Gossen MetraWatt METRAHit 28C light Operating Instructions Manual
Operating Instructions
METRA HIT28c light
Calibrator
3-349-317-15
6/2.05
1
1
2
3
4
5
6
8
9
7
No measuring input !
!
Do not apply interference voltage
except current sink
1Display (LCD)
2 ON| OFF key
! Cursor position to the right
Operating mode menu:
↵ (ENTER) Changeover to sub-menus /
3 " Increase values
Operating mode menu: Selection of individual menu items
4 # Decrease values
Operating mode menu: Selection of individual menu items
5 ESC key for selecting ranges or functions
$ Cursor position to the left
Operating mode menu: Exit menu level and return to a higher level,
6 Rotary switch for simulation functions
7 Connector jack for NA5/600 power pack
8 Connector jacks for calibrator output
9 DKD calibration mark, see page 4
acknowledgement of entries
against direction of flow
in direction of flow
exit parameters configuration
without saving data
2
3
4 57
6
13
12 11 11 10 9
8
Symbols used in the Digital Display
1 Main display with decimal point and polarity display
2 Auxiliary display with decimal point and polarity display
3 : Simulator in continuous operation
4 NUM: Numeric entry of output signal
5 INT: Interval sequence active
6 RAMP:Ramp function active
7 ON: Calibrator output is active
8 Unit of measure (if blinking, refer to chapter 13 on page 24)
9 SOURCE: Current source is active
10 SINK: Current sink is active
11 Ni/Pt1000: Selected temperature sensor
12 TC: Thermocouple
13 : Low battery voltage (< 3.5 V), replace batteries
8
2 GOSSEN METRAWATT GMBH
Table of Contents
Page
1 Safety Features and Precautions ...............................3
2 Initial Start-Up ............................................................5
3 Voltage Simulator .......................................................6
4 Pulse and Frequency Generator (positive square-wave
pulse) .........................................................................6
5 Resistance Simulation [Ω] .........................................7
6 Temperature Simulation [°C] .....................................8
6.1 Temperature Simulation of Resistance Temperature
Detectors – Position °C
6.2 Temperature Simulation of Thermocouples – Position °C
. .................................................... 8
RTD
TC
. ..... 8
7 Current Source and Current Sink .............................10
7.1 Current Sink – Simulation of a 2-Wire Transmitter ................. 10
7.2 Current Source .................................................................... 10
8 Interval Functions, Ramp Functions and Procedures 11
8.1 Interval Sequences – INT Function ......................................... 11
8.2 Read-Out a Periodic Ramp – RAMP Function .......................... 14
9 Using the Menus – from the Initial InFO Menu to
Operating Parameters ..............................................16
9.1 Activating the Default Values .................................................18
9.2 Transmission Mode Operation with RS 232 Interface ..............18
10 Accessories ..............................................................19
11 Characteristic Values ...............................................20
12 Maintenance ............................................................23
12.1 Battery ................................................................................. 23
12.2 Power Pack .......................................................................... 23
12.3 Fuses ................................................................................... 24
12.4 Housing ................................................................................ 24
13 Calibrator Messages ................................................24
1 Safety Features and Precautions
You have selected an instrument which provides you with a
high level of safety.
This instrument fulfills the requirements of the applicable
European and national EC guidelines. We confirm this with
the CE marking. The relevant declaration of conformity can
be obtained from GOSSEN METRAWATT GMBH.
The instrument is manufactured and tested in accordance
with safety regulations IEC 61010–1:2001/DIN EN 61010–
1:2001/ VDE 0411–1:2002. When used for its intended purpose, safety of the operator, as well as that of the instrument,
is assured. However, their safety is not guaranteed, if the
instrument is used improperly or handled carelessly.
In order to maintain flawless technical safety conditions, and to
assure safe use, it is imperative that you read the operating instructions thoroughly and carefully before placing your instrument into
service, and that you follow all instructions contained therein.
14 Repair and Replacement Parts Service
DKD Calibration Lab
and Rental Instrument Service .................................25
15 Warranty ...................................................................25
16 Product Support .......................................................25
GOSSEN METRAWATT GMBH 3
Observe the following safety precautions:
• The instrument may only be operated by persons who
are capable of recognizing contact hazards and taking
the appropriate safety precautions. Contact hazards exist
anywhere, where voltages of greater than 33 V RMS may
occur.
Attention!
!
The calibrator has been designed for safe connection
to signal circuits.
Maximum allowable voltage between connector jacks (7)
amongst themselves and earth is 15 V.
If U
or I
max
blows.
is exceeded, the integrated 250 V fuse
max
• Be prepared for the occurrence of unexpected voltages
at devices under test (e.g. defective devices). For example, capacitors may be dangerously charged.
• Make certain that the measurement cables are in flawless
condition, e.g. no damage to insulation, no interruptions
in cables or plugs etc.
• No functions may be performed with this instrument in
electrical circuits with corona discharge (high-voltage).
•
For this reason,
never confuse a
calibrator with a
multimeter.
• When necessary, use a multimeter to make sure that no
dangerous contact voltages are present in the signal circuits to which the instrument is to be connected.
• In order to prevent damage to the instrument, observe
the maximum allowable voltage and current values indicated at the jacks.
With the exception of the resistance simulation and mA
SINK operating modes, the connected signal circuits
should not feed any voltage or current back to the calibrator.
In order to avoid damage to the instrument when interference voltages are applied (within allowable limit values),
the mA SINK and mA SOURCE measuring circuit is
equipped with a fuse F3, which makes this measuring
circuit highly resistive if excessive current should occur in
the event of a fault for the duration of overloading.
Meanings of symbols on the instrument
!
Warning concerning a source of danger
(Attention: observe documentation!)
Earth
Continuous, doubled or reinforced
insulation
Indicates EC conformity
DKD calibration mark (red seal):
B0730
DKD-K19701
01-08
Consecutive number
German Calibration Service - Calibration Laboratory
Registration number
Date of calibration (year–month)
Repair, Parts Replacement and Balancing
When the instrument is opened, voltage conducting parts
may be exposed. The instrument must be disconnected from
the circuit before the performance of repairs, the replacement
of parts or balancing. If balancing, maintenance or repair of a
live open instrument is required, this may only be carried out
by trained personnel who are familiar with the dangers
involved.
Defects and Extraordinary Strains
If it may be assumed that the instrument can no longer be
operated safely, it must be removed from service and
secured against unintentional use.
Safe operation can no longer be relied upon,
• If the instrument or the test probes are damaged
• If the instrument no longer functions
• After long periods of storage under unfavorable
conditions.
Warning!
The instrument may not be operated in explosive atmospheres, or connected to intrinsically safe electrical circuits.
4 GOSSEN METRAWATT GMBH
2 Initial Start-Up
Battery operation
Be certain to refer to chapter 12.1 regarding correct battery
installation.
Switching the Instrument Off Manually
➭ Press and hold the ON|OFF key until OFF appears at the
display.
Shutdown is acknowledged with two brief acoustic signals.
Attention!
!
As a result of internal battery voltage monitoring, the
instrument may respond as follows if the battery
charge level is low:
– Cannot be switched on
– Shuts back down immediately
– Shuts back down in the event of loading at the
output.
If this is the case, replace the batteries in
accordance with chapter 12.1, or continue
work with the power pack if possible.
Operation with mains adapter
(accessory equipment, not included as a standard feature)
During power supply via mains adapter NA5/600, the
inserted batteries are cut off electronically so that they rmay
remain in the instrument, see also chapter 12.2. If rechargeable batteries are used, they must be charched outside the
instrument.
Switching the Instrument On Manually
➭ Press the ON| OFF key.
Power-up is acknowledged with a brief acoustic signal.
As long as the key is held depressed, all of the segments
at the liquid crystal display (LCD) are illuminated. The
LCD is shown in the diagram on page 3.
The instrument is ready for calibration as soon as the key
is released.
Switching the Instrument On with a PC
After transmission of a data frame from the PC, the simulator
is switched on. See also chapter 9.2.
Automatic Shutdown of the Calibrator
The simulator deactivates the output quantity after 5 minutes
of inactivity. 5 minutes later, the instrument is switched off.
Shutdown is acknowledged with a brief acoustic signal.
The continuous operation mode is not affected by automatic
shutdown.
Disabling Automatic Shutdown
The instrument can be set to continuous operation.
➭ Press and hold the ESC|FUNC key and then switch the in-
strument on by pressing the ON|OFF key. Continuous operation is indicated at the display with the symbol.
Note!
☞
Electrical discharge and high frequency interference
may cause incorrect displays to appear, and may disable the simulator. In such cases, switch the instrument off and back on again in order to reset. If the
problem persists, briefly dislodge the battery from the
connector contacts.
Setting Time and Date
See chapter 9 on page 16.
GOSSEN METRAWATT GMBH 5
3 Voltage Simulator
The instrument includes the following simulator functions:
Direct voltage V DC, frequency f, resistance Ω, temperature
°C (for resistance thermometers or thermocouples) and current mA DC.
#"
$ !
Voltage
Simulator Value
1.3520
0.,3-15
NUM ON
V
V
4 Pulse and Frequency Generator (positive square-wave
pulse)
#"
$ !
Frequency
0100.0
05.000
(... 3x) (... 4x)
NUM ON
V
↵
ESC
Hz
Hz
↵
NUM ON
#"
Voltage
Range
Voltages can be simulated within the following ranges:
0 … ±300 mV, 0 … 3 V, 0 … 10 V and 0 … 15 V.
The resistance of the interconnected circuit should not be any
less than 1 kΩ.
➭ Connect the DUT with the measurement cables as
shown.
–
➭ Select the V calibration function with the rotary switch.
➭ Setting the voltage simulation value:
Press $! keys to select the decade, i.e. the position of
the digit you wish to change, and press #" keys to set
the respective digit.
➭ Changing the voltage simulation value:
Press the ESC key until you proceed to the voltage range
sub-menu. Press #" keys to set the respective digit.
Press ↵ key to return to the main menu.
0 .3- 15
sele t range
CALIBRATOR
Output
+
DUT
e. g.
Measuring transducer
ESC
–
+
(... 2x)
V
Input
#"
$ !
Voltage
Amplitude
05.000
0100.0
#"
Voltage
Range
Voltage and frequency can be generated independent of one
another with the frequency generator.
The output signal is a square wave. The resistance of the
interconnected circuit should not be any less than 1 kΩ.
➭ Select the /Hz calibration function with the rotary
switch.
➭ Setting voltage amplitude (0 … 15 V):
Press the ESC key until you proceed to the menu for setting voltage amplitude.
The decade (i.e. the position of the digit to be changed) is
selected with the $! keys, and the respective digit is
set with the #" keys.
➭ Changing the voltage simulation range:
Press the ESC key until you proceed to the voltage range
sub-menu. Press #" keys to set the respective digit.
Press ↵ key to return to the main menu.
➭ Setting the frequency value (1 … 1000 Hz):
Press ↵ key until you proceed to the frequency main
menu. Press $! keys to select the decade, i.e. the po-
sition of the digit you wish to change, and press #"
keys to set the respective digit.
0 .3- 15
sele t range
NUM ON
↵
NUM ON
ESC
V
Hz
(... 3x)
V
6 GOSSEN METRAWATT GMBH
Frequency settings of 29 Hz and greater can only be selected
in a limited fashion.
Note!
☞
The following error messages may appear:
“HiCurr” (high current – current at overload limit)
where I
(out of limits – limit value violation) where I > 30 mA.
The simulator is switched off.
Attention!
!
In this operating mode interference voltages must not
be applied to the calibrator jacks.
In the event of operating errors, such as the shortterm application of a high interference voltage, the instrument/calibrator is protected by a replaceable
fuse F3, see chapter 12.3.
= 18 mA, “0ut 0l” and 3 acoustic signals
max.
5 Resistance Simulation [Ω]
Resistance can be simulated by means of 2-wire connection
within the following range: 5 … 2000 Ω.
Note!
☞
The following error messages may appear:
“HiCurr” (high current – current too high) where
I > 4.5 mA and “LoCurr” (low current – current too low
or polarity reversal)
where I < 40 µA (i.e. open jack sockets).
Attention!
!
In this operating mode interference voltages must not
be applied to the calibrator jacks.
In the event of operating errors, such as the shortterm application of a high interference voltage, the instrument/calibrator is protected by a replaceable
fuse F3, see chapter 12.3.
After applying the measuring current it takes a maximum of
30 ms for the calibrator output to adjust to the specified
resistance value.
Incorrect measured values may result in conjunction with
DUTs which do not have a steady measuring current (e.g.
scanned measuring inputs) if measurement has already been
started during setting time. The calibrator cannot be used for
such objects.
#"
$ !
Resistance
➭ Connect the DUT with the measurement cables as
shown.
2-Wire Resistance Simulator
DUT
➭ Select the Ω calibration function with the rotary switch.
➭ Setting the simulation value:
The decade (i.e. the position of the digit to be changed) is
selected with the $! keys, and the respective digit is
set with the #" keys.
GOSSEN METRAWATT GMBH 7
1454.5
–
+
NUM ON
Ω
2l
CALIBRATOR
Output
–
Input
Measuring current 50 µA ... 5 mA
+
6 Temperature Simulation [°C]
Resistance temperature detectors (RTD) and Thermocouples
(TC) with specified external reference junction temperature
can be simulated.
➭ Select the °C calibration function with the rotary switch.
➭ Connect the DUT with the measurement cables as
shown.
➭ unit of measure °C or °F can be selected with the ESC
key.
6.1 Temperature Simulation of Resistance Temperature
Detectors – Position °C
Resistance temperature detectors are simulated by means of
resistance values.
➭ Selecting sensor type:
Press the ESC key until you proceed to the sensor selection sub-menu.
Select either type Pt100, Pt1000, Ni100 or Ni1000 with
the #" keys for the simulation of an RTD. Press the
↵ key to return to the temperature simulation value main
menu.
➭ Setting the temperature simulation value:
The decade (i.e. the position of the digit to be changed) is
selected with the $! keys, and the respective digit is
set with the #" keys. Alternatively, you can press the
#" keys at any entry position until the higher ranking digits are changed as well.
Pt100/1000
Ni100/1000
sensor
RTD
.
°C
ESC
#"
Sensor
Selection
#"
$ !
Temperature
Simulation Value
After applying the measuring current it takes a maximum of
30 ms for the calibrator output to adjust to the specified
resistance value.
Incorrect measured values may result in conjunction with
DUTs which do not have a steady measuring current (e.g.
scanned measuring inputs) if measurement has already been
started during setting time. The calibrator cannot be used for
such objects.
pt1000 sele t
↵
ESC
NUM ON
0123.2
Pt1000
2l
°C / °F
(... 4x)
°C
6.2 Temperature Simulation of Thermocouples – Position °C
Thermocouples are simulated by means of voltage. Internal
or external temperature compensation is possible.
➭ Selecting sensor type:
Press the ESC key until you proceed to the sensor selection sub-menu.
Select either type B, E, J, K, L, N, R, S, T or U with the
#" keys for the simulation of a thermocouple. Press the
↵ key to return to the temperature simulation value main
menu.
➭ Internal or external reference temperature:
Press the ↵ key until Extern appears.
Selection is made with the #" keys.
intern: Press the ↵ key to return to the temperature si-
mulation value main menu. The measured internal refernece temperature is indicated with an ’I’ for internal on
the right-hand side at the bottom of the auxiliary display.
extern: Press the ↵ key to proceed to the temperature
value sub-menu.
➭ Setting the external temperature value:
The last entry position on the right-hand side blinks.
Enter the digits with the #" keys. Press the ESC key to
move the entry cursor one digit to the left. Alternatively,
you can press the #" keys at any entry position until the
higher ranking digits are changed as well.
By pressing the ↵ key to acknowledge the entry cursor at
the last entry position on the right-hand side, you store
the new value and return to the temperature simulation
value main menu. The external reference temperature is
indicated with an ’E’ for external on the right-hand side at
the bottom of the auxiliary display.
Function Description and Applications
10 different types of thermocouples can be selected, and can
be simulated within the temperature ranges specified
by IEC/DIN.
Selection can be made between an internally measured reference junction temperature, or numeric entry of an external
reference junction temperature within a range of –30 to
+40 °C.
Important Notes Regarding the Reference Temperature
The internal reference temperature is measured continuously
with the help of an integrated temperature sensor.
The reference temperature is generally measured at the thermocouple connector jack for devices under test with a thermocouple measuring input.
The two measurements may yield different results, and differences are registered as errors during thermocouple simulation. The following methods help to reduce this error:
a) The device under test is connected to the jacks at the
calibrator with equalizing leads for the thermocouple to
be simulated.
b) The temperature of the thermocouple connector jack at
the device under test is measured with a precision temperature measuring instrument, and the resulting value is
.
TC
8 GOSSEN METRAWATT GMBH
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