Omega Engineering DFG35 Series Manual de usuario

DFG35

Digital Force Gauges

DFG35 Digital Force Gauges User’s Guide

Thank you…

Thank you for purchasing a Omega DFG35 digital force gauge,

designed for tension and compression force testing applications from

0.12 lb to 500 lb (0.5 N to 2,500 N) full scale. The DFG35 is an essential

component of a force testing system, typically also comprising a test

stand, grips, and data collection software.

With proper usage, we are confident that you will get many years of

great service with this product. Omega force gauges are ruggedly built

for many years of service in laboratory and industrial environments.

This User’s Guide provides setup, safety, and operation instructions.

Dimensions and specifications are also provided. For additional

information or answers to your questions, please do not hesitate to

assist you.

Before use, each person who is to use the DFG35 force gauge

should be fully trained in appropriate operation and safety

procedures.

TABLE OF CONTENTS

OVERVIEW.........................................................3

POWER...............................................................4

MECHANICAL SETUP.......................................5

HOME SCREEN AND CONTROLS ...................6

OPERATING MODES.........................................8

CHANGING THE UNITS.....................................8

DIGITAL FILTERS..............................................9

SET POINT INDICATORS..................................9

COMMUNICATIONS AND OUTPUTS.............10

CALIBRATION .................................................11

OTHER SETTINGS...........................................16

SPECIFICATIONS............................................18

DFG35 Digital Force Gauges User’s Guide

1 OVERVIEW

1.1 List of included items

Part No.

Description

DFG35-0.12 –

DFG35-20 DFG35-50 –

DFG35-100 DFG35-200 –

DFG35-500

1 12-1049 12-1049 12-1049 Carr

Case

1 08-1022 08-1022 08-1022

C adapter bod

with US, EU, or UK pron

1 08-1026 08-1026 08-1026 Batter

(

inside the

)

1 G1024 G1024 G1031 Extension rod

1 G1026 G1026 G1033 Cone

1 G1025 G1025 G1032 Chisel

1 G1027 G1027 G1034 V-

roove

1 G1029 G1029 G1036 Flat

1 G1028 G1038 G1035 Hook

1 N/

G1039 G1037 Couplin

1 - Certificate of calibration

1 09-1165 USB cable

1 - Resource CD

(

USB driver, user’s

uide

)

1.2 Safety / Proper Usage

Caution!

Note the force gauge’s capacity before use and ensure that the capacity is not exceeded.

Producing a force greater than 150% of the gauge’s capacity can damage the internal load cell. An

overload can occur whether the gauge is powered on or off.

Typical materials able to be tested include many manufactured items, such as springs, electronic

components, fasteners, caps, films, mechanical assemblies, and many others. Items that should not be

used with the gauge include potentially flammable substances or products, items that can shatter in an

unsafe manner, and any other components that can present an exceedingly hazardous situation when

acted upon by a force.

The following safety checks and procedures should be performed before and during operation:

1. Never operate the gauge if there is any visible damage to the AC adapter or the gauge itself.

2. Ensure that the gauge is kept away from water or any other electrically conductive liquids at all

times.

3. The gauge should be serviced by a trained technician only. AC power must be disconnected and

the gauge must be powered off before the housing is opened.

4. Always consider the characteristics of the sample being tested before initiating a test. A risk

assessment should be carried out beforehand to ensure that all safety measures have been

addressed and implemented.

5. Wear eye and face protection when testing, especially when testing brittle samples that have the

potential to shatter under force. Be aware of the dangers posed by potential energy that can

accumulate in the sample during testing. Extra bodily protection should be worn if a destructive

failure of a test sample is possible.

DFG35 Digital Force Gauges User’s Guide

6. In certain applications, such as the testing of brittle samples that can shatter, or other applications

that could lead to a hazardous situation, it is strongly recommended that a machine guarding

system be employed to protect the operator and others in the vicinity from shards or debris.

7. When the gauge is not in use, ensure that the power is turned off.

2 POWER

The gauge is powered either by an 8.4V NiMH rechargeable battery or by an AC adapter. Since these

batteries are subject to self discharge, it may be necessary to recharge the unit after a prolonged period

of storage. Plug the accompanying charger into the AC outlet and insert the charger plug into the

receptacle on the gauge (refer to the illustration below). The battery will fully charge in approximately 8

hours.

Caution!

Do not use chargers or batteries other than supplied or instrument damage may occur.

If the AC adapter is plugged in, an icon appears in the lower left corner of the display, as follows:

If the AC adapter is not plugged in, battery power drainage is denoted in a five-step process:

1. When battery life is greater than 75%, the following indicator is present:

2. When battery life is between 50% and 75%, the following indicator is present:

3. When battery life is between 25% and 50%, the following indicator is present:

4. When battery life is less than 25%, the following indicator is present:

5. When battery life drops to approximately 2%, the indicator from step 4 will be flashing.

Several minutes after (timing depends on usage and whether the backlight is turned on or

off), a message will appear, “BATTERY VOLTAGE TOO LOW. POWERING OFF”. A 4-tone

audio indicator will sound and the gauge will power off.

The gauge can be configured to automatically power off following a period of inactivity. Refer to the Other

Settings section for details.

If battery replacement is necessary, the battery may be accessed by separating the two halves of the

gauge. Refer to the Mechanical Setup section for details.

USB connector

Power input jack

DFG35 Digital Force Gauges User’s Guide

3 SETUP

3.1 Mechanical setup

3.1.1 Loading shaft orientation

In order to accommodate a variety of testing requirements, the orientation of the loading shaft may be set

up in either of the two positions shown below. In order to change the loading shaft orientation, loosen the

two captive screws on the back side of the housing, separate the two housing halves, rotate one half 180

degrees, and reassemble. Exercise care when reassembling the two halves of the housing, ensuring that

internal wires do not interfere.

Load cell shaft up Load cell shaft down

3.1.2 Mounting to a plate

Although the gauge may be used by hand, proper mounting is important if attached to a fixture or test

stand. The round steel insert with a hole in the back of the housing is provided to withstand the load

during a test. A mating dowel pin should be used (see illustration below). There are four threaded holes

located near the corners of the housing. These holes are designed to accommodate screws in order to

hold the gauge in place. The screws must not be used for load bearing purposes. Failure to use a dowel

pin properly can result in a hazardous situation.

3.1.3 Mounting attachments to the gauge

The force gauge’s threaded loading shaft is designed to accommodate common grips and attachments

with female mounting holes. To mount a grip, gently thread it onto the shaft. Other mounting adapters are

also available to prevent rotation. Ensure that the grip or fixture is positioned to ensure axial load with

respect to the loading shaft of the force gauge. When using a grip, ensure that it secures the sample in

such a way that it is prevented from slipping out during a test, preventing a potential safety risk to the

DFG35 Digital Force Gauges User’s Guide

operator and others in the vicinity. If using a grip or fixture from a supplier other than Omega, ensure that

it is constructed of suitably rugged materials and components.

Do not use jam nuts or tools to tighten grips or attachments onto the shaft. Finger-tighten only. Anti-

rotation mounting adapters are available.

3.2 Installing the USB driver

If communicating via USB, install the USB driver provided on the Resource CD. Installation instructions

may also be found on the CD or may be downloaded from www.mark-10.com.

Caution!

Install the USB driver before physically connecting the gauge to a PC with the USB cable.

Further instructions for configuring and using the gauge’s outputs are provided in the Communications

and Outputs section.

4 HOME SCREEN AND CONTROLS

4.1 Home Screen

No. Name Description

1 Tension /

compression

indicator - indicates a compression (push) direction

- indicates a tension (pull) direction

These indicators are used throu

hout the displa

and menu.

2 Peaks The maximum measured compression and tension readings. These readings

are reset b

pressin

ZERO or b

powerin

the

e off and on.

3 Primary reading The current displayed force reading. See Operating Modes section for

details.

DFG35 Digital Force Gauges User’s Guide

4 Load bar Analog indicator to help identify when an overload condition is imminent. The

bar increases either to the right or to the left from the midpoint of the graph.

Increasing to the right indicates compression load, increasing to the left

indicates tension load. If set points are enabled, triangular markers are

displayed for visual convenience. This indicator reflects the actual load, which

may not correspond to the primary reading (depends on operating mode).

The ZERO key does not reset the load bar. See Operating Modes section for

details.

5 Units The current measurement unit. Abbreviations are as follows:

lbF – Pound-force

kgF – Kilogram-force

gF – Gram-force

N – Newton

Note: not all gauge capacities measure in all the above units. Refer to the

capacit

/ resolution table in the Specifications section for details.

6 Mode The current measurement mode. Abbreviations are as follows:

RT – Real Time

PC – Peak Compression

PT – Peak Tension

See Operatin

Modes section for details about each of these modes

7 Battery / AC

adapter indicato

Either the AC adapter icon or battery power icon will be shown, depending on

power conditions. Refer to the Powe

section for details.

8 High / low limit

indicators Correspond to the programmed set points. Indicator definitions are as follows:

– the displayed value is greater than the upper force limit

– the displayed value is between the limits

–

the displa

ed value is less than the lower force limit

9 Set points The programmed force limits. Typically used for pass/fail type testing. 1, 2, or

no indicators may be present, depending on the configuration shown in the

Set Points menu item.

4.2 Controls

Primary

Label Primar

Function Secondary

Label Secondar

Function

Powers the gauge on and off. Press

briefly to power on, press and hold

to power off. Active only when the

home screen is displa

ed.

ENTER Various uses, as described in the

following sections.

ZERO Zeroes the primary reading and

peaks.

(

)

Navigates up through the menu and

sub-menus .

MENU Enters the main menu. ESCAPE Reverts one step backwards through

the menu hierarch

MODE Toggles between measurement

modes.

(

DOWN

)

Navigates down through the menu

and sub-menus.

DATA Transmits the current reading to an

external device, via the USB port. DIRECTION Reverses the display during

calibration, and toggles between

tension and compression directions

while configuring set points and other

menu items.

Note: Measurement units are configured through the menu. Refer to Section 6 for details.

DFG35 Digital Force Gauges User’s Guide

4.3 Menu navigation basics

Most of the gauge’s various functions and parameters are configured through the main menu. To access

the menu press MENU. Use the UP and DOWN keys to scroll through the items. The current selection is

denoted with clear text over a dark background. Press ENTER to select a menu item, then use UP and

DOWN again to scroll through the sub-menus. Press ENTER again to select the sub-menu item.

For parameters that may be either selected or deselected, press ENTER to toggle between selecting and

deselecting. An asterisk (*) to the left of the parameter label is used to indicate when the parameter has

been selected.

For parameters requiring the input of a numerical value, use the UP and DOWN keys to increment or

decrement the value. Press and hold either key to auto-increment at a gradually increasing rate. When

the desired value has been reached, press ENTER to save the change and revert back to the sub-menu

item, or press ESCAPE to revert back to the sub-menu item without saving. Press ESCAPE to revert one

step back in the menu hierarchy until back into normal operating mode.

Refer to the following sections for details about setting up particular functions and parameters.

5 OPERATING MODES

Caution!

In any operating mode, if the capacity of the instrument has been exceeded by more than 110%,

the display will show “OVER” to indicate an overload. A continuous audible tone will be sounded

(if beeps are enabled) until the MENU key has been pressed or the load has been reduced to a

safe level.

Three operating modes are possible with DFG35 gauges. To cycle between the modes, press MODE

while in the home screen.

5.1 Real time (RT)

The primary reading corresponds to the live measured reading.

5.2 Peak Compression (PC)

The primary reading corresponds to the peak compression reading observed. If the actual force

decreases from the peak value, the peak will still be retained in the primary reading area of the display.

Pressing ZERO will reset the value.

5.3 Peak Tension (PT)

Same as Peak Compression, but for tension readings.

6 CHANGING THE UNITS

DFG35 gauges display one of three measurement units. To change the unit, select Units from the menu.

The display will appear as follows:

UNITS

* lbF

kgF

DFG35 Digital Force Gauges User’s Guide

The gauge will always power on with the unit selected.

7 DIGITAL FILTERS

Digital filters are provided to help smooth out the readings in situations where there is mechanical

interference in the work area or test sample. These filters utilize the moving average technique in which

consecutive readings are pushed through a buffer and the displayed reading is the average of the buffer

contents. By varying the length of the buffer, a variable smoothing effect can be achieved. The selection

of 1 will disable the filter since the average of a single value is the value itself.

To access digital filter settings, select Filters from the menu. The display will appear as follows:

Two filters are available:

Current Reading – Applies to the peak capture rate of the instrument.

Displayed Reading – Applies to the primary reading on the display.

Available settings: 1,2,4,8,16,32,64,128,256,512,1024. It is recommended to keep the current reading

filter at its lowest value for best performance, and the displayed reading filter at its highest value for best

stability.

8 SET POINT INDICATORS

8.1 General Information

Set points are useful for tolerance checking (pass/fail). Two limits, high and low, are specified and stored

in the non-volatile memory of the instrument and the primary reading is compared to these limits.

8.2 Configuration

To configure set points, select Set Points from the menu. The screen will appear as follows:

Either one, two, or none of the set points may be enabled. To toggle between the tension and

compression directions, press the DIRECTION key.

DIGITAL FILTERS

(1 = Fastest)

Current Reading

Displayed Reading

1024

SET POINTS

Upper Disabled

* Upper Enabled

5.00

Lower Disabled

* Lower Enabled

3.50

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