Reflex RX101 User manual

I
RX101 PPG Recorder
Instruction Manual
Version 1.3

II
Version Control
Date
Description
Version No.
Remark
May 12, 2012
Initialize first draft
-Set table of content
1.0
May 20, 2012
Complete User Instruction
1.1
May 21, 2012
Complete Safety and Introduction
1.2
June 28, 2012
Complete Frist Draft
1.3

III
User Instructions
This Manual is written and compiled in accordance with the council directive MDD93/42/EEC for
medical devices and harmonized standards. In case of modifications and software upgrades, the
information contained in this document is subject to change without notice.
The Manual describes, in accordance with RX101 PPG Recorder’s features and requirements, main
structure, functions, specifications, correct methods for transportation, installation, usage, operation,
repair, maintenance, storage, etc. as well as the safety procedures to protect both the user and
equipment. Refer to the respective chapters for details.
Please read the User Manual carefully before using this product. The User Manual which describes
the operating procedures should be followed strictly. Failure to follow the User Manual may cause
measuring abnormality, equipment damage and human injury. The manufacturer is NOT responsible
for the safety, reliability and performance issues and any monitoring abnormality, personal injury
and equipment damage due to users' negligence of the operation instructions. The manufacturer’s
warranty service does not cover such faults.
Owing to the forthcoming renovation, the specific products you received may not be totally in
accordance with the description of this User Manual. We would sincerely regret for that.
This product is designed for medical research, education, and health and wellness applications.
WARNING:
It is recommended that the sensor should not be applied to the same finger for over 2
hours, as the device may disrupt microcirculation on the body part.
Be advised that the device cannot be clipped on the edema and tender tissue.
Do not stare directly at the LED lights as the light (the infrared is invisible) emitted
from the device is harmful to the eyes.
Please refer to the correlative literature about the clinical restrictions and caution.
Testee cannot use enamel or other makeup.
Testee’s fingernail cannot be too long.
This device is not intended for treatment.
The User Manual is published by ReFleX Wireless Inc. All rights reserved.

IV
Contents
1. SAFETY..............................................................................................................................................6
1.1 OPERATION PROCEDURES.................................................................................................6
1.2 WARNING .........................................................................................................................6
1.3 CAUTIONS ........................................................................................................................7
2. INTRODUCTION..............................................................................................................................8
2.1 INTENDED USE .................................................................................................................8
2.2 KEY FEATURES.................................................................................................................8
2.2 APPLICATION AND SCOPE .................................................................................................8
2.3 ENVIRONMENT REQUIREMENTS .......................................................................................8
3. SYMBOLS, CONTROLS, DISPLAY, AND INDICATOR.............................................................9
3.1 FRONT PANEL...................................................................................................................9
3.2 REAR PANEL...................................................................................................................10
4. SETUP OF RX101............................................................................................................................11
4.1 LIST OF COMPONENTS....................................................................................................11
4.2 INACCURATE MONITOR MEASUREMENTS.......................................................................11
5. BATTERY OPERATION ................................................................................................................12
5.1 BATTERY POWER............................................................................................................12
5.2 BATTERY INDICATOR ......................................................................................................12
5.3 BATTERY CHARGING ......................................................................................................12
6. RX101 OPERATION.......................................................................................................................13
6.1 TURN ON RX101............................................................................................................13
6.2 MENU ACCESS................................................................................................................14
6.3 ADJUST LED DISPLAY BRIGHTNESS...............................................................................14
6.4 SET ALARM LIMIT..........................................................................................................15
6.5 ENABLE/DISABLE PULSE SOUND....................................................................................15
6.6 CHANGE USER ID.........................................................................................................16
6.7 ENABLE DATA RECORDING (UNDER REVISION) .............................................................16
6.8 ENABLE BLUETOOTH COMMUNICATION.........................................................................16
6.9 CHANGE SCREEN ORIENTATION .....................................................................................16
6.10 EXIT MENU ....................................................................................................................17
6.11 SOFTWARE OPERATION...................................................................................................17
6.12 CAUTIONS ......................................................................................................................17
6.13 CLINICAL RESTRICTIONS................................................................................................18
7. PERFORMANCE CONSIDERATION..........................................................................................19
7.1 DYSFUNCTIONAL HEMOGLOBINS ...................................................................................19
7.2 ANEMIA .........................................................................................................................19
7.3 SATURATION (SPO2).......................................................................................................19
7.4 PULSE RATE (PR)...........................................................................................................19
7.5 OTHER INACCURACY CAUSES ........................................................................................19
7.6 OTHER PULSE SIGNAL LOSS CAUSES .............................................................................19
7.7 TO USE RX101 PPG RECORDER.....................................................................................20
7.8 HIGH AMBIENT LIGHT SOURCES THAT CAN INTERFERE WITH THE PERFORMANCE OF RX101

V
PPG RECORDER ARE:..........................................................................................................................20
8. TROUBLESHOOTING...................................................................................................................21
8.1 CORRECTIVE ACTIONS ...................................................................................................21
8.2 EMI (ELECTROMAGNETIC INTERFERENCE)....................................................................21
8.3 TECHNICAL ASSISTANCE ................................................................................................22
9. MAINTENANCE .............................................................................................................................23
9.1 RETURN RX101 .............................................................................................................23
9.2 TO RETURN THE RX101 .................................................................................................23
9.3 SERVICE .........................................................................................................................23
9.4 PERIODIC SAFETY CHECKS.............................................................................................23
9.5 CLEANING......................................................................................................................23
10. MENU STRUCTURE .................................................................................................25
12. SPECIFICATIONS .....................................................................................................27
13. KEY SYMBOLS..........................................................................................................28
14. DEVICE FUNCTIONS...............................................................................................29
APPENDIX ...........................................................................................................................................30

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1. Safety
1.1 Operation Procedures
Check the main unit and all accessories periodically to look for visible damages that may affect
patient’s safety and monitoring performance. It is recommended that the device be inspected
once a week, and when a damage is observed, stop using the device.
Technical maintenance must be performed by qualified service engineers ONLY.
The device cannot be used together with devices not specified in the User Manual. Only the
accessories appointed or recommended by the manufacturer can be used with this device.
The product is pre-calibrated at the factory.
1.2 Warning
Warnings are identified by the WARNING symbol shown above.
Warnings alert the user to potential serious outcomes, such as death, injury, or adverse events to
the user.
Explosive hazard—DO NOT use the PPG Recorder in environment with inflammable gas such
as some ignitable anesthetic agents.
DO NOT use the PPG Recorder while the testee is measured by MRI and CT.
DO NOT strand the lanyard in order to avoid device drop and damage. The lanyard is made of
non-sensitive material. Please do not use lanyard if the user is allergic to lanyard. Do not
enwind neck with lanyard in order to avoid accident.
Follow the local laws and regulations when disposing a defective instrument, its accessories
and packaging (including battery, plastic bags, foams and paper boxes).
Please ensure that all items are present in the package prior using the device.
Only use accessories and probe approved or manufactured by the manufacturer to prevent
damages to the PPG Recorder.
Please choose the battery chargers that are compliant with the requirements of IEC 60601-1
People who are allergic to rubber cannot use this device.
RX101 is not defibrillator-proof. However, it may remain attached to the testee’s finger
throughout defibrillation or while an electrosurgical unit is in use. The measurements may be
inaccurate throughout the defibrillation, or use of an electrosurgical unit, and shortly thereafter.
To avoid shock, caregiver should not hold RX101 while using a defibrillator on a person.
To ensure accurate performance and prevent device failure, do not subject RX101 to extreme
moisture, such as direct exposure to rain. Such exposure may cause inaccurate performance or
device failure.
Please do not use the device during charging.
This device can only be matched with compatible probe.

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1.3 Cautions
Cautions are identified by the CAUTION symbol shown above.
Cautions alert the user to exercise care necessary for the safety and effective use of RX101
handheld PPG Recorder.
All combinations of equipment must be in compliance with IEC Standard 60601-1-1 systems
requirements.
Keep the PPG Recorder away from dust, vibration, corrosive substances, explosive materials,
hightemperature and moisture.
If the PPG Recorder gets wet, please stop operating it.
If the device was previously stored in cold environment, please wait for the device to accustom
to the environment before using.
DO NOT operate the button on front panel with sharp materials.
High temperature or high pressure steam disinfection of the PPG Recorder is not permitted.
Refer to User Manual in the relative chapter (10.5) for instru ctions of cleaning and
disinfection.
Do not have the PPG Recorder immerged in liquid. When it needs cleaning, please wipe its
surface with medical alcohol by soft material. Do not spray any liquid on the device directly.
When cleaning the device with water, the temperature should be lower than 60oC.
If the testee’s finger is too thin or cold. The readings may not be accurate. Please clip the PPG
Recorder on the thicker finger such as thumb or middle finger with sufficient depth to obtain
better reading.
The PPG Recorder is designed for adult measurements only.
Proper measurement should take less than 5 seconds; how this may change depending on each
individual’s pulse rate.
Please take the measurement when the waveform on screen becomes stabilized to ensure the
accuracy of the readings.
If some abnormal conditions appear on the screen during test process, remove the PPG
Recorder from the finger and then re-clip the recorder on the finger to reset the reading on the
display.
The device has normal useful life of three years counting from its first day of use.
This device has an alarm function. Please refer to chapter 6.4 for reference.
The device has audible alert which is sounded when the highest or lowest limit are reached.
The device has the function of alarming, this function can either be paused, or closed (default
setting). To access the device MENU please refer to chapter 6.1 for reference.
The device may not obtain accurate readings on all users.
When the device is connected with USB cable, always pick up the device itself and do not hold
it by the USB cable.
Stopping using the device if the device is unable to obtain stable readings.

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2. Introduction
WARNING: Do not make any clinical judgments based on RX101. The monitor is
intended only for health and wellness applications.
2.1 Intended Use
The pulse oxygen saturation is the percentage of HbO2in the total Hb in the blood, also known as the
O2concentration in the blood. It is an important bio-parameter for the respiration. In addition to O2
Saturation, the device can also measure heart rate and record the heart waveform (AKA
photoplethysmogram). The device brings excellent value for scientific research, education, and
health and wellness applications.
To operate the PPG Recorder, simply clip the recorder on a finger and the photoplethysmogram, heart
rate and oxygen saturation will display on the LED screen of the device.
2.2 Key Features
A. Easy to operate using the Home Button located next to the LED screen.
B. Rechargeable battery
C. Low power consumption
D. Support wireless data transmission of heart rate, Oxygen Saturation and heart waveform
(photoplethysmogram)
2.2 Application and Scope
The PPG Recorder measures oxygen saturation and pulse rate through a person’s fingers and toes (in
some cases). It is designed to be used in scientific research, education, health and wellness
applications.
Warning: The problem of over-estimation may occur when the person is suffering from
toxicosis which is caused by carbon monoxide. Thus, the device is not recommended to be used
under this circumstance.
2.3 Environment Requirements
Storage Environment
a) Temperature :-40oC~+60oC
b) Relative humidity :5%~95%
c) Atmospheric pressure :500hPa~1060hPa
Operating Environment
a) Temperature:10oC ~40oC
b) Relative Humidity :30%~75%
c) Atmospheric pressure:700hPa~1060hPa

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3. Symbols, Controls, Display, and Indicator
3.1 Front Panel
This section identifies the symbols, controls, displays, and indicators on RX101.
Figure 1: RX101 Front Panel
Table 1: RX101 Front Panel Description
Index
Name
Description
1
SpO2Lower Limit
Lower Limit Alarm Threshhold (set in the Alarm Menu)
2
Home Button
Use this button for Powering Up, change Screen Orientation,
Scroll Down and other features
3
SpO2
Oxygen Saturation Reading
4
Alarm Indicator
To indicate if the alarm is on, off or temporarily muted
5
Pulse Beat Sound
To indicate if the pulse beat sound is on/off
6
Battery Indicator
To show the current battery status
7
Charging Indicator
The Blue LED indicates the device is charging
8
Wireless Indicator
To indicate if Bluetooth is on.
9
Pulse Rate
To indicate the number of pulse per minute
10
Pulse Amplitude
To indicate the normalized pulse strength
11
Waveform Screen
To show the photoplethysmogram (Heart Waveform)

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3.2 Rear Panel
Figure 2: RX101 Back Panel
Table 2: RX101 Back Panel Description
Index
Name
Description
1
USB Port
For battery charging or attaching external sensor probe
2
Through Hole
For lanyard installation
3
Device Label
The label contains the technical specifications, manufacturing
details and certification information.
4
Speaker Hole
The is where the alarm speaker is mounted.

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4. Setup of RX101
WARNING: To ensure patient safety, do not place RX101 in any position that might
cause it to fall on the patient.
WARNING: As with all medical equipment, carefully route patient’s cables to reduce
the possibility of patient entanglement or strangulation.
WARNING: Ensure that the speaker is clear of any obstruction and that the speaker holes
are not covered. Failure to do so could result in an inaudible alarm tone.
WARNING: To ensure accurate performance and prevent device failure, do not subject
RX101 to extreme moisture, such as direct exposure to rain. Such exposure may cause
inaccurate performance or device failure.
4.1 List of Components
Table 3: List of Components
Quantity
Name
Description
1
RX101 PPG Recorder
A finger PPG Recorder
1
USB Cable
For charging RX101
1
Lanyard
To wear the PPG Recorder as a pendant
1
Instruction Manual
The instruction manual is included in the mini-CD or is
downloadable on www.reflexwireless.com
1
Quick Start Guide
This is a simplified version of the instruction manual
4.2 Inaccurate Monitor Measurements
Physiological conditions, medical procedures, or external agents that may interfere with the
PPG Recorder’s ability to detect and display accurate measurements include:
incorrect application of RX101 PPG Recorder
placement of RX101 record clip on an extremity with a blood pressure cuff, arterial
catheter, or intravascular line
excessive patient activity
intravascular dyes, such as indocyanine green or methylene blue
externally applied coloring agents, such as nail polish, dye, or pigmented cream

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5. Battery Operation
WARNING: Dispose of battery in accordance with local ordinances and regulations.
5.1 Battery Power
RX101 uses rechargeable Lithium Polymer battery to power the PPG Recorder. Depending on
usage, the battery can last from 5 hours to 40 hours per charge cycle. The battery will drain
faster if the Bluetooth connectivity is switched on.
5.2 Battery Indicator
Below are the five battery statuses:
WARNING: If the alarm function is on, the device will provide high-priority alarm signal
when the battery is in low power status. Intermittent alarm will occur and the battery icon
turns red in the state of flashing. High priority indicats that immediate response by the
operator is required.
5.3 Battery Charging
There are two battery charging methods:
a) Connect the device to a computer using the USB Cable.
b) Connect the device to the enclosed DC power adaptor using the USB Cable
Power supply by battery only, and battery status is full
Battery status is not full
Battery status is at the verge of self-shutdown
Low power alarm indicator
Charging Indicator (behind lanyard through hole)

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6. RX101 Operation
The parameters of RX101 are set at the factory according to Table 2. The parameters can be
customized for each individual user.
Parameters remain in effect until changed by the user.
Table 5: Default Parameter Settings
Parameter
Value Range
Default
%SpO2 Upper Alarm Limit
85~100
99
%SpO2 Lower Alarm Limit
0~99
85
Pulse Rate Upper Alarm Limit
50~254
150
Pulse Rate Lower Alarm Limit
0~150
50
Alarm
On/Off
Off
Pulse Beep
On/Off
Off
LED Display Brightness
1~4
3
Data Recording
On/Off
Off
Wireless
On/Off
Off
ID
Any four alpha numeric characters
(can only be set using RX101 software)
User
6.1 Turn on RX101
6.1.2 Discussion
The software version appears in the monitor display each time when it successfully completes
the power-on self-test. Write the number down so it is available when you request technical
assistance.
Caution: During the Power-On-Self-Test immediately after power-up, confirm that the
LED display and icons are shown and the monitor speaker sounds a one-second tone.
WARNING: If do not hear the pass tone, do not use RX101
6.1.2 Procedure
1. Press the Home Button for two seconds
2. See the opening screen with the software version number located on the
lower right hand corner
3. Wait for 60 seconds for the data to become stabilized if the device has not
been used for over two hours.
Auto-shut off
4. The device will shut-off automatically after 3 seconds of inactivity.

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Figure 3: Clip the PPG Recorder on the Forefinger
To obtain good reading, always try clipping the sensor on the forefinger first. If unable to obtain
readings, try clipping the sensor on the thumb to increase contact area between the sensor and
the body part.
6.2 MenuAccess
Press the “Home Button” as shown in figure 1 (page 4) for 2 seconds to access the Settings menu.
This area allows users to modify various device settings, such as alarm, pulse indicator, backlight,
data storage, and user ID ….The procedure is as follows:
Figure 4: Settings Menu
6.3 Adjust LED Display Brightness
Press the “Home Button” for 2 seconds to enter the Settings Menu. Brightness is lighted with a blue
rectangular bar indicating the menu item is currently selected. Push the “Home Button” again for
two seconds to adjust the brightness to the next level. The brightness level will rotate from 1 to 4 for
each two seconds the Home Button is pushed.
If only push the “Home Button” for 1 quick second, the menu selection bar (the blue
rectangular bar) will move to the next menu item. If this occurs, please give a few
consecutive quick pushes on the “Home Button” to return the menu selector back to
“Brightness”
To exit the Settings Menu, simply give the “Home
Button” a few quick pushes until the menu selector
highlights “Exit”, and then push the “Home Button”
for two seconds to exit the menu.
Figure 5: Exit Settings Menu

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6.4 SetAlarm Limit
Press the “Home Button” for 2 seconds to enter the Settings Menu. Brightness is lighted with a blue
rectangular bar indicating the menu item is currently selected. Push the “Home Button” again for a
quick second to enter theAlarm Menu.
Figure 6: Alarm Menu Access
Figure 7: Alarm Settings Menu
By default, “Dir” is highlighted with its setting “down”. This sets the adjust direction in the
“decreasing mode” and allows user to adjust the Alarm Settings downward (ie from 099 to 098). To
change to increasing mode, push the “Home Button” for 2 seconds while the menu selector is on
“Dir”.
a. The Highest/LowestAlarm Limit Setting
Assuming the “Dir” setting is “down,”give the “Home Button” a few quick pushes to move the
menu selector to one of the menu items. Once the desired Alarm setting is highlighted, push the
“Home Button” for two seconds to decrease the alarm setting by 1 or push and hold the Home
Button to keep decreasing the Alarm setting until the desired number is reached.
To increase the Alarm setting, give the “Home Button” a few quick pushes until the menu selector
highlights “Dir” and then pushes the “Home Button” for two seconds to set the adjust direction to
“Up”. Give the “Home Button” a few quick pushes to move the menu selector to the desired Alarm
setting, and then push and hold the “Home Button” to increase the Alarm setting.
Warning: If the alarm function is on, the device will provide medium-priority alarm signal
when the data of SpO2or pulse rate is beyond the limit. Intermittent alarm will occur and
the measurement shows in yellow.
Warning: Medium priority indicating that prompt operator response is required.
b. Enable/DisableAlarm
Give the “Home Button” a few quick pushes until the menu selector highlights “Alarm” and then
push the “Home Button” for two seconds to change the setting to “on” to turn on the Alarm Alert.
6.5 Enable/Disable Pulse Sound
Give the “Home Button” a few quick pushes until the menu selector highlights “Pulse Sound” and
then push the “Home Button” for two seconds to change the setting to “on” to turn on the Pulse

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Sound.
6.6 Change USER ID
The user can modify device ID by "AQWave". AQwave Software is currently available in Android
and PC. MAC and iOS version will be released in December 2012.
Figure 8: Set User ID
6.7 Enable Data Recording (Under Revision)
Figure 9: Record Data
6.8 Enable Bluetooth Communication
Turn on the Wireless Feature on the PPG Recorder by moving the menu selector to highlight
“Wireless” and then push the “Home Button”for 2 seconds to enable “Wireless”communication. To
connect to the PPG Recorder using your Android, iOS device or desktop computer, please follow the
instructions provided the mobile or PC application and use the passcode “7762” to have the data
from the PPG Recorder stream to the software applications.
Figure 10: Enable Wireless Communication
6.9 Change Screen Orientation
On the measuring interface, press the "Home Button" to change the display orientation.

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6.10 Exit Menu
To exit the Settings Menu, simply give the “Home Button” a few quick pushes until the menu
selector highlights “Exit”, and then push the “Home Button” for two seconds to exit the menu.
Figure 11: Exit the Settings Menu
6.11 Software Operation
Please connect the device with computer by a USB Cable or Bluetooth connection, and then follow
the instruction specified in the software applications. For Android applications, they can be
downloaded via Google Play (search keyword: AQWave). As for the PC software please download it
on www.aqwave.com.
6.12 Cautions
Please check if the device is functioning properly prior each use.
Attach the sensor probe at the appropriate locations, such as the one illustrated in figure 3 to
ensure device reading accuracy.
The SpO2sensor and photoelectric receiving tube should be arranged in a sequence such
that the subject’s arteriole is in between the light emitter and the light sensor.
The SpO2sensor should not be used at a location or limb tied with arterial canal or blood
pressure cuff or at a site where intravenous injection is applied.
Do not fix the SpO2sensor with adhesive as it may be affected by venous pulsation and
produces inaccurate measure of SpO2 and pulse rate.
Excessive ambient light may affect the measuring result. This includes fluorescent lamp,
dual ruby light, infrared heater, direct sunlight and etc.
Strenuous action of the subject or extreme electrosurgical interference may also affect the
accuracy of the sensor reading.
Please clean and disinfect the device after each use according to the User Manual.

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6.13 Clinical Restrictions
a) Since the measurement is taken on the basis of arteriole pulse, substantial pulsating blood
flow of subject is required. A subject with weak pulse due to shock, low ambient/body
temperature, major bleeding, or use of vascular contracting drug, the SpO2waveform
(PLETH) will decrease. In this case, the measurement will be more sensitive to interference.
b) For those with a substantial amount of staining dilution drug (such as methylene blue,
indigo green and acid indigo blue), or carbon monoxide hemoglobin (COHb), or methionine
(Me+Hb) or thiosalicylic hemoglobin, and some with icterus problem, the SpO2
determination by this monitor may be inaccurate.
c) The drugs like dopamine, procaine, prilocaine, lidocaine and butacaine may also be a major
factor resulted in serious error of SpO2measure.
d) As the SpO2value serves as a reference value for judgment of anemic anoxia and toxic
anoxia, some people with serious anemia may also report good SpO2measurement.

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7. Performance Consideration
WARNING: PPG Recorder readings and pulse signals can be affected by ambient
environmental conditions, OXIMAX sensor application errors, and patient conditions.
This section describes patient conditions that can affect the PPG Recorder’s measurements.
7.1 Dysfunctional Hemoglobins
Dysfunctional hemoglobins, such as, carboxyhemoglobin, methemoglobin, and sulfhemoglobin, are
unable to carry oxygen. SpO2 readings may appear normal; however, a person may be hypoxic
because less hemoglobin is available to carry oxygen. Further assessment beyond PPG Recorder is
recommended.
7.2 Anemia
Anemia causes decreased arterial oxygen content.Although SpO2 readings may appear normal, an
anemic person may be hypoxic. Correcting anemia can improve arterial oxygen content. The PPG
Recorder may fail to provide a SpO2 reading if hemoglobin levels fall below 5 gm/dl.
7.3 Saturation (SpO2)
The monitor displays saturation levels between 1% and 99%.
7.4 Pulse Rate (PR)
The monitor displays pulse rates between 30 and 250 beats per minute. The sensor accuracy ranges
do not apply to pulse rates above 230 bpm. Detected pulse rates below 30 are shown as 0.
7.5 Other Inaccuracy Causes
• incorrect application of the PPG Recorder
• placement of the PPG Recorder on an extremity with a blood pressure cuff, arterial catheter, or
intravascular line
• excessive patient activity
• intravascular dyes, such as indocyanine green or methylene blue
• externally applied coloring, such as nail polish or pigmented cream
• venous pulsation
• dysfunctional hemoglobin
• low perfusion
7.6 Other Pulse Signal Loss Causes
• testee’s finger not inserted into the PPG Recorder sufficiently
• defibrillation
• a blood pressure cuff is inflated on the same extremity as the one with the PPG Recorder attached
• there is arterial occlusion proximal to the PPG Recorder
• poor peripheral perfusion
• loss of pulse/cardiac arrest

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7.7 To use RX101 PPG Recorder
• Apply the sensor as directed, and observe all warnings and cautions presented in the Directions
• Clean and remove any substances, such as nail polish, from the application site.
• Periodically check to ensure that the PPG Recorder remains properly positioned on the testee’s
finger.
7.8 High ambient light sources that can interfere with the performance of RX101 PPG
Recorder are:
• surgical lights (especially those with a xenon light source)
• bilirubin lamps
• fluorescent lights
• infrared heating lamps
• direct sunlight
7.9 To prevent interference from ambient light, ensure that the PPGRecorder is properly
applied. If interference due to testee’s activity presents a problem, try one or more of the
following to correct the problem:
• verify that RX101 PPG Recorder is properly and securely applied
• move the PPG Recorder to another site
• keep the testee still, if possible