Sherwood Scuba Wisdom 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.
Responsible

3
WISDOM
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 can be
used for Air dives or Nitro dives. For clarity, these terms are defined as -
Breathing Gas - the gaseous mi ture breathed during a dive.
Air - a breathing gas that contains appro imately 21% o ygen and 79% nitrogen (nature's common nitrogen-o ygen mi ture).
Nitro - a nitrogen-o ygen breathing gas that contains a higher fraction of o ygen (22 to 50%) than air.

4
W RNINGS:
 The WISDOM 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 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.
 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
LIMITED TWO-YEAR WARRANTY
Sherwood Scuba guarantees, to the original purchaser only, that the WISDOM 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 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 to an Authorized Sherwood Dea er within 30 days of the origina purchase date anniversary to
keep the two year imited warranty 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 - Genera :
Warranty does not cover damage from accident, abuse, battery eakage, tampering, ack of proper care and maintenance and/or proper annua
servicing, or improper use of the WISDOM. Modifications or repair by anyone other than a Sherwood Sales and Service Center authorized to service
the WISDOM 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 sa e of the WISDOM to you, you agree and understand that in no event wi Sherwood Scuba,
its distributors or retai ers, be he d iab e for any persona injuries resu ting from its operation, or for any other damages whether direct, indirect,
incidenta , or consequentia even if Sherwood 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 p astic 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 reduced
to any electronic medium or machine readable form without prior consent in writing from Sherwood Scuba LLC / 2002 Design
WISDOM Owner's Manua , Doc. No. 12-2340
© 2002 Design 2002
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 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 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 dive computer model is based upon the latest research and experiments in
decompression theory Sti , using the WISDOM, just as using the U.S. Navy (or other) No Decompression Tab es, 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
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 (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
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
Operational Dive Modes 70
No Decompression Dive Mode 70
 No Deco Safety Stop 72
Digital Gauge Mode 73
High PO2 Dive Mode 74
High O2 Dive Mode 75
Decompression Dive Mode 76
Conditional Violation 78
Delayed Violations 79
Permanent Violation/Gauge Mode 81
CARE and MAINTENANCE ......................................................................................................................... 83
Care and Cleaning 84
Inspections and Service 85
Battery Replacement 86
REFERENCE MATERIAL ............................................................................................................................. 89
Decompression Model 90
Tissue Compartment Control 90
No Decompression Limits 90
Oxygen Exposure Limits 91
Altitude Diving 93
Flying After Diving 94
Clear (Reset) Feature 96
Specifications 97
Glossary 103
Inspection/Service Record 105

11
WISDOM
FEATURES
and
DISPLAYS

12
INTRODUCTION
Congratulations on your recent purchase of the Sherwood WISDOM dive computer!
Your new WISDOM 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 e pect it to be.
In addition to no-decompression/decompression status, tissue loading of nitrogen, accumulation of o ygen, and ascent rate are
presented as peripheral bar graphs alongside color coded 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'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, 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
FEATURES AND DISPLA S
The WISDOM 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's unique Menu Sys-
tem that allows -
 selection of 3 Main Operating Modes (Air, Nitro , 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 download to a PC 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
ALARM LED
a
b

14
INTUITIVE DISPL YS
The WISDOM uses 4 rows of easy to understand alpha/numeric displays and graphic icons (Fig. 2).
For e ample, 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. They are color coded Green, Yellow, and Red representing
Normal, Caution, and Danger zones.
It is imperative that you understand the formats, ranges, and values of the information presented by
the WISDOM's numeric and graphic displays to avoid any possible misunderstanding that could re-
sult in an error.
B R GR PHS
Nitrogen Bar Graph
The Nitrogen 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
CNS
CNS
O2
DECO
DECO
N2
ALARM LED
a
PSI
BAR
FEET
G
A
S
TIME-STOP
DIVE
FEET
METERS
MAXIMUM
DESAT
TOTAL ASCENT
NITROX
NITROX
AIR
AIR
GAUGE
GAUGE
ALARM LED
FO2%
SAFEMINUTES
METERS
SURFACE
L
O
W

15
WISDOM
CNS
CNS
O2
O2
DECO
DECO
N2
N2
ALARM LED
The Nitrogen Bar Graph monitors 12 different nitrogen compartments simultaneously and displays
the one that is in control of your dive. It is divided into a green No Decompression (normal) zone, a
yellow Caution zone (also No Decompression), and a red 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, e cessive weight, etc., to reduce
the statistical risk.
Oxygen ccumulation Bar Graph (O2BG)
The O2 Bar Graph (Fig. 4a) represents o ygen loading, your relative o ygen tolerance dosage (OTU),
showing the ma imum of either per dive accumulated o ygen, or 24 hour period accumulated o y-
gen. 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 e -
posure 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). Green is a 'normal' rate, yellow a 'cautionary' rate, and red is 'Too Fast'. The
segments of the Variable Ascent Rate Indicator represent 2 sets of speeds which change at a refer-
ence 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
DIVE
FEET
MAXIMUM
NITR
NITR
OX
O2
O2
N2
N2
ALARM LED
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 unique 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 dis-
played 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 dis-
played (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 'e tended' 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
PSI
TIME
TIME
NITR
NITR
OX
O2
O2
N2
N2
ALARM LED
SURF
SURF
ACE
CE
PSI
FEET
G
A
S
TIME
MAXIMUM
N2
N2
ALARM LED
SAFEMINUTES
AIR
AIR
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
projections (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 e ceeds
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
b
c
Fig 6 - Time & Date
N

18
UDIBLE L RM
Alarms are listed on the ne t page.
When Reminder Alarm situations activate the Alarm, the unit will emit a quick double beep each second for 10 seconds, or
until 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
Reminder Alarm situations include -
 PO2 equal to or greater than 1.60 ATA, or the Ma PO2 Alarm setting.
 Descent deeper than the Ma 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 e ceeds 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
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 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
PSI
TIME
NITR
NITR
OX
O2
O2
N2
N2
ALARM LED
SURFACE
L
O
W
a