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DTT
DIGITAL TORQUE TESTER
TGT TORQUE: 250
DATA: 25
FIRST PEAK
0.0O
MAIN MENU
2503-F-DTT
25 - 250 FT.LB.
FT-LB
SETUP STORE
Page 2
Table of Contents
Important Safety Instructions ..................................................................................
DTT System Components .............................................................................................
Introduction ...................................................................................................................
Functional Description ..................................................................................................
Specifications ...............................................................................................................
Transducer Range and Display Resolutions ..........................................................
Setup ....................................................................................................................
Mounting .......................................................................................................
Tester Set-up ................................................................................................
Tests ....................................................................................................................
Quick Check Mode ........................................................................................
Audit Mode ....................................................................................................
Data Offload ..................................................................................................
1
4
5
6
8
9
10
10
11
12
13
16
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DTT Digital Torque Tester
IMPORTANT SAFETY INSTRUCTIONS
This manual contains important safety and operating
instructions for the Digital Torque Tester (DTT).
Read All Instructions
Read, understand and follow all safety messages and
instructions in this manual and on the test equipment.
Safety messages in this section of the manual contain a
signal word, a three-part message, and, in some
instances, an icon. An icon, when present, gives a
graphical description of the potential hazard.
General Cautions
CDI Torque Products cannot anticipate or provide
safety warnings and cautions to cover every situation that
may be encountered when operating, servicing or
repairing this tester. It is the responsibility of operators
and servicing technicians to be knowledgeable about the
procedures, tools and materials used, and to satisfy
themselves that the procedures, tools and materials will
not compromise their safety.
Do not attempt to operate this Digital Torque Tester
until you have thoroughly read and completely
understand all instructions and safety information in this
manual. Failure to comply can result in accidents
involving fire, electric shock or serious personal injury.
Save this manual and review it frequently for continued
safe operation, and use it to instruct others who may use
this tester.
CDI Torque Products is not responsible for
customer modification of test equipment for
applications on which CDI Torque Products
was not consulted.
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General Safety
WARNING
DTT Digital Torque Tester
Improper use can cause breakage.
• Read instructions before operating.
• Follow manufacturer’s instructions, safety
precautions, and specifications when operating
tools.
Broken equipment can cause injury.
Flying particles can be discharged when applying torque.
Users and bystanders must wear safety goggles.
Flying particles can cause injury.
Risk of entanglement.
• Keep body parts away from rotating parts.
• Wear a protective hair covering to contain long
hair and prevent contact with moving parts.
• Do not overreach. Keep proper footing and
balance at all times.
Entanglement can cause injury.
Torque Tester Safety
WARNING
• Be sure ratings for all components, including,
adaptors, extensions, drivers and sockets, match
or exceed the torque being applied.
• Do not use this instrument with power switch OFF.
Always turn power switch ON so torque values are
displayed.
• Do not turn the power switch ON with a torque
instrument engaged to tester transducer.
• Be sure the capacity of the DTT matches or
exceeds each application before performing a
procedure.
• Pull on a wrench handle—do not push—when tester
is mounted horizontally. Adjust stance to prevent a
possible fall.
• Do not use extensions, such as a pipe, on a
wrench handle.
• Fully engage the direction lever in the correct
position when using ratchets.
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DTT Digital Torque Tester
• Never attempt to test an impact tool or pulse type
• Mount the DTT securely to a heavy bench, wall or
• Do not use the DTT if it makes unusual noises,
• Do not use chipped, cracked, or damaged sockets
• Do not remove any labels. Replace any damaged
AC Adapter Safety
WARNING
Risk of electric shock and fire.
• Do not allow conductive objects to come in
• For indoor use only. Do not expose adapter to
• Replace defective cord immediately. Return to
• Do not use any other type of adapter. Using an
• Do not use an extension cord with adapter.
• Do not use a damaged adapter.
• Do not disassemble adapter.
• Do not attempt to connect two adapters together.
• Do not operate adapter with damaged cord or
• Do not operate adapter after it is dropped,
• Unplug adapter from outlet before maintenance or
• Read all instructions and safety messages on
Electric shock or fire can cause injury.
tool on this instrument.
other support structure before applying torque.
has loose parts, or shows any other sign of
damage. Have repairs performed at an Authorized
Service Center before use.
and accessories.
label.
contact with terminals. 120 or 220 volts present at
adapter terminals.
rain or snow. Do not use in damp locations.
qualified service center for replacement.
adapter not specifically designed for this unit may
damage tester.
plug. Replace immediately.
receives a sharp blow or damaged. Take the
adapter to an Authorized Service Center.
cleaning. Turning off tester is not adequate to
avoid hazard.
battery and adapter before use.
SAVE THESE INSTRUCTIONS
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DTT Digital Torque Tester
DTT System Components
B
A
C
D
A — DTT
B — AC Adapter
AC/DC transformer, Voltage Output: 9VDC, Current 1.66A
C — Battery Pack
Battery holder with 6 AA Battery cells
D — USB Cable
Figure 1: Digital Torque Tester System Components
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DTT Digital Torque Tester
Introduction
Use the portable DTT to test “click” type torque wrenches
(adjustable and preset), torque screwdrivers, dial indicating
and electronic wrenches.
The tester features a swivel-neck LCD display with
selectable English or Metric units of measure. 11 models
are available, ranging from 10-100 IN OZ to 60-600 FT LB.
The DTT displays torque values using a built-in straingaged
transducer with an accuracy of ±0.5% of indicated test value
from 10% to 100% of rated capacity, in clockwise (CW) and
counter-clockwise (CCW) directions.
Torque Values
Capture and display torque values in one of four
selectable modes:
• DIAL / ELECT (Peak Hold)
• SCREWDRIVER (Peak Hold)
CLICK ADJUST (First Peak) •
— Responds to the drop-off in torque caused by the
“click” of an adjustable wrench. FIRST PEAK torque
is measured, captured and displayed (CW or CCW)
just prior to the drop-off, even if click torque is
subsequently exceeded.
CLICK PRESET (First Peak) •
— Responds to the drop-off in torque caused by the
“click” of a preset wrench. FIRST PEAK torque is
measured, captured and displayed (CW or CCW)
just prior to the drop-off, even if click torque is
subsequently exceeded.
— Captures and displays the highest torque applied
(CW or CCW) until reset. Use to check dial indicating
and electronic torque wrenches.
— Captures and displays the highest torque applied
(CW or CCW) until reset. Use to check torque
limiting screwdrivers.
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DTT Digital Torque Tester
This manual contains general information.
Operating features and specifications may
change without notice. CDI Torque makes no
claims regarding the suitability of the information
in this manual for diverse user applications.
Power Source
The power source for the DTT is the supplied AC Adapter.
The tester can also be operated with the use of the 6 AA
Battery Pack that accompanies the tester.
Functional Description
TGT TORQUE: 250
DATA: 25
MAIN MENU
G
FIRST PEAK
0.0O
SETUP STORE
FT-LB
A
F
A — Display
B — Mounting Plate
H
I
2503-F-DTT
25 - 250 FT.LB.
DE
Figure 2: Digital Torque Tester (DTT), Front and Side Views
A four digit TFT display for torque readings.
Plate for securing tester to mounting surface. Use
four 1/4” diameter bolts.
6
B
C
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DTT Digital Torque Tester
C — Transducer
D — Battery Access
E — Power Switch
F — Audible Alert
G — Swivel
H — AC Adapter Jack
I — USB Jack
Female square drive.
Battery Pack housing panel. Remove Phillips screw
to access Battery Pack.
Rocker switch turns power to tester on and off.
Signal sounds momentarily when:
• Power to tester is initiated,
• Anytime a button pressed, and
• Target Torque is reached.
Holds the display for view from any angle.
Receptacle (9VDC @ 1.66A max) for continuous AC
operation.
Receptacle for uploading torque data to external
computer.
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Specifications
Display
LCD on swivel neck
Display Specifications
Size: 4.7 inch
Resolution: 480 (RGB) X 272
Accuracy
±0.5% of indicated test value from 10% to 100% of rated
capacity
Units of Measurement
FT-LB, IN-LB, IN-OZ, KG-CM, Nm and cNm
Operating Temperature
0 – 50°C (32 – 122°F)
Storage
-20 – 70°C (-4 – 158°F)
DTT Digital Torque Tester
Dimensions
Width
Height 15.2”
Depth 2.5”
Weight
11 lbs
Battery
Six 1.5V (AA), replaceable
AC Adapter
Input 100 ~ 240VAC (50-60 Hz)
Output 9VDC, 1.66A
Integral Transducer
Full bridge strain gage,
350 ohms, 1500 µE, 3mV/V F.S., 3.3V excitation
10.0”
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DTT Digital Torque Tester
Transducer Range and Display Resolutions
DTT built-in transducers provide industry standard
female square drives, and a full bridge strain gage
sensing element.
Contact your CDI Torque representative for service
and/or calibration.
IMPORTANT
IMPORTANT
Apply torque loads only. Never side-load a wrench
while installed on the tester transducer.
Transducers can withstand a torque of 25% over full
range. Do not use the tester if the transducer:
• Does not zero,
• Does not calibrate, or
• Has been over-torqued.
The table below describes minimum and maximum
display ranges.
Part Square Units
Number Drive English Metric
1001-O-DTT 1/4" 10.0–100.0 IN OZ 7.0–70.6 cNm
2001-O-DTT 1/4" 20.0–200.0 IN OZ 14.1–141.2 cNm
4001-O-DTT 1/4" 40.0–400.0 IN OZ 28.2–282.4 cNm
251-I-DTT 1/4" 2.5–25.0 IN LB 2.8–28.25 dNm
501-I-DTT 1/4" 5.00–50.00 IN LB 5.65–56.50 dNm
1001-I-DTT 1/4" 10.0–100.0 IN LB 11.3–113.0 dNm
2502-I-DTT 3/8" 25.0–250.0 IN LB 28.2–282.5 dNm
4002-I-DTT 3/8" 40.0–400.0 IN LB 45.2–452.0 dNm
10002-I-DTT 3/8" 100–1000.0 IN LB 113–1130 dNm
2503-F-DTT 1/2" 25.0–250.0 FT LB 33.9–339.0 Nm
6004-F-DTT 3/4" 60.0–600.0 FT LB 81.3–813.6 Nm
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Setup
DTT Digital Torque Tester
Mounting
Mount the DTT to a sturdy support before use. Torque
testing procedures may involve hundreds of pounds of
load. Be sure to consider counterweight of the mount to
accommodate torque testing operations and testing
fixtures. Allow enough room around and below the mount
for the wrenches or testing fixtures being used.
Vertical mounting on a wall or heavy pillar is preferred for
most wrench and tool testing as shown in the illustration
below. Use four 1/4” diameter bolts (torqued to 10 FT LB)
to insure a secure mount. The DTT can also be mounted
vertically to a horizontal surface using a right angle
bracket.
8.87”
2503-F-DTT
25 - 250 FT.LB.
B
8.87”
A
Figure 3: Mounting, Dimensions and Right Angle Bracket
A – Mounting Screw (4)
B – Right Angle Bracket
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DTT Digital Torque Tester
Tester Setup
1. Turn the power switch ON.
2. In the MAIN MENU screen, select DTT SETTINGS.
3. In the SYSTEM CONFIGURATION screen, the display
4. To increment or decrement the DATE/TIME/BRIGHTNESS
5. Press NEXT to update DATE/TIME/BRIGHTNESS and
reads:
DATE: MONTH / DAY / YEAR
TIME: HOUR / MINS
BRIGHTNESS: 30-100
elements, select the element and repeatedly press the
UP or DOWN arrows.
NOTE: Press and hold the UP or DOWN arrows to
change the display quickly. The scrolling
DATE/TIME elements roll over at both ends for
quick and convenient adjustment of settings.
return to the MAIN MENU.
SYSTEM CONFIGURATION
SW VERSION: 1.X.X CHECKSUM: A1XX
DATE:
TIME: HR MIN
BRIGHTNESS:
Nov 03 2009
11 07
60
NEXT
Figure 4: System Configuration screen
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Tests
Testing Wrenches
DTT Digital Torque Tester
IMPORTANT
• To avoid damage, be sure the DTT model being used
is capable of handling the torque being applied.
• Always position a torque wrench within 15° of
perpendicular to the display housing (Figure 5).
Testing Wrenches
1. Prepare tester for use. For additional information
WARNING
TGT TORQUE: 250
FIRST PEAK
DATA: 25
FT-LB
0.0O
MAIN MENU SETUP STORE
2503-F-DTT
Figure 5: Wrench Position, Perpendicular to Tester
refer to
TESTER SETUP.
NOTE: DTT will ZEROTARE automatically when power
switch is turned ON.
Do not turn the power switch ON with a torque
instrument engaged to tester transducer.
2. In the MAIN MENU screen, select TEST.
NOTE: The operator can return to the MAIN MENU
at any step during this procedure by pressing
the MAIN button.
3. In the SELECT WRENCH TYPE screen, select one
of the following options:
CLICK ADJUST
CLICK PRESET
DIAL / ELEC
SCREWDRIVER
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DTT Digital Torque Tester
4. In the SELECT TEST TYPE screen, select either:
QUICK CHECK (used when verifying torque
wrench readings), or
AUDIT (used when testing a torque wrench)
Quick Check
Mode
5a. If QUICK CHECK is selected in Step 4, the tester will
display the TEST SETUP screen (Figure 6).
DIGITAL TORQUE TESTER
TEST SETUP
TGT TORQUE : 250 FT-LB
SERIAL NUM : 110900MAW
OPERATOR ID : TECH512
MAIN TEST
Figure 6: Test Setup screen (Quick Check mode)
CHANGE
CHANGE
CHANGE
5b. Press the CHANGE button next to TGT TORQUE to
enter the Target Torque Value and Units desired
(Figure 7).
NOTE: If the incorrect value is entered, press BS to
clear the last digit entered, or press CLEAR to
delete the entire entry.
Press UNITS to scroll between FT-LB, IN-LB,
IN-OZ, KG-CM, Nm and cNm units.
Press NEXT to accept the entry and return to the
TEST SETUP screen.
ENTER TARGET TORQUE VALUE :
250
1 2 3 4
5 6 7 8
9 0 BS
MAIN CLEAR NEXT UNITS
Figure 7: Target Torque Value screen
FT-LB
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DTT Digital Torque Tester
5c. Press the CHANGE button next to SERIAL NUM to
enter a wrench Serial Number if required (Figure 8).
NOTE: The WRENCH S/N screen can be changed
from Numerical (Figure 8) to Alphabetical
(Figure 9) Mode and vice versa by pressing
the 0-9 or A-Z key respectively.
If the incorrect value is entered, press BS to
clear the last digit entered, or press CLEAR to
delete the entire entry.
The WRENCH S/N screen can be left blank If
the Serial Number information is not required.
A 12 digit long alpha-numeric combination can
be entered in the WRENCH S/N screen.
Press NEXT to accept the entry and return to the
TEST SETUP screen.
ENTER WRENCH S/N:
110900
1 2 3 4
5 6 7 8
A-Z 9 0 BS
CLEAR NEXT
Figure 8: Wrench Serial Number screen (Numeric Mode)
ENTER WRENCH S/N :
110900MAW
Q W E R T Y U I O P
A S D F G H J K L
0-9 Z X C V B N M BS
CLEAR NEXT
Figure 9: Wrench Serial Number screen (Alphabetical Mode)
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DTT Digital Torque Tester
5d. Press the CHANGE button next to OPERATOR ID to
enter an Operator Identification number if required
(Figure 10).
NOTE: The OPERATOR ID screen can be changed
from Alphabetical (Figure 10) to Numerical
(Figure 11) Mode and vice versa by pressing
the A-Z or 0-9 key respectively.
If the incorrect value is entered, press BS to
clear the last digit entered, or press CLEAR to
delete the entire entry.
The OPERATOR ID screen can be left blank If
the Operator Identification is not required.
An 8 digit long alpha-numeric combination can
be entered in the OPERATOR ID screen.
Press NEXT to accept the entry and return to the
TEST SETUP screen.
ENTER OPERATOR ID:
TECH
Q W E R T Y U I O P
A S D F G H J K L
0-9 Z X C V B N M BS
CLEAR NEXT
Figure 10: Operator ID screen (Alphabetical Mode)
ENTER OPERATOR ID:
TECH512
1 2 3 4
5 6 7 8
A-Z 9 0 BS
CLEAR NEXT
Figure 11: Operator ID screen (Numeric Mode)
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DTT Digital Torque Tester
5e. Press the TEST button to accept all entries and
display the QUICK CHECK test screen (Figure 12).
NOTE: The operator can return to the TEST SETUP
screen by pressing the SETUP button.
5f. Install the wrench on the transducer and apply torque.
5g. Press STORE to save torque measurements in the
internal memory. Torque measurements can be
offloaded to a PC using the USB cable. For
additional information refer to Data Offload.
TGT TORQUE: 250
DATA: 25
FIRST PEAK
FT-LB
0.0O
Audit Mode
MAIN MENU
Figure 12: Quick Check test screen
6a. If AUDIT is selected in Step 4, the tester will display
the TEST SETUP screen (Figure 13).
DIGITAL TORQUE TESTER
WRENCH SIZE : 250 FT-LB
SERIAL NUM : 110900MAW
OPERATOR ID : TECH512
Figure 13: Test Setup screen (Audit Mode)
SETUP STORE
TEST SETUP
CHANGE
CHANGE
CHANGE
MAIN TEST
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DTT Digital Torque Tester
6b. Press the CHANGE button next to WRENCH SIZE to
enter the Full Scale torque and Units of the wrench
being calibrated (Figure 14).
NOTE: If the incorrect value is entered, press BS to
clear the last digit entered, or press CLEAR to
delete the entire entry.
Press UNITS to scroll between FT-LB, IN-LB,
IN-OZ, KG-CM, Nm and cNm units.
Press NEXT to accept the entry and return to the
TEST SETUP screen.
ENTER WRENCH MAX RANGE :
250
1 2 3 4
5 6 7 8
9 0 BS
MAIN CLEAR NEXT UNITS
Figure 14: Wrench Max Range screen
NOTE: For information on how to update
SERIAL NUM, and
OPERATOR ID;
please refer to Steps 5c & 5d.
Press TEST to accept all entries.
FT-LB
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DTT Digital Torque Tester
6c. The tester will prompt user to set wrench to 20% of
Full Scale (Figure 15).
For example:
If WRENCH MAX RANGE (Step 6b) is entered
as 250 FT-LB, the DTT will prompt user to set
wrench to 50 FT-LB.
Press NEXT.
PLEASE SET WRENCH TO 50 FT-LB
NEXT
Figure 15: Wrench Set prompt screen
6d. The display will change to the 20% test screen
(Figure 16).
Install the wrench on the transducer.
The screen will display a test counter which indicates
the number of times the user must apply torque at the
20% setting:
TEST 1 of 3
TEST 2 of 3
TEST 3 of 3
Apply torque until the wrench reaches 50 FT-LB.
Then press STORE to advance the test counter.
Repeat procedure until counter reaches 3 of 3.
TEST 1 OF 3
DATA: 1
TGT TORQUE: 50
FIRST PEAK
FT-LB
0.0O
MAIN MENU
Figure 16: 20% torque test screen
18
STORE
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DTT Digital Torque Tester
6e. The tester will prompt user to set wrench to 60% of
6f. The display will change to the 60% test screen
Full Scale (Figure 17).
For example:
If WRENCH MAX RANGE (Step 6b) is entered
as 250 FT-LB, the DTT will prompt user to set
wrench to 150 FT-LB.
Press NEXT.
PLEASE SET WRENCH TO 150 FT-LB
NEXT
Figure 17: Wrench Set prompt screen
(Figure 18).
Install the wrench on the transducer.
The screen will display a test counter which indicates
the number of times the user must apply torque at the
60% setting:
TEST 1 of 3
TEST 2 of 3
TEST 3 of 3
Apply torque until the wrench reaches 150 FT-LB.
Then press STORE to advance the test counter.
Repeat procedure until counter reaches 3 of 3.
The stored data will also accumulate in the primary
store box.
TEST 1 OF 3
DATA: 3
TGT TORQUE: 150
FIRST PEAK
FT-LB
0.0O
MAIN MENU
Figure 18: 60% torque test screen
19
STORE
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DTT Digital Torque Tester
6g. The tester will prompt user to set wrench to 100% of
Full Scale (Figure 19).
For example:
If WRENCH MAX RANGE (Step 6b) is entered
as 250 FT-LB, the DTT will prompt user to set
wrench to 250 FT-LB.
Press NEXT.
PLEASE SET WRENCH TO 250 FT-LB
NEXT
Figure 19: Wrench Set prompt screen
6h. The display will change to the 100% test screen
(Figure 20).
Install the wrench on the transducer.
The screen will display a test counter which indicates
the number of times the user must apply torque at the
100% setting:
TEST 1 of 3
TEST 2 of 3
TEST 3 of 3
Apply torque until the wrench reaches 250 FT-LB.
Then press STORE to advance the test counter.
Repeat procedure until counter reaches 3 of 3.
The stored data will also accumulate in the primary
store box.
TEST 1 OF 3
DATA: 9
TGT TORQUE: 250
FIRST PEAK
FT-LB
0.0O
MAIN MENU
Figure 20: 100% torque test screen
20
STORE
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DTT Digital Torque Tester
6i . At the end of the test sequence, the tester will return to
6j. Stored torque measurements can be offloaded to a PC
Data Offload
Torque measurements are stored in the internal memory
everytime the STORE button is pressed during the testing
procedure. DTT tester allows users to offload saved data
to a PC via the USB cable.
To retrieve saved data:
the TEST SETUP screen in order to begin a new test
sequence. To continue the test sequence in the CCW
direction, press TEST.
using the USB cable. For additional information refer
to Data Offload.
-Connect the USB cable between the DTT and
PC USB ports.
-Turn the DTT switch ON.
-On the PC, double click the DTTDATA.CSV file
located in MY COMPUTER \ DTT.
-The DTTDATA file will contain the following
information (Figure 21):
TIME
DATE
OPERATOR ID
WRENCH SERIAL NUMBER
ACTUAL TORQUE
TARGET TORQUE
ERROR (%)
UNITS
To delete saved data:
-Deleted the DTTDATA.CSV file located in
MY COMPUTER \ DTT
TIME DATE OPERATOR ID WRENCH S/N ACT TORQUE TGT TORQUE ERR(%) UNITS
16:28:36 03/03/09 TEST A23456789012 35.66 50 16:29:13 03/03/09 SNAPON12 123ASFGHJKLQ 3
16:29:14 03/03/09 SNAPON12 123ASFGHJKLQ 3
16:29:15 03/03/09 SNAPON12 123ASFGHJKLQ 3
16:44:46 03/03/09 TEST A23456789012 4
16:45:23 03/03/09 TEST A23456789012 2
5.67 50 -28.65 FT-LB
5.67 50 -28.66 FT-LB
5.66 50 -28.68 FT-LB
8.4 50 -3.2 FT-LB
9.56 50 -40.89 FT-LB
28.68 FT-LB
Figure 21: Stored Data Information
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For Warranty Claims, Contact CDI Torque Products
LIMITED WARRANTY
The DTT Digital Torque Tester is backed by a one year
warranty. This warranty covers manufacturer defects and
workmanship. The warranty excludes misuse, abuse and
normal wear and tear. Exclusion is not allowed in some
states and may not apply. This warranty gives you specific
legal rights, and you may have other rights, which vary
from state to state.
19220 San Jose Ave.
City of Industry, CA 91748
Phone: 626-965-0668
Fax: 626-965-2410
Email: sales@cditorque.com
Website: www.cditorque.com
Made in USA with US and Global Components
FORM 20-2344-CDI
02/10 REV NC
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