Extech Instruments 407820 User manual

User's Manual

Heavy Duty Digital Torque Meter

Model 407820

Introduction

Congratulations on your purchase of the Extech Heavy Duty Torque Meter,

Model 407820. This professional device measures torque in three ranges with

1.5% basic accuracy. Advanced functions include Peak and Data Hold, Record

Mode, and RS-232 PC Interface. Careful use of this meter will provide years of

reliable service.

407820

FAST/SLOW

POWER

RECORD/RECALL

PEAK RESOLUTION

HOLD

UNIT

SENSOR

ZERO

Torque

Meter

Kg cm

Model 407820 Version 3.0 August 20052

Specifications

General Specifications

Display 3-½ digit (2000 count) multi-function LCD

Units of Measure Kilogram-centimeter (kg-cm)

Pound-inch (lb-in)

Newton-centimeter (N-cm)

Resolution Programmable High or Low resolution (see range

specifications)

Meter Power 9V battery

Power consumption 12mA (approx.)

Auto Power Off Meter turns off after 10 minutes (can be defeated)

Max/Min Record/Recall Records highest (MAX) and lowest (MIN) readings

Data Hold Displayed reading can be held on the LCD by

pushbutton

Response Time Fast (125ms) and Slow (334ms); selectable

PC Interface Built-in RS-232 jack; Optional data acquisition software

Operating conditions Temperature: 32 to 122oF (0 to 50oC); Humidity < 80%

Dimensions Meter: 7.1 x 2.8 x 1.3" (180 x 72 x 32mm)

Chuck: 1.9" (48mm) head diameter [6.3" (160mm)

handle] 0.5” (12.7mm) opening size

Weight Meter: 0.5 lbs. (225g); Chuck: 1.46 lbs (665g)

Accessories Torque chuck, chuck key, 9V battery, and rubber

holster with table-top stand

Range Specifications

Unit Range High

resolution Low

resolution

Accuracy

kg-cm 15 Kg-cm 0.01 kg-cm 0.1 kg-cm

lb-inch 12.99 lb-in 0.01 lb-in 0.1 lb-in

N-cm 147.1 N-cm 0.1 N-cm 1 N-cm

±(1.5% + 5d)

FULL SCALE

WARNING: DO NOT exceed the meter’s specified torque limit (refer to Range

Specification for range limits). Exceeding the torque limit can permanently

disable the sensor load cell.

Model 407820 Version 3.0 August 20053

Meter Description

1. Sensor Input

2. RS-232 PC Interface jack

3. LCD Display

4. Keypad

5. Rubber Protective Holster

6. Battery compartment on rear (rubber protective jacket must be removed

from meter to access the rear battery compartment)

7. Chuck

407820

FAST/SLOW

POWER

RECORD/RECALL

PEAK RESOLUTION

HOLD

UNIT

SENSOR

ZERO

Torque

Meter

Kg cm

Model 407820 Version 3.0 August 20054

Meter Operation

Connecting the Sensor

1. This meter accepts only the supplied 15 kg chuck. Push the SENSOR button

to confirm the 15 kg chuck; the LCD should read '15' when the button is

pressed.

2. Connect the chuck's cable to the input jack at the top of the meter.

3. Remove the chuck from the meter when the meter is not in use.

Powering the meter

1. The meter is powered by a 9V battery located in the rear battery

compartment. Note that the meter's protective rubber jacket must be

removed to access the battery compartment.

2. Press the POWER button to turn the meter on.

3. Press the POWER button again to turn the meter off.

Selecting the unit of measure

1. Use the UNIT button to scroll through the available measurement units. Each

selection is reflected on the LCD.

2. The available units are: pound-inch (lb-in), kilogram-centimeter (kg-cm), and

Newton-centimeter (N-cm).

Selecting the resolution

1. Use the RESOLUTION button to select the desired resolution, Low or High.

The selections are listed in the Range Specifications earlier in this manual.

2. Use the high resolution setting when the measurement is in the lower area of

the measurement range. Use the low resolution setting when the

measurement is in the higher regions of the measurement range.

Selecting the response time

The meter can be configured as fast responding (125ms) or slow responding

(334ms). Fast response is used to capture readings that are changing rapidly.

Slow response if used for average readings or slowly changing torque readings.

To select the response time:

1. Press the FAST/SLOW button.

2. The LCD will display 'F' for fast response or 'S' for slow response.

Taking measurements

1. Place a driver bit into the chuck.

2. Tighten the chuck using the supplied chuck key.

3. Push the ZERO button to zero the display.

4. Apply force to the device under test and view the Torque reading on the

meter's LCD.

WARNING: DO NOT exceed the meter’s specified torque limit (refer to Range

Specification for range limits). Exceeding the torque limit can permanently

disable the sensor load cell.

Model 407820 Version 3.0 August 20055

Data Hold

1. Press the HOLD button to freeze the displayed reading. The LCD will display

the icon 'HOLD' when Data Hold is engaged.

2. Press the HOLD button to de-activate this feature. The 'HOLD' icon will

switch off.

3. Note that Data Hold is not available while the meter is in the Max/Min Record

mode.

Peak Hold

1. Press the PEAK button to activate the Peak Hold feature. The LCD will

display 'PEAK' when Peak Hold is engaged.

2. The meter will now display only the highest reading. Each time a higher

reading is encountered the LCD will update.

3. Press the PEAK button to de-activate this feature. The 'PEAK' icon will switch

off.

4. Note that Peak Hold is not available while the meter is in the Max/Min Record

mode.

RECORD / RECALL and Max/Min Data Recording

The Max/Min feature stores the maximum reading and minimum reading while

the user takes measurements. The Max and the Min readings can later be

recalled.

1. Press the RECORD/RECALL button to activate this feature. The LCD will

display the ‘REC’ icon and the meter will begin monitoring the highest (Max)

and lowest (Min) readings.

2. After measurements are made, press the button again to view the Max

reading. The ‘MAX’ icon will appear on the LCD along with the highest

reading.

3. Press again to view the minimum (MIN) reading. The 'MIN' display icon will

appear on the LCD along with the lowest reading.

4. To exit this mode, press and hold the RECORD / RECALL button until the

‘REC’ indicator switches off. Note that exiting this mode clears the MAX and

MIN values.

RS-232 PC Interface

The optically isolated RS-232 PC Interface port is located on top of the meter

next to the sensor jack. A Data Acquisition Software package that includes

WindowsTM software and a meter-to-PC interface cable can be obtained from

Extech or an authorized distributor. The Part Number for the kit is 407001.

Instructions for use are supplied with the kit.

Model 407820 Version 3.0 August 20056



Support line (781) 890-7440

Technical support: Extension 200; E-mail: [email protected]m

Repair & Returns: Extension 210; E-mail: [email protected]

Product specifications subject to change without notice

For the latest version of this User’s Guide, Software updates, and other

up-to-the-minute product information, visit our website: www.extech.com

Extech Instruments Corporation, 285 Bear Hill Rd., Waltham, MA 02451

Warranty

EXTECH INSTRUMENTS CORPORATION warrants this instrument to be free of defects

in parts and workmanship for one year from date of shipment (a six month limited warranty

applies to sensors and cables). If it should become necessary to return the instrument for

service during or beyond the warranty period, contact the Customer Service Department at

(781) 890-7440 ext. 210 for authorization or visit our website www.extech.com for contact

information. A Return Authorization (RA) number must be issued before any product is

returned to Extech. The sender is responsible for shipping charges, freight, insurance and

proper packaging to prevent damage in transit. This warranty does not apply to defects

resulting from action of the user such as misuse, improper wiring, operation outside of

specification, improper maintenance or repair, or unauthorized modification. Extech

specifically disclaims any implied warranties or merchantability or fitness for a specific

purpose and will not be liable for any direct, indirect, incidental or consequential damages.

Extech's total liability is limited to repair or replacement of the product. The warranty set

forth above is inclusive and no other warranty, whether written or oral, is expressed or

implied.

Calibration and Repair Services

Extech offers repair and calibration services for the products we sell. Extech also

provides NIST certification for most products. Call the Customer Service Department for

information on calibration services available for this product. Extech recommends that

annual calibrations be performed to verify meter performance and accuracy.

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