Agate AT-2040 Manuel utilisateur

AT2040 lReleased 10/12/2021

Operator Manual

AT2040 PORTABLE

TRANSDUCER TEST SET

agatetechnology.com l 951-719-1032

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AGATE TECHNOLOGY AT2040

Table of Contents

Introduction................................................................................................................................................ 4

Product Technical Support ..................................................................................................................... 4

2-Year Limited Warranty ......................................................................................................................... 4

Disclaimer ............................................................................................................................................... 4

Copyright ................................................................................................................................................ 4

Safety information ..................................................................................................................................... 5

Primary functions ...................................................................................................................................... 6

Maximum weight recommendations ....................................................................................................... 6

Specications and performance.............................................................................................................. 7

Instrumentation and control system ....................................................................................................... 8

Physical overview.................................................................................................................................... 10

AT2040 accessories................................................................................................................................. 12

Battery operation..................................................................................................................................... 13

Operation instructions ........................................................................................................................... 14

Main Menu Screen Overview................................................................................................................ 14

Navigating the AT2040 Menu................................................................................................................ 16

Using the Frequency and Amplitude Knobs ................................................................................... 16

Using the Touchscreen.................................................................................................................... 16

Using the Adjustable Displays ........................................................................................................ 16

Editing a Text Field.......................................................................................................................... 16

Using the Keyboard and Number Pad............................................................................................ 16

Using Toggle Buttons...................................................................................................................... 16

Shake Mode.......................................................................................................................................... 17

Shake Mode Screen Overview........................................................................................................ 18

Conducting a Test in Shake Mode.................................................................................................. 19

Purewave™ Overview ..................................................................................................................... 19

Test Mode ............................................................................................................................................. 20

Testing in Manual Mode ................................................................................................................. 22

Testing in Automatic Mode ............................................................................................................ 23

Calibrating IEPE Accelerometers .................................................................................................... 24

Calibrating Charge Accelerometers ................................................................................................ 25

Calibrating 4-20mA Transmitters .................................................................................................... 26

Calibrating Triaxial Sensors ............................................................................................................ 28

Calibrating Proximity Probes ......................................................................................................... 29

Setup Mode .......................................................................................................................................... 38

Deleting and Saving Previous Test Records ................................................................................... 39

Adjusting Date and Time Zone........................................................................................................ 43

Network Setup ................................................................................................................................ 44

Calibration and Company Name..................................................................................................... 45

Exporting and Importing PDF Certicate Files ............................................................................... 46

Simulation Mode................................................................................................................................... 48

Controlling the AT2040 remotely............................................................................................................ 50

Install and Setup VNC Viewer ............................................................................................................... 50

Setting up a custom sensor ................................................................................................................... 53

Designing a Custom Sensor ................................................................................................................. 53

Adding a Test Point ......................................................................................................................... 54

Deleting a Test Point ....................................................................................................................... 54

Saving a Custom Sensor ...................................................................................................................... 56

Uploading a Saved Custom Sensor...................................................................................................... 56

Deleting a Custom Sensor .................................................................................................................... 59

Customizing the PDF certicate template............................................................................................ 60

HTML Tags............................................................................................................................................ 61

HTML Tips....................................................................................................................................... 61

HTML Keywords ................................................................................................................................... 62

Product maintenance.............................................................................................................................. 68

AT2040 Recalibration............................................................................................................................ 68

Battery .................................................................................................................................................. 68

Service Notes........................................................................................................................................ 68

Operator notes......................................................................................................................................... 68

A2LA accreditation.................................................................................................................................. 69

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AGATE TECHNOLOGY AT2040

Introduction

This manual is intended to inform the operating user on product specications, setup,

troubleshooting, and operation procedures for the AT2040. The AT2040 is designed as a

rugged, completely self-contained, battery-powered, vibration sensor test set. The AT2040 is

meant for use in the eld or laboratory, for the verication of control room working conditions, or

to verify the performance of vibration transducers.

Product Technical Support

For technical support for the AT2040, email us at help@agatetechnology.com or call us

at 951-719-1032. Training webinars are also available; contact technical support for more

information.

2-Year Limited Warranty

Agate Technology LLC warranties this product against defects in material and workmanship for

normal use following published product documentation for a period of TWO (2) years following

the date of purchase. The limited warranty includes drift/accuracy. Product documentation

includes, but is not limited to, the product manual, datasheet, technical specications, and

communication with our service department. This warranty does not cover damage caused by

operator negligence, misuse, abuse, accident, use inconsistent with product documentation, or

unauthorized repair or modication by anyone other than Agate Technology and its authorized

service providers. Any defective product meeting the above limited warranty requirements will be

repaired or replaced at no charge.

Disclaimer

Agate Technology LLC will not be liable for any indirect, special, incidental, or consequential

damages, including but not limited to, damages for loss of prot or revenue, loss or interruption

of business, loss of use, loss of data, or other intangible losses arising from any defect or error

in this manual or product.

Although Agate Technology LLC endeavors to produce accurate documentation, this publication

may contain inaccuracies or typographical errors. Agate Technology LLC reserves the right to

make changes, corrections, and improvements to this manual and product, at any time without

notice.

reproduced without written permission.

Safety information

Please keep this manual in a safe location for reference.

WARNINGS

• AT2040 is designed for vertical use. Operating in

the horizontal position is possible as the AT2040

element has linear bearings for support, but the

load should not exceed 400 grams.

• This instrument may shake violently at high

amplitude and low frequency. Always make sure

to keep the unit secure and operate on a stable

surface.

• When amplitude or frequency have exceeded

their acceptable ranges, the unit will issue

a warning or shut down, depending on the

operating conditions.

• Even when closed, this instrument is not

waterproof. Never use near water.

• Failure to hold the accelerometer with the short-

handle wrench when attaching and removing

transducers can cause permanent damage to

the AT2040.

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AGATE TECHNOLOGY AT2040

Primary functions

1. Shake or excite a transducer under test

In shake mode, the AT2040 can be used as a variable frequency and variable amplitude

shaker. In this mode, the frequency and amplitude are set manually by the user while the

computer provides high-accuracy measurement signals.

2. Calculate transducer sensitivity

By comparing signals sent to the reference accelerometer by the signal generation board

and the signals returned by the transducer under test, the AT2040 can automatically

determine the test transducer's sensitivity to a high level of accuracy.

3. Produce a NIST-traceable calibration certicate

Once the sensitivity has been calculated and saved across the test transducer’s frequency

range, the AT2040 will produce a NIST-traceable certicate and graph in PDF format. This

certicate is stored in the computer’s memory and may be recalled and exported at any

time to a USB memory drive.

4. Simulate a transducer using a precision signal generator (function generator)

The AT2040 is capable of producing signals over a wide amplitude and frequency using

its built-in ampliers to simulate a variety of charge and voltage signals. This allows

the user to simulate a working transducer and is the ideal tool for electronics testing,

troubleshooting, or calibrating condition monitoring systems.

Maximum weight recommendations

Frequency

Maximum Weight in Grams

0 – 100 g 100 – 250 g 250 – 500 g 500 – 750 g

10 – 100 Hz 10 4 2 1

100 – 1,000 Hz 7 4 2 1

1,000 – 10,000 Hz 3 1.5 0 0

Table 1. Maximum weight recommendations in grams

Specifications and performance

Performance

Frequency Range (operating) [1] 5 Hz to 10 kHz 360 to 600000 CPM

Maximum Amplitude

(100 Hz, with no payload)

20 g pk

15 in/s pk

50 mils p-p

196 m/s² pk

380 mm/s pk

1270 µm p-p

Maximum Payload [2] 800 grams

Sensor Test Method Automatic sweep or manual operation

Test Types Manual sensitivity

Automatic sweep

Sensor simulation

Certication

Sensor Select Built-in transducer library

Calibration Sheets Automatic creation to memory

Export to USB drive in PDF or CSV format

No spreadsheet or user input required

Certicate includes test point with graph

Memory 16GB (internal storage)

MicroSD slot for additional storage

Vibration Signal Accuracy

Acceleration (5 Hz to 9 kHz) ± 4 %

Acceleration (10 Hz to 10 kHz) ± 2.5%

Displacement (30 Hz to 150 Hz) ± 3 %

Amplitude Linearity (100 gram

payload, 100 Hz)

< 1 % up to 10 g pk

Waveform Distortion (100 gram

payload, 30 Hz to 2 kHz)

< 5 % THD (typical) up to 5 g pk

Simulation Performance

Frequency Range 1 to 11,000 Hz

Maximum Amplitude

Examples:

1 V

100 g at 10 mV/g

10 g at 100 mV/g

1000 pF

10 pF/g @ 100 g

100 pF @ 10 g

Test Type Manual

Accuracy < 1 % error at 10 g

Simulator Sensor Types

Supported

Accelerometer: • Charge

• Voltage • IEPE

Velocity

4-20 mA vibration transmitters

Proximity probes

Input/Output

Test Sensor Inputs Accelerometer: • Charge

• Voltage • IEPE

Velocity

4-20 mA vibration transmitters

Proximity probes

Bias Measurement Yes

Built-in Excitation Current

and Supply Voltages for

Transducers

IEPE current source

−24 V proximity driver source

+24 V 4-20 mA supply

Variable voltage output supply 5–10 V

External Source In (Max) 1 V AC RMS

Readout

Acceleration g pk

m/s² pk

g RMS

m/s² RMS

Velocity mm/s pk

in/s pk

mm/s RMS

in/s RMS

Displacement (peak to peak) mils p-p µm p-p

Frequency Hz CPM

Power

Internal Battery (sealed solid gel

lead acid)

12 V DC 6 amp hours

AC Power (for recharging battery) 100 – 240 V 50 – 60 Hz

Operating Battery Life

100 gram payload, 100 Hz 1 g pk

100 gram payload, 100 Hz 10 g pk

12 hours

3 hours

Physical

Sensor Connectors BNC

Terminal strip

DIN

Display 4.3” TFT LCD with 480 × 272 resolution

Controls 2 dials with touch screen

Dimensions (H × W × D) 8.5 × 12 × 10 in 22 × 30.5 × 28 cm

Weight 15.2 lbs 6.9 kg

Sensor Mounting Platform Thread Size ¼-28

Operating Temperature 32 – 122 °F 0 – 50 °C

Agency Requirements and

Certications A2LA Accredited [3]

NIST Traceable

EMC: EN61326-1

LVD: EN61010-1

ISO/IEC 17025:2017

RoHS

Accessories

Included

Accessories

• Power cable

• Micro dot (10-32)

• ¼-28 stud

• 2-56 UNC adapter

• Universal Velocity Adapter

Disc

• Universal Accelerometer

Adapter Disc

• Short-handle wrench

• 10-32 UNF stud

• 6-32 UNC adapter

• 10-32 UNF adapter

• USB drive: loaded with

setup software for custom

sensor

Optional

Accessories [4]

• Proximity Probe Adapter Kit (digital or manual micrometer)

• Chadwick-Helmuth Velocimeter Cable

• Triaxial Accelerometer Adapter

Warranty 2 years (includes drift/accuracy)

Tech Support Training webinars, email support

[1] 100 gram payload.

[2] Maximum weight recommendations:

[3] Vibration simulator not part of A2LA scope.

[4] For a comprehensive list, please consult the Product Spec Sheet or contact sales.

Frequency 0 -100 Grams 100 –250 Grams 250 –500 Grams 500 –800 Grams

10 – 100 Hz 10 g 4 g 2 g 1 g

100 – 1000 Hz 7 g 4 g 2 g 1 g

1000 – 10000 Hz 3 g 1.5 g 0 0

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AGATE TECHNOLOGY AT2040

Instrumentation and control system

The AT2040 consists of an internal charger, battery, main power amplier, charge converter,

electrodynamic shaker, NIST-traceable reference accelerometer, internal computer, signal

generation board, and LCD display screen (Figure 1).

Figure 1. AT2040 block diagram

Charger: Internal charger which operates between 100 V and 220 V for worldwide power

support.

Battery: 6 amp hour, sealed lead acid rechargeable battery. FAA-transport approved.

Power Amplier: Takes the input signal from the signal generator and is used to drive the

electrodynamic shaker.

Electrodynamic Shaker: Produces 4.5 lbf pk of sine force and is made with carbon-

ber composite and isolated linear bearings. This provides low distortion when shaking the

transducer load.

Reference Accelerometer: NIST-traceable calibration standard accelerometer with ¼-28

tapped mounting hole.

Test Transducer: Calculate sensitivity output.

Signal Generation Board: Consists of multiple ampliers and channels selectable by internal

relays. This is categorized into three dierent applications:

• Power Amplier Output: Controls the vibration of the electrodynamic shaker at the

amplitude and frequency set by the user.

• Input: Reads the sensitivity of multiple transducer types.

• Signal Generator: Outputs a wide range of simulated voltage and current measurements.

Charge Converter: For direct input of charge mode accelerometers.

Sensor Simulator Output: Generate articial transducer signal.

Computer: 1 GHz Cortex-A8 processor, 512 MB DDR3 RAM, 20GB of storage memory

included, with USB and network connectivity.

LCD Display Screen: Color 4.3″ LCD 480×272 resolution display with resistive touchscreen.

USB Output: Export previous tests to a USB drive in PDF or CSV format.

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AGATE TECHNOLOGY AT2040

0 to -24

Out

COM

OUT +

OUT -

24V+

COM

SIG

COM

-V

4-20

SIM

ON/OFF SENSOR

INPUT

SENSOR

SIMULATOR

OUTPUT

CUSTOM

SENSOR

AC 110-240USB

AMPLITUDE FREQUENCY

AT-2040

4-20

SIMULATION

SENSOR

VIBRATION SENSOR

TEST SET

A J K I H G

EDCB

Figure 2. Physical diagram of the AT2040

1. Charge

2. Ground

3. 5–10 Volt Output

(Adjustable)

4. Channel A: Input for

transducers that provide

voltage outputs

5. Channel B: Triax

6. Channel C: Triax

7. Test Signal

8. Displacement Input

6 7

Figure 3. Rear-view pinout diagram

Physical overview

See Figure 2:

A. On / O Button: Press and hold for 1 second to power on. Press and hold for 5 seconds

to power o.

B. Electromagnetic Shaker and Reference Accelerometer: Mounting location for

transducer under test (TUT). Always use the short-handle wrench provided, otherwise

twisting force will be applied directly to the electrodynamic shaker.

C. Proximity Probe Mounting Locations (2): Proximity Probe Kit is sold as an add-on

accessory.

D. Dual USB Ports (2): Plug in peripheral devices, such as a network adapter or a USB

memory drive, for importing and exporting les, connecting to a network, and factory

calibration.

E. 100–240 V Power Plug Receptacle

F. LCD Display Screen: 4.3" LCD 480×272 resolution display with resistive touchscreen.

G. Frequency Knob: Turn the knob to adjust frequency. During screen navigation, turn the

knob to move up and down through the onscreen options and press the knob to select.

H. Amplitude Knob: Turn the knob to adjust amplitude. During screen navigation, press the

knob to go back.

I. BNC Sensor Simulator Output: Simulates a variety of transducer types using adjustable

voltage and supply currents through an on-board signal generator. Data provided by the

built-in sensor library includes: charge, IEPE, −24V proximity probe, 4-20mA supply.

J. BNC Sensor Input: Supports sensitivity testing for charge, IEPE, proximity probes, and

velocity sensors.

K. Custom Sensor In / Out: See Rear-View Pinout Diagram (Figure 3) on next page.

L. Proximity Probe Output Simulator: Capable of providing a test signal between 0 and

−24 volts.

M. 4-20 mA Sensor Output Simulator: Capable of providing a test signal between 4 and 20

milliamps.

N. 4-20 mA Input: Input for sensitivity test of 4-20ma transducers and vibration transmitters.

Also supplies +24 volt power.

O. Proximity Probe Driver Input and Power: Input for radial and axial measurements and

built-in −24V power for driver.

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AGATE TECHNOLOGY AT2040

Battery operation

The AT2040 is powered by one 6 amp hour, sealed lead acid, rechargeable battery as its

primary power source. This battery is designed to be continuously charged at a trickle rate once

the battery reaches 100%. Battery life will depend on USB plug-ins, payload weight, along with

shaker driving force.

In low power conditions, the AT2040 uses

approximately 0.4 amps of power making it

possible to achieve 13 hours of battery power.

However, the AT2040 will shut down premature

to full discharge preventing damage and

ensuring long-term battery life.

During long periods of high power

consumption, the AT2040 may only last up

to one hour.

A battery light indicator is located in the top

menu bar and turns from green to red as the

battery becomes low on energy. Next to the

battery bar, is an approximate percentage of

battery remaining. See the included voltage

chart (Table 4).

The AT2040 may be operated with the power

plugged in. The AC charger will supply battery

charge when plugged in; however, the charge

rate will be greatly increased when the AT2040

is powered o.

NOTES:

• For best results use the AT2040 when the battery is fully charged.

• Automatic power management will automatically turn o before full battery discharge. This

is a protective measure to ensure longer battery operating life.

• If deep discharge occurs, the battery charger is set to recharge over two or more days.

This is normal operation to prevent battery damage.

AT2040 accessories

Description Part No. Quantity

Short-Handle Aluminum Wrench ACC-100 1

5⁄32 Hex L-Wrench ACC-101 1

¼-28 Stud MNT-104 1

¼-28 to 10-32 Stud MNT-105 1

¼-28 to 2-56 Adapter MNT-106 1

¼-28 to 6-32 Adapter MNT-107 1

¼-28 to 10-32 Adapter MNT-111 1

Universal Velocity Mounting Adapter with ¼-28 Mounting

Hex Screw

MNT-112 1

Universal Accelerometer Mounting Adapter with ¼-28 Mounting

Hex Screw

MNT-113 1

3-Position Terminal Block Plug, Female PL-3-04 1

2-Position Terminal Block Plug, Female PL-2-05 2

Custom Input DIN Terminal Block Plug, Female PL-DIN-8M 1

10-32 to BNC Low-Noise Adapter Cable CAB-101 1

AC Power Cord (120 V or 220–240 V) PWR-100 or 101 1

USB Memory Drive N/A 1

Table 2. AT2040 standard accessories

Description Part No. Quantity

IEPE Accelerometer 2-Pin Mil to BNC Adapter Cable CAB-102 1

IEPE Accelerometer 3-Pin Mil to BNC Adapter Cable CAB-103 1

Chadwick-Helmuth/Honeywell Velocimeter Cable CAB-107 1

Replacement Studs (3 of each): ¼-28, 10-32;

Adapters: 2-56, 6-32, 10-32

MNT-100 1

¼-28 Adapter MNT-108 1

Mounting Stud ¼-28 to 8-32 MNT-109 1

Adapter ¼-28M to ⅜-24F MNT-110 1

Proximity Probe Adapter Kit PRX-100 1

Proximity Probe Proximity Adapters M6 to ⅜ PRX-101 1

Steel Target (4041) PRX-102 1

Table 3. AT2040 optional accessories [5]

[5] Custom cables or platform mounts can be made to your specications based on transducer sample or

datasheet. Please contact us for more information.

Table 4. Battery remaining by voltage

Voltage State of Charge

12.6+ 100%

12.5 90%

12.42 80%

12.32 70%

12.20 60%

12.06 50%

11.9 40%

11.75 30%

11.58 20%

11.31 10%

10.5 0%

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AGATE TECHNOLOGY AT2040

AT2040 Menu

Main Menu Screen Submenu Screens Available

Shake Button • Run Manual Shake Screen

Test Button • Sensor Type Selection Menu

• Manufacturer Selection Menu

• Sensor Model Selection Menu

• Sensor Prole Screen / Auto or Manual Test Selection

• Run Auto Test Screen

• Run Manual Test Screen

Setup Button • Previous Test List / Export PDF or CSV to USB Screen

• Location / Time Setup Screen

• Network Conguration Screen

• Company / Touchscreen Setup Screen

• Certication Template Import / Export Screen

Simulation Signals

Button

• Sensor Type Selection Menu

• Manufacturer Selection Menu

• Sensor Model Selection Menu

• Run Simulation Screen

Table 5. AT2040 menu and submenus

Operation instructions

Powering the AT2040 on and o:

• Press and hold the red On/O button for 1 second. The AT2040 will begin its startup

sequence.

• Press and hold the red On/O button for 5 seconds to power o. When the screen goes

blank, the AT2040 has powered down.

Main Menu Screen Overview

Figure 4. AT2040 main menu screen

A. Shake Button: Select to manually test a transducer or equipment using only variable

frequency and amplitude.

B. Test Button: Select to test transducer sensitivity, using either manual adjustment or

automatic plot.

C. Setup Button: Select to customize the AT2040 options to your preferences.

D. Simulation Signals Button: Select to simulate the signal of a transducer.

E. Battery Indicator: Shows remaining battery level. See Battery Operation on page 13.

F. Screen Title: Indicates action(s) to be performed on the current screen.

G. Date / Time: Shows the current date and time.

H. Software Version: Shows the current software version.

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AGATE TECHNOLOGY AT2040

Shake Mode

Shake mode is used to manually test a transducer or equipment using only variable frequency

and amplitude control. Shake mode can be used to set up a new system, verify an existing

system, or troubleshoot an alarm.

In this mode, the frequency and amplitude are set manually by the operator, while the computer

provides high-accuracy measurement signals.

1. From the main menu, select Shake to open the shake mode screen (Figure 5).

Figure 5. Choose "Shake" from the main menu

2. Select your sensor and mount it to the ¼-28 drill hole in the reference accelerometer.

a. Hold the reference accelerometer with the provided short-handle wrench and screw

in the sensor at the same time.

b. When necessary, use the correct sensor adapter for your size.

Navigating the AT2040 Menu

The AT2040 interface may be navigated using the touchscreen, the two knobs on the front

panel, or a combination of these two methods.

Using the Frequency and Amplitude Knobs

In addition to adjusting the frequency (right knob) and the amplitude (left knob), the two knobs

can be used to navigate the onscreen menu:

1. Turn the frequency knob to move up or down through the onscreen options.

2. Press the frequency knob to choose the currently selected (highlighted) submenu, button,

text eld, check box, list option, or adjustable display window.

3. Press the amplitude knob to go back to the previous screen.

Using the Touchscreen

Tap a submenu, button, text eld, check box, list option, or adjustable display on the

touchscreen to select it.

Using the Adjustable Displays

Tap the adjustable display on the touchscreen, for example the amplitude display, to bring up

the number pad and type in the desired test point.

Editing a Text Field

1. Tap the white editable text eld you wish to edit, or use the frequency knob to select it.

2. Use the keyboard that opens to enter the desired text.

Using the Keyboard and Number Pad

1. Tap the key on the keyboard or the key on the number pad to clear one

character, or tap the key on the number pad to reset the current entry.

2. Tap the key on the keyboard or the key on the number pad to save the entry

and close the keyboard or number pad.

3. Tap the key on the keyboard or the key on the number pad to cancel.

Using Toggle Buttons

Toggle buttons have labels which change depending on their state, for example, the "Start/Stop"

button. Before a test begins, the button label reads "Start", during a test, the label reads "Stop".

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AGATE TECHNOLOGY AT2040

Conducting a Test in Shake Mode

1. To begin the test (Figure 6):

a. Turn the frequency knob until the Start button is highlighted, then press down on

the knob to select the button and begin the test, OR

b. Tap the Start button on the touchscreen to begin the test.

During the test the amplitude and frequency may be adjusted (Figure 6).

2. To adjust the amplitude:

a. Turn the amplitude knob, OR

b. Tap the amplitude display on the touchscreen to bring up the number pad and input

the desired amplitude.

3. To adjust the frequency:

a. Turn the frequency knob, OR

b. Tap the frequency/RPM display on the touchscreen to bring up the number pad and

input the desired frequency or RPM.

During the test, the values shown in the onscreen amplitude display and frequency/RPM display

may be adjusted (Figure 6):

4. Tap the Units button to toggle though the available units for the amplitude display:

gs, IPS, UM, MM, MILS, MMS, and MSS.

5. Tap the Hz/RPM button to toggle between the available units for the frequency/RPM

display: Hz and RPM.

6. Tap the Stop button, or use the frequency knob to select it to conclude the test.

7. At completion of the test, the test data is automatically saved in the on-board memory and

can be recalled and exported to the USB drive at a later time.

Purewave™ Overview

Purewave is the AT2040 distortion compensation algorithm. The status of Purewave is indicated

by the color of the Reference data point (Figure 6):

• Orange = Not ready.

• Blue = Adjusting.

• Green = Complete.

Shake Mode Screen Overview

F G

Figure 6. Shake mode screen

A. Amplitude Display: Turn the amplitude knob to adjust, or tap the touchscreen display to

bring up the number pad and type in the desired amplitude test point.

B. Frequency / RPM Display: Turn the frequency knob to adjust, or tap the touchscreen

display to bring up the number pad and type in the desired frequency or RPM test point.

C. Units Button: Tap the onscreen button to toggle through the units available for the

amplitude display: gs, IPS, UM, MM, MILS, MMS, and MSS.

D. Hz / RPM Button: Tap the onscreen button to toggle between the available units for the

frequency/RPM display: Hz and RPM.

E. RMS / Reference Display: Displays the RMS value and the reference output (the actual

amplitude at which the calibrator is shaking).

F. AT2040 Output Information:

• Out: Percentage of amplier output capability.

•Mils: Displacement of the electromagnetic shaker in mils.

•THD: Total harmonic distortion.

G. Start / Stop Button: Tap the onscreen button or use the frequency knob to select the

button to start or stop the test.

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