ElektroPhysik MiniTest 600 Operating Manual

Bedienungsanleitung MiniTest 600 Version 2.4 Englisch

© 03/2002 B10-N

Subject to change without notice.

ElektroPhysik Dr. Steingroever GmbH & Co. KG
Pasteurstr. 15
50735 Cologne
Germany

Tel.: [phone]
Fax.: [phone]

web: www.elektrophysik.com
mail: [e-mail]

MiniTest 600

Technical Reference and

Operating Manual

Advancing with Technology ElektroPhysik

ElektroPhysik i

Table of Contents

Table of Contents

1. General Information .................................. 1

1.1 Applications ................................................1

1.2 Description of the gauge ........................... 3

1.3 Equipment ...................................................5

1.4 Probe construction .................................... 5

2. Preparing the MiniTest 600 gauges ........ 6

2.1 Checking the power supply ...................... 6

2.2 Replacing the batteries .............................7

2.3 Start-up functions ......................................8

2.3.1 Total reset....................................................9

2.3.2 LCD segment test ........................................9

2.4 Basic gauge settings .............................. 10

2.4.1 Switching between short-ter m and

long-term modes ...................................... 12

2.4.2 KEYLOCK Function for ZERO- and

CAL-keys (locks calibration keys)............. 12

2.4.3 Activating/deactivating the

LC display light (optional) ......................... 13

2.4.4 Select a measuring unit

‘metric’ - ’inch’ (imperial) ........................... 13

ii ElektroPhysik

Table of Contents

3. Calibration and measurement ............... 14

3.1 General remarks on calibration ............. 14

3.1.1 Methods of calibration .............................. 14

3.1.2 Saving calibration values.......................... 15

3.1.3 Example of calibration .............................. 16

3.1.4 The effects of substrate thickness ............ 17

3.1.5 High-accuracy calibration ......................... 19

3.1.6 Cleaning the measuring point .................. 19

3.1.7 Acoustic signal.......................................... 19

3.1.8 Stabilisation of calibration values. ............ 20

3.2 Points to remember when calibrating ... 20

3.2.1 Activate standard calibration .................... 21

3.2.2 One-point calibration without foil

(zero only)................................................. 22

3.2.3 Two-point calibration

(ZERO with one calibration foil)................ 24

3.2.4 Calibration and measurement with

MiniTest 600 FN........................................ 27

3.2.5 Calibration and measurement on

shot blasted surfaces................................ 28

3.2.6 Adjusting the basic calibration .................. 31

3.3 General remarks on measurement ........ 31

ElektroPhysik iii

Table of Contents

4. Measurement using statistics ............... 32

4.1 Definition of statistical values ............... 33

4.2 Entering a series of measurements

for statistical analysis............................. 34

4.3 Storage capacity overflow ..................... 35

4.4 Display and print-out of the 5
statistical values for a series of

measurements (no single value) ........... 35

5. ‘Delete’ functions .................................... 36

5.1 Deleting the last reading taken .............. 36

5.2 Deleting statistics ................................... 36

7. Interface description ............................... 3 7

8. Accessories ............................................. 38

9. Maintenance............................................. 39

10. Customer service .................................... 39

11. Tr oubleshooting ...................................... 39

12. Example of how to operate the

MiniTest 600 ............................................. 41

13. Technical Data ......................................... 45

iv ElektroPhysik

Table of Contents

13.1 Technical data (metric system).............. 45

13.2 Technical Data (imperial system) .......... 47

ElektroPhysik 1

1. General Information

1.1 Applications

This compact, handy pocket gauge is designed for
non-destructive, fast and precise coating thickness
measurement. The principal appli cations lie in the
field of corrosion protection. It is ideal for
manufacturers and their customers, for offices and
specialist advisers, for paint shops and
electroplaters, for the chemical, automobile,
shipbuilding and aircraft industries and for light and
heavy engineering.

The range of applications is indicated by the probes
available.

- F probes work on the magnetic induction

principle and should be used for non­magnetic coatings such as aluminium,
chrome, copper, zinc, paint and varnish,
enamel, rubber etc., on an iron or steel
substrate; they are also suitable for alloyed
and hardened magnetic steel.

General Information

2 ElektroPhysik

- N probes work on the eddy-current principle

and should be used for insulating coatings
on all non-ferrous metals and on austenitic
stainless steels, e.g. paint, anodising
coatings, ceramics, etc. applied on
aluminium, copper, zinc die-casting, brass,
etc.

- FN probes work on a combination of the

magnetic induction and the eddy-current
principle. One probe only is required for
coating measurement both on ferrous and
non-ferrous metal substrates. When switched
to automatic mode (see 1.2) both principles
are used for coating measurement (the
gauge version MiniTest 600 B is not equipped
with an automatic mode to switch
automatically between the two measuring
principles).

General Information

ElektroPhysik 3

1.2 Description of the gauge

Measured values and user information are shown
on a large, easy-to-read LC display. A display back
light (optional) ensures easy reading of screen data
in poorly-lit conditions. The gauges’ user-friendly
measuring system permits automatic storage of up
to 9 999 readings in one memory matrix for later
statistical evaluation (statistical evaluation is not
possible with MiniTest 600 B).

Note:

- MiniTest 600 FN is equipped with a manual

as well as with an automatic mode.

- The manual mode serves to activate either

the magnetic induction principle (F) or the
eddy-current principle (N) by means of the
arrow keys.

- Owing to a special evaluation algorithm the

correct coating thickness is always shown
after corresponding calibration when the

Description of the gauge

4 ElektroPhysik

gauge is switched to automatic mode working
on ferrous steel as well as on non-ferrous
metal (the gauge version MiniTest 600 B is
not equipped with an automatic mode).

- The statistical values measured on steel or

on nonferrous metal (n, x, s, max, min) are
stored in separate memories.

- All MiniTest 600 gauges are suitable for

particular fields of application, e.g. for
measurement on special geometries. After
storage of the corresponding parameters the
gauge automatically takes them into
consideration.

The portable data printer MiniPrint 4100 allows
immediate printing of measured values and subse­quent printing of the 5 statistical values. The data
printer is connected to the MiniTest by means of a
cable and is instantly ready for use (printing and
statistical evaluation are not possible with MiniTest
600 B).

Description of the gauge

ElektroPhysik 5

1.3 Equipment

Standard gauge including probe(s), 2 alkaline
batteries, zero standards, calibration foils and
operating instructions.

1.4 Probe construction

All probe systems are spring-mounted in the probe
sleeve. This ensures safe and stable positioning of
the probe and even contact pressure. A V-groove in
the sleeve of the probes facilitates reliable readings
on small cylindrical parts.

The probe should be held by the spring-mounted
sleeve.The hemispherical tip is made of hard and
durable material.

Equipment and probe construction

6 ElektroPhysik

2. Preparing the MiniTest 600

gauges

2.1 Checking the power supply

1. 2 x 1.5 volt alkaline-battery or

2 x 1.2 volt rechargeable battery

2. Check battery condition by pressing ON .

- no LC display:

battery missing or batteries charge too low
to illuminate display

- no BAT display:

batteries is sufficiently charged

- flashing BAT display, gauge switches itself

off after about 1 sec:
replace batteries immediately

Checking the power supply

ElektroPhysik 7

If the BAT display flashes during measurement, the
batteries are running low and should be replaced
before the gauge is switched on again. If not, the LC
display will show the permanent BAT warning and
the gauge will switch itself off after about a second.

Note:

Note that the gauge will not make faulty
measurements even if the voltage is very low.

2.2 Replacing the batteries

1. Place the gauge upside down on a suitable

surface.

2. Push the lid of the battery compartment in

direction of the arrow and raise the lid of the
compartment.

3. Remove batteries.

4. Insert new batteries.

5. Replace the battery compartment lid.

Replacing the batteries

8 ElektroPhysik

Caution:

Make sure that the positive and negative poles are
correctly positioned. If not, all data saved to memory
will be lost.

An interval of more than 10 seconds between
removing the old batteries and inserting the new
one will also result in the loss of data (readings,
calibration values, time and date).

2.3 Start-up functions

The MiniTest 600 gauges include a number of
functions that can only be called up or activated
through start-up of the gauge.

Function Key combination

Total reset ZERO + CLEAR + ON

LCD-Test

⇑−

key + ON

Set gauge options ZERO + ON

Start-up functions

ElektroPhysik 9

2.3.1 Total reset

A total reset erases all statistical and calibration data
and the gauge will resume the basic MODI-setting
(ZERO - : / 0, see section 2.4).

1. Switch off gauge.

2. Press CLEAR-, ZERO- and ON

simultaneously.

Total reset is confirmed by a long bleep.

2.3.2 LCD segment test

The LCD segment test enables all sections of the
LC display to be inspected and checked.

1. Switch off the gauge.

2. Hold down the ñ-key, press ON and keep

both keys depressed. As long as the arrow
key is depressed, all sections of the LC
display will be shown.

Total reset and LCD segment test

10 ElektroPhysik

2.4 Basic gauge settings

1. Switch off the gauge, hold down the ZERO

key and press ON.

2. Keep both keys pressed until you hear the

signal. The gauge will now display a pair of
numbers: 1:0 or 1:1.

Note:

If you are using a MiniTest 600 FN, use the arrow
keys to activate the F section (ñ) or the N section
(ò ) or wait 3 seconds until switching between
sections is performed automatically.

3. Press ZERO to move through each of the

table’s function from 1 to 4. Use the arrow
keys to set the option 0 or 1.

4. Press ZERO again to return to measuring

mode.

Basic gauge settings

ElektroPhysik 11

Table of basic settings

Basic gauge settings

Z ero -k e y Arro w -k e y s

↑ ↓

Modi-setting

10wwitch-off

mode

short-term
mode

1 long-term m ode

2 0 key lock

mode for

ZERO C al

off

1keylock

30display light

(option)

inactive

1active

4 0 measuring

mode

metric/mm

1 impe r ia l/in ch

12 ElektroPhysik

2.4.1 Switching between short-term and long-

term modes

The gauge is programd to switch itself off after about
90 seconds of inactivity. This can hinder operations
in certain circumstances. In this case please switch
sto the alternative long-term mode.

To switch the gauge to long-term mode, please refer
to the table of gauge settings in section 2.4.

Adjust to the new mode with the ZERO- and arrow
keys as described.

2.4.2 KEYLOCK Function for ZERO- and CAL-

keys (locks calibration keys)

An accidental recalibration or unintentional offset
input can be prevented by using the KEYLOCK
function.

To activate the KEYLOCK function please refer to
the table of gauge settings in section 2.4. Select
option with the ZERO and arrow keys as described.

Short-term and long-term mode

ElektroPhysik 13

2.4.3 Activating/deactivating the LC display

light (optional)

A switch-on LC display lamp can be supplied as an
optional extra. When activated, it lights the display
for about 2 sec after a reading has been taken.
Please remember that using the lamp requires ex­tra power.

To activate the display light please refer to the table
of gauge settings in section 2.4. Select option with
the ZERO and arrow keys as described.

2.4.4 Select a measuring unit

‘metric’ - ’inch’ (imperial)

Readings can be taken and displayed in metric and
imperial units. To switch from metric units (µm, mm,
cm) to imperials (mils, inch) or vice versa, please
refer to the table of gauge settings in section 2.4.
Select option with the ZERO and arrow keys as
described.

LC display light and selection of measuring unit

14 ElektroPhysik

3. Calibration and measurement

3.1 General remarks on calibration

3.1.1 Methods of calibration

Three different calibration methods are available
for the MiniTest 600 gauges:

- Standard calibration

recommended for even surfaces and for
approximate measurements, i.e. those that
do not require the degree of accuracy of one­point calibration.

- One-point calibration:

set zero without foil
recommended when measuring errors up to

4 % are permitted. The given error range of
the probe of ± 2 µm should also be taken
into account.

Methods of calibration

ElektroPhysik 15

- T w o-point calibration:

set zero and calibrate with one foil
recommended when measuring errors of

between 2 % of the measured value are
permitted. The given error range of the probe
of ± 2 µm should also be taken into account.

3.1.2 Saving calibration values

If the gauge is calibrated for a particular purpose,
the calibration values will be logged in memory until
changed.(See also section 3.1.8, ‘Stabilisation of
calibration values’).

If a calibration is to be altered using the same pro­be, simply carry out a new calibration. This
automatically deletes the previous calibration values
and saves the new ones for immediate use.

Note:

If during the calibration procedure:

- an incorrect reading is taken

Saving calibraton values

16 ElektroPhysik

- an incorrect command is entered

- the gauge is for any reason switched off

calibration cannot be continued. Restart the
procedure from the beginning.

3.1.3 Example of calibration

Calibration is the most important requirement for
accurate measurement. The more closely the
calibration sample matches the product sample, the
more accurate the calibration, and therefore the
reading, will be.

Example:

If a product is to be measured on a steel cylinder,
quality ST37 (mild steel) with a diameter of 6 mm
(0.24"), the calibration of an uncoated sample must
take place on a steel cylinder of similar quality with
the same diameter.

The calibration sample must correspond to the
product sample in the following ways:

Example of calibration

ElektroPhysik 17

- in the radius of curvature of the surface

- in the characteristics of the substrate

- in the thickness of the substrate

- in the size of the area to be measured

For more detailed information please refer to the
technical details in chapter 12.

The point at which the calibration is made on the
calibration sample must always be identical with
the point of measurement on the product itself,
especially in the case of corners and edges of small
components. The precision stand proves invaluable
here.

3.1.4 The effects of substrate thickness

In the case of steel substrates, the thickness is of no
consequence as long as it is greater than the general
measuring range of the probe in use.

In the case of non-ferrous metals, it is sufficient when
the substrate is 50 µm (2 mils) thick and strong

Effects of substrate thickness

18 ElektroPhysik

enough not to give way under the pressure of the
probe tip. A thin layer of aluminium foil can be
suitable, if stuck on a hard base.

The enclosed steel and aluminium zero plates are
for test purposes only and are generally not
recommended for calibration.

Exceptions:

The zero plates may be used for calibration if the
product sample has a smooth, even surface (not
shot-blasted) and

- if steel parts are thicker than 1 mm (40 mils).

In this case, the zero plate may be used for
calibration by laying it on the coated sample.

- if aluminium parts are thicker than 50 µm

(2 mils). In this case the enclosed aluminium
plate may be used for calibration. (Thin layers
of aluminium foil should be stuck to a hard
base.)

Effects of substrate thickness

ElektroPhysik 19

3.1.5 High-accuracy calibration

To achieve high-accuracy readings, it is advisable
to log calibration values (both zero values and
calibration foil values) several times in succession.
In this way the gauge will automatically establish a
mean calibration value. For more details see
sections 3.2.2 - 3.2.4 on calibration.

This method is an obvious advantage when
calibrating on uneven, e.g. shot-blasted surfaces.

3.1.6 Cleaning the measuring point

Before calibration, the measuring point and the pro­be tip must be free from grease, oil, scraps of metal,
etc. .The slightest impurity will affect measurement
and distort readings.

3.1.7 Acoustic signal

Whether the probe is being used for calibration or
for measurement, it must be held in place and not
lifted until the bleep sounds.

High-accuracy calibration and accoustic signal

20 ElektroPhysik

3.1.8 Stabilisation of calibration values.

No recalibration is necessary in changeable
external conditions, e.g. variations in ambient
temperature, as the gauge automatically takes these
into account.

3.2 Points to remember when calibrating

When calibrating according to sections 3.2.2 to 3.2.3,
the basic procedure is always as follows:

1. Start calibration by pressing the appropriate

calibration key (ZERO or CAL).

2. Apply the probe to calibration foil several

times.

3. If necessar y, adjust the value shown on the

LC display to the calibration foil value by
means of the arrow keys.

4. End calibration by pressing the calibration

key again (ZERO or CAL).

Points to remeber when calibrating

ElektroPhysik 21

3.2.1 Activate standard calibration

The probe must be at a distance of at least 50 mm
(2") from metal components.

1. Press ZERO.

2. Press CLEAR.

3. Take readings.

The standard calibration stored in the gauge should
only be used for measurements on even surfaces,
i.e.

a) on steel components made of conventional

construction steel (mild steel)

b) on aluminium components and other non-

ferrous metals e.g. copper, zinc, brass etc.

Note:

It is important to record a sufficient number of exact
zero readings on an uncoated sample. If not, one­point or two-point calibration should be used.

Activate standard calibration

22 ElektroPhysik

3.2.2 One-point calibration without foil

(zero only)

1. Press ZERO to initialise ZERO calibration.

The display will show ZERO (flashing) and
MEAN (steady). MEAN indicates that the
mean value of the readings will be shown on
the display.

2. Place the probe on the uncoated sample

(zero coating thickness) and raise it after the
bleep.

Place the probe on the uncoated sample
several times. The display always shows the
mean value of the previous readings.

To discontinue ZERO calibration, press
CLEAR.

3. Press ZERO to end zero calibration. The word

ZERO will appear on the display (steady).

One-point calibratoin without foil

ElektroPhysik 23

4. Now take readings by placing the probe on

the unknown coating and raise it after the
bleep.

Read off the thickness value.

5. It may be necessary to delete the ZERO

calibration if, for example, an incorrect zero
value is entered. In this case:

a) press ZERO and then CLEAR to delete the

zero calibration and any existing CAL
calibration.

Note:

- This will reactivate the default standard

calibration for use on even surfaces.

- ZERO calibration deletes an already existing

CAL calibration.

One-point calibration without foil

24 ElektroPhysik

3.2.3 Two-point calibration

(ZERO with one calibration foil)

This method is recommended for high precision
measurement and for measurement on small
components and hardened and low-alloy steels.

1. Press ZERO to initialise ZERO calibration

The display will show ZERO (flashing) and
MEAN (steady). MEAN indicates that the
mean value of the readings will be shown on
the display.

2. Place the probe on an uncoated sample (zero

coating thickness) and raise it after the bleep.
Place the probe on the uncoated sample

several times. The display always shows the
mean value of the previous readings.

To discontinue ZERO calibration, press
CLEAR.

Two-point calibration

ElektroPhysik 25

3. Press ZERO to end ZERO calibration. The

word ZERO (steady) will appear on the LC
display.

4. Press CAL to initialise foil calibration.

The display will show CAL (flashing) and
MEAN (steady). MEAN indicates that the
mean value of the readings will be shown on
the display.

5. Lay the calibration foil on an uncoated

sample, place the probe on the foil and raise
it after the bleep.

The thickness of the foil should be roughly
equivalent to the estimated coating thickness.

Place the probe several times on the test
sample. sThe display always shows the
mean value of the previous readings.

Two-point calibration

26 ElektroPhysik

Note:

If, for instance, an incorrect calibration value is
measured by mistake, calibration can be
discontinued by pressing CLEAR. The gauge
returns to the measuring mode using the previous
calibration.

6. Adjust to the thickness of the foil with the

arrow keys.

7. Press CAL to end CAL calibration. CAL will

appear on the display (steady).

8. Now take readings by placing the probe on

the unknown coating and by raising it after
the bleep.

9. It may be necessary to delete the CAL

calibration if, for example, an incorrect
calibration is entered. In this case:

a) Press CAL then CLEAR to delete the CAL

calibration and any existing ZERO
calibration.

Two-point calibration

ElektroPhysik 27

Note:

- This will reactivate the default standard

calibration for use on even surfaces.

- Even while a series of measurements is being

taken, foil calibration can be carried out as
often as necessary. The old calibration will
be overwritten; the ZERO calibration remains
in memory.

3.2.4 Calibration and measurement with

MiniTest 600 FN

The universal probe of MiniTest 600 FN uses both
the magnetic induction (measuring range: 0 ... 3mm
(0 ... 0.12") and the eddy-current principle
(measuring range: 0 ... 2 mm (0 ... 0.08")).

T o select the measuring method, press ON. The word
FERROUS will flash on screen. Press the ñ-key to
select FERROUS, i.e. the magnetic induction
method.

Calibration and measurement with MiniTest 600 FN

28 ElektroPhysik

Press the ò-key to select NON-FERROUS, i.e. the
eddy-current method. If none of the keys is pressed,
the gauge will automatically switch to automatic
mode after about 3 sec.

This mode can be used if the substrate type (steel or
non-ferrous metal) is not known.

Calibration for the automatic mode requires a
previous measurement on the uncoated substrate.
The display will then show FERR or NON-FERR.

For calibration and measurement, proceed as nor­mal according to either 3.2.2 or 3.2.3 or 3.2.5.

For alternating measurements on steel and non­ferrous substrates, calibration must be performed
on uncoated samples of both substrates.
Measurements can then be carried out immediately.

3.2.5 Calibration and measurement on shot

blasted surfaces

The physical nature of shot-blasted surfaces results
in coating thickness readings which are too high.

Measurement on shot blasted surfaces

ElektroPhysik 29

The mean thickness over the peaks can be
determined as follows (note that the statistics pro­gram is of great benefit in this procedure):

Method A

This method should be used for surfaces with a
roughness grade of min. 20 µm (0.8 mils).

1. The gauge should be calibrated according

to the method described in 3.2.2 or 3.2.3. Use
a smooth surface with the same curvature
radius and the same substrate.

2. Now take approx. 10 readings on the

uncoated, shot-blasted surface to obtain the
mean

Xo

.

3. Subsequently, take approx. 10 further

readings on the coated and similarly shot
blasted test sample to produce the mean
value

Xm

.

Measurement on shot blasted surfaces

30 ElektroPhysik

4. The difference

()Xm Xo s−±

is the mean
coating thickness over the peaks; s is the
greater standard deviation of the two values

Xm

and Xo .

Method B

This method should be used for surfaces with a
roughness grade of max. < 20 µm (0.8 mils).

1. Carry out a zero calibration of 10 readings
on a shot-blasted, uncoated substrate. Then
calibrate with a foil on the uncoated substrate.
The foil set should consist of a number of
individual foils of max. 50 µm (2 mils)
thickness each and should roughly
correspond to the estimated coating
thickness.

The coating thickness can be read directly
and should be averaged from 5 ... 10 single
measurements. The statistics function is
useful here.

Measurement on shot blasted surfaces

ElektroPhysik 31

3.2.6 Adjusting the basic calibration

In certain cases it can be of assistance or even im­perative to reset the standard probe calibration e.g.

- if the probe tips are worn

- for special applications.

On request, adjustment of the basic calibration can
be performed by the manufacturer, if necessary with
samples from the customer.

3.3 General remarks on measurement

After careful calibration has been made all subse­quent measurements will lie within the guaranteed
measuring tolerance (see technical data).

Strong magnetic fields near generators or live rails
with strong currents can affect the reading.

When using the statistic program (not available when
using MiniTest 600 B) for obtaining a mean value it
is advisable to place the probe several times in the

General remarks on measurement

32 ElektroPhysik

relevant areas. Any false or freak readings can be
cleared immediately by pressing CLEAR.

The final reading derives from:

1. the statistical calculations and

2. the guaranteed tolerance levels of the
gauge.

4. Measurement using statistics

The MiniTest 600 can calculate statistics from a
series of stored measurements (max. 9 999
readings). The statistical values can be printed out
without a list of corresponding single values (see

4.5). Single values can only be printed out directly

during measurement.
This program automatically stores and evaluates

the readings of a series. The analysis of any one
series appears on the display and on the print-out
as follows:

Measurement using statistics

ElektroPhysik 33

n-values: number of single values
mean (

x

): mean of single values
st.d. (s): standard deviation
max: highest single value
min: lowest single value
At least 2 single values are required to obtain a

statistical analysis which consists of the 5 values
listed above.

4.1 Definition of statistical values

· Mean

x

The mean is the sum of the single values
divided by the number of readings

MEAN =

x

x

n

=

∑

- Standard deviation s (STD. DEV)

The standard deviation measures the
scattering of readings. The greater the

Definition of statistical values

34 ElektroPhysik

scattering, the greater the standard
deviation.

S is calculated from the positive square root
of the scattering s².

Scattering is defined as the sum of the
deviations from the arithmetical mean
squared, then divided by the number of
measured values minus 1.

scattering

s

xx
n

2

2

1

=

−

−

∑

()

standard deviation

ss=

2

4.2 Entering a series of measurements for

statistical analysis

1. The gauge can be used for measurements

immediately after it is switched on. All
readings will be automatically logged to the
statistics program.

Statistical analysis of a series of measurements

ElektroPhysik 35

2. Remember to check whether calibration is

required and/or if any redundant statistical
values need to be erased.

3. To recalibrate, simply overwrite the old

calibration.

4. Any remaining statistical values can be

erased by pressing STATS and CLEAR.

4.3 Storage capacity overflow

If the storage capacity (more than 9 999 values) is
exceeded the 5 statistical values will not be updated,
although measurement can continue.

Subsequent readings will be marked with the error
message E11.

4.4 Display and print-out of the 5 statistical

values for a series of measurements
(no single value)

Each time STATS is pressed the statistical values
will appear in the order N (values), MEAN, ST.D.,
MAX, MIN.

Storage capacity overflow

36 ElektroPhysik

If a MiniPrint printer is connected the statistical values
can be printed out or transferred via a serial interface
to a PC.

The statistical values can be viewed at any time,
even while a series of measurements is being taken.

5. ‘Delete’ functions

5.1 Deleting the last reading taken

Press the CLEAR pad once immediately after a
reading has been taken. A short bleep confirms that
the reading has been deleted.

5.2 Deleting statistics

Press STATS and CLEAR. A short bleep confirms
that the reading has been deleted.

For MiniTest 600 FN the statistics of the F-part and
the N-part are deleted separately.

- The desired measuring procedure in

automatic mode (F-probe or N-probe) is

Delete functions

ElektroPhysik 37

activated through a measurement on the
corresponding substrate (steel for F-probe,
e.g. alumumium for N-probe). Press STATS
and CLEAR. A short bleep confirms that the
statistics of the last measurements have been
deleted.

- Alternatively switch off the MiniTest 600 FN

and activate the F-probe or N-probe by
means of the arrow keys when switching the
gauge on again. Press STATS and CLEAR.
A short bleep confirms that the statistics for
the selected measuring principle have been
deleted.

7. Interface description

The gauge MiniTest 600 can be connected to a PC
with a uni-directional RS232C interface. An RS232
interface connection cable is necessary which can
be ordered from us.

Interface description

38 ElektroPhysik

Interface parameters:

Baud rate: 1200
Data bits: 8
Stop bits: 1
Parity: No

8. Accessories

- In-service carrying case

- Clear-view cover for protection against

mechanical damage.

- MiniPrint 4100, portable data printer

- Connecting cable MiniTest/PC

- Cable to connect MiniTest 600 to MiniPrint

4100, portable printer

- Precision stand for high-precision readings

and measurements on small components

Accessories Maintenance and cu

ElektroPhysik 39

- Accumulator and battery charger 230V AC

or 110V AC

9. Maintenance

The MiniTest needs an occasional battery change
but is otherwise maintenance-free. Used batteries
must be removed from the gauge without delay.

10. Customer service

Please send a damaged or defective gauge to us
directly or forward it via your dealer.

We should be grateful if you could enclose a brief
description of the fault.

11. Troubleshooting

The following list of error messages explains how to
identify and eliminate faults. ”E“ (E = error).

Maintenance and customer service

40 ElektroPhysik

Faults which cause the gauge to switch off:
E 3: Probe defective. This message only appears

immediately after the gauge is switched on.

E 4: Probe is giving unreliable readings

(e.g. as a result of strong fluctuations in the
magnetic field or readings taken on soft
coatings).

E 5: Probe was held too close to metal when

switched on.
E 6: Battery voltage too low.
Error messages displayed for about 1.5 sec:
E 11: Memory full.
If faults occur without an error message appearing,

e.g.:

- the gauge does not switch itself off

automatically

- readings are no longer registered

Troubleshooting

ElektroPhysik 41

- the keyboard does not function properly

- readings illogical

Note:

The quickest remedy is a total reset!

12. Example of how to operate the

MiniTest 600

Gauges available:

- MiniT est 600 F;

- MiniT est 600 N;

- MiniT est 600 FN.
also required: steel or aluminium zero plate

1. Press ON.

- According to probe type, the display will show

FERROUS or NON-FERROUS and µm or

mils.

Operating example

42 ElektroPhysik

1a. Exception: MiniTest 600 FN:
a. FERROUS flashes on the display.
b. Press the arrow keys within the next 3 sec. to

choose between measurements on iron and

non-ferrous materials:

Press (ñ) for measurements on steel (“Ferr”).

Press (ò) for measurements on non-ferrous

metals (“Non-Ferr”).

(If necessary switch off the gauge and start

again).

After 3 sec. the gauge automatically switches

to automatic mode, i.e. after corresponding

calibration, the gauge measures the right

coating thickness on steel as well as on non-

ferrous metals.

2. Press ZERO.

- ZERO flashes on the display

Operating example

ElektroPhysik 43

3. Place the probe several times on the zero

plate.

- F probes on the enclosed steel standard.

- N probes on the enclosed aluminium

standard.

- FN probes either on the steel or aluminium

standard.

4. Press ZERO.

- The display will show ZERO.

5. Now start measurement.
E.g. take a calibration foil, lay it on the zero plate

and place the probe on it several times.
The gauge will now display the calibration foil

thickness, taking into account gauge tolerances.
For increased accuracy calibrate again with one of

the calibration foils.

Operating example

44 ElektroPhysik

6. Press CAL

- CAL flashes on the display.

7. Place one of the enclosed calibration foils

on the zero plate and apply the probe several

times.

8. Adjust to the thickness of the foil with the

arrow keys.

9. Press CAL.

- The display will show ZERO and CAL and

µm or mils.
For further details, please look up the point you wish

to clarify by referring to the Contents (at the front) or
the Index (at the back) of the operating instructions.

Operating example

ElektroPhysik 45

Technical data metric system

13. Technical Data

13.1 Te chnical data (metric system)

Gauge type 600 F

for st e el

substrates

600 FN

for steel and

NE-metal

substrates

600 N

for NE-metal

substrates

Principle magn e t-inductive

eddy-current

Measuring
range

0 ... 3 mm 0 ... 3 mm

(F)

0 ... 2 mm

(N)

0 ... 2 mm

Low range
resolutio n

0.2 mm

Guaranteed
tolerance level

± (2 µm + 2 % of the reading)

Min. radius of
curvature

5 mm convex

25 mm concave

46 ElektroPhysik

Technical data metric system

Min.
measuring
area

20 mm

diameter

20 mm

diameter

20 mm

diameter

Min. substrate
thickne s s

0.5 mm F: 0.5 mm
N: 50 µm

50 µm

Probe
dimensions

150 mm diameter x 62 mm

Power supply 2 x 1.5 V alkaline mignon bat teries,

NiMh accumulator batteries (LR6/AA)

Industrial
standards

DIN 50981, 50984; ISO 2178, 2360;

BS 5411; ASTM B499, B244

Ambient
temperature
gauge

0 ... 50° C

Ambient
temperature
probe

-10 ... 70° C

Dimensions 115 mm x 64 mm x 25 mm

Weight 270 g

ElektroPhysik 47

Technical data imperial system

13.2 T echnical Data (imperial system)

Gauge type 600 F

for steel

substrates

600 FN

for steel and

NE-metal

substrates

600 N

for NE-metal

substrates

Principle magnet-inductive

eddy-current

Measuring
range

0 ... 120

mils

0 ... 120 mils

(F)

0 ... 80 mils

(N)

0 ... 80 mils

Low range
resolutio n

0.02 mils

Guaranteed
tolerance level

± (0.08 mils + 2 % of the reading

Min. radius of
curvature

0.2 inch convex

1.2 inch concave

48 ElektroPhysik

Technical data imperial system

Min.
measuring
area

0.8 inch

diameter

0.8 inch

diameter

0.8 inch

diameter

Min. substrate
thickn e s s

20 mils F: 20 mils

N: 2 mils

2 mils

Probe
dimensions

150 mm diameter x 62 mm

Power supply 2 x 1.5 V alkaline mignon batteries,

NiMh accumulator batteries (LR6/AA)

Industrial
standards

DIN 50981, 50984; ISO 2178, 2360;

BS 5411; ASTM B499, B24 4

Ambient
temperature
gauge

32 ... 122° F

Ambient
temperature
probe

14 ... 158° F

Dimensions 4.53 inch x 2.5 inch x 0.98 inch

Weight 9.5 ozs

ElektroPhysik

Index

A

Algorithm .............................................................. 3

Automatic mode ..................................... 2, 28, 36

B

Basic gauge settings ......................................... 10

Battery condition .................................................. 6

C

Calibration.......................................................... 14

Calibration foil .................................................... 25

Calibration values ....................................... 15, 19

Connecting cable ............................................... 38

Contact pressure.................................................. 5

Cylindrical parts ................................................... 5

D

Default calibration .............................................. 27

Defective gauges ............................................... 39

Delete functions ................................................. 36

Display light ........................................................ 13

Index

ElektroPhysik

E

Eddy-current principle ............................. 2, 3, 27

Error messages .................................................. 39

Example .............................................................41

G

Geometry.............................................................. 4

I

Imperial system .................................................. 47

Imperial unit ........................................................ 13

Insulating coatings ............................................... 2

Interface.............................................................. 37

K

Keylock function ................................................. 12

L

LC display ..................................................... 3, 13

LCD segment test ................................................ 9

Long-term mode ................................................. 12

Index

ElektroPhysik

M

Magnetic fields ............................................ 31, 40

Magnetic induction principle ................... 1, 3, 27

Maintenance ...................................................... 39

Manual mode ....................................................... 3

Mean................................................................... 33

Measuring unit ................................................... 13

Memory............................................................... 40

Metric system ..................................................... 45

Metric unit ........................................................... 13

MiniPrint portable data printer ............................. 4

O

One-point calibration .................................. 14, 22

P

Point of measurement ........................................ 17

Power supply ........................................................ 6

Precision stand ..................................................17

Pressure ............................................................. 18

Probe .................................................................... 1

Probe tip .......................................... 5, 1 8, 19, 31

Index

ElektroPhysik

R

Replacing the batteries........................................ 7

Roughness......................................................... 29

RS232C interface .............................................. 37

S

Sample ..........................................16, 17, 22, 25

Scattering ........................................................... 34

Short-term mode ................................................ 1 2

Shot-blasted surfaces .................................19, 28

Spring-mounted sleeve ....................................... 5

Standard calibration ...................................14, 21

Standard deviation ............................................. 33

Statistical analysis ............................................. 34

Statistical val ues ................................................ 32

Storage capacity ................................................ 35

Substrate thickness ............................................ 17

T

Table of basic settings ....................................... 11

Table of start-up functions .................................... 8

Technical data .................................................... 45

Total reset ...................................................... 9, 41

Two-point calibration .................................. 15, 24

Index

ElektroPhysik

V

V-groove ............................................................... 5

Z

Zero calibration ........................................... 22, 30

Index