HBM ME50 User manual

A0765-3.0 en/de/fr
4.8 kHz CF Measuring
Amplifier
ME50
Operating manual
Bedienungsanleitung
4,8-kHz-TF-
Messverstärker

English Page 3 −22. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Deutsch Seite 23 −42. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Français Page 43 −63. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

3
ME50
HBMA0765−3.0 en/de/fr
Contents Page
Safety instructions 4. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Measuring Amplifiers on Eurocards ME50 8. . . . . . . . . . . . . . . . . . . . .
2 Electrical Connection 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.1 Transducer Connection 9. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.2 Supply Voltage 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.3 Output 10. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2.4 Supply Voltage for Additional Units 10. . . . . . . . . . . . . . . . . . . . . . . . . .
2.5 Pin Assignment 11. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3 Putting into Operation 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.1 Select Measuring Range 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.2 Bridge Zero Balancing 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
3.3 MR Fine Adjustment 12. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 Individual Settings 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.1 Operational Setting 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.2 Setting the Measuring Range 14. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.3 External Fine Balancing of the MR1 15. . . . . . . . . . . . . . . . . . . . . . . . . .
4.4 Bridge Fine Balancing 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.5 Calibration signal 16. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4.6 Measuring Frequency Range / Cut-off Frequency fco 17. . . . . . . . . . .
4.7 Synchronization 17. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5 Options 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.1 Stabilized Power Supply 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.2 DC-DC Converter 18. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.3 Current Output Module 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5.4 Safety Barriers for use in Hazardous Areas 19. . . . . . . . . . . . . . . . . . .
5.5 Additional Units 19. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 General Notes 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6.1 Disturbances 20. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
7 Component Layout 21. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

4ME50
HBM A0765−3.0 en/de/fr
Safety instructions
In order to ensure sufficient immunity from disturbance only use Greenline
shielding (see HBM’s special publication ”Greenline” Screening Concept, elec-
tromagnetic compatibility of measuring cable, downloadable from the Internet
at http://www.hbm.com/Greenline).
The connection lines’ (≤50 V) minimum insulation strength must be
350 V (AC).
Appropriate use
The ME50 with the connected transducers may be used for measurement and
directly related control and regulation tasks, only. Any other use is not ap-
propriate.
To ensure safe operation, the ME50 may only be used according to the speci-
fications given in this manual. When using the transducer, the legal and safety
regulations for the respective application must also be observed. The same
applies if accessories are used.
General dangers of failing to follows the safety instructions
The ME50 complies with the state of the art and is operationally reliable. If the
device is used and operated inappropriately by untrained personnel, residual
dangers might develop.
Any person charged with device installation, operation, maintenance or repair
must in any case have read and understood the operating manual and the
safety instructions, in particular.
Conditions on site
Protect the device from moisture or atmospheric influences such as rain,
snow, etc.

5
ME50
HBM
A0765−3.0 en/de/fr
Maintenance and cleaning
The ME50 is maintenance-free. Please note the following points when clean-
ing the front panel:
•Remove the mains plug from the socket before cleaning.
•Clean the front panel with a soft, slightly damp (not wet!) cloth. Never use
solvents, since they may damage the labelling on the front panel.
•When cleaning, please ensure that no liquid finds its way into the device or
onto the contacts.
Remaining dangers
The ME50 scope of performance and supply covers part of the measuring-
technology, only. The plant designer/constructor/operator must in addition de-
sign, realise and take responsibility for the measuring-system’s safety such
that potential remaining dangers are minimized. The respective regulations
must in any case be observed. Residual dangers regarding the measuring
system must be specified explicitly.
Markings used in this document:
The marking below warns of a potentially dangerous situation in which failure
to comply with safety requirements can result in death or serious physical in-
jury.
Safety instructions have the following format:
Signal word
Consequences of non−compliance
Preventive measures
−Warning sign: Alerts of a hazard
−Signal word: Designates the degree or level of the hazard
(see table below)
−Type of hazard: Designates the type of source of hazard
−Consequences: Describes the consequences of non−compliance
−Prevention: Indicates how to avoid the hazard

6ME50
HBM A0765−3.0 en/de/fr
Hazard classes per ANSI
CAUTION
NOTICE
Warning sign, signal word Meaning
Designates a potentially hazardous situation
which, if not avoided, could result in death or
serious injury.
Designates a potentially hazardous situation
which, if not avoided, may result in minor or
moderate injury.
Property damage: May result in damage to the
product or its environment.
WARNING
On the module
Meaning: Take into account the data in the operating instructions
More symbols used in this manual
To enable you to use your product in a fast and safe way, the manual uses
standardized symbols and terminology that are explained below.
Symbol:
Meaning: CE mark
The CE mark enables the manufacturer to guarantee that the product com-
plies with the requirements of the relevant EC directives (see Declaration of
Conformity at http://www.hbm.com/HBMdoc).
Symbol:
Meaning: Statutory marking requirements for waste disposal
National and local regulations regarding the protection of the environment and
recycling of raw materials require old equipment to be separated from regular
domestic waste for disposal.

7
ME50
HBM
A0765−3.0 en/de/fr
For more detailed information on disposal, please contact the local authorities
or the dealer from whom you purchased the product.
IMPORTANT
Important information
Indicates important information about the product or about handling the pro-
duct.
TIP
Information / Instructions for use
Instructions for use or other valuable information for the user.
Reconstruction and modifications
HBM’s express consent is required for modifications regarding the ME10
construction and safety. HBM does not take responsibility for damage result-
ing from unauthorized modifications.
In particular, repair and soldering works on the boards are prohibited. If com-
plete componentry is replaced use original HBM components, only.
Qualified personnel
The device may be used by qualified personnel, only; the technical data and
the special safety regulations must in any case be observed. When using the
device, the legal and safety regulations for the respective application must
also be observed. The same applies if accessories are used.
Qualified personnel means: personnel familiar with the installation, mounting,
start-up and operation of the product, and trained according to their job.
Maintenance and repair work on an open device with the power on should
only be undertaken by trained personnel who are aware of the above-men-
tioned dangers.

8ME50
HBM A0765−3.0 en/de/fr
1 Measuring Amplifiers on Eurocards ME50
The Eurocards ME50 are 4.8 kHz carrier frequency measuring amplifiers for
inductive transducers. The standard version is supplied with an AL front panel
(4divs wide). On request, a plastics handle is available instead.
All plug−in cards are delivered without housing or rack frame and without
power supply unit so that an individual setting in an existing 19” rack mounting
system is possible. Owing to the narrow width of the plug−in cards (4 divs =
20.32mm) up to 21 cards can be inserted into a 19” rack. The dimensions and
connecting details correspond to the IEC standards 48D and 297.
All controls necessary for easy operation are accessible from the front.
Individual adjustments are described in chapter four; factory settings are
specified on the back of the Eurocard.

9
ME50
HBM
A0765−3.0 en/de/fr
2 Electrical Connection
2.1 Transducer Connection
Inductive transducers are connected by means of 5−wire circuits.
With transducers in 3-wire technology the sensing leads (gn + gy) not needed.
In this case the contacts 32a+c and 28a+c on the connector must be linked.
For cable lengths >50 m, one resistor with half the bridge resistance value
(BR/2) must be solder into the transducer in place of each feedback bridge. If
the transducers are calibrated in six−wire connection, the resistors must be
solder directly into the sensor circuit.
Measurement diagonale 30c. . . . .
Bridge supply voltage 32a. . . . . . .
Bridge supply voltage 28a. . . . . . .
Sensing line to 28a 28c. . . . . . . . .
Sensing line to 32a 32c. . . . . . . . .
Screen 31a+c. . . . . . . . . . . . . . . . . .
Contact wh
bk
bu
gn
gy
ye
Fig. 2.1: Bridge connection
The required bridge supply voltage is 2.5 V (symmetrical about ground) as set
factory settings. It can be reduced to 1 V by switch S25.
UBBridge resistance Switch S25
2.5 V
(factory settings) RB≥2.5...20 mH
1 V
(for operation with SI01) RB≥6...19 mH
The safety barriers SIO1 must be wired into the connecting lines for
transducers in EEx(1) design. In doing so, ensure that the bridge excitation
voltage is 1 V, and switch S29 is set to 0 position (circle not visible). See
chapter 5 for details.

10 ME50
HBM A0765−3.0 en/de/fr
2.2 Supply Voltage
+14.5...+15.5 V (max.45 mA) . . . . . . . . . . . . .
−14.5...−15.5 V (max.40 mA) . . . . . . . . . . . . . .
operating voltage zero . . . . . . . . . . . . . . . . . . .
The ripple on the supply voltage should not exceed 0.1 V peak-to−peak. The
supply connections are internally protected against reverse polarity. Single
sided connection of the supply voltage should be avoided. The supply voltage
should be kept as low as possible within the permissible range of
"15.6..."25 V in order to maintain the dissipation at a low value.
If a stabilized voltage is not available, the amplifier can be operated by means
of a stabilizer (unstabilized supply) or a DC-DC converter (single-pole supply,
battery; see chapter 5.1 and 5.2).
2.3 Output
Output voltage: "10 V; RL≥5 kΩ . . . . . . . . .
Operating voltage zero . . . . . . . . . . . . . . . . . .
The output is provided for the connection of a display and/or recorders.
A current output is possible optionally (see chapter 5.3).
2.4 Supply Voltage for Additional Units
Stabilised voltages are available to provide current supply for additional units:
+14.5 V...+15.5 V; <50 mA . . . . . . . . . . . . . . .
−14.5 V...−15.5 V; <50 mA . . . . . . . . . . . . . . .
operating voltage zero . . . . . . . . . . . . . . . . . . .
pin15a
pin16a
pin19c
+
pin18c
pin 20a
"
+
pin6c
pin 7a
pin15c
−
−

11
ME50
HBM
A0765−3.0 en/de/fr
2.5 Pin Assignment
St 21
see also chapter 7 (component Layout)
Line b : not connected
cab
64-pin right angle plug
Line a
Line c
Line a :Line c :
1c housing
2c not occupied
3c not occupied
4c not occupied
5c not occupied
6c output
Uadd.=+14.5...+15.5 V; <50 mA
7c MR1 external fine balance (R=5 kOhm)
8c MR1 external fine balance, tap
9c MR1 external fine balance (R=5 kOhm)
10c not occupied
11c not occupied
12c synchronization
13c not occupied
14c not occupied
15c operating voltage zero
16c not occupied
17c not occupied
18c output UA="10 V; R>5 kOhm
19c operating voltage zero
20c not occupied
21c external zero balancing tap
22c not occupied
23c not occupied
24c external zero balancing (R=50 kOhm)
25c external switching from MR1 to MR2
26c external zero balancing (R=50 kOhm)
27c not occupied
28c sensing line F (GN)
29c operating voltage zero
30c measuring signal A (WH)
31c operating voltage zero (YE)
32c sensing line G (GY)
1a not occupied
2a not occupied
3a not occupied
4a DC-DC converter (+9...+35 V)
5a DC-DC converter (0V)
6a not occupied
7a output
Uadd.=−14.5...−15.5 V; <50 mA
8a not occupied
9a not occupied
10a not occupied
11a not occupied
12a not occupied
13a internally connected
14a internally connected
15a supply voltage
+14.5...+15.5 V (standard)
16a supply voltage
−14.5...−15.5 V (standard)
17a not occupied
18a not occupied
19a current output with EM002
20a operating voltage zero
21a zero function, external
22a not occupied
23a not occupied
24a not occupied
25a calibration function, external
26a not occupied
27a not occupied
28a bridge supply voltage C (BU)
29a operating voltage zero
30a assigned with SI01 only
31a operating voltage zero (YE)
32a bridge supply voltage B (BK)

12 ME50
HBM A0765−3.0 en/de/fr
3 Putting into Operation
If the factory settings, such as the coarse measuring range, are retained the
operation is limited to the following points:
3.1 Select Measuring Range
With the factory setting measuring range 1 ("80 mV/V) is always switched
on. Measuring range 2 (calibration at "8 mV/V) can be selected either inter-
nally via DIP switch 24/4 or externally by closing a single-pole change-over
switch to pin 25c against operating voltage zero (see chapter 4.2).
3.2 Bridge Zero Balancing
Carry out bridge zero balancing by means of the screwdriver potentiometers
P23 (fine) and switches S22 (coarse) and S23 (polarity) (see also chapter
4.4).
3.3 MR Fine Adjustment
The fine adjustment of the measuring range is made seperately for both
ranges by means of the screwdriver potentiometers P21 (measuring range 1)
and P22 (measuring range 2). The potentiometers in the front panel permit
corrections of approx. 35 % (related to the set measuring range). As far as
measuring range 1 is concerned, the fine adjustment is also possible via an
external potentiometer (for this see chapter 4.3).
NOTE
P22 must not be altered in order not to detune the manufacturer’s setting
(MR2 "8 mV/V) (see chapter 4.5).

13
ME50
HBM
A0765−3.0 en/de/fr
P21
P22
ME50
S21
P23
S22
S23
Fig. 3.1: Front view ME50

14 ME50
HBM A0765−3.0 en/de/fr
4 Individual Settings
Various factory settings on the measuring amplifier card can be altered. Adap-
tations, which are of no problem, can be carried out by means of the DIP
switch on the board or also by externally wired switching elements. If re-
quested with the order, they can be carried out by the manufacturer.
4.1 Operational Setting
Zero Measure Calibrate
S21
or connect pin 21a to pin 15c
or connect pin 25a to pin 15c
Switch
The transducer signal is switched off in the ”Zero” function, so that the ”Zero
Value” of the amplifier is applied to the output. This function enables amplifiers
to be replaced in measuring chain without the need for rebalancing the bridge
with the unloaded transducer. All that is required is that the amplifier balance
values are noted and then this value is set, if necessary, with P23, S22 and
S23.
4.2 Setting the Measuring Range
Measuring range 1 is set factory settings. Measuring range 2 can be activated
by switching DIP switch S24/4 or by external switching.
Measuring Range S 24/4 Externally
MR 1 = "80mV/V
(factory settings) −
MR 2 = "8mV/V from MR1 to MR2;
connect 25c and 15c
Any alteration to the measuring ranges between "8 mV/V ... "160 mV/V
with UB= 2.5 V or "20 mV/V ... "400 mV/V with UB= 1 V can be made by
means of the DIP switches S26 and S27. For fine balancing see 3.3.

15
ME50
HBM
A0765−3.0 en/de/fr
UB= 5 V MR1:S26 ; MR2:S27 factory settings
Meas. range
(mV/V) 12345678
6.8 9.6. . . . . x o o o o o x o MR 2 "8 mV/V
8.8 12.8. . . . x o o o o o o x
12.0 16.8. . . . o x o o o o x o
15.6 22.0. . . . o x o o o o o x
20.8 29.2. . . . o o x o o o x o
27.2 38.8. . . . o o x o o o o x
36.0 51.2. . . . o o o x o o x o
47.2 67.6. . . . o o o x o o o x
62.4 89.2. . . . o o o o x o x o MR 1 "80 mV/V
82.8 117.0. . . o o o o x o o x
109.0 155.0. . . o o o o o x x o
144.0 205.0. . . o o o o o x o x
o = open, x = closed
4.3 External Fine Balancing of the MR1
An external 5 kΩpotentiometer can be connected for fine adjustment of the
range. This will enable about 35 % correction of the selected range.
Connections:
potentiometer start pin 9c. . . . . . . .
wiper pin 8c. . . . . . . . . . . . . . . . . . . .
potentiometer finish pin 7c. . . . . . . .
R=5 kΩ

16 ME50
HBM A0765−3.0 en/de/fr
4.4 Bridge Fine Balancing
a) Coarse Balancing
The 16-stage switch S22 is used for the coarse balancing carried out from the
front panel; the polarity of the balancing direction can be chosen via switch
S23. The overall balancing range is approximately "80 mV/V.
b) Fine Balancing
The potentiometer P23 is used for the fine balancing ("3.2 mV/V).
c) External Zero Balancing
A balance range of "5 mV/V set by the manufacturer can be passed with an
externally connected potentiometer of 50 kΩ.
Pin assignment:
pin 26c
pin 21c
pin 24c
4.5 Calibration signal
The measuring amplifier ME50 operates on a 5−wire technique, i.e. the
calibration and zero compensation signals are formed from the bridge supply
voltage fed back; thus they are independent of transducer, connecting cable
and pin resistances.
lf necessary, the sensitivity of the measuring amplifier can be adjusted by
means of an internal calibration signal of +8 mV/V with measuring ranges
> 8 mV/V. Here the switch S21 must be kept in the calibration position and the
appropriate value must be set simultaneously by means of the potentiometers
P21 (MR1) resp. P22 (MR2). When using the factory settings calibration
measuring range 2 the setting of P22 must be altered.
R=50kΩ

17
ME50
HBM
A0765−3.0 en/de/fr
4.6 Measuring Frequency Range / Cut-off Frequency fco
The Butterworth low pass of the amplifier has been set to 0 ... 500 Hz (−1 dB)
by the manufacturer. lt can be readjusted by switching the DIP switch S24/3 to
0 ... 2 Hz (−1 dB).
Measuring frequency range S 24/3
0...500 Hz (−1 dB); (factory settings)
fco = 675 Hz (−3 dB)
0...2 Hz (−1 dB);
fco = 2.5 Hz (−3 dB)
4.7 Synchronization
When synchronizing several units of the type ME50 (in the same housing),
one of them has to be set as master; its carrier frequency is used for
reference, the other amplifiers must be set to slave. Pins 12c and 15c of all
amplifiers concerned must be joined for synchronization. The master amplifier
is selected by switch S28.
Synchronization Switch S28
Slave-Amplifier (factory settings)
Master-Amplifier

18 ME50
HBM A0765−3.0 en/de/fr
5 Options
5.1 Stabilized Power Supply
The KM001 module can be used if the amplifier is connected to a symmetri-
cal unregulated supply voltage of "15.6...25.0 V. The module supplies the
two stabilized supply voltages internally to the amplifier. When installing the
KM001 module, attention should be paid to the marking (bridge 3 and bridge 4
on pin 1 and 2).
Pin assignment:
positive pole pin 15a. . . . . . . . . . . . . .
negative pole pin 16a. . . . . . . . . . . . .
supply zero pin 19c. . . . . . . . . . . . . . .
5.2 DC-DC Converter
The manufacturer can mount a DC-DC converter onto the board for the oper-
ation of a single-pole supply voltage (battery). The voltage converter is suit-
able for operation on +9...+35 V (unstabilized).
Pin assignment:
positive pole pin 4a. . . . . . . . . . . . . .
negative pole pin 5a. . . . . . . . . . . . .
The DC-DC converter decouples the internal operating voltages from the sup-
ply voltage.
factory settings
1 2 3
BR3
BR4
I
I
With module KM001
resp. DC-DC converter
1 2 3
BR3
BR4
I
I

19
ME50
HBM
A0765−3.0 en/de/fr
5.3 Current Output Module
The module EM002 can be installed to obtain a current output.
The pin assignment is as follows:
output current pin 19a. . . . . . . . . . . . .
supply zero pin 20a. . . . . . . . . . . . . . .
The power range is switched by the DIP switch 24/5.
Output current; applied S24/5
+4...+20 mA
+20 mA (factory settings)
When using an EM002, current and voltage outputs are not aligned to each
other. The required fine calibration can be carried out from the front panel as
described in chapter 3.
5.4 Safety Barriers for use in Hazardous Areas
For transducer operation in potentially explosive atmospheres the SD01A
safety barriers are used conforming to the protection classes (EEx ia IIC) ac-
cording to EN 50 014 and EN 50 020 (see data sheet).
5.5 Additional Units
The following additional cards are available for the measuring amplifier ME50:
−NE02 automatic zeroing unit
−SE03 peak / last value memory
−GE04 limit switch

20 ME50
HBM A0765−3.0 en/de/fr
6 General Notes
6.1 Disturbances
Certain regulations concerning electrical installation have to be observed in
plants with strongly disturbed supply mains systems. The most important
points are listed up in the HBM leaflet ”Hints for connection/disturbances”. An
extensive summary is given in the installation regulations VDI/VDE 3551. The
extent of certain measures to be taken depends on the specific applications.