Cooper Instruments & Systems DTW 750 User manual

Digital Torque Gage
DTW 750
User’s Guide
www.cooperinstruments.com
PH: 540-349-4746 • FAX: [phone]

CF 136 ii 09/07
CONTENTS
LIST OF EQUIPMENT...............................................................................................................................1
GENERAL OPERATION ...........................................................................................................................1
SELECTING MEASURING MODES ...........................................................................................................2
PROGRAMMING (TO EXIT PROGRAMMING AT ANY TIME PRESS OFF)...................................................2
STORING AND RECALLING DATA FROM MEMORY.................................................................................2
CLEARING DATA FROM MEMORY ..........................................................................................................3
DOWNLOADING MEMORY DATA.............................................................................................................3
AUTO POWER OFF..................................................................................................................................3
LOW BATTERY INDICATOR........................................................ ERROR! BOOKMARK NOT DEFINED.
SYSTEM RESET ......................................................................................................................................3
RS-232 SERIAL OUTPUT .........................................................................................................................3
SIGNAL LEVEL: RS232C............................................................. ERROR! BOOKMARK NOT DEFINED.
OUTPUT DATA FORMAT .........................................................................................................................3
WARRANTY REPAIR POLICY..............................................................................................................4
Limited Warranty On Products........................................................................................................................4
Obtaining Service Under Warranty .................................................................................................................4
Repair Warranty ................................................................................................................................................ 4

CF 136 1 09/07
List of Equipment
1. Torque Tester with 3/8” drive
2. CW one-way clutch
3. AC adapter/charger
Read First: Safety Information
For safety, and for damage avoidance, be sure to read this manual thoroughly. The warranty is only valid when
the product is used following the instructions provided within this manual.
•Do not use tester in high temperature, high humidity, or in damp or wet areas.
•Recommended operating temperature is between 0-42ºC (32-100ºF).
•Do not apply toque exceeding the rated capacity (180 lbf-in), regardless of whether the unit is On or Off.
Avoid shock load. Do not use with impact wrenches.
•When charging the battery, be sure to use the provided AC adapter/charger exclusively.
•Do not use lacquer thinner or any solvent to clean the unit.
•Do not disassemble or modify the unit.
•Recommended re-calibration cycle is one (1) year.
1. ON/OFF Switch Press once to turn on, press again to turn off (click once, do not hold). After 10 minutes of
non-use, unit shuts off.
2. CLR/PRG Switch To reset display, to zero and to store data.
3. LCD Display Displays torque value as well as low battery icon (LOBAT).
4. AC charger/adapter receptacle If LOBAT icon appears, 8-hour battery recharge required.
5. System reset button When the battery has been depleted completely and a recharge has been executed,
the system may not yet operate. In this case, press the System Reset Button.
6. RS-232 output
7. Wrench head swivels 300º to allow the display to be positioned for the most convenient torque reading.
General Operation
1. Place the appropriate size socket onto the drive.
2. Rotate the wrench head so the display may be viewed while measuring and position the socket securely
over the bolt (not at an angle) and turn to measure.
3. After taking measurement, press CLR/PRG switch to zero display for the next test.

CF 136 2 09/07
Selecting Measuring Modes
Press ON/OFF to turn on. Hold CLR/PRG for more than 4 seconds. Display cycles GO, PP, PD or C. Select the
desired measuring mode, which becomes the default mode. Press CLR/PRG to display the measuring mode.
GO (Real Time) display torque transient (no output).
PP (Peak) Capture peak torque (peak data output).
PD (Peak Down) Capture peak down value (peak data output).
C(continuous RS-232 output, 80 data/sec) Display torque transients.
Programming (to exit programming at any time press OFF)
Press ON/OFF to turn on. Press CLR/PRG and UP switches simultaneously and hold for more than 4 seconds.
The Green LED lights and one beep sounds, “HI” is displayed and then the High setpoint value. This confirms
the tester is ready for the following programming steps.
1. High Setpoint (HI) After “HI” is displayed and then the High setpoint value. Press UP or DOWN switch to
select the High setpoint value i.e. 50.0 for 50.0 lb-in (for lb-in gauge), then press CLR/PRG to enter.
2. Low Setpoint (LO) After High value is entered, “LO” is displayed and then the Low setpoint value. Press
UP or DOWN switch to select the Low setpoint value, then press CLR/PRG to enter.
3. Peak Down Minimum and Trigger Point (PdLO) After Low value is entered, “PdLO” is displayed and then
the PdLO value. Press UP or DOWN switch to select, then press SET to enter. PdLO sets a minimum
torque value for Peak Down mode. For example if “PdLO” value is set at 5.0 lb-in, only a reading over 5.0
lb-in will be measured in Peak Down mode.
PdLO also sets the start and stop trigger points for Continuous PdLO also sets the start and stop trigger
points for Continuous data output. When torque reaches the PdLO value, the gauge starts to output data
and stops if torque falls below the value.
4. Batch Counter (CO) After “PdLO” value is entered, “CO” is displayed and then the batch count number.
Press UP or DOWN switch to select (0-99), then press CLR/PRG to enter. Batch counter retains the number
of properly torqued fasteners counted in memory even if the tester is turned OFF. Press and hold ON/OFF
for more than 1 second to reset.
5. Beeper (bp) After the batch count number is entered, “bp” is displayed and the display shows “On” for
beeper set ON, “Off” for beeper set OFF or “FF” for no beep unless over high setpoint. Press UP or DOWN
switch to select, then press CLR/PRG to enter.
6. Auto Zero Reset (AC) After Beeper selection is entered, “AC” is displayed and then Auto Zero Reset
duration value. Press UP or DOWN to select 0.0C - 0.5C - 1.0C - 1.5C - 2.0C - 2.5C - 3.0C, and press
CLR/PRG to enter (0.5C for 0.5 second and 0.0C for MANUAL RESET). After measuring, Auto Zero
automatically resets the tester to “0.0”.
7. Time (In) After Auto Zero Reset is entered “In” is displayed and then the Time duration. Press UP or
DOWN switch to select Time (0 to 24 seconds), then press CLR/PRG to enter.
After “In” is entered, “S-“ is displayed to confirm programming completion and zero is shown.
After High and Low setpoints and batch counter are set, the tester counts the number of correctly torqued
fasteners (between High and Low setpoint). When completed, tester flashes the Green LED and beeps three
times. If the “Time” duration (“In” value) elapses before reaching the batch count number, the Red LED flashes
and beep sounds to alert to possible mis-tightening or stripped thread.
Storing and Recalling Data from Memory
Memory functions work in PP, PD and C modes. Store up to 300 values in memory. Values are simultaneously
output as RS-232 even after memory is full.
1. Measure in PP or PD mode, press CLR/PRG to store peak values. In C mode, the tester outputs data
continuously (80 data/sec).
2. To recall a value, press CLR/PRG, then press UP or DOWN to select a memory location (i.e. .0.0.1 for first
location). When CLR/PRG is released, display cycles three times between location and torque value and
then returns to measurement mode.
Note: Selecting an invalid location, defaults to measurement mode.

CF 136 3 09/07
Clearing Data from Memory
1. Single clear: When a memory value is displayed, press CLR/PRG, then “CLR” displays and blinks 3 times.
Press CLR/PRG switch again before “CLR” stops blinking and the memory value is erased.
2. All clear: Press CLR/PRG and DOWN simultaneously until “ALL” is displayed. While “ALL” is blinking,
press CLR/PRG again. Display changes to “CLR” and blinks 3 times. Press CLR/PRG switch again before
“CLR” stops blinking and all memory data is erased.
Downloading Memory Data
1. Press ON/OFF to turn on.
2. Press UP and DOWN switches simultaneously. The display blinks “FA” twice and then displays numbers
with decimal points in between (.0.0.1 for first memory location).
3. Press UP or DOWN switch to select the desired beginnin memory location and press CLR/PRG to enter.
The display blinks “LA” for the ending memory location.
4. Press UP switch or DOWN switch to select the desired ending memory location and press CLR/PRG to
enter.
5. Press CLR/PRG switch to download the data. While downloading the data, the display shows “-P-“.
Note: By pressing DOWN switch for more than 1 sec, the download function can be terminated.
Auto Power Off
To maximize the life of the battery, power automatically shuts off after 10 minutes of non-use.
IMPORTANT! Use the provided AC adapter/charger exclusively and plug into the correct AC output. It takes 8
hours to fully recharge. Do not recharge for more than 12 hours. When fully charged, disconnect the AC
adapter/charger is to avoid overcharging.
In order to avoid high heat, explosion or toxic fumes, please note the following precautions:
1. Be sure to use only the provided AC charger exclusively.
2. Do not plug the charger into unspecified higher voltage.
3. Do not recharge until LOBAT icon appears.
System Reset
When battery power is completely depleted, the tester may not work even though it has been recharged. In this
case, press the System Reset Button.
RS-232 Serial Output
Data output is available in the PD, PP and C modes. In PD and PP modes peak data is output when ZERO is
pressed or activated by the AUTO ZERO function. In C mode, the gauge outputs data continuously.
RS-232C Signal: 8 data, 2 stop, no parity. Baud rate: 9600 bps.
Peak Data Output Format
[CAN] _ _ _ [SO] [value] _ [SI] [unit] [CR]
[CAN]: ASCII control code 24
_: Space (code 32)
[SO]: ASCII control code 14
[value]: Output data with sign and decimal point. Plus sign represents CW torque and minus
sign for CCW. [value] always occupies six locations and empty locations will be filled
with spaces.
[SI]: ASCII control code 15
[unit]: N*m _ _ _=N·m
kgf*cm=kg·cm
lb*in=lb·in
[CR]: ASCII control code 13 (Carriage Return)
Continuous Output Data Format
[CAN][value][CR]

CF 136 4 09/07
Dimensions
WARRANTY REPAIR POLICY
Limited Warranty On Products
Any Cooper Instruments product which, under normal operating conditions, proves defective in material or in
workmanship within one year of the date of shipment by Cooper will be repaired or replaced free of charge
provided that a return material authorization is obtained from Cooper and the defective product is sent,
transportation charges prepaid, with notice of the defect, and it is established that the product has been properly
installed, maintained, and operated within the limits of rated and normal usage. Replacement or repaired
product will be shipped F.O.B. from our plant. The terms of this warranty do not extend to any product or part
thereof which, under normal usage, has an inherently shorter useful life than one year. The replacement
warranty detailed here is the buyer’s exclusive remedy, and will satisfy all obligations of Cooper whether based
on contract, negligence, or otherwise. Cooper is not responsible for any incidental or consequential loss or
damage which might result from a failure of any and all other warranties, express or implied, including implied
warranty of merchantability or fitness for particular purpose. Any unauthorized disassembly or attempt to repair
voids this warranty.
Obtaining Service Under Warranty
Advance authorization is required prior to the return to Cooper Instruments. Before returning the item, contact
the Repair Department c/o Cooper Instruments at [phone] for a Return Material Authorization number.
Shipment to Cooper shall be at buyer’s expense and repaired or replacement items will be shipped F.O.B. from
our plant in Warrenton, Virginia. Non-verified problems or defects may be subject to a $150 evaluation charge.
Please return the original calibration data with the unit.
Repair Warranty
All repairs of Cooper products are warranted for a period of 90 days from date of shipment. This warranty
applies only to those items that were found defective and repaired; it does not apply to products in which no
defect was found and returned as is or merely recalibrated. It may be possible for out-of-warranty products to
be returned to the exact original specifications or dimensions.
* Technical description of the defect: In order to properly repair a product, it is absolutely necessary for Cooper
to receive information specifying the reason the product is being returned. Specific test data, written
observations on the failure and the specific corrective action you require are needed.