Sherwood Scuba Wisdom 2 User manual

2
RESPONSIBLE COMPUTER DIVING
Always Plan Each Dive
Always Limit our Dive to the Level of our
Training and Experience
Always Make our Deepest Dive First
Always Make The Deepest Part Of Every Dive First
Check our Computer Often During the Dive
Do A Safety Stop On Every Dive
Allow Adequate Surface Interval Between Each Dive
Allow Adequate Surface Interval Between Each Day Of
Diving (12 Hours Or Until our Computer Clears)
Read And Understand This Owner's Manual
Thoroughly Before Using the WISDOM 2.
Responsible

3
WISDOM 2
The following symbols are used throughout this manual to bring your attention to situations that require
special consideration. Be sure to read and follow all instructions carefully.
A NOTE is used to emphasize an important maintenance technique.
A C UTION is used before a maintenance technique that will result in damage to parts if
that technique is not followed carefully.
A W RNING is used before a procedure that will result in serious injury or death if the
procedure is not followed carefully.
N
Throughout this owner's manual reference is made to the term 'breathing gas'. The rationale being that the WISDOM 2 can be
used for Air dives or itrox dives. For clarity, these terms are defined as -
Breathing Gas - the gaseous mixture breathed during a dive.
Air - a breathing gas that contains approximately 21% oxygen and 79% nitrogen (nature's common nitrogen-oxygen mixture).
itrox - a nitrogen-oxygen breathing gas that contains a higher fraction of oxygen (22 to 50%) than air.

4
W RNINGS:
 The WISDOM 2 is intended for use by recreational divers who have successfully
completed a nationally recognized course in scuba diving, and diving with enriched
nitrogen-oxygen (nitrox) breathing gas mixtures.
 It is intended only for no decompression diving, NOT intentional decompression diving.
 It must not be used by untrained persons who may not have knowledge of the potential
risks and hazards of scuba diving, and diving with enriched nitrogen-oxygen (nitrox)
mixtures.
 You must obtain scuba certification, and certification in diving with enriched nitrogen-
oxygen mixtures (nitrox) before using the WISDOM 2 if you have not already done so.
 It is NOT for use by military and commercial divers.
 It should NOT be utilized for any competitive, or repetitive square wave or
decompression diving, as it is intended solely for recreational use and no decompression
multilevel diving.
 s with all underwater life support equipment, improper use or misuse of this product
can cause serious injury or death.
 Never participate in sharing or swapping of a dive computer.
 Conduct your dives in such a manner so as to insure that you continuously check the
computer's proper function.
 Read and understand this owners manual completely before diving with the WISDOM 2.
 If you do not fully understand how to use this dive computer, or if you have any
questions, you should seek instruction in its use from your uthorized Sherwood Scuba
Dealer before you utilize this product.

5
WISDOM 2
LIMITED TWO-YEAR WARRANTY
Sherwood Scuba guarantees, to the original purchaser only, that the WISDOM 2 will be free of defects in materials and/or craftsmanship under normal
recreational multilevel scuba use for two years from date of purchase, provided proper care and annual service are performed as described within
this owner s guide. Should your WISDOM 2 prove to be defective for any reason (other than those listed in the limitations section below) it will be
repaired or replaced (at Sherwood Scuba's discretion) free of charge excluding shipping and handling charges.
This warranty will be considered void if the registration card is not filled out completely at the time of purchase and mailed to Sherwood Scuba within
30 days of purchase, and/or if the annual inspection is not done according to this owner s manual. This warranty is non-transferrable and applies to
the original purchaser only. All correspondence concerning this warranty must be accompanied by a copy of the original sales receipt and a copy of
the owner s portion of the warranty registration card including the annual inspection record.
Once each year you must return the WISDOM 2 to an Authorized Sher ood Dealer ithin 30 days of the original purchase date anniversary
to keep the t o year limited arranty in force. Annual inspection includes verification of depth accuracy and proper general function. Labor charges
for the annual inspection are not covered by the warranty. You must provide a copy of the original sales receipt and a copy of the owner s portion of
the warranty registration card including the annual service record to obtain warranty service.
Statement of Limitations - General:
Warranty does not cover damage from accident, abuse, battery leakage, tampering, lack of proper care and maintenance and/or proper
annual servicing, or improper use of the WISDOM 2. Modifications or repair by anyone other than a Sherwood Sales and Service Center authorized
to service the WISDOM 2 will void the warranty. Sherwood Scuba will not be responsible for recovery or replacement of the product in the event of
loss or theft. Sherwood Scuba, its distributors, and retailers make no warranties, either expressed or implied, with respect to this product or its owner s
manual except those stated in the preceding paragraphs. In consideration of the sale of the WISDOM 2 to you, you agree and understand that
in no event ill Sher ood Scuba, its distributors or retailers, be held liable for any personal injuries resulting from its operation, or for any
other damages hether direct, indirect, incidental, or consequential even if Sher ood Scuba is advised of such damages.
Some states do not allow the exclusion or limitation of implied warranties or liabilities for incidental or consequential damages, so the above limitation
may not apply to you.
Warranty does not extend to the plastic gauge face, o-rings, batteries, or damage due to accident, abuse, modification, or tampering.

6
COPYRIGHT NOTICE
This owner s manual is copyrighted, all rights are reserved. It may not, in whole or in part, be copied, photocopied, reproduced, translated, or re-
duced to any electronic medium or machine readable form without prior consent in writing from Sherwood Scuba LLC / 2002 Design.
WISDOM 2 O ner's Manual, Doc. No. 12-2739
© 2002 Design, 2006
TRADEMARK NOTICE
Sherwood Scuba, the Sherwood Scuba logo, and HydroGlo are registered or unregistered trademarks of Sherwood Scuba LLC. Wisdom and
the Wisdom logo are trademarks of Sherwood Scuba LLC. All rights are reserved.
PATENT NOTICE
U.S. Patents, registered in the U.S. Patent and Trademark Office, have been issued to protect the following design features:
Data Sensing and Processing Device (U.S. Patent no. 4,882,678), Dive Time Remaining (U.S. Patent no. 4,586,136), and Ascent Rate Indicator
(U.S. Patent no. 5,156,055).
DECOMPRESSION MODEL
The programs within the WISDOM 2 simulate the absorption of nitrogen into the body by using a mathematical model. This model is merely a way
to apply a limited set of data to a large range of experiences. The WISDOM 2 dive computer model is based upon the latest research and experiments
in decompression theory. Still, using the WISDOM 2, just as using the U.S. Navy (or other) No Decompression Tables, is no guarantee of
avoiding decompression sickness (i.e., the bends). Every diver s physiology is different, and can even vary from day to day. No machine can
predict how your body will react to a particular dive profile.

7
WISDOM 2
CONTENTS
Warranty ......................................................................................................................................................... 5
Notices ............................................................................................................................................................ 6
FEATURES and DISPLAYS ......................................................................................................................... 11
Introduction ................................................................................................................................................... 12
Features and Displays .................................................................................................................................. 13
Intuitive Displays ........................................................................................................................................... 14
Bar Graphs ................................................................................................................................................... 14
Nitrogen Bar Graph ................................................................................................................................... 14
Oxygen (O2) Bar Graph ............................................................................................................................ 15
Variable Ascent Rate Indicator ................................................................................................................. 15
Informational Displays .................................................................................................................................. 16
Tank Pressure Display .............................................................................................................................. 16
Depth Displays .......................................................................................................................................... 16
Time and Date Displays ............................................................................................................................ 17
Temperature Display ................................................................................................................................. 17
Audible Alarm ................................................................................................................................................ 18
Backlight ....................................................................................................................................................... 20
Power Supply ................................................................................................................................................ 20
Operating Temperature ................................................................................................................................. 21
Sharing the Wisdom ..................................................................................................................................... 22
Responsible

8
CONTENTS (CONTINUED)
ACTIVATION AND SETUP ........................................................................................................................... 23
Activation ...................................................................................................................................................... 24
Push Button .............................................................................................................................................. 24
Water Contact ........................................................................................................................................... 24
Diagnostic Mode ....................................................................................................................................... 25
Surface Screens ........................................................................................................................................... 25
Time Screen .............................................................................................................................................. 25
Time/Wet Screens .................................................................................................................................... 26
Data Screens ............................................................................................................................................ 27
Plan Screens ............................................................................................................................................ 29
Last Dive Screen ...................................................................................................................................... 32
Log Mode .................................................................................................................................................. 33
History Mode ............................................................................................................................................. 36
Simulator ................................................................................................................................................... 37
PC Mode (Upload/Download) ................................................................................................................... 41
Entering Settings .......................................................................................................................................... 42
Set 1 Group (Modes/Basics) .................................................................................................................... 43
 Set Operating Mode ............................................................................................................................ 43
 Set PO2 Alarm Value ........................................................................................................................... 45
 Set FO2 Value ..................................................................................................................................... 46
 Set FO2 Default On/Off ....................................................................................................................... 47

9
WISDOM 2
CONTENTS (CONTINUED)
Set 2 Group (Alarms) ................................................................................................................................ 48
 Set All Alarms On/Off ........................................................................................................................... 48
 Set Ascent Alarm On/Off...................................................................................................................... 49
 Set Depth Alarm On/Off ....................................................................................................................... 50
 Set Depth Alarm Value ........................................................................................................................ 51
 Set Turn Pressure Alarm On/Off .......................................................................................................... 52
 Set Turn Pressure Alarm Value ........................................................................................................... 53
 Set End Pressure Alarm On/Off .......................................................................................................... 54
 Set End Pressure Alarm Value ............................................................................................................ 55
 Set Reserve Time Alarm On/Off .......................................................................................................... 56
 Set Reserve Time Alarm Value ............................................................................................................ 57
 Set Deco Alarm On/Off ........................................................................................................................ 58
 Set PO2 Alarm On/Off ......................................................................................................................... 59
Set 3 Group (Utilities) ............................................................................................................................... 60
 Set Wet Activation On/Off .................................................................................................................... 60
 Set Units of Measure ........................................................................................................................... 61
 Set Sample Rate Value ....................................................................................................................... 62
Set 4 Group (Date/Time) .......................................................................................................................... 63
 Set Hour Format .................................................................................................................................. 63
 Set Hour/Minute ................................................................................................................................... 64
 Set Year/Month/Day ............................................................................................................................. 66

10
CONTENTS (CONTINUED)
DIVE MODES ............................................................................................................................................... 69
Dive Time Remaining.................................................................................................................................... 70
Operational Dive Modes ............................................................................................................................... 73
No Decompression Dive Mode ..................................................................................................................... 73
No Deco Safety Stop .................................................................................................................................... 75
Digital Gauge Mode ...................................................................................................................................... 76
High PO2 Dive Mode .................................................................................................................................... 77
High O2 Dive Mode ...................................................................................................................................... 78
Decompression Dive Mode .......................................................................................................................... 79
Violation Modes ............................................................................................................................................ 81
CARE and MAINTENANCE ......................................................................................................................... 85
Care and Cleaning ........................................................................................................................................ 86
Inspections and Service ............................................................................................................................... 87
Battery Replacement .................................................................................................................................... 88
REFERENCE MATERIAL ............................................................................................................................ 91
Decompression Model .................................................................................................................................. 92
Tissue Compartment Control ........................................................................................................................ 92
No Decompression Limits ............................................................................................................................. 92
Oxygen Exposure Limits ............................................................................................................................... 93
Altitude Diving ............................................................................................................................................... 95
Flying After Diving ......................................................................................................................................... 96
Clear (Reset) Feature ................................................................................................................................... 98
Compass Removal/Installation Instructions ................................................................................................. 99
Specifications .............................................................................................................................................. 100
Glossary ...................................................................................................................................................... 106
Altitude NDL Tables .................................................................................................................................... 107
Inspection/Service Record .......................................................................................................................... 110

11
WISDOM 2
FEATURES
and
DISPLAYS

12
INTRODUCTION
Congratulations on your recent purchase of the Sherwood WISDOM 2 dive computer!
Your new WISDOM 2 uses a unique and intuitive display that represents the information you need before, during, and after the
dive, laid out in a logical format based on a dive profile diagram. Information is located where you would expect it to be.
In addition to no-decompression/decompression status, tissue loading of nitrogen, accumulation of oxygen, and ascent rate are
presented as peripheral bar graphs alongside reference indicators.
As you progress through this instruction manual, you will become familiar with the unique functions and features available. A
symbol legend is provided on the last page of this section for your convenience.
The WISDOM 2's wide array of features are described in detail throughout the pages that follow.
The initial time that you invest becoming acquainted with the symbols and various operating modes and displays will be re-
turned as you enjoy your underwater activities with the comfort that your familiarization affords.
As you use the WISDOM 2, remember that the rules you learned in your SCUBA course(s) still apply to the diving you will do
while using a dive computer - some will become even more important. Technology is no substitute for common sense, and a
dive computer only provides the person using it with data, not the knowledge to use it.

13
WISDOM 2
FEATURES AND DISPLA S
The WISDOM 2 has two Control Buttons that allow you to activate the unit and access specific infor-
mation when you choose to see it. The Front button (Fig. 1a) is referred to as the Advance and the
Side button (Fig. 1b) as the Select.
While on the surface, you can use the buttons to maneuver through the WISDOM 2's unique Menu
System that allows -
 selection of 3 Main Operating Modes (Air, itrox, or Gauge)
 viewing of various information displays (Last Dive, Plan Depths/Times, Dive Logs, History,
etc.)
 entering of settings divided into 4 convenient categories (Basics, Alarms, Utilities, and Time)
 activation of the Backlight
 operation of an onboard Simulator
 setup for a PC interface program
During the Dive modes, the buttons may be used to -
 activate the display's Backlight
 view Alternate displays of information
 acknowledge Alarms
Fig. 1 - Control Buttons
a
b

14
PSI
BAR
FEET
TIME-STOP
DIVE
FEET
METERS
MAXIMUM
DESAT
TOTAL ASCENT
NITROX
NITROX
AIR
AIR
GAUGE
GAUGE
FO2%
SAFEMINUTES
METERS
SURFACE
L
O
W
G
A
S
CNS
CNS
O2
O2
DECO
DECO
N2
N2
INTUITIVE DISPL YS
The WISDOM 2 uses 4 rows of easy to understand alpha/numeric displays and graphic icons (Fig. 2).
For example, when you enter into Special Situations, such as Decompression, High PO2, and Out of
Range modes, an UP Arrow symbol will appear as a warning to ascend to a shallower depth.
It also utilizes 3 segmented Bar Graphs to provide you with quick visual reference of Decompression
status, O2 Saturation, and Ascent speed. Their segments represent ormal, Caution, and Danger
zones.
It is imperative that you understand the formats, ranges, and values of the information presented by the
WISDOM 2's numeric and graphic displays to avoid any possible misunderstanding that could result
in an error.
B R GR PHS
Nitrogen Bar Graph
The itrogen Bar Graph (Fig. 3a) represents tissue loading of nitrogen, showing your relative no de-
compression or decompression status. As your depth and bottom time increase, segments will add to
the Graph, and as you ascend to shallower depths, the Bar Graph will begin to recede, indicating that
additional no decompression time is allowed for multilevel diving.
Fig. 2 - Icons
Fig. 3 - Nitrogen BG
a

15
WISDOM 2
CNS
CNS
O2
O2
DECO
DECO
N2
N2
The itrogen Bar Graph monitors 12 different nitrogen compartments simultaneously and displays the
one that is in control of your dive. It is divided into a o Decompression (normal) zone, a Caution
zone (also o Decompression), and a Decompression (danger) zone.
While you cannot provide a guarantee against the occurrence of decompression sickness, you may
choose your own personal zone of caution based upon age, physique, excessive weight, etc., to reduce
the statistical risk.
Oxygen ccumulation Bar Graph (O2BG)
The O2 Bar Graph (Fig. 4a) represents oxygen loading, your relative oxygen tolerance dosage (OTU),
showing the maximum of either per dive accumulated oxygen, or 24 hour period accumulated oxygen.
As your accumulation (% saturation) increases during a dive or 24 hour period, segments will add to
the Bar Graph, and as loading decreases, it will begin to recede, indicating that additional exposure is
allowed.
NOTE: Displays associated with oxygen and the O2 Bar Graph will only appear
if FO2 has been set at a value other than ' ir' (e.g., a numerical value).
Variable scent Rate Indicator ( RI)
The Variable Ascent Rate Indicator (Fig. 4b) provides a visual representation of Ascent speed (i.e., an
ascent speedometer), 'normal' rate, a 'cautionary' rate, and 'Too Fast'. The segments of the Variable
Ascent Rate Indicator represent 2 sets of speeds which change at a reference depth of 60 feet (18
meters). Refer to the chart at the right for segment values.
Fig. 4 - O2BG & ARI
a
b
Variable Ascent Rate Indicator
Deeper than 60 feet (18 m)
Segments Ascent Rate =
Displayed FPM MPM
0 0-20 0 - 6
1 21-30 6.5-9
2 31- 0 9.5-12
3 1-50 12.5-15
51-60 15.5-18
5 >60 >18
60 feet (18 m) & Shallower
Segments Ascent Rate =
Displayed FPM MPM
0 0-10 0 - 3
1 11-15 3.5- .5
2 16-20 5-6
3 21-25 6.5-7.5
26-30 8-9
5 >30 >9
N

16
PSI
FEET
TIME-STOP
DIVE
FEET
MAXIMUM
NITROX
NITROX
O2
O2
N2
N2
SAFEMINUTES
W RNING: t depths greater than 60 feet (18 meters), scent Rates should
not exceed 60 feet per minute (18 meters per minute). t depths of 60 feet (18
meters) and shallower, scent Rates should not exceed 30 feet per minute (9
meters per minute).
INFORM TION L DISPL YS
Each numeric and graphic display represents a uni ue piece of information. It is imperative
that you understand the formats, ranges, and values of the information represented to avoid any
possible misunderstanding that could result in error.
Tank Pressure Display
Tank pressure is displayed numerically as the largest digits (Fig. 5a). Values of pressure are displayed
from 0 PSI (BAR) up to 5000 PSI (352 BAR) in increments of 5 PSI (.5 BAR).
Depth Displays
During a dive, the Current Depth display (Fig. 5b), indicates depths from 0 to 330 feet (99.9 meters)
in 1 foot (.1 meter) increments. The Maximum Depth reached during that dive will also be displayed
(Fig. 5c).
 When the unit is set to operate as a Digital Depth Gauge/Timer (referred to as Gauge Mode), the
Depth Display range is 'extended' to 399 feet (120 meters).
 At depths greater than 99.9 meters, it will indicate metric values in increments of 1 meter.
Fig. 5 - Pressure &
Depth
a
b
c

17
WISDOM 2
PSI
TIME
NITROX
NITROX
O2
O2
N2
N2
SURFACE
PSI
O2
O2
N2
N2
FEET
TIME
AIR
AIR
SAFEMINUTES
G
A
S
Time and Date Displays
Time displays are shown in hour:minute format (i.e., 1:09 represents 1 hour and 9 minutes, not 109
minutes!). The colon that separates hours and minutes blinks once per second when the display is in-
dicating real time (e.g., Elapsed Dive Time), and is solid (non-blinking) when times are calculated pro-
jections (e.g., Time to Fly).
The Main Time display is configured with the second largest digits of the LCD (Fig. 6a). A second
time display (Fig. 6b) provides additional Times such as Surface Interval and Elapsed Dive Time.
Date (Fig. 6c) is only displayed during select surface modes such as the TIME screen.
 Month always appears to the left of Day, even when set for Metric units.
Temperature Display
Ambient Temperature (Fig. 7a) is viewed as part of Alternate Displays. If the Temperature exceeds
a value of 99, 2 dashes ( - - ) will be displayed on the screen until the Ambient Temperature decreases
to 99.
NOTE: The Informational Displays are described in detail as the various
operating modes they appear in are presented throughout this manual.
Fig. 7 - Temperature
a
a
bc
Fig. 6 - Time & Date
N

18
UDIBLE L RM
Alarms are listed on the next page.
When Reminder Alarm situations activate the Alarm, the unit will emit a quick double beep each second for 10 seconds, or un-
til the situation is corrected, or it is acknowledged by pressing the Advance (Front) button.
When Cautionary Alarm situations activate the Alarm, the beep will be on for 1/2 second then off 1/2 second, repeating for 10
seconds, or until the situation is corrected, or it is acknowledged by pressing the Advance (Front) button.
Some Alarms cannot be acknowledged. These are differentiated by 1 beep per second for 10 seconds followed by a full 3 sec-
ond beep.
If an Alarm is acknowledged and the situation corrected, the Alarm will sound again if the situation occurs again, or another
Alarm situation occurs.
A single short beep is emitted after the Diagnostic check, upon automatic return to Surface Mode from Simulator Mode, upon
completion of a fast battery change with calculations/settings saved, and upon change from Delayed to Full Violation after that
dive.
A red LED Warning Light located on the lower/left portion of the module is synchronized with the Audible Alarm and will
flash when the Alarm sounds. A scrolling message will also be displayed in the upper portion of the screen. The LED will
turn OFF when the Alarm is acknowledged or Set OFF, however, the message will continue to scroll until the condition is
cleared. In the event that another Alarm situation occurs, its scrolling message will be displayed until it is acknowledged, at
which time it will be replaced by the message that was previously scrolling.

19
WISDOM 2
Reminder Alarm situations include -
 PO2 equal to or greater than 1.60 ATA, or the Max PO2 Alarm setting.
 Descent deeper than the Max Depth Alarm setting.
 Dive Time Remaining decreases to the Alarm setting.
 Tank Pressure decreases to the Turn Pressure Alarm setting.
Cautionary Alarm situations include -
 Entry into Decompression Mode
 O2 Accumulation equal to or greater than allowable per dive limit, or limit for a 24 hour period.
 Ascending above a required Decompression Stop Depth for less than 5 minutes.
 Ascent rate exceeds 60 feet (18 meters) per minute when depth is greater than 60 feet (18 meters), or 30 feet (9 meters)
per minute at 30 feet (9 meters) or shallower.
 Tank Pressure decreases to the End Pressure Alarm setting.
 Entry into Delayed or Full Violation modes (described later).
Situations in which the Alarm cannot be acknowledged include -
 Being above a required Decompression Stop Depth for more than 5 minutes.
 Being in Decompression that requires a Stop Depth much greater than 60 feet (18 meters).
 Being on the surface for 5 minutes without completing a Decompression obligation.

20
PSI
TIME
NITROX
NITROX
O2
O2
N2
N2
SURFACE
L
O
W
B CKLIGHT
To activate the HydroGlo® Backlight while viewing displays in the Surface Mode, press Both buttons
simultaneously.
To activate the Backlight while viewing displays Underwater, press the Front (Advance) button mo-
mentarily (< 2 seconds).
The screen will be illuminated for 10 seconds. Press the button(s) again to activate as desired.
The Backlight is disabled if the button(s) is held depressed longer than 10 seconds or during a Low
Battery Condition.
NOTE: Sherwood Scuba recommends that you carry primary and backup dive
lights when conducting dives that could include low light situations.
POWER SUPPL
The WISDOM 2 utilizes one (1) 3 volt, CR2450 Lithium Battery that should provide from 300 dive
hours of operation if you conduct one 1 - hour dive each time the unit is activated, to over 600 dive
hours of operation if you conduct two or more dives each time the unit is activated.
Battery Indicator
A Battery Indicator (icon) provides an indication of Low Battery Condition. The Battery Indicator
(Fig. 8a) will only appear on the Surface TIME (or WET), DATA, and FLY/SAT screens. It will not
be displayed on other surface display screens or during Dive Modes.
N
Fig. 8 - Low Battery
Condition
a