off at all time
because TIMELOCK will be “low” at all time.
6.4.6 Relay circuits
IC U224 is a Darlington transistor array which makes it possible to drive the relays
with the low power signals from the µC. Diodes for inductive load suppression are
integrated in this IC.
Phyaction U/E/I/C – service manual version 0.1 Page 13
6.4.7
7. Ultrasound heads
The Phyaction U and Phyaction C can be delivered with 2 different multifrequent ultrasound
heads:
Model U91 : 1 cm² 1/3 MHz
Model U92 : 4 cm² 1/3 MHz
(See technical specifications for more details)
The unit has two ultrasound output connectors.
The ultrasound head converts the electric signal into ultrasound using a piezo crystal. This crystal,
with a diameter depending on the desired head size, is glued in an aluminium cup that minimises
electromagnetic radiation and enables the crystal to be used on to operating frequencies.
The aluminium cup can also be used as a second electrode if combination therapy is desired. A
separate electrotherapy device needs to be connected to the safety socket for combination
therapy.
An OTP is installed in the connector of the treatment head to enable the micro controller to detect
whether a head is connected and to recognise the type of head that is connected. It also contains
the calibration values of the head in question.
The ultrasound head has an auditif and visual contact control indication: the treatment heads
are fitted with light of two colours, yellow and green.
The following configurations are possible:
Blinking green: The US head is properly connected
Continuous green: The US head is selected
Continuous yellow: The US-emission is in progress
Alternating yellow/green: Bad contact of the US head with the skin
Blinking yellow: End of treatment
Phyaction U/E/I/C – service manual version 0.1 Page 14
7.1 Contact control indication
Depending on the contact between the US head and the patient, the display has the following
possible indications:
Phyaction U/E/I/C – service manual version 0.1 Page 15
8. Yearly safety inspection
The ‘Directive on Medical Devices’ from the European Commission (92/42/EEG) requires that
safe devices are used.
It is recommended to perform a yearly technical safety inspection.
If the legislation in your country or your insurer prescribes a shorter period, you must adhere to
this shorter period.
On the following pages the format of the yearly checkup is printed. Fill out this document for
each test.
In order to perform this test, the following devices are needed:
- Digital Ultrasound power meter
- Oscilloscope 20 MHz at least
- 500 Ohm power resistor
- Electrical safety tester (according to IEC or VDE)
Phyaction U/E/I/C – service manual version 0.1 Page 16
Safety inspection list
Customer identity
Unit:
Serial number:
Date:
Test 1: General inspection
Pa
Results of earlier safety inspections are available
The logbook is present
The type plate and supplier’s label are legible
The housing, the adjusting knobs, the keys and the display are undamaged
Fail N.A
ss
.
Power connection and power cord are undamaged
The output connectors are undamaged
The electrode connectors and cables are undamaged
(Phyaction E/I/C)
Cable and connector of the ultrasound treatment head(s) are undamaged
(Phyaction C/U)
The US head(s) do not display any cracks or other damage that can endanger the
insulation
(Phyaction C/U)
The automatic self-test when switching on the appliance does not report any
errors
The display does not have any defective points or lines
Remarks:
Phyaction U/E/I/C – service manual version 0.1 Page 17
Test 2: Electrotherapy
Skip this test for a Phyaction U
Connect a load of 500 Ω to the electrode cables of both connectors. Hook up an oscilloscope to
the loads (black cable = ground).
Select channel A, program 4: MF Constant Pa
ss
At maximum intensity the output matches the set peak value within ±10%
The output waveform corresponds to photo 1
Fail
The polarity changes over to negative when set to RED-
Disconnecting the load gives “poor contact to patient”
Select channel B, program 4: MF Constant Pa
ss
At maximum intensity the output matches the set peak value within ±10%
The output waveform corresponds to photo 1
The polarity changes over to negative when set to RED-
Disconnecting the load gives “poor contact to patient”
Select channel A, program 23, 2 pole MF mode CV Pa
ss
At maximum intensity the output matches the set peak value within ±10%
The output waveform corresponds to photo 2 and 3
The yellow light next to the output connector is lit when intensity is not 0
Disconnecting the load gives “poor contact to patient”
Select channel B, program 23, 2 pole MF mode CV Pa
ss
Fail
Fail
Fail
At maximum intensity the output matches the set peak value within ±10%
The output waveform corresponds to photo 2 and 3
The yellow light next to the output connector is lit when intensity is not 0
Disconnecting the load gives “poor contact to patient”
Remarks:
Phyaction U/E/I/C – service manual version 0.1 Page 18
Photo 1
Photo 2
Photo 3
Phyaction U/E/I/C – service manual version 0.1 Page 19
Test 3: Ultrasound
Skip this test for a Phyaction E or a Phyaction I
Connect the treatment head and place it in a calibrated ultrasound power meter.
Select ultrasound therapy
Ultrasound treatment head model U91 with SN Pa
Fail N.A
ss
Select 1 MHz, continuous (duty cycle 100%), 2 W/cm²
Measured value is ±20% of the PPK value in the channel window
Select 1 MHz, duty cycle 50%, 3 W/cm²
Measured value is ±20% of half the PPK value in the channel window
Select 3 MHz, continuous (duty cycle 100%), 2 W/cm²
Measured value is ±20% of the PPK value in the channel window
Select 3 MHz, duty cycle 50%, 3 W/cm²
Measured value is ±20% of half the PPK value in the channel window
Select 3 MHz, duty cycle 50%, 0.5 W/cm²
With a dry treatment surface the PPK value drops to 0
Select 1 MHz, duty cycle 50%, 0.5 W/cm²
With a dry treatment surface the PPK value drops to 0
Ultrasound treatment head model U92 with SN Pa
Fail N.A
ss
Select 1 MHz, continuous (duty cycle 100%), 2 W/cm²
Measured value is ±20% of the P
value in the channel window
PK
Select 1 MHz, duty cycle 50%, 3 W/cm²
Measured value is ±20% of half the PPK value in the channel window
Select 3 MHz, continuous (duty cycle 100%), 2 W/cm²
Measured value is ±20% of the PPK value in the channel window
Select 3 MHz, duty cycle 50%, 3 W/cm²
Measured value is ±20% of half the PPK value in the channel window
Select 3 MHz, duty cycle 50%, 0.5 W/cm²
With a dry treatment surface the PPK value drops to 0
Select 1 MHz, duty cycle 50%, 0.5 W/cm²
With a dry treatment surface the P
value drops to 0
PK
Remarks:
.
.
Phyaction U/E/I/C – service manual version 0.1 Page 20
Test 4: electrical safety test according to VDE 0751
Parameter Measured Limit Comments Pass Fail
Protective earth resistance
Ω < 0.2 Ω
Enclosure leakage current µA < 1000 µA
Patient leakage current µA < 5000 µA
The unit ……. With serial number …… has passed/failed the test
Name service engineer Signature
Phyaction U/E/I/C – service manual version 0.1 Page 21
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