ECC X-RAY 815 Manuale utente

INSTRUCTION

ANUA

MODEL 815 /

815L

X-RAY kVp Meter / Exposure Time Meter

Rev: November 21, 2013

Electronic Control Concepts

PO Box 182,1160 US Route 50

Milford,Ohio 45150-9705 USA

Phone:800-VIP-XRAY

Fax:845-247-9028

sales@eccxray.com | www.eccxray.com

ADivision of US Nuclear Corp

www.usnuclearcorp.com

MODEL 815

X-RAY kVp Meter / Exposure Time

Meter

INSTRUCTION MANUAL

TABLE OF

CONTENTS

Page

DESCRIPTION 3

GENERAL INSTRUCTIONS

SWITCH SETTINGS 4

OPERATION 5

FILTRATION CORRECTION 7

CONNECTIONS 7

BLUETOOTH REMOTE MONITOR 8

STATUS MESSAGES 10

BATTERY REPLACEMENT 10

WARRANTY 11

SERVICE INFORMATION 11

SPECIFICATIONS 12

APPENDIX A 13

DESCRIPTION

The ECC Model 815 X-ray kVp Meter / Exposure Time Meter is used to measure

the maximum or peak accelerating voltage output produced by tungsten X-ray

generators. The ECC Model 815 is a solid-state, digital instrument designed

specifically for service personnel in assessing the performance of radiation

generators. This instrument not only samples the acceleration voltage of x-rays,

but measures the length of an exposure. Having both functions in an instrument

simplifies regular constancy checks of kV. The instrument is used for dental x-

ray units, radiographic and fluoroscopic x-rays.

The Model 815 is available with a low range option (Model 815L). See

specifications section for actual range of both models.

The Model 815 can be used to measure the peak acceleration voltage produced

by half-wave, full-wave rectified x-ray machines as well as DC or multiphase x-

rays. It will accurately use ratios produced by different differentially filtered x-ray

detectors to observe kV levels. When the instrument is being used to measure

the length of an exposure, the operator can also determine the characteristics of

an x-ray. After a reading is obtained, pushing the „Mode‟ button will give the

operator a message indicating if the x-ray is:

1. half-wave, or

2. full-wave, or

3. DC / 3 Phase (constant potential, also for x-rays with more than 3 phase) and,

the exposure time.

When a measurement is being made, the Model 815 has the capability of

automatically determining the type of x-ray that is being measured. It is not

necessary for the user to program correction factors for different types of x-ray

waveforms.

The Model 815 automatically resets at the beginning of each exposure, holding

the reading until the next exposure.

The most convenient way of using the 815 is to place it directly under the x-ray

head. Step back, take the exposure and then observe the reading. Refer to the

section on Operation for information on how to obtain the most accurate

measurements.

Note: With high energy (above 70 kVp) disregard first reading after power on.

It is important that the user be thoroughly familiar with the contents of this

manual before performing any tests on radiation generating equipment. It

is also imperative that the user be thoroughly qualified, and familiar with

safety precautions and other practices relating to radiation generators.

GENERAL

INSTRUCTIONS

SWITCH SETTINGS

In order to keep operation easy and straightforward there are only two switches

on the front panel.

ON/OFF SWITCH

The ON/OFF Switch is used to turn on the instrument. The switch is illuminated,

and the green light will be on when the power is turned on. Remember to turn

the instrument off when not in use to conserve the batteries.

MODE SWITCH

The MODE SWITCH has two functions.

1. When initially turned on, the instrument can be switched to the “High

Resolution” mode.

2. After a kVp reading is obtained, pushing the Mode Switch will provide

additional information.

1. High Resolution / High Speed Modes

When the instrument is first powered on, it is in “Normal” or “High Speed Mode”

which is used for most measurements. When used in Normal Mode the Model

815 inserts a delay of about 22 milliseconds before measuring the kVp. Pushing

the button once will put the instrument into “High Resolution Mode”. In High

Resolution Mode, the delay is approximately doubled. When using the

instrument in High Speed Mode, the x-ray exposure time must set to at

least 40 ms (0.04 sec). When using the instrument in High Resolution

Mode, the exposure must be at least 80 ms (0.08 sec).

When the instrument is put into High Resolution Mode, it will stay in High

Resolution Mode until it is turned off. To get the instrument into High Speed or

Normal mode, turn the power off and then on. There is additional information

about using High Resolution Mode in the Operation section.

2. Additional Information Display

After a measurement, the kVp value will be displayed. Additional information can

be displayed by pushing the mode button momentarily. The instrument will then

sequence through the following information:

•

Waveform Type

•

Exposure Time in milliseconds

And back to kVp.

Waveform type and exposure time will each be displayed for about 1.2 seconds,

and then the display will revert back to kVp. After the Additional Information is

displayed and display returns to kVp, the meter is ready for another reading. If

the battery is low, a „Batt Low‟ message will also appear for 1.2 seconds.

OPERATION

kVp Measurements

To use the Model 815 X-ray kVp Meter for a kVp measurement, in most

instances it is only necessary to turn on the instrument, and then center the

meter‟s target in the light field and make an exposure.

In order to ensure more accurate readings, the following points should be kept in

mind. Refer to Appendix A for more information.

1. Current (mA)

The Model 815 will operate down to approximately 7 mA if the x-ray is focused

properly on the x-ray target. The best accuracy is obtained at 10 to 50 mA.

2. Height

For half wave x-rays (Most dental x-rays) with 7 to 15 mA output, the cone should

be ½ to 2 inches above the instrument.

For x-rays with 25 to 100 mA output, position the x-ray head 8 to 16 inches

above the instrument.

3. Collimation

Collimate the x-ray to approximately 2” by 2” centered on the target on top of the

instrument.

4. Exposure Time

There are two modes requiring different exposure times.

In the Normal or “High Speed Mode”, the exposure time must be at least 0.04

sec (40 ms). Longer exposure times than 50 or 100 ms are not necessarily or

desirable in order to minimize wear and tear on the head and exposure to the

operator. When the instrument is used to measure exposure time, longer

exposure may be tested.

In “High Resolution Mode”, the x-ray exposure time must be at least 0.08 sec (80

ms).

5. Waveform

This instrument measures the maximum or peak accelerating voltage that occurs

during any part of the x-ray exposure except for the first 30 ms which we use as

a delay to make sure the x-ray waveform is stable. The instrument will read and

display the maximum value of the accelerating voltage during the rest of the x-ray

exposure.

6. Initial Reading

The x-ray detectors accumulate charge when the unit is not used. When initially

powered on, the instrument will need one x-ray exposure to work correctly.

Disregard the first reading, especially at higher energies i.e. above about 80 kVp.

Exposure Time Measurements

The Model 815 measures the Exposure Time each time a kVp measurement is

made. To display the Exposure Time after an exposure, momentarily push the

white Mode pushbutton switch. The exposure time will be displayed in

milliseconds (ms). In normal or High Speed mode, exposure times less than 40

ms cannot be measured. The x-ray exposure time must be at least 40 ms. If it is

necessary to measure exposure times less than 40 ms, please contact ECC to

purchase our Model 8700 Digital X-ray Time Exposure Meter.

When the instrument is in High Resolution Mode, exposure times less than 80

ms cannot be measured. The x-ray exposure time must be at least 80 ms. We

recommend using normal mode for all exposure time measurements.

More accurate reading of exposure times are obtained at lower kVp / mA

settings. Many high-energy x-ray exposures have a noticeable decay at the

trailing edge (end) that will be added to the exposure time. We recommend

making exposure time readings at 50 to 80 kV and 25 to 50 mA. Also, the

accuracy specifications apply for measurements greater than 150 milliseconds.

High Resolution

The Model 815 was specifically designed to accurately make measurements with

a short exposure time in order to minimize wear on the x-ray head and exposure

to service personnel. However, there are three conditions where more accurate

readings can be obtained by sampling the x-ray waveform for a longer period of

time.

Slow X-rays - Some x-rays, particularly older models take a relatively long time to

reach peak exposure. In the normal or High Speed mode the instrument waits

22 ms before starting the x-ray measurement. The wait time is doubled in the

High Resolution mode, and the actual measurement time is also doubled.

Some DC and multiphase units come on quickly but have a large overshoot. If

the overshoot lasts more than 22 ms, High Resolution Mode will give a more

accurate reading of the true maximum kVp.

Appendix A has more information about making accurate kVp measurements.

FILTRATION CORRECTION (kVp

Measurement)

The Model 810 Meter is calibrated for tungsten tube x-rays with 1.5 mm of Al

filtering. When the x-ray has different filtration, refer to the table below and make

the appropriate correction to the kVp reading.

At 50 mA

Added

ion

60 kVp

80 kVp

100 kVp

120 kVp

0.31 mm Al

-0.2

-0.5

1 mm Al

-1.1

-1.5

-2.6

-3.0

At 100 mA

Added

ion

60 kVp

80 kVp

100 kVp

120 kVp

0.31 mm Al

-0.2

-0.6

-0.8

-1.7

1 mm Al

-0.9

-1.7

-3.4

For example, if your x-ray has 2.5 mm Al, that is equivalent to 1.0 mm of added

filtration. A reading at approximately 60 kVp, 50 mA will be 1.1 kV high. Subtract

1.1 kVp to get the correct reading.

The values can also be interpolated. For example, when taking a reading at 70

kVp, 100mA with 0.3 mm additional filtration (1.8 mm total), use a correction

factor mid way between -0.2 and -0.6, which is -0.4. Therefore, when taking a

measurement at about 70 kVp, 100 mA with 1.8 mm of Al filtration, subtract 0.4

kVp.

For values below about 50 kVp, the correction factor is minimal and can be

ignored.

CONNECTIONS

No external connections are made to the instrument.

BLUETOOTH REMOTE

MONITOR

This instrument is equipped with a feature that can be used to show output data

on an Android smartphone or tablet using the Bluetooth module in every

instrument. When not using the Bluetooth feature, the unit is used in normal

fashion. In order to use the Remote Monitor, an application (app) must be

installed on your Android phone or tablet.

This feature is installed on Model 815 kVp Meters serial number 646 and up and

Model 820 kVp/mA Meters serial number 329 and above.

This feature is provided as a convenience so that it is not necessary to go into

the x-ray room to observe the meter after each reading. There is also a file save

capability which can assist in recording data.

How to download the app:

1: Open the Google Play Store

2: Search for ECC Remote Monitor

3: Download the App

4: The app will install automatically

Running the App:

When the ECC Remote Monitor app is started, it asks for your permission to use

the Bluetooth capabilities of your Android device, if you deny this request, the

application will close.

Connecting to a device:

The home screen should now be shown, and you may choose to connect to a

device via Bluetooth in the action bar at the top or bottom of the screen

(depending on your device screen size).

You may choose devices by using the menu button in any Android systems

below version

3.0 (Honeycomb). If the ECC device does not appear in the connection menu,

select the scan button and it will appear in the menu if it is within range.

The device name will either be shown as null, or ECC_XXX where “XXX” is the

serial number of the device.

Select the ECC device to connect with it.

The first time you attempt to connect with this device, you will be asked for a

pairing code, which will be „1234‟. A confirmation message will be displayed if the

device has been successfully connected. You may now take an x-ray or mA

measurement.

Data

The data will be displayed on the screen with each reading numbered

sequentially, along with the time each measurement is taken. If an x-ray is taken,

kVp, ms, and a timestamp will be shown.

If you are using a model 820 meter, mA and mAs will also be shown.

Note: when using a model 815 meter, mAs will display as N/A (not applicable).

If the data extends beyond the size of the screen, you may swipe vertically or

horizontally to scroll through it.

Saving Data:

The data collected will be displayed on screen and you may choose to save it on

your SD card or Google drive account. To save the file to your SD card, type the

desired filename in the text box at the top of the screen and press the „save‟

button. If you have a Google account, you may choose to upload the data to your

Google Drive™ cloud storage. Select the „Google Drive‟ button to choose an

account to upload to. To send the file to Google Drive, press the „Upload‟ button,

which will appear after selecting an account.

Changing Accounts: To select a different account, long press (Hold) the

„Upload‟ button until the account selection menu appears.

If you choose to upload the data, a text file with all the information collected will

be stored in your Google Drive cloud storage.

If you saved your file to the SD card, use a file explorer program (search “file

explorer” in Google Play) and navigate to your SD folder. Your file will be there

named as

“the text you chose”.txt.

To clear the data at any time, press the “Clear” button.

Troubleshooting:

If at first, the ECC Remote Monitor application does not function properly, try

exiting and reopening the app. If a Bluetooth connection cannot be made

between your Android and the ECC device, try turning the ECC device off and

on, and then try to connect again with the application.

If the app does not display a readout when taking x-ray measurements, it is

possible that your payment method is still pending. Once the payment is cleared,

your application will be licensed and allow measurement readouts.

If for some reason, the app will not work with your android device, the instrument

can still be used for measurements. You may contact us to report bugs in the

application. If we fail to correct an issue regarding the compatibility of the app

with your device in a timely manner, we may issue you a refund for the purchase

price of the application.

Verified Compatible Devices:

This feature has been tested with the following devices and operating systems:

•

Nexus 7

•

Razor

•

Samsung Galaxy Tab

•

Samsung Galaxy S3

Android operating systems:

•

4.2 (Jellybean)

STATUS

MESSAGES

The alphanumeric display on the Model 815 is capable of displaying messages

along with the output readings that give the user additional information. Each

message is described below:

Rdy Fast - Unit is ready for a reading in Fast mode

RdyHiRes - Unit is ready for a reading in Hi Resolution mode

AlignErr - Alignment Error. Position the Model 815 in the center of the x-ray

beam.

Over Rng - Over Range. The x-ray output is too high. Use a lower mA setting or

increase the distance from the x-ray head to the Model 815.

OvrScale - Over Scale. The output of the x-ray exceeds the measurable range of

the Model 815.

Low Batt - Battery is low. The unit may still be operated for several hours, but

accuracy may suffer. Replace the batteries as soon as possible.

Low Time- The exposure time is too low. Make sure that the x-ray exposure time

is at least 0.04 sec (40ms). When this error occurs, pressing the white button will

not give the user any information about the exposure time or waveform type.

BATTERY

REPLACEMENT

The Model 815 is supplied with 4 AA batteries. Replace the battery when the

"Low Batt" indication shows in the display. Long life alkaline batteries are

available from ECC. We also carry extra long life Lithium batteries. Any

standard AA batteries can be used in the 815. To prolong battery life, turn the

instrument off when not in use.

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