Gossen-metrawatt Metrahit 18CIS User Manual
Operating Instructions
METRA 18C
Calibrator
3-348-715-15
5/1.02
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
9)
10)
7)
8)
1)
6)
5)
2)
4)
3)
11)
16)
17)
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2 GOSSEN-METRAWATT
Operating Instructions
(1) LC display
(2) ON/OFF key, cursor right ENTER
(3) Key for digit increment, increasing step
(4) Key for digit decrement, decreasing step
(5) Key for cursor left, EXIT
(6) Functions selector for basic functions
V, mV = V, mV-source
= frequency, pulse
°C = thermocouple (TC) simulation
°C = RTD sensor simulation
W = resistance simulation
mA = mA-SOURCE
mA = mA MEAS, mA SINK
(7) Jack for plug type mains unit
(8) Jacks with automatic interlocking
LC Display
1) 5-digit numeric display, 1st digit indicates type of thermocouple
2) Cursor field
3) Menu guidance symbols for basic functions
SOURCE = source, i.e. simulation of signals
SINK = sink, i.e. for simulating a 2-terminal transmitter
4) Measurement units for measured values
5) Menu guidance symbols
TC = basic function ”°C “, for thermocouple simulation
TREF = setting the reference temperature
6) Type of simulated RTD sensor, e.g. Pt100 in the basic function ”°C “
7) FREQ = pointing to the basic function ” “ = frequency or
8) Menu guidance symbols for types of signal output
NUM = numerical entry for the output signal
INT = intervals, output in N steps
RAMP = ramp output
MEM = memory, output from the non-volatile memory
9) N? = request for entry of the number of steps in output type INT
10) Menu guidance symbols for output method MEM using
MAN = number of steps by manual key action
AUT = number of automatic steps with selectable time per step
11) min:s = flashing menu guidance symbol for time entries
12) Menu guidance symbols for output method MEM using
OUT = output from memory
IN = input to memory
13) Number of the memory value or number of the procedure
14) Menu guidance symbols for permissible key operations
EXIT = key (5) for EXIT function (Esc)
ENTER = key (2) for ENTER function
15) MIN and MAX simultaneously
pointing out the ranges with selectable lower and upper range limits
MIN or MAX flashing
Menu guidance symbol when entering the lower range limit (MIN) or
the upper range limit (MAX) for output types INT and RAMP
MAX flashing
Upon entering the upper range limit during current measurement
16) Menu guidance symbol for REMOTE operation via the serial interface
17) ERROR ! = warning symbol for error states
18) = pointing out the inhibited automatic cut-out
19) = indication of "battery low" or for battery voltage indication
GOSSEN-METRAWATT 3
pulse output
= keys (2) and (5) moving the cursor to the right (2)
or to the left (5)
= keys (3) and (4) for menu selection on the same level
modifying digits or step function
Contents
Page
1 Safety Features and Precautions ....................................... 5
2 Putting into Operation ........................................................ 7
3 General Advice for Operation ............................................. 9
3.1 Key Panel ............................................................................. 9
3.2 Menu Structure and Key Operations ..................................... 10
3.3 LC display .......................................................................... 11
3.4 Operating Assistance by the LC Display ............................... 13
3.5 Entering Digits .................................................................... 13
3.6 Non-Volatile Saving of Menu Positions and Configurations .... 14
4 Types of Output Signals ................................................... 15
4.1 Menu Structure .................................................................. 15
4.2 Numerical or Manual Entries for the Output Signal (NUM) ...... 15
4.3 Intervals, Output in N Steps (INT) ......................................... 15
4.4 Output as Periodic Ramp (RAMP) ......................................... 18
4.5 Output from the Non-Volatile Memory (MEM) ........................ 20
4.6 Output by Prozedures Saved in the Non-Volatile Memory ...... 22
4.7 Output via the Serial Interface (REMOTE) .............................. 23
5 Basic Functions ................................................................ 25
5.1 General Notes .................................................................... 25
5.2 Supervisory Circuits ............................................................ 25
5.3 [V, mV], Voltage Source ...................................................... 28
5.4 , Pulse Generator ................................................... 28
5.5 [°C], Thermocouple Simulation ............................................ 31
5.6 [
°C], RTD Sensor Simulation ............................................... 33
5.7 [
W], Resistance Simulation ................................................. 34
5.8 , Current Source ......................................................... 34
5.9 Current Measurement [mA] ................................................. 35
5.10 , Current Drain, Simulation of a Transmitter
with two Leads ................................................................... 36
6 Technical Data ................................................................. 38
7 Maintenance .................................................................... 41
7.1 Batteries ............................................................................ 41
7.2 Housing ............................................................................. 42
8 Appendix .......................................................................... 43
8.1 Errors in [°C] in Thermocouple Simulation ............................ 43
9 Repair and replacement parts service ............................. 44
10 Product Support .................................................................44
4 GOSSEN-METRAWATT
1 Safety Features and Precautions
This chosen instrument will provide a high degree of safety.
The calibrator is designed and tested in accordance with the safety regulations
IEC 61010-1 / DIN VDE 0411.
When used in accordance with the regulations, it will ensure the safety of the
operating personnel and protection of the instrument. However, safety is not
ensured when the instrument is operated improperly or treated carelessly.
To maintain a proper state of safety, and to ensure a hazard-free
use, the operating instructions must be read carefully and completely prior to the use of the instrument, and all points in the operating instructions must be complied with.
For the purpose of personal safety, and for the protection of the instrument, the
calibrator is provided with automatic jack interlocking.
This is coupled with the functions selector, and makes only those jacks accessible
that are required for the selected function. Furthermore, it inhibits switching into
wrong basic functions when the measurement leads are plugged in. Hence, only
the correct polarity of the connection as marked at the jacks need be verified.
Please observe the following safety precautions:
Attention!
The meter has been designed for safe use when not connected to
circuits which conduct hazardous contact voltages of greater than
42 V to earth.
• Never mistake the calibrator for the similarly housed multimeters.
The calibrator is distinguished from the multimeter by its YELLOW jack
sleeves and leads; the multimeter has red jack sleeves and red and black
leads.
• When intending to connect the instrument with a circuit, the absence of haz-
ardous touch voltages must be verified first, if necessary with a multi-meter.
• Please observe the maximum permissible voltages for the protection of the
instrument stated at the jacks.
Except during operation for resistance simulation and mA-SINK, the connected
signal circuits should not feed currents or voltages back into the calibrator.
In order to prevent major damages to the instrument when extraneous voltages
(within the permissible limits) are applied, the measuring circuit for mA-SINK
and mA-SOURCE is provided with a PTC resistor overload protection that turns
these measuring circuits into high resistance ones during the overload period
when higher currents occur during a fault.
Warning!
The instrument shall not be used in explosion endangered zones or
inserted in self-protected circuits.
GOSSEN-METRAWATT 5
Repairs, Exchange of Parts, and Calibration
Voltage-carrying parts can be found exposed when the instrument is opened. The
instrument must be disconnected from measuring circuits before any repair,
exchange of parts or calibration. When repair or calibration work under voltage
and with an opened instrument is unavoidable, then this shall only be carried out
by a skilled person aware of the dangers that may arise.
Faults and Extraordinary Loading
When a continued hazard-free use of the instrument is doubtful, it must be made
inoperable and protected against inadvertent use.
A hazard-free use is no longer ensured when
• the instrument shows visible damage,
• the instrument no longer operates,
• the instrument has been kept in storage under adverse conditions,
• the instrument has been subjected to severe transport conditions,
• measurement leads or probe tips ar e damaged.
6 GOSSEN-METRAWATT
2 Putting into Operation
Inserting Batteries
3 alkaline cells size IEC LR6, 1.5 V / 2.2 Ah are supplied inserted in the instrument. It is ready for operation.
Please note Section 7.1 Maintenance – Battery" prior to operating
the instrument.
In there, the additional statement is made that externally rechargeable batteries
may be used.
One of the accessories is a plug type mains power supply that permits driving the
instrument with power from the mains.
The internal batteries will be disconnected from the circuit when the plug is
inserted into the instrument. Thus, they cannot draw power from the mains power
supply.
Only this plug type power supply that is matched to the instrument
in respect of voltage and power, may be used.
Switching the Instrument On
➭ Press the "ON/OFF" key (2).
The switched-on state is acknowledged by a signalling tone.
Pressing the "ON/OFF" key (2) for a short period will cause the firmware ver-
sion stored in the EPROM and, subsequently, the battery or power supply voltage to be briefly displayed during switching on process, before the instrument
becomes operational in the operational mode selected with the functions
selector (6).
Pressing the "ON/OFF" key (2) for a longer period will cause all segments of
the LC display (1) shown in Section 3.3 to be displayed.
The instrument becomes operational when the key is released.
Attention!
The following can occur when the charge state of the batteries is
low: the internal battery voltage supervision causes the instrument
– not to switch on
– to switch off immediately afterwards
– to switch off when the output is loaded or
the internal change-over selects a higher auxiliary voltage
(e.g. 10/15 V range, 20 mA / 750
See also Section 5.2 and Section 7.1.
In this case, the batteries should be replaced
in accordance with Section 7.1 or
the plug type mains unit may be used, if possible.
When the instrument is operational, the last menu position will be saved in the
non-volatile memory (NVRAM) before the instrument is switched off.
Provided the position of the functions selector has not been changed during the
switched-off period, the instrument will, immediately after switching on, revert to
the menu position used prior to switching off.
Jumping to the highest menu level is achieved in the simplest way by turning the
functions selector into an adjacent position and back.
This switching process is also recommended after wrong menu operations or
uncertainties in respect of the actual menu setting.
W).
GOSSEN-METRAWATT 7
+
Automatic Switching Off
The instrument is switched off automatically, if none of the keys or the function
selector have been activated for a period of approx. 10 min.
Inhibiting the Automatic Switching Off
The instrument can be set to "PERMANENTLY ON".
➭ When switching ON, the "ON/OFF" key (2) and the yellow "ESC" key (5) must
Note:
The function "PERMANENTLY ON" is indicated by the symbol on the LC display (1).
Automatic switching off is inhibited also when the instrument is set to REMOTE
operation via the serial interface in accordance with Section 6.
Switching the Instrument Off
Press the ON/OFF key (2) for at least 1 second.
Note!
Electrical discharge and RF interference may cause incorrect readings and disrupt the measuring sequence.
Then the instrument should be switched off and switched on in a
different position of the functions selector; this will reset the operation of the instrument.
Should this attempt fail, then the batteries should be disconnected
from the circuit for a short period. This can be done by plugging in
the power supply without opening the instrument.
Prior to opening the instrument, the latter must be disconnected
from the circuit to be measured, and Section 7 "Maintenance" must
be observed!
be pressed simultaneously.
8 GOSSEN-METRAWATT
3 General Advice for Operation
3.1 Key Panel
The control operations required for the comprehensive facilities for signal outputs
are executed by using only the four keys (2) to (5) after the basic function has
been selected by means of the functions selector. Their effect depends on the
actual setting of the menu position, but follows a general control principle
described in Section 3.2.
• Switching ON/OFF
ON/OFF
ENTER-function,e.g.
• Entering a sub-menu
(1)
• Loadng an entered number digit
• Moving the cursor to the right
when entering digits
• Incrementing a digit
• Stepping to an adjacent menu
(2)
(3)
on the same menu level
• Starting ramps and interval steps
upwards and stopping them
• Jumping back to the preceding program step (RECORD) under the basic
function PROCEDURES in accordance with Section 4.6
• Decrementing a digit
• Stepping to an adjacent menu
on the same menu level
• Starting ramps and interval steps
downwards and stopping them
• Jumping forward to the next program
step (RECORD) under the basic function PROCEDURES in accordance
with Section 4.6
Esc
EXIT-function, i.e.
• Back to the higher menu level
• Terminating ramps, automatic interval
(4)
GOSSEN-METRAWATT 9
stepping, frequency and back to the
higher menu level
• Moving the cursor left when entering
digits
3.2 Menu Structure and Key Operations
The menu structure is designed on a uniform concept for nearly all basic functions.
The highest menu level comprises the basic functions that can be selected with
the functions selector (6). All other operations are executed by using the 4 keys in
accordance with a structure shown in Figure 1.
Menü 1
Menu 1 Menu 2 Menu A
Esc
Menu 1.1
Menü 1.1
Esc
Other sub-menus depending on the type of operation and output
Weitere Untermenüs je nach Betriebs- und Ausgabeart
1)
1. Key panel menu level of the selected type of operation (ranges or type of sensor)
1)
1. Tastatur-Menüebene der eingestellten Betriebsart (Bereiche oder Sensortypen)
2)
2. Key panel menu level, method of output for the selected range or type of sensor
2)
Figure 1 Concept of the Menu Structure
-
Menü 2
Esc Esc
Menu 1.1 Menu 1.1
Esc
Menü A
Menü 1.BMenü 1.2
Esc
1)
Menus X.Y
Menüs X.Y
X=2-A, Y=1-B
X=2-A, Y=1-B
Esc
The basic function “ “ and the “mA MEAS” function are excepted from
this menu structure.
Furthermore, the following is carried out between the 1st and 2nd menu levels in
the basic functions:
”°C “ selection of the internal and external reference temperature and
its entry, as well as
”°C “ entering the lead resistance
The following functions are associated with the various menu levels:
1st Menu Level 2nd Menu Level Other Menu Levels
Selection of the signal
ranges or of the types of
sensor depending on the
basic function selected
with the functions selector
Selection of the method
of signal output:
NUM = numerical Manual numerical input
INT- = subdivision of a
specified range into a number
of similar steps. The sequence
can be manual (MAN) or automatic (AUTO) with an adjustable
time per step
RAMP = output as an
ascending or descending ramp
with a dwell time at the upper
and lower range limits
MEM = output of 10 signal
values per range or type of
sensor that have been saved
earlier in the non-volatile
memory (NVRAM)
of the output value
Input of the lower and upper
range limits (these are already
defined for the standard r anges
0 ... 10 V, 0/4 ... 20 mA)
as well as entering the number
of steps. Under AUTO:
entering the time per step,
starting and stopping steps
Entering the lower and upper
range limits as well as ramp
duration ( ) and dwell
time ( ) Starting and
stopping the ramps
Entering
signal values into the
non-volatile memory (NVRAM)
and output from the NVRAM
2)
10 GOSSEN-METRAWATT
The menu structure with the functions on the menu levels is printed in an summarizing format (Figure 2) on the underside of the housing.
1st menu level
for the key panel
2nd menu level for the key panel
Other menu levels
Figure 2 Illustration of the Menu Structure Printed on the
Underside of the Housing
3.3 LC display
The LC display is an important element in the user guidance in which, in addition
to numerical displays, various symbols show the actual menu position and give
advice on actions to be taken.
Figure 3 shows the LC display with all its symbols that are displayed during a segment test mentioned in Section 2.
9
8
16
17
kF
12
1
13
2
18 19
Figure 3 LC Display
The symbols have the following significance:
1) 5-digit number display,
1st digit for an additional indication of the type of thermocouple
2) Cursor field
3) Menu guidance symbols for basic functions
SOURCE = source, i.e. simulation of signals
SINK = sink, i.e. for simulating a 4-terminal transmitter
MEAS = measuring the current signal 0 ... 24 mA DC
4) Measurement units for measured values
5) Menu guidance symbols
TC = basic function “°C “, for thermocouple simulation
TREF = setting the reference temperature, (internal or external
6) Type of simulated RTD sensor, e.g. Pt100 in the basic function “°C “
7) FREQ = pointing to the basic function ” “ = frequency
GOSSEN-METRAWATT 11
1415
cold junction)
or pulse output
10
7
11
kF
6
5
4
kF
3
8) Menu guidance symbols for methods of signal output
NUM = numerical entry for the output signal
INT = intervals, output in N steps
RAMP = ramp output
MEM = memory, output from the non-volatile memory
9) N? = flashing menu guidance symbol when entering
10) Menu guidance symbols for output method MEM
MAN = number of steps using manual key operation
AUT = number of automatic steps with selectable time per step
11) min:s = flashing menu guidance symbol for time entries
12) Menu guidance symbols for method output MEM
OUT = output from memory
IN = entry for memory
13) 7-segment digit indicating the number of the memory value output method
MEM or the procedure No. under the basic function PROCEDURE
14) Menu guidance symbols for permissible key operations
EXIT = key (5) for EXIT function (Esc)
ENTER = key (2) for ENTER function
15) Menu guidance symbols
MIN and MAX simultaneously
MIN or MAX flashing
MAX flashing
16) Menu guidance symbol for REMOTE operation via the serial interface
17) ERROR ! = warning symbol for error states
18) = symbol for "PERMANENTLY ON“.
the number of steps in output method INT
for method output INT, AUT and RAMP
= keys (2) and (5) moving the cursor to the right (2)
or to the left (5)
= keys (3) and (4) for menu selection on the same level,
changing digits or step function
pointing out the ranges with selectable lower and upper range
limits on the 1st menu level of the basic functions ”V, mV, mA“
menu guidance symbol when entering the lower range limit (MIN)
or the upper range limit (MAX) for output method INT and RAMP
upon entering the upper range limit during current measurement
19) = indication of "battery low" or for battery voltage indication
kF) = no function, symbols are not used.
12 GOSSEN-METRAWATT
after switching on
3.4 Operating Assistance by the LC Display
Symbols are displayed on the LC display as a function of the selected menu to
support the user of the instrument during the control operation as follows:
• Where am I ?
i.e. confirmation of the basic function and the data functions selected with
keys, e.g. output method and type of quantities to be entered
• Keys for further processing ?
Key operations required for continuing a process are indicated by the menu
guidance symbols (14) in accordance with Section 3.1 Inadmissible key operations are pointed out by a single tone pulse.
• Special events, e.g.
= low battery voltage,
ERROR ! = wrong operational states, pointed out in more detail by
assisting text.
3.5 Entering Digits
Manual entering of numerical values is carried out in the following manner
= moving the cursor to the right (2).
When the cursor is already positioned beneath the last digit, then this
key has the function ENTER for saving the entered value.
= incrementing a digit (3).
Pressing this key briefly will increment the value of the digit by 1.
Keeping this key pressed will increase the indicated value by 1 every
0.4 sec. from the cursor position to the left after a short tone pulse.
= Decrementing a digit (4).
Pressing this key briefly will decrement the value of the digit by –1.
Keeping this key pressed will decrease the indicated value by 1 every
0.4 sec. from the cursor position to the left after a short tone pulse.
= moving the cursor to the left (5).
When the cursor is already positioned beneath the first digit, then this
key has the function EXIT, i.e. the next pressing causes a jump to the
next higher menu level.
• When a digit is incremented from 9 to 0, the next digit to the left is increased
by +1. When decrementing a digit from 0 to 9, the next digit to the left is
decreased by –1 (counting function).
• Each digit entry is limited within a maximum and a minimum in accordance
with the technical data. A change of a digit that would lead to a violation of
these limits, is signalled by a short tone. In this case, the numerical value will
be set to the range limit.
GOSSEN-METRAWATT 13
Example of Entries
Entering the upper interval limit (MAX) = 12 V in the basic function, "V, mV
SOURCE" in the range 0...15 V under the output method "Intervals" (INT).
See also Section 4.2.
Key Operation Display Notes
Various key operations
see Section 4.2
Ready for entering
the MAX value;
Cursor and MAX are
flashing
Cursor to the left;
Further movement to the left
causes a jump back to entering
the MIN value
Further incrementing would set
the value to the upper range
limit of 15 V after a short tone
Moving the cursor to the right
MAX set to 12 V
2x
Key (2) now has the function
3x
of ENTER.
Pressing key would set
the value to 11.999 V
Ready for entering the number
N of intervals
"N?" flashe s
3.6 Non-Volatile Saving of Menu Positions and Configurations
The METRAHit 18Cis fitted with a non-volatile memory (NVRAM) in which current
menu positions (LAST MENU) and configurations remain saved after switching off.
When switched off, the NVRAM is supplied with power from 3 small batteries.
During a battery replacement in accordance with Section 7.1, a special supporting capacitor acts in a bridging function for 3 minutes.
As mentioned in Section 2, the instrument will, when switched on again, resume
exactly the last menu position prior to switching off, provided the functions selector position has remained unchanged. This saves time-consuming key operations
for entering complex menus. Furthermore when used on site, this will
reduce the load on the batteries, when the instrument is switched
off whenever it is not in active use.
In all basic functions, the configurations once set for a range or type of sensor, will
be saved in the non-volatile memory when the instrument is switched off, e.g.
MIN/MAX values in INT, RAMP, RAMP timing.
14 GOSSEN-METRAWATT
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