METRITEC DENSIT-RT6 Manuel utilisateur
M E T R I T E C G m b H K e e l e n g 1 3 D - 2 4 9 7 5 H u s b y G E R M A N Y
T e l e o n + 4 9 ( 0 ) 4 6 3 4 - 9 3 1 5 7 0 F a x + 4 9 ( 0 ) 4 6 3 4 - 9 3 1 5 7 1
s e r v i c e @ m e t r i t e c . d e w w w . m e t r i t e c . d e
DENSIT-RT6
Hand-probe Densitometer
battery powered
User Manual
ENGLISH
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Content
1. Measurement of the optical density...............................................................................3
2. General description.......................................................................................................4
3. Starting up: Inserting the batteries................................................................................6
4. Measuring mode...........................................................................................................7
4.1. Switching ON.........................................................................................................7
4.2. ZERO adjustment..................................................................................................8
4.3. Measuring procedure.............................................................................................9
4.4. HOLD function.....................................................................................................10
4.5. Switch OFF..........................................................................................................10
4.6. Setting the backlight ............................................................................................11
5. Calibration ..................................................................................................................12
5.1. One-factor calibration procedure..........................................................................15
5.2. Two-factor calibration procedure..........................................................................18
6. Battery indicator..........................................................................................................21
7. Technical data............................................................................................................22
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1. Measurement of the optical density
With radiographic testing, defects in technical equipment or components can be detected on the
basis of differences in density of the developed X-ray films. For quality assurance of the film
evaluation, the degree of blackening is determined as optical density. Optical density is measured
using the transmitted light method according to ISO 5-2 and ISO 5-3.
Optical density is defined by the decimal logarithm of the ratio of the luminance in front of the film
to the transmitted luminance behind the film:
= lg
D= diffuse optical density
L
0
= luminance in cd/m² "in front" of the film (without X-ray film)
L
F
= luminance in cd/m² "behind" the film (with X-ray film)
In practice, this formula means that at a measured density value of D = 1, one tenth (10%) of the
occurring light intensity is transmitted through the film, and a density value of D = 2 means that one
hundredth (1%) is let passed. An optical density value of D = 3 means that the film density lets
through one thousandth (0.1%) of the light intensity.
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2. General description
The DENSIT-RT6 handheld probe densitometer is a precise and reliable instrument for measuring
the density of technical X-ray films. It is used for the standard-compliant evaluation of radiographic
images. The portable densitometer is to be used together with a film viewer. The measured value
for the film density is the diffuse optical density Din the measuring range 0 to 5.
The DENSIT-RT6 consists of a handy measuring instrument and a hand-held probe connected by
a 1 m flexible cable.
Further features:
•sensor aperture 3 mm in diameter
•user-friendly keypad with 5 keys for on/off, measuring and calibrating function
•clear LCD digital display with 3-level backlighting
•powered by standard batteries (type AA)
•robust IP65-housing of plastic provided with a removable shock protection
•CE conformity marking
Handling: Avoid extreme cable buckling to prevent wire breakages. The probe cable is a high-
quality, flexible data cable. Its design and properties are is used as supply and data line. Its design
and properties are primarily intended to ensure functionality andcomfort in using.
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Keypad:
LIGHT
switching cyclically
between 3 levels
of backlighting
(p. 11)
HOLD
Measuring mode:
the last measured
value D is displayed
and frozen
(p. 10)
Calibrating mode:
confirm / save input /
quit
(p. 17, 19f)
UP
function key for
calibrating
(p. 15ff)
DOWN
function key for
calibrating
(p. 15ff)
ERO
ON-/OFF switch
(p. 7 / 10)
ZERO setting button
(p. 8)
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3. Starting up: Inserting the batteries
The DENSIT-RT6 is powered by 4 standard batteries 1.5 Volt
type AA. The required batteries are included in the delivery. For
reasons of transport safety, they are delivered in a separate box.
The battery compartment is located on the bottom of the
device. To insert the battery, first remove the blue shock
protection from the housing. Then loosen the 2 screws of
the battery cover.
Insert the four batteries, making sure the polarity is correct.
Close the cover again and put on the shock protection.
The densitometer is now ready for operation.
When removing and reattaching the blue shock protection, make sure that the probe and the probe
cable are not damaged.
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4. Measuring mode
4.1. Switching ON
Button Operation Display Commentary
press "ZERO" button
↓
program starts:
software version appears
wait for short
↓
"METRITEC" appears
briefly
↓
automatic zero setting
(after power-on)
the present Dvalue
is displayed
V02.0520
METRITEC
D=0.00
D=0.02
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4.2. ZERO adjustment
The diffuse optical density measurement is a relative measurement of the luminance with and
without film density. The reference value for the optical density of the radiographic image is the
luminous surface luminance without X-ray film. This reference value is to be set to zero before
each measurement.
press "ZERO" button
↓
zero setting:
"ZERO" appears briefly
Possible displays:
display okay
zero value has been set:
ready for measurement,
see 3.4
automatic
error display
luminance too low
for measurement
automatic
error display
luminance too bright
for measurement
ZERO
D=0.00
TOO DARK
toBright
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4.3. Measuring procedure
(a) Start with the zero adjustment. Hold the probe exactly vertical to the film viewer's internally
illuminated diffusion plate, as exactly as possible at the point where the X-ray film is to be
evaluated.
press "ZERO" button
↓
zero setting:
"ZERO" appears briefly
zero value has been set
(b) Place the X-ray film on the diffusion plate and hold the probe vertically on the spot where you
want to measure the film density.
read off value
the actual Dvalue
(c) The displayed measured value corresponds to the film density.
ZERO
D=0.00
D=4.38
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4.4. HOLD function
This function can be used to hold a current measured value. The density value is held flashing in
the display.
press "HOLD" button
the last measured
D value is maintained;
flashing display
press again
return to measuring
4.5. Switch OFF
keep "ZERO" pressed
for 3 seconds
device switches off
There should be a pause of about 5 seconds between switching the device off and on again.
D=3.12
OFF
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