CDI Torque SURETEST Torque Calibration System User Manual

Torque Calibration System Setup 4-1 Testing Torque Wrenches and Drivers 4-1 Selecting a Transducer 4-1 Installing a Transducer 4-1 Dial and Bending Beam Torque Wrenches and Screwdrivers 4-2 Adjustable or Preset “Click” Wrenches and Screwdrivers 4-3 Testing Power Tools 4-4 Non-Impact Tools 4-4 Displaying Statistical Analysis 4-7 Displaying Statistical Analysis on LCD 4-7 Printing Statistical Analysis 4-8 Displaying or Downloading Data List 4-10 Displaying Data List on LCD 4-10

Downloading Data List to Printer 4-10 How to Use Analog Output (Rear Panel BNC Connector) 4-11

Calibration 5-1 Mounting Details 5-1 Quick Check 5-4 Torque Transducer Calibration 5-7

TABLE OF CONTENTS 1

Suretest Indicator Torque Calibration 5-11 Gravitational Effects 5-14 Correction Factors on Test Weights 5-14 Gravitational Charts 5-14

2000-600-02 Manual Loader 6-1 Application 6-1 Torque Tester/Calibrator 6-2 2000-600-02 Manual Loader 6-3 Loader Rear Panel Controls 6-5 Ball Handle Adaptor 6-6 4-in-1 Transducer (Accessory) 6-7 Extension Arm (Accessory) 6-8 Types of Loader Testing 6-9 Torque Driver Testing 6-9 Torque Multiplier Testing 6-9

Accessories A-1 SURETEST System Components and Inventory Control A-2

Optional Transducers and Accessories A-3 Calibration Accessories A-5

TABLE OF CONTENTS 2

Using this Manual

This manual contains instructions for use and setup of the Suretest Torque Calibration System. A table of contents and a table of illustrations are provided to make this manual easy to use.

Some of the information shown in text or illustrations is obtained using optional equipment.

Conventions

This section contains a list of conventions used in text.

Chapter References

Additional information in text is referenced by chapter number and section name.

Example:

For testing procedures refer to Chapter 4—Using the SURETEST System.

Equipment Damage

The possibility of damage to vehicle or equipment is introduced by a signal word indicating this condition.

Example:

IMPORTANT

The connector on single transducer cables contains the EEPROM calibration memory chip. Never attempt to remove the connector from the transducer. It is installed with a permanent adhesive.

Safety Messages

Safety messages are provided to help prevent personal injury and equipment damage. All safety messages are introduced by a signal word indicating the hazard level. The types of safety messages are: Danger, Warning and Caution.

TABLE OF CONTENTS 3

DANGER

Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury to the operator or to bystanders.

WARNING

Indicates a potential hazard which, if not avoided, could result in death or serious injury to the operator or to bystanders.

CAUTION

Indicates a potential hazard which, if not avoided, may result in minor or moderate injury to the operator or to bystanders.

The three-part message panel, used with safety messages, uses three different type styles to further define the potential hazard:

• Normal type states the hazard,

• Bold type states how to avoid the hazard, and Warning.

• Italic type states the possible consequences of not avoiding the hazard.

Some safety messages contain visual symbols with signal words.

Example:

WARNING

Flying particles can discharge when applying torque.

• Users and bystanders must wear safety goggles.

• Always wear safety goggles when applying torque.

Flying particles can cause injury.

4

Safety Information

Important Safety Instructions

This manual contains important safety and operating instructions for CDI SURETEST Torque calibration system. Refer to the information in this manual often for safe operation.

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.

The signal word indicates the level of hazard in a situation:

• Danger indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury to the operator or bystanders.

• Warning indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury to the operator or bystanders.

• Caution indicates a potentially hazardous situation which, if not avoided, may result in moderate or minor injury to the operator or bystanders.

The three-part message uses three different type styles to further define the potential hazard.

• Normal type states the hazard.

• Bold type states how to avoid the hazard.

• Italic type states the possible consequences of not avoiding the hazard.

SAVE THESE INSTRUCTIONS

WARNING

Risk of electric shock and fire.

• For indoor use only. Do not expose charger to rain or snow. Do not use in damp locations.

• Replace defective cord immediately. Return to qualified service center for replacement. Electric shock or fire can cause injury.

WARNING

Flying particles can discharge when applying torque.

• Users and bystanders must wear safety goggles.

• Always wear safety goggles when applying torque.

• Do not use this equipment with the power off. Always turn on the indicator and loader so the torque and load values are indicated on the display. The safety relays only work when the power is on. Flying particles can cause injury.

5

WARNING

Risk of entanglement.

• When starting power tools, check for obstacles near your hand and anticipate the reaction force by gripping the tool firmly.

• Do not wear loose clothing and jewelry while operating a power tool. Loose clothes and jewelry can be caught in moving parts.

• 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.

WARNING

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.

WARNING

• Make sure all components, including, adaptors, extensions, drivers and sockets are rated to match or exceed the torque or load being applied.

• Be sure the capacity of the SURETEST system matches or exceeds each application before performing a procedure.

• Do not use the SURETEST system if it makes unusual noises, has loose parts, or shows any other sign of damage. Have repairs performed at an Authorized Service Center before use.

• Do not use chipped, cracked, or damaged sockets and accessories.

• Do not remove any labels. Replace any damaged label.

• Follow good, professional tool practices: ** Pull on a wrench handle ** do not push ** and adjust stance to prevent a possible fall. ** Do not use extensions, such as a pipe, on a wrench handle.

• When using ratchets, make sure the direction lever is fully engaged in the correct position.

• Never attempt to test an impact tool on this instrument.

• Always position the 40" arm over the front of the stand as shown. Never extend the test arm behind the stand. The stand will tip over when weights are applied.

• Always be alert to the potential for personal injury that may be caused by excessive torque applications, careless handling of heavy weights, and out-of-balance or unsafe weight distribution.

6

PRODUCT DESCRIPTION

CDI-SURETEST MODEL 5000-ST

The SURETEST is a laboratory grade instrument that provides TORQUE measurements. Although designed as an independent laboratory equipment, it can also be used in an integrated environment as the principal component of a Torque Calibration System. The SURETEST features versatile data acquisition capabilities including measurement storage, retrieval, statistical analysis and automatic downloading to an external printer/computer. A remote computer COM port is available for PC interfacing.

Used with precision torque transducers, the SURETEST provides high speed monitoring of static or dynamic torque inputs. Torque/force transducers, purchased separately, are available in ranges from 15-200 in- oz, to 200-2000 ft-lb, and provide system readings with an accuracy of +/- 0.25% of indicated value, or better. A special memory chip is built into each torque/force transducer that identifies its range and maintains its calibration between any other SURETEST with an accuracy of +/- 0.5%. The SURETEST and its transducers may be calibrated by using accessory precision bars and certified weights.

All readout of torque in ft-lb, in-lb, in-oz, Nm, dNm, cNm, mkg as well as calibration, statistical analysis and set-up functions are reported on a versatile 1.5” x 5.5” graphic dot matrix Liquid Crystal Display (LCD).

Set-up and calibration programming is entered using easy-to-use front panel membrane keys. The number of keys is kept to a minimum. In addition, concise menus and graphic symbols are used to guide the user through all set-ups and operations. HIGH and LOW torque limits are adjustable to give an audible alert. The user selects TRACK mode to display torque values as they are applied, PEAK HOLD or POWER TOOL modes to display the highest torque value applied, or FIRST PEAK mode which captures the torque output at the “click” of a set-able wrench or driver. CLEAR, STORE and SEND functions can be set up for automatic or manual operation.

The SURETEST stores and recalls up to 3000 torque readings and does statistical analysis on them for downloading to printer or computer. The statistical report (print out) includes a simple histogram for process monitoring. True RS-232 serial printer and separate RS-232 computer COM ports are at the back of the unit

7

CHAPTER 1

Introduction

The SURETEST is a laboratory grade instrument that provides TORQUE measurements. Although designed as an independent digital indicator, it can also be used in an integrated environment as the principal component of a Torque Calibration System. The SURETEST features versatile data acquisition capabilities including measurement storage, retrieval, statistical analysis and automatic downloading to an external printer/computer. A remote computer COM port is available for PC interfacing.

Used with precision torque transducers, the SURETEST provides high speed monitoring of static or dynamic torque inputs. Torque transducers, purchased separately, are available in ranges from 15-200 in- oz, to 2002000 ft-lb, and provide system readings with an accuracy of ± 0.25% of indicated value, or better. A special memory chip is built into each torque transducer that identifies its range and maintains its calibration between any other SURETEST with an accuracy of ± 0.5%. The SURETEST and its transducers may be calibrated by using accessory precision bars and certified weights.

All readout of torque in ft-lb, in-lb, in-oz, Nm, dNm, cNm, mkg as well as calibration, statistical analysis and set-up functions are reported on a versatile 1.5” x 5.5” graphic dot matrix Liquid Crystal Display (LCD).

Set-up and calibration programming is entered using easy-to-use front panel membrane keys. The number of keys is kept to a minimum. In addition, concise menus and graphic symbols are used to guide the user through all set-ups and operations. HIGH and LOW torque limits are adjustable to give an audible alert. The user selects TRACK mode to display torque values as they are applied, PEAK HOLD or POWER TOOL modes to display the highest torque value applied, or FIRST PEAK mode which captures the torque output at the “click” of a set-able wrench or driver. CLEAR, STORE and SEND functions can be set up for automatic or manual operation.

The SURETEST stores and recalls up to 3000 torque readings and does statistical analysis on them for downloading to printer or computer. The statistical report (print out) includes a simple histogram for process monitoring. True RS-232 serial printer and separate RS-232 computer COM ports are at the back of the unit.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

The SURETEST operates directly from any AC power line between 120VAC to 220 VAC, 50–60 Hz without the need for switch selection. A hard-wired lithium battery keeps the internal memory and date-time clock operating for up to 10 years. The real time clock is fully year 2000 compliant.

The information in this manual is general. Operational features, procedures and specifications may change without notice. CDI makes no claims as to the suitability of this information for diverse user applications.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

CHAPTER 2 Functional Descriptions and Specifications

The SURETEST is CDI’s next generation Torque Measurement System. It provides exceptional accuracy and ease of use. It is packaged in a compact, sturdy and attractive housing unit which requires little room on a laboratory bench. The SURETEST is typically used in conjunction with a Transducer and a Mechanical Loader.

Fig 2-1

Base Unit

The SURETEST monitors and displays the torque applied.

Transducer (Accessory)

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

The loader accepts all SURETEST series single transducers directly. Use a 2000-500-02 adapter kit to mount the optional 2000-400-02 4-in-1 transducer. For additional information refer to Appendix A–Accessories.

Loader

Use the 2000-600-02 Manual Loader for testing and calibrating all torque wrenches, drivers, torque multipliers, non-impact pneumatic and electric nut runners. Loader components are:

• Stand For Base Unit

• Safety Shield

• Hand Crank

• Transducer Mounting

Roll Cabinet

The roll cabinet features nine heavy duty drawers with ball bearing slides, locking wheels and drawer locks. SURETEST accessories are stored in the roll cabinet which is fitted with foam inserts for easy inventory control. The nine drawers are assigned and arranged as shown in figure A-1 of Appendix A.

SURETEST Base Unit

This section describes the major hardware components of the SURETEST Base Unit, including:

• Front Panel

• Rear Panel (Input/Output)

• SURETEST Torque Transducers.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

FRONT PANEL

Figure 2-3: SURETEST Front Panel

A- Membrane Function ( F1, F2, F3, F4, F5, F6 ),

And Cursor/Selection (Up, Down, Left, Right and Enter ) Keys.

B- Soft Key Menu: Zero, # Data Stored, Setup, Send, Store, Clear, Escape, Format.

C- Real Time Clock. HH:MM:SS

D- Modes: Track, Peak Hold, First Peak and Power tools.

E- Maximum Range of Transducer.

F- Engineering Units : Nm, dNm, Ncm, mkg, cmkg, ft.lb, in.lb, in.oz

G- Power: On/Off

H- Scroll Bar Each dot represents 10% of Full scale.

I- Torque Reading: Full 5-digit readi ng Plus Sign (for dir ection)

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

SURETEST DISPLAY

A 240 x 64 Full-featured Graphic LCD is used to provide versatile and clear displays of system menus as well as measurements. Characters and symbols are displayed in different fonts:

• Maximum transducer range in the selected UNITS of measure.

• Statistical mean of all measurements in memory.

• The number of the present data memory location.

Front Panel Membrane Cursor and Function Keys

The SURETEST is supported by a powerful Graphic User Interface (GUI). Set up, Command, or Control is done by selecting the appropriate Action Item on one of the provided Menus. Front Panel Membra ne Cursor and Functio ns keys are defined to gui de the User in selecting an Action Item.

There are 6 function (soft) keys: the LCD.

To select an Action Item, the User simply presses a Function Key (F1-F6) to get to a Menu, uses a Cursor Key to move to the Item, then hits ‘ENTER’ .

In addition to the

The GUI also provides P rompts to further a ssi st the user in navigating the Menus.

‘ENTER’ key, there are 4 Cursor Keys : UP , DOWN , LEFT , RIGHT .

F1 through F6. Their respective uses are clearly indicated on

Power Up Sequence

Upon power up, the SURETEST automatically performs Self-tests and displays the results. Any detected non-functional hardware will be reported on the LCD. If a 4-in-1 transducer is connected, the SURETEST performs ZEROTARE, then displays the following default menu while continuously checking for any activity from an input transducer :

The user can either press F1 to display previously collected data (if any) or enter Setup Mode. Any detected torque measurement will cause the SURETEST to enter Measurements mode where the following menu is displayed:

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

The SURETEST always returns to the default menu from the measurements mode in the event there is no selection / input by the User. This serves as a reminder for more (input) measurements.

Setup Mode

The following Selections are available:

1. SELECT MODE

2. SELECT UNIT

3. SELECT LANGUAGE

4. MANUFACTURER’S DEFAULTS

5. AUTO SETTINGS

6. EDIT LIMITS

7. CLOCK ADJUST

8. CALIBRATION

9. EDIT P ARAMETERS

10. CDI INTERNAL

11. ABOUT

1. Select Mode

Selects either TRACK, PEAK HOLD, FIRST PEAK, or POWER mode.

• TRACK : In this mode, the SURETEST continually makes Torque Me asurements.

• PEAK : The SURETEST makes Torque Measurement at the Highest Peak.

• 1.PEAK : The SURETEST makes Torque Measurement at the First Peak.

• POWER : The SURETEST makes Torque Measurement at the Highest Peak at a faster rate.

2. Select Unit

Selects the following Torque units on LCD display:

Nm, dNm, cNm, mkg, ft-lb, in-lb, in-oz .

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

3. Select Language

Selects either English, German (Deutsch), French (Francais), Spanish (Espanol), or Portugue se (Portugues) .

4. Manufacturer’s Defaults:

A warning message is first displayed. Upon confirmation by the User, the Default Settings will be loaded into the SURETEST.

5. Auto Settings

Sets up CLEAR, STORE, and SEND functions. There are 2 options: Automatic or Manual.

Selection: Automatic Clear, Automatic Store and Automatic Send data out (to RS-232 port).

Selection: Delay 9 seconds then clear the Display, Manual Store and Manual Send.

Selection: Automatic Clear, Automatic Store and Manual Send.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

6. Edit Limits

Sets up high torque limit preset. (->) to go Down 1 line. Sets up low torque limit preset. (<-) to go Up 1 line.

Use Up or Down cursor key to increment or decrement the respective value.

Use Left or Right cursor key to select digit. Press ‘Save’ to activate the change. Press ‘Clear” to Clear All Limit set-up. Press ‘Escape’ to Exit. Last setup is retained.

7. Clock Adjust

Edits DATE/TIME programming function.

To adjust the Clock, use LEFT or RIGHT cursor key to get to Day, Month, Year, Hour, Minute, or Second field. Then use UP or DOWN cursor key to increment or decrement the respective value. Press and hold the cursor key to change the value quickly.

Press ‘ENTER’ to activate the change.

8. Calibration

This enables the User to perform calibration of the SURETEST. The procedures for both the single and 4-in-1 transducers are in Chapter 5.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

9. EDIT PARAMETERS

Sets up serial protocol function. Sets delay (in ms) per character upon printing. Sets delay (in ms ) per Linefeed. Minimum block-out with zero at 0.1% F.S. in Tracking Mode. Minimum block-out with zero at 1.0% F.S. in Peak-Hold Mode.

10. CDI INTERNAL

For Manufacture r’s use only.

11. About

This provides relevant information regarding the CDI company, the software version, and the

serial number of the SURETEST device.

12. Other Features:

Provides manual ZERO TARE.

Stores present measurement to memory.

Recalls memory data to display.

Sends all memory data, statistical analysis and histogram to printer port.

Sends data list with or without date-time stamp to computer / printer.

Manually clears display in PEAK, FIRST PEAK, POWER TOOL modes.

Sets up memory clear options in RECALL mode.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

Rear Panel (Input/Output)

Figure 2-5: SURETEST Rear Panel

A- SOLENOID CONTROL (Hirose RM15TRD-12S)

PIN FUNCTION

10 Loader Relay Common

11 Loader Relay CCW Limit

12 Loader Relay CW Limit

B ANALOG OUTPUT (BNC)

Analog output provides a voltage level output that is directly proportional to transducer input,

from -1.8V (full scale counter clockwise) to +1.8V (full scale clockwise). Zero offset +/-100 mV.

Linearity +/-1% of reading. Maximum load = 5 mA.

When using the 4-in-1 transducer, zero output fluctuates until o ne of the transducers is scan selected by applying 5% of full scale torque.

C- Foot Pedal Switch Input

D- Fuse Holder

Use AC fuse at specified rating only. ( 3.15 Amp).

E- INPUT AC VOLTAGE

Automatic Selection of any AC voltage from 100VAC to 230VAC, 50-60 Hz.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

F- PRINTER PORT (DB-9P)

PIN FUNCTION

2 Receive

3 Transmit

5 Ground

G- OPTIONAL (DB-9P)

PIN FUNCTION

2 Receive

3 Transmit

5 Ground

H- TRANSDUCER INPUT (DB-37S)

PIN FUNCTION

1 not used

2 ground

3 smart chip - bit 2

4 smart chip - bit 0

5 single xducer (-) signal

6 single xducer (+) signal

7 ground

8 4-in-1 xduce r (-) signal 2

9 4-in-1 xduce r (+) signal 2

10 ground

11 4-in-1 xducer (-) signal 4

12 4-in-1 xducer (+) signal 4

13 4-in-1 xducer LED 2

14 4-in-1 xducer LED 4

15 loader relay CW limit

16 not used

17 not used

18 ground

19 bridge excitation (+3V)

20 not used

21 smart chip - bit 3

22 smart chip - bit 1

23 ground

24 ground

25 4-in-1 xducer (-) signal 1

26 4-in-1 xducer (+) signal 1

27 ground

28 4-in-1 xducer (-) signal 3

29 4-in-1 xducer (+) signal 3

30 no transducer

31 4-in-1 xducer LED 1

32 4-in-1 xducer LED 3

33 loader relay CCW limit

34 loader relay common

35 Vcc (+5V@100 ma. max)

36 ground

37 bridge excitation (+3V)

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

SURETEST Transducers

SURETEST transducers provide industry standard square drives. They feature a full

bridge strain-gauge @ 350 Ohms nominal. Full range output is 1500 uE, 9mV (3mV/V @ 3.0V excitation).

Torque transducers use a built-in EEPROM memory chip that stores range identification and calibration factors. Calibration of transducers is accomplished using precision torque bars and certified weights. For additional information, refer to Chapter 5—Calibration.

After a transducer is calibrated, it provides ±0.5% system accuracy with any SURETEST System. If the transducer and SURETEST are calibrated together, the system accuracy increases to ±0.25%.

Transducer Dimensions/Transducer Torque Range

Calibration also results in a specified display resolution on the SURETEST. Display resolution is dependent on the type o f transducer being used. The following table shows display resolutions for the specified transducer with the force arm.

Display Resolution for Transducers

SURETEST torque transducers can withstand an overload of 110% of full range. The SURETEST alarms, (audible beep and display "OVER" ) at 110% of rated capacity.

To protect the tool under test or to serve as a fastener installation torque preset alert, the SURETEST produces a constant audible tone when the input torque exceeds the SET LOW limit. It then produces a pulsating tone when the input torque exceeds the SET HIGH limit.

The SURETEST Indicator ignores inputs less than 0.1% of full range in TRACK mode, 2% in PEAK HOLD mode, 7% in FIRST PEAK and POWER TOOL modes.

With the 4-in-1 transducer, the SURETEST System ignores inputs less than 2% of full range after scan select.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

Specifications

SURETEST Torque Calibration System System Accuracy

±0.25% of reading @ 25°C

(Suretest and transducer calibrated together)

SURETEST Transducers used with, but not calibrated to, another SURETEST provide a system

accuracy of ±0.5% of reading @ 25°C.

Temperature Drift

+0.03%/°C (+0.017%/°F)

Display Accuracy

±0.05% of reading @ 25°C

Temperature

Operating Temperature

10 to 32°C (50 to 90°F)

Storage

-20 to 50°C (-2 to 122°F)

Humidity

Up to 90%, Non-condensing

Temperature Drift

+0.011%/°C, (+0.006%/°F)

Dimensions

Width 10.5“

Height 4.5"

Depth* 10.5" *Includes handle, feet and connectors

Weight

8 .4 lbs

Fuse:

Amperage, 3.15 amps

Data Storage/Recall w/Date Time Stamp

3,000 measurements

Statistical Analysis

Max, Min, Range, M ean, Sigma N, Sigma, Cp, Cpk

%Error, -NoGo, +NoGo, Histogram.

FUNCTIONAL DESCRIPTIONS AND SPECIFICATIONS CHAPTER 2

Printer Serial Output Port

Default: 9600 Baud Rate.

Serial Communications

RS-232 (true)

300—19.2K Baud

8 data bits

1 stop bit

no parity

Computer Serial COM Port (OPTIONAL)

Default: 19,200 Baud Rate.

RS-232 (True)

Analog Output

+(CW)/-(CCW) 1.8V at transducer full range linearity

±1% of reading

Loader Control Relays

Two, normally open, Form A, rated 12VDC @ 1/2A close contact at 110% CW or CCW of torque

transducer range. For additional information refer to Transducer and System specifications.

Display Capacity

(16 bit A/D), 5 digits, ±32,000 counts

Units of Measurement

Torque

ft-lb, in-lb, in-oz, Nm, dNm, cNm, mkg, cmkg

Torque Resolution

Refer to transducer range and display resolution tables in Functional Description of this chapter.

Accuracy

±0.2% of reading @ 25°C, within specified range, when used as prescribed with the 2000-600-02

Loader.

Range and Resolution

Refer to transducer range and display resolution tables in Functional Description of this chapter.

Temperature

Operating Temperature

10 to 32°C (50 to 90°F)

Storage

-20 to 50°C (-2 to 122°F)

Humidity

Up to 90% non-condensing

Temperature Drift

+0.02%/°C (+.011%/°F)