Salutron SRT5000 User manual

SRT5000
Surface Roughness Tester
Instruction Manual

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Table of Content
1General introduction.............................................................................................3
2 Working principles................................................................................................5
3 Description of the gauge.....................................................................................6
5 Entry into service ..................................................................................................8
5.1 Measurement preparation.........................................................................................................8
5.2 Turn on/off.................................................................................................................................9
5.3 Selecting parameters.................................................................................................................9
5.4 Measuring................................................................................................................................10
5.5 Calibration ..............................................................................................................................11
5.6 Battery recharge......................................................................................................................12
6. Daily maintenance..............................................................................................12
6.1 Maintenance............................................................................................................................12
6.2 Reparation...............................................................................................................................13
7. Terminology.........................................................................................................13

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1 General introduction
The SRT 5000 is a portable surface roughness tester with
high accuracy, simple handling and a stable performance. It
is widely applicable for testing surfaces of all kinds of metals
and non-metals.
By using a high-speed DSP processor for the data
processing and calculation, measurement and
calculation speed has been improved.
Through the lithium ion rechargeable batteries, it can
work many hours. The gauge can also work while
charging. The charging time is short, while the battery life
is long.
The USB port enables fast battery charging.
If you do not understand any of the technical terms,
please refer to chapter 7 for explanation.

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2 Working principles
When the sensor is making a linear uniform motion along
the test surface, the contact stylus in perpendicular with the
work surface is moving up and down on the work surface. Its
motion is converted into electric signals, which are
amplified, filtered and transformed into digital signals
through A/D. The signals are then processed by the DSP
into Ra and Rz (or Rq and Rt) values before displayed on
the screen.

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3 Description of the gauge
Calibrate Sample

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4 Technical parameters
Measurement Parameters:Ra (ISO), Rz (DIN), Rq, Rt
Units:µm, µinch
Stroke Length(mm): 6
Threshold wavelength (mm): 0.25，0.80，2.50
Measurement Range(µm):
Ra：0.05 ~ 10.0
Rz：0.1 ~ 50
Accuracy: According to ISO Class 3
Tip arc radius:10 µm±1 µm
Touch needle static force measurement: ≤ 0.016N
Force measurement rate: ≤ 800N/m
Sensor guide head pressure: ≤ 0.5N
Battery: 3.7V Lithium Ion battery
Dimension: 106 mm×70 mm×24 mm
Weight: 200g
Working Environment Conditions:
Temperature: -20℃～40℃
Relative Humidity: <90%
Surrounding: no vibration and no corrosive media.

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5 Entry into service
5.1 Measurement preparation
Take out the instrument from the case. The sensor
protector should be closed as indicated below.
Move the switch to the right to open the protector so that
the sensor comes out.

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5.2 Turn on/off
To turn on the device press . The device will turn on
being set as adjusted before shut down. In order to turn of
the device press . If the device will be left unused for 3
minutes, it will shut down automatically.
5.3 Selecting parameters
Before measuring the user should set up following
parameters:
•Measurement method: Ra, Rz, Rq, Rt adjustable using
•Threshold wavelength: 0.25 mm, 0.8 mm, 2.5 mm
adjustable using
•Measuring units: µm/µinch adjustable by holding
for about 2 seconds

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5.4 Measuring
When all parameters are set and the protector is open one
can start measuring. Point the Stylus mark to the
measured area and press the start button on the top of the
gauge. After hearing a signal, the measurement has been
finished and the screen will show the measured value.
Note:
1) During the pickups movement, make sure that the
tester stands stable on the measured surface to
avoid measurement errors.
2) During the sensors return to its starting position, the
tester will not respond to further actions.
3) After a measurement has been taken it is possible to
display the value according to all other
measurement methods (Ra, Rz, Rq, Rt) by pressing
. Note that this conversion is not very accurate. For
precise values one has to set the corresponding
measurement method before measuring.

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5.5 Calibration
We advise you to run a calibration from time to time in order
to ensure stable accuracy. The calibration should be done
using the roughness standard included in the delivery. To
enter calibration mode, the tester has to be turned off. Turn
the tester on by pressing the start button at the top
simultaneously with .The tester will start in calibration
mode as indicated below:
Using the arrow keys adjust the starting value to the value
shown on the roughness standard.
Put the instrument on the scribed line area of the standard
and press the start button.
In order to leave calibration mode, the gauge has to be
turned off.
The user can perform a test measurement on the

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roughness standard after calibration to ensure accuracy.
Note: The roughness standard should be clean before
calibration and test measurement!
5.6 Battery recharge
Plug the charger into the tester’s USB port at the top.
Following symbol will show up indicating charging: .
6. Daily maintenance
6.1 Maintenance
Protect the tester from collision, violent shock，
heavy dust, dampness, oil stain, strong magnetic
fields etc.
Please switch off the gauge if not used to save
energy. Recharge the battery promptly when
necessary.
As the sensor is a sensitive part of the tester
particular care should be taken off it. After each
usage, put on the protector to avoid damages.
Special protection should be given to the roughness
standard provided with the tester to avoid scratches
which may lead to inaccurate calibration.

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6.2 Reparation
If any trouble occurs, the user should not try to dismantle
and repair the gauge himself. The device should be
returned to SaluTron for checking and repair, together with
the roughness standard and a statement describing the
problem. Please get in touch with the technical services
department of our company or one of our sales agent.
7. Terminology
Surface Roughness is a component of surface texture.
It is quantified by the deviations in the direction of the
normal vector of a real surface from its ideal form. If
these deviations are large, the surface is rough; if they
are small, the surface is smooth.
Threshold wavelength is the necessary length for
evaluating the roughness profile. It may consist of one or
more sampling lengths.
Ra (Arithmetic Average) is the arithmetic mean value of
the deviation of the profile within sampling length.

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Rz (Maximum Height of Irregularities) is the distance
between the maximum depth of the profile peaks and the
maximum depth of the profile valley within the sampling
length.
Rq (Root-Mean-Square Deviation of the Profile) is the
square root of the arithmetic mean of the squares of
profile deviation from the mean within sampling length.
Rt (Total Peak-to-valley Height) is the sum of the height
of the highest peak and the depth of the deepest valley
over the evaluation length.

SaluTron Messtechnik GmbH
Dr.-Gottfired-Cremer-Allee 30/7 · D-50226 Frechen
Tel. [phone] · Fax. [phone]
E-Mail: i[email protected] · www.salutron.de