No.99MBH001B1
SERIES No.179
Digi-Derm
Digital coating
thickness gage
User’s Manual
Read this User's Manual thoroughly
before operating the instrument. After reading,
retain it close at hand for future reference.
1 INTRODUCTION
CONVENTIONS USED IN USER'S MANUAL
On Various Types of Notes
The following types of notes are provided to help the operator obtain reliable
measurement data through correct instrument operation.
IMPORTANT • An important note is a type of note that provides information
essential to the completion of a task. You cannot disregard
this note to complete the task.
• An important note is a type of precaution, which if neglected
could result in a loss of data, decreased accuracy or
instrument malfunction/failure.
NOTE A note emphasizes or supplements important points of the
main text. A note supplies information that may only apply in
special cases (e.g.. Memory limitations, equipment configura-
tions, or details that apply to specific versions of a program).
TIP A tip is a type of note that helps the user apply the techniques
and procedures described in the text to their specific needs.
It also provides reference information associated with the topic
being discussed.
Mitutoyo assumes no liability to any party for any loss or damage,
direct or indirect, caused by use of this instrument not conforming
to this manual.
Information in this document is subject to change without notice.
© Copyright Mitutoyo Corporation. All rights reserved.
ii
WARRANTY
In the event that the Mitutoyo Digi-Derm should prove defective in workman-
ship or material, within one year from the date of original purchase for use, it
will be repaired or replaced, at our option, free of charge upon its prepaid
return to us.
This warranty shall not apply if the product has been subject to fair wear and
tear, abuse through misuse or improper use/handling/storage/maintenance/
service/repair or through adaptation/modification by the original purchaser or
any third party without prior written consent of Mitutoyo or as a result of
damage by an actual disaster or circumstances beyond the control of Mitutoyo.
To obtain service under this warranty the product must be returned to the
nearest Mitutoyo Service Center. Any postage, insurance, or shipping charges
incurred in returning the product for service are the responsibility of the
purchaser.
*
This warranty is not transferable and is only valid within the country of the
original purchase.
*
You may have additional rights under the laws of country of original
purchase that do not allow the exclusion of implied warranties or the
exclusion or limitation of certain damages. If these laws apply, Mitutoyo's
limitations and exclusions may not apply to you.
iii
1 INTRODUCTION
CONTENTS
CONVENTIONS USED IN USER'S MANUAL ......................... i
WARRANTY ........................................................................... iii
1 INTRODUCTION .............................................................. 1-1
1.1 Preface ................................................................................. 1-1
1.2 Application ............................................................................ 1-1
1.3 Nomenclature and Function ................................................. 1-2
2 OPERATION..................................................................... 2-1
2.1 Setting Power Source ........................................................... 2-1
2.2 Calibration ............................................................................ 2-2
2.2.1 Zero adjustment..................................................................... 2-2
2.2.2 Gain adjustment .................................................................... 2-3
2.2.3 Notes on calibration .............................................................. 2-4
2.3 Measurement ........................................................................ 2-5
2.3.1 Measurement method ............................................................ 2-5
2.3.2 Holding displayed value ....................................................... 2-6
2.3.3 Outputting displayed value ................................................... 2-6
2.3.4 Rod stand .............................................................................. 2-6
2.3.5 Over indication ...................................................................... 2-6
3 SPECIFICATION AND SAFE-KEEPING .......................... 3-1
3.1 Specifications ....................................................................... 3-1
3.1.1 General specifications ........................................................... 3-1
3.1.2 Output specifications ............................................................ 3-2
3.2 Safe-keeping ........................................................................ 3-4
SERVICE NETWORK
iv
v
1 INTRODUCTION
INTRODUCTION
1
1.1 Preface
The Mitutoyo Digi-Derm is a coating thickness gage of non-destructive
type with a digital display. If it is connected to the Digimatic Mini-
processor, measurements can be printed and processed. Read this op-
eration manual carefully before use.
1.2 Application
1) No.179-741, 179-745 & 179-746
Capable of measuring the thickness of the following types of non-
magnetic plating, films, etc. applied to magnetic materials (Iron,
Nickel, Cobalt, etc.):
•
•
Plating: Gold, Copper, Zinc, Tin, Chromium, Lead, Cadmium, etc.
Paint: Oil-based paint, Lacquer, Synthetic resin, Metallic-coating,
Rubber paint, etc.
•
•
•
Lining: Resin, Rubber, Tar, Glass, etc.
Parkerizing, Metal spraying, Oxide film, and other special film
Film:Metal, Resin, Rubber, Paper or any other non-magnetic film
can be measured using steel base metal as the reference.
2) No.179-755 & 179-756
Capable of measuring the thickness of the following types of non-
conductive plating, films, etc. applied to non-magnetic materials
(Brass, Copper, Aluminum, etc.):
•
•
•
•
Paint: Oil-based paint, Lacquer, Synthetic resin, Rubber paint, etc.
Lining: Resin, Rubber, Tar, Glass, etc.
Oxide film, and other special film
Film: Resin, Rubber, Paper or any other non-conductive film can
be measured using Copper, Brass, or Aluminum base metal as the
reference.
1 - 1
MANUAL No. 99MBH001B
1.3 Nomenclature and Function
1) Main unit
Zero adj. volume
Display
Gain adj. volume
Probe cable
Power sw.
Data output
connector or
Analog output
connector
Inch/mm
conversion
sw.
(179-741)
Hold key
Print key
(except for 179-741)
AC adaptor jack
Battery lid
Rod stand
(Rear view)
MANUAL No. 99MBH001B
1 - 2
1 INTRODUCTION
2) Probe
Stopper
Cable
Knurled sleeve
Bobbin case
Core
Fig. 1
Zero adj. volume
Used to set the display to zero.
Gain adj. volume
Used to adjust the Digi-Derm to indicate precisely the thickness of
calibration film.
Print key
Used to output the displayed value to the connected Digimatic Mini-
processor. (except for 179-741)
Hold key
Holds and releases the displayed value alternately.
Inch/mm conversion sw.
Converts the displayed mm values to inch values and vice versa.
MANUAL No. 99MBH001B
1 - 3
MANUAL No. 99MBH001B
1 - 4
2 OPERATION
OPERATION
2
2.1 Setting Power Source
The Digi-Derm operates from either dry batteries or AC power source.
Perform the following setup with the Digi-Derm turned OFF.
1) Dry Batteries
Use four pieces of R6 (SUM-3). First, remove the battery lid on the
bottom of the case by pushing it in the arrow-marked direction, then set
the batteries over the ribbon in the proper polarity (+/-). Pulling the
ribbon removes the batteries.
Ribbon
Fig. 2
When the low battery indication "ERR" is displayed or "three
decimal point indications" are turned on during operation, replace
the batteries with new ones.
2) AC Power Source
Connect the AC adaptor (Optional) to the AC adaptor jack of the
Digi-Derm, then to the AC power outlet.
2 - 1
MANUAL No. 99MBH001B
2.2 Calibration
Be sure to perform calibration before measurement. Calibration in-
cludes two adjustment: zero adjustment and gain adjustment. The fol-
lowing is a calibration procedure using the provided reference speci-
men as the base metal.
2.2.1 Zero adjustment
(1)Turn the Zero and Gain adj. volume to the approximate center of
each range.
(2)While setting the probe to the specimen surface, turn the Zero adj.
volume until the display becomes zero. When applying the
probe,hold the knurled sleeve of the probe with your fingers and
ensure that the probe is perpendicular, its end completely level
with the specimen surface.
The probe should be applied to a point where a measurement is to be
actually performed.
ZERO
(EX.: metric)
Reference specimen
Fig. 3
(3)Apply the probe to the same point on the specimen as in (2) sev-
eral times in succession, then check that zero is displayed each
time.
MANUAL No. 99MBH001B
2 - 2
2 OPERATION
2.2.2 Gain adjustment
Perform gain adjustment after zero adjustment.
(1)Place the provided calibration film on the reference specimen.
For accurate measurement, use a calibration film of thickness as
close to that of the coating to be measured as possible.
(2)Applying the probe on the calibration film, turn the Gain adj. vol-
ume until the Digi-Derm indicates exactly the thickness as desig-
nated on the film. Refer to 2.2.1 (2) for the way the probe is ap-
plied.
The probe should be applied to the same point as used for "Zero
Adjustment".
SPAN
(EX.: metric)
Calibration film (Ex.: 100µm)
Reference specimen
Fig. 4
(3)Remove the calibration film, then check the zero point (refer to
2.2.1 (3)). Place the film on the specimen again, apply the probe
to the film surface at the same point as applied at (2) several
times, then check that the correct film thickness is displayed each
time.
2 - 3
MANUAL No. 99MBH001B
2.2.3 Notes on calibration
Although the provided reference specimen was used as a base metal in
the above example to explain calibration procedures, use a base metal
identical in material, shape, and thickness with that of the workpiece
for calibration, for improved accuracy in measurement. If such a base
metal is not available, use one as similar in these three characteristics
as possible to the workpiece to be actually measured.
About the base metal size
For a flat-surface base metal, more than 30 x 30mm is recom-
mended to use for reliable calibration, although the portion of
φ5mm (.2") [for 179-741, 179-745 & 179-746 ] or φ8mm (.3")
[for 179-755 & 179-756] can be measured.
1) Material
The material of the base metal used for calibration should be as similar
to that of the workpiece as possible.
2) Shape
The shape of the base metal used for calibration should be as similar
to that of the workpiece as possible. Calibration should be performed
at a point where measurement is to be actually performed.
Ex.:
When taking measurement at point A, calibrate at point A'. The same is
true with the other points in Fig. 5.
Coating
B
B'
A
A'
C
C'
D
D'
Base metal
Workpiece
Fig. 5
3) Thickness
The thickness of the base metal used for calibration should be as simi-
lar to that of the workpiece as possible. But a base metal of over 1mm
in thickness hardly affects thickness measurement.
MANUAL No. 99MBH001B
2 - 4
2 OPERATION
2.3 Measurement
2.3.1 Measurement method
If calibration is complete, the Digi-Derm is ready for measurement. It
will indicate the coating thickness on the point where the probe is ap-
plied. For accurate measurement, the probe should be applied to the
same point as that where calibration was performed.
Calibration the Digi-Derm regularly at appropriate intervals.
1) Measurement on a curved or round surface
The V-grooves of a probe allow exact measurement on a curved or
round surface. For measurement on such surface, calibrate the Digi-
Derm first in the same conditions as those in which measurement is to
be performed, i.e., using a base metal of the same material, shape and
thickness as that of the workpiece.
V-groove
O
R
R
Fig. 6
2) Other notes on measurement
If surface roughness of the base metal is over 3µm Rmax., or the coat-
ing thickness is not uniform, the coating thickness should be deter-
mined as the arithmetical average of several points on the same surface.
2 - 5
MANUAL No. 99MBH001B
2.3.2 Holding displayed value
Pressing the Hold key with the probe applied on the measured surface
holds the display with "H" or "←" (179-741) sigh indication. The
analog output is not held in the HOLD state (179-741). To release the
Digi-Derm from HOLD state, press the key again.
2.3.3 Outputting displayed value
If data print-out and processing are needed, connect the Data output
connector on the Digi-Derm to the Digimatic Mini-processor* (op-
tional) with the cable No. 936937 (optional). To output the displayed
value to the processor, press the Print key on the Digi-Derm (except
for 179-741) or the data entry key on the processor. Data output can
also be performed in the HOLD state.
*179-741 additionally requires the A/D converter.
2.3.4 Rod stand
You can raise the rod stand folded in the bottom of the Digi-Derm so as
to incline the front panel. Since the rod stand can easily become de-
tached, don't use this stand as a carrying handle or for any purpose
other than as a stand.
2.3.5 Over indication
If "OVER" or "Initial display" (179-741) is displayed when the
probe is placed on the measured surface, this means that the thickness
is exceeding the measuring range of the Digi-Derm.
T > Measuring range
T
Coating
Base metal
Fig. 7
MANUAL No. 99MBH001B
2 - 6
3 SPECIFICATION AND SAFE-KEEPING
SPECIFICATION AND
SAFE-KEEPING
3
3.1 Specifications
3.1.1 General specifications
Code No.
179-741
179-745
179-746
179-755
179-756
Workpiece
Non-magnetic coating on
magnetic material
Non-conductive coating on
on non-magnetic material
Range
1.500mm (.05900")
1.000mm (.03930")
Resolution
Accuracy (range)
0.001mm/.00005"
3µm 1 digit
(0-0.1mm)
2µm 1 digit
(0-0.1mm)
2µm 1 digit
(0-0.1mm)
±3%±1 digit
(0.1-1.1mm)
±4%±1 digit
(1.1-1.5mm)
±2%±1 digit
(0.1-1.1mm)
±3%±1 digit
(1.1-1.5mm)
±2%±1 digit
(0.1-1.0mm)
Display
Output
3.5-digit LCD
6-digit LCD
Analog output
(1V/fullscale)
Digimatic Code Output format
(For connection with M-SPC system)
Min. measuring area
φ5mm (.2")
Convex: 3mm (.12")
Concave: 25mm (.98")
φ8mm (.3")
Min. radius of
curvature
Convex: 7mm (.28")
Concave: 25mm (.98")
Min. thickness of
base metal
0.3mm (.012")
Power supply
Power consumption
Battery life
Two-way, four dry batteries of SUM-3 or AC adaptor (6V DC)
Approx.120mVA
Approx. 80 hours under continuous service (When battery
voltage is down,the message "ERR" will be displayed.
Operation temperature
0 - 40°C
Dimensions
Digi-Derm: 180(H) x 100(W) x 44(D) mm (7.1 x 3.9 x 1.7")
Detector: φ15 x 43(L) mm (.6 x 1.7")
Weight
500g (1.1lbs.), includes batteries
3 - 1
MANUAL No. 99MBH001B
Code No.
179-741, 179-745, 179-746
179-755, 179-756
Standard
accessories
• SUM-3 ....................................4
• Carrying case .........................1
• Case for films .........................1
•
•
Base metal, SPC (No. 933038) ...... 1
Calibration film set (No. 945014)
•
•
Base metal, ALP (No. 937305) ..... 1
Calibration film set (No. 945049) . 1
1
25µm
50µm
(No.527599)
(No.527600)
25µm
50µm
(No.527599)
(No.527600)
100µm (No.527601)
250µm (No.527602)
500µm (No.527603)
1000µm (No.527604)
100µm (No.527601)
250µm (No.527602)
500µm (No.527603)
1000µm (No.527604) ....... 1ea.
1500µm (No.685013) ....... 1ea.
Optional
• AC adaptor
accessories
No.528041
For 100V AC.
No.528041A For 120V AC.
No.528041D For 220V AC with West German AC plug.
No.528041E For 240/220V AC without an AC plug
No.936937
No.732135
Connection cable for M-SPC
Probe for small hole
(For 179-741, 179-745 & 179-746 only)
3.1.2 Output specifications
1) Connector pin assignment
9
7
5
3
4
1
10
8
6
2
Fig. 8
Pin No. Signal I/O
Description
1
2
3
4
5
GND
DATA
CK
---
O
O
O
I
Ground
Measurement data
Clock for transmission
Ready for transmission
Request for data transmission
Not used
RD
REQ
6 - 10 NC
---
MANUAL No. 99MBH001B
3 - 2
3 SPECIFICATION AND SAFE-KEEPING
2) Data format
d1 d2 d3 d4 d5 d6 d7 d8 d9 d10 d11 d12 d13
MSD
LSD
All "F" (1111)
decimal point
3 (1100)
Unit
Ordinary
measurement
"F" (1111)
Sign
+: 0 (0000)
: 8 (0001)
Measurement
mm: 0 (0000)
inch: 1 (1000)
-
Fig. 9
Data consists of 13 digits (d1 thru d13); each digit consists of 4 bits.
Data output to a linked data processor or other peripheral is effected via
pin No.2 from d1 to d13 in bit serial, from the LSB (20) to the MSB (23)
for each digit.
3) Timing chart
Using Print key of Digi-Derm
RD
20msec or more
REQ
0.6sec
or less
2sec or less
CK
T0
T1
T2
T
DATA
50
50µsec or more
50
Fig. 10
Using request signal for dmata transmission from the peripheral with-
out using Print key of Digi-Derm
RD
H
2msec or more
REQ
2sec or less
CK
DATA
Fig. 11
3 - 3
MANUAL No. 99MBH001B
3.2 Safe-keeping
For long service life of Digi-Derm, observe the following maintenance
points:
•
Keep the Digi-Derm clean and avoid moisture in the storage loca-
tion.
•
•
•
Do not apply excessive force or shocks to the Digi-Derm.
Turn the Digi-Derm OFF after use.
Remove the batteries from the Digi-Derm when the Digi-Derm is
to be left unused for a long period.
•
Avoid rubbing or excessive pressing of the measuring face of the
probe to prevent scratches or deformation. Wear on the measuring
face degrades measuring accuracy. Check the accuracy of your
Digi-Derm in the following manner: 1) prepare two calibration
films of different thickness (e.g.: 50µm and 100µm); 2) calibra-
tion the Digi-Derm on the provided reference specimen with one
calibration film (e.g.: 100µm); and 3) make sure that the measure-
ments of the other film (e.g.: 50µm) are as accurate as laid out in
"Specification".
MANUAL No. 99MBH001B
3 - 4
3 SPECIFICATION AND SAFE-KEEPING
3 - 5
MANUAL No. 99MBH001B
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