Gossen Metrawatt METRAHIT CAL User guide
Operating Instructions
METRAHIT⏐CAL
Calibrator
3-349-442-03
11/12.15
Operating Overview – Connections, Keys, Rotary Switch, Symbols
1
3
4
14
5
6
12
10
2
12
9
13
7
Not a measurement input!
Do not apply interference voltage,
except with current sink.
!
8
1 Display (LCD) (see page 3 for significance of symbols
2 HOLD / CONT Pause/resume ramp/interval
Increase parameter values
Mode menu:
3
ON / OFF | LIGHT
Selection of individual menu entries against direction of flow
, key for switching device and display illumination on and off
4 OUT | ENTER
OUT: Switch calibrator output on and off
Mode menu: Acknowledge entry (ENTER)
Move cursor to the right
5
SELECT RANGE operating mode: ramp function selection
6 Rotary switch for calibration functions and complete shutdown
7 DAkkS calibration mark
8 Connector jacks for calibrator output
9 HOLD / CONT Pause/resume ramp/interval
Reduce parameter values
Mode menu:
Selection of individual menu entries in direction of flow
10 MEAS/ CAL | SETUP
Key for switching back and forth between calibration and menu function
11 ZERO/ SEL | ESC
Mode menu: Exit current menu level and
return to a higher level,
exit parameters configuration
without saving data.
Pause ramp/interval.
Move cursor to the left,
12
SELECT RANGE operating mode: interval function selection
13 Power pack connector jack (accessory: NA X-TRA)
14 Infrared interface (accessory interface adapter:
USB X-TRA)
2 GMC-I Messtechnik GmbH
1 28
9
10
12
12
14
654 7
15
3
Battery full
Battery OK
Battery weak
Battery (almost) dead, U < 1.8 V
Data transmission ↓ to / ↑ from calibrator is active
IR interface in standby mode
(ready to receive starting commands)
Battery Level Indicator
Interface Indicator (with selector switch setting ≠ OFF)
Symbols used in the Digital Display 1 Battery level indicator
2 NUM: Numeric entry of the output signal
3 INT: Interval sequence active
4 RAMP: Ramp function active
5 SINK: Current sink is active
6 SOURCE: Current source is active
7 ON: The calibrator output is active
8 IR: Infrared interface display
9 Auxiliary display with decimal point and polarity display
10 Main display with decimal point and polarity display
11 Calibration unit of measure
12 : Simulator in continuous mode operation
13 Ni/Pt1000: Selected temperature sensor
14 Auxiliary display with decimal point and polarity display
GMC-I Messtechnik GmbH 3
Table of Contents
Page Page
1 Safety Features and Precautions ....................................................5
2 Initial Start-Up .................................................................................7
3 Voltage Source [V] ...........................................................................8
4
Frequency Generator (positive square-wave pulses) [Hz] ....................9
5 Resistance Simulation [Ω] ............................................................10
6 Temperature Simulation [°C / °F] ..................................................11
6.1 Temperature Simulation for Resistance Temperature Detectors – RTD setting for
temperature .................................................................................................12
Temperature Simulation for Thermocouples – TC Temperature Setting ...................12
6.2
7 Current Source and Current Sink [mA] ..........................................14
7.1 Current Sink – Simulation of a 2-Wire Transmitter ......................................... 15
7.2 Current Source ............................................................................................15
8 Interval Functions, Ramp Functions and Procedures ....................16
8.1 Interval Sequences – INT Function .................................................................16
8.2 Read-Out a Periodic Ramp – RAMP Function ..................................................19
9 Device and Calibration Parameters ...............................................21
9.1 Querying Parameters – InFo Menu ................................................................. 22
9.2 Entering Parameters – SETUP Menu ..............................................................22
9.3 Default Settings ............................................................................................23
10 Interface Operation (with selector switch setting ≠ OFF) ..............24
10.1 Activating the Interface ..................................................................................24
10.2 Configuring Interface Parameters ................................................................... 24
11 Technical Data ..............................................................................25
12 Maintenance .................................................................................29
12.1 Displays – Error Messages ........................................................................... 29
12.2 Batteries ...................................................................................................... 29
12.3 Fuses .......................................................................................................... 30
12.4 Housing Maintenance ................................................................................... 31
12.5 Return and Environmentally Sound Disposal ................................................... 31
13 Calibrator Messages .....................................................................31
14 Accessories ...................................................................................32
14.1 General ........................................................................................................ 32
14.2 Power Pack NA X-TRA (not included) ............................................................. 32
14.3 Technical Data for Measurement Cables
(scope of delivery: KS17 safety cable set) ....................................................... 32
14.4 USB X-
14.5 METRAwin90 Software .................................................................................33
TRA Bidirectional Interface Adapter ...................................................... 33
15 Repair and Replacement Parts Service
Calibration Center and Rental Instrument Service ........................34
16 Guarantee ......................................................................................35
17 Product Support ............................................................................35
18 Recalibration .................................................................................35
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1 Safety Features and Precautions
Attention!
!
Attention!
!
Note!
Warning!
You have selected an instrument which provides you with a high
level of safety. This instrument fulfills the requirements of applicable European and national EC directives. This is confirmed by
means of the CE mark. A corresponding declaration of conformity
can be requested from GMC-I Messtechnik GmbH.
The device has been manufactured and tested in accordance
with safety regulations IEC 61010–1:2010/DIN EN 61010–
1:2010/VDE 0411–1:2011. When used for its intended purpose,
safety of the operator, as well as that of the instrument, is
assured. Their safety is however 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.
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.
• Make certain that the measurement cables are in flawless condition,
e.g. no damage to insulation, no interruptions in cables or plugs etc.
• For this reason, it is imperative that a calibrator is never
confused with a multimeter.
• If 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
mum
allowable voltage and current values indicated at the jacks.
maxi-
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 circuits are equipped with an fuse, which makes this
circuit highly resistive in the event that excessive current
should occur in case of a fault for the duration of overloading.
If the calibrator is connected with reversed polarity, a high
current may occur which trips the integrated fuse.
The calibrator has been designed for safe connection to
signal circuits.
Maximum voltage to be applied between the connector jacks (8)
is 27 V. If U
fuse is blown.
max
or I
is exceeded, the integrated 250 V
max
Please observe the following prior to connecting the DUT:
Switch on the instrument and adjust the correct calibrator
function before connecting the DUT. Otherwise, a high current may flow through the DUT for a short while after
power-on, thus interfering with the fuse test.
• Be prepared for the occurrence of unexpected voltages at
devices under test (e.g. defective devices). For example,
capacitors may be dangerously charged.
• Device functions may not be started in electrical circuits with
The instrument may not be operated in explosive atmospheres, or connected to intrinsically safe electrical circuits.
corona discharge (high-voltage).
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Meanings of Symbols on the Instrument
!
Serial number
Registration number
Date of calibraion (year – month)
German Accrediation Body GmbH – Calibration lab
XY123
2012-08
D-K-
15080-01-01
Warning concerning a source of danger
(attention: observe documentation!)
Ground
Continuous, doubled or reinforced
insulation
Indicates EC conformity
The device may not be disposed of with the trash.
Further information regarding the WEEE mark can be
accessed on the Internet at
www.gossenmetrawatt.com by entering the search
term WEEE.
DAkkS calibration mark (blue seal):
Opening of Equipment / Repair
The equipment may be opened only by authorized service personnel to ensure the safe and correct operation of the equipment
and to keep the warranty valid.
Even original spare parts may be installed only by authorized service personnel.
In case the equipment was opened by unauthorized personnel,
no warranty regarding personal safety, measurement accuracy,
conformity with applicable safety measures or any consequential
damage is granted by the manufacturer.
Repair, Parts Replacement and Balancing
When the instrument is opened, voltage conducting parts may be
exposed. The instrument must be disconnected from the electrical circuit before the performance of repairs, the replacement of
parts or balancing. If balancing, maintenance or repair of a live
open instrument is required, work 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
6 GMC-I Messtechnik GmbH
2 Initial Start-Up
Attention!
!
Note!
Battery operation
Be certain to refer to section 12.2 regarding correct battery
installation.
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 if a load is connected to the output.
If this is the case, replace the batteries in accordance
with section 12.2, or continue work with the power pack if
possible.
Operation with the Power Pack (accessory, not included)
Installed batteries are disconnected electronically if the NA X-TRA
power pack is used, and need not be removed from the
instrument (see also section 12.2). If rechargeable batteries are
used, they must be recharged externally.
Switching the Instrument On Manually
➭ Move the rotary switch from OFF to any calibration function.
or
➭ Press the ON / OFF | LIGHT key if the rotary switch is not in the
OFF position.
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.
After the key is released, the device is ready to execute
calibration.
Switching the Instrument On with a PC
After transmission of a data frame from the PC, the simulator is
switched on. See also section 10.1.
Electrical discharge and high frequency interference may
cause incorrect displays to appear, and may disable the
simulator. 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 section 9.2 on page 22.
Switching the Instrument Off Manually
➭ Press and hold the ON / OFF | LIGHT key until OFF appears at the
display. Shutdown is acknowledged with two, brief
acoustic signals.
➭ Complete shutdown of all functions including the IR interface
is accomplished by turning the rotary switch to OFF.
Automatic Shutdown of the Calibrator
The device is switched off automatically after the selected time
with the AP oFF function (see section 9.2), has elapsed.
Shutdown is acknowledged with a brief acoustic signal.
Automatic shutdown is disabled in the continuous operating
mode (AP oFF = on).
Disabling Automatic Shutdown
The instrument can be set to continuous operation.
➭ Select AP oFF = on in the Setup menu (see section 9.2).
Continuous operation is indicated at the display with the
symbol.
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3 Voltage Source [V]
Output
CALIBRATOR
+
–
–
+
Input
Device to be calibrated, e.g.
measuring transducer
≥1kΩ
V
ON/OFF
LIGHT
ZERO/ SEL
ESC
OUT
ENTER
Voltages can be simulated within the following ranges:
0 … ±60 mV, 0 … ±300 mV, 0 … 3 V, 0 … 10 V and 0 … 15 V.
Resistance of the connected circuit should not be any less
than 1 kΩ.
Selecting a Voltage Range for the Fixed Value Function
➭ Press the ZERO/ SEL | ESC key in order to switch to the
[select range] menu.
➭ Select the desired voltage range with the keys.
Acknowledge your selection with OUT | ENTER.
The display is switched to the voltage value entry window, but
the selected voltage range still appears in the auxiliary display.
Selecting the Voltage Range for the Interval or Ramp Function
➭ Press the ZERO/ SEL | ESC key in order to switch to the
[
select range] menu. Select the desired voltage range with the
keys.
➭ Switch to the interval or ramp function menu with the
keys (see section 8). Start the respective function by pressing
OUT | ENTER.
➭ Connect the device to be calibrated with the measurement
cable as shown.
Abbreviated Instructions
Select calibration function.
➭ Select the V calibration function with the rotary switch.
➭ Switch the calibrator on by pressing the ON / OFF | LIGHT
key.
The last selected voltage range is displayed.
➭ Set the voltage value:
ON indicates:
Select voltage range and acknowledge for fixed value function.
Voltage is applied directly to the output!
Select the digit to be changed with the keys, and change
the respectively selected digit with the keys.
➭ The output can be deactivated with the OUT | ENTER key
[
out.off], or activated once again.
Change the fixed value.
000.00 V
(Negative values within a range of ±60 mV or ±300 mV can be selected by
scrolling with the
select range: 15 V … 60 mV
key to below the zero point.)
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4 Frequency Generator (positive square-wave pulses) [Hz]
Note!
Attention!
!
ZERO/ SEL
ESC
ZERO/ SEL
ESC
OUT
ENTER
ZERO/ SEL
ESC
OUT
ENTER
Voltage and frequency can be set independent of each other for
frequency generators.
The output signal is a square wave. Resistance of the connected
circuit should not be any less than 1 kΩ.
➭ Connect the device to be calibrated with the measurement
cable in the same way as specified for the voltage simulator.
➭ Select the HZ calibration function with the rotary switch.
➭ Switch the calibrator on by pressing the ON / OFF | LIGHT
key.
➭ Set the voltage range (300 mV, 3 V, 10 V or 15 V):
Switch to the voltage range menu [
ZERO/SEL | ESC key twice. Select the desired voltage range
with the keys. Acknowledge your selection with
OUT | ENTER. The display is switched to the voltage
amplitude entry window.
➭ Set voltage amplitude (0 … 15 V):
Select the digit to be changed with the keys, and change
the respectively selected digit with the keys.
Acknowledge your selection with OUT | ENTER. The display is
switched to the frequency entry window, but the selected
voltage amplitude still appears in the auxiliary display.
➭ Set frequency (1 … 1000 Hz):
ON indicates: Voltage is applied directly to the output using the selected frequency!
Select the digit to be changed with the keys, and change
the respectively selected digit with the keys.
➭ The output can be deactivated with the OUT | ENTER key
[
out.off], or activated once again.
select range] by pressing the
The following error messages are possible:
“HiCurr” (high current – current at overload limit) where
I
=18mA, “0ut 0l” and 3 acoustic signals (out of
max.
limit – limit value exceeded) where I > 27 mA; the simulator
is switched off.
No interference voltage may be applied to the calibrator
jacks in this operating mode.
The calibrator is protected against brief application of a
large interference voltage with a replaceable fuse in the
event of operator error (see section 12.3).
Abbreviated Instructions
Set the voltage range (starting from frequency display).
select range: 15 V … 60 mV
Set voltage amplitude (starting from frequency display).
000.00 V
Set frequency.
0000.0 Hz
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5 Resistance Simulation [Ω]
Note!
Attention!
!
Output
CALIBRATOR
+
–
2-Wire Resistance Simulation
Device to be Calibrated
–
+
Input
Measuring Current: 50 μA to 5 mA
Ω
ON/OFF
LIGHT
The resistance simulator is capable of simulating resistors using
Abbreviated Instructions
Select the calibration function.
2-wire connection for the following range: 5 … 2000 Ω.
Change the fixed value.
0000.0 Ω
The following error messages are possible:
“HiCurr” (high current – current value to high) where
I>4.5mA and
➭ Connect the device to be calibrated with the measurement
cable as shown.
“LoCurr” (low current – current too low or reversed polarity)
where I < 40 μA (corresponds to unconnected sockets)
➭ Select the Ω calibration function with the rotary switch.
➭ Switch the calibrator on by pressing the ON / OFF | LIGHT
key.
➭ Set the resistance simulation value:
ON indicates: The output is active!
Select the digit to be changed with the keys, and change
the respectively selected digit with the keys.
➭ The output can be deactivated with the OUT | ENTER key
[
out.off], or activated once again.
Switching Between the Fixed Value, Interval and Ramp Functions
➭ Press the ZERO/ SEL | ESC key in order to switch to the
[select range] menu.
➭ Switch to the interval or ramp function menu with the
keys. Start the respective function with OUT | ENTER.
No interference voltage may be applied to the calibrator
jacks in this operating mode.
The calibrator is protected against brief application of a
large interference voltage with a replaceable fuse in the
event of operator error (see section 12.3).
Response time of the calibrator output to the specified resistance
value after measuring current is applied is max. 30 ms. Devices
under test with non-continuous measuring current (e.g. scanned
measuring inputs) result in erroneous measured values if
measurement is started before response time has elapsed. The
calibrator cannot be used for devices of this type.
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6 Temperature Simulation [°C / °F]
MEAS/ CAL
SETUP
OUT
ENTER
MEAS/ CAL
SETUP
OUT
ENTER
OUT
ENTER
OUT
ENTER
MEAS/ CAL
SETUP
MEAS/ CAL
SETUP
OUT
ENTER
OUT
ENTER
OUT
ENTER
OUT
ENTER
MEAS/ CAL
SETUP
MEAS/ CAL
SETUP
OUT
ENTER
OUT
ENTER
OUT
ENTER
OUT
ENTER
OUT
ENTER
MEAS/ CAL
SETUP
The temperature simulator is capable of simulating resistance
temperature detectors (RTD) or thermocouples (TC) with
specification of the external reference junction temperature.
➭ Connect the device to be calibrated with the measurement
cables.
➭ Select the Temp RTD or Temp TC calibration function with the
rotary switch.
➭ Switch the calibrator on by pressing the ON / OFF | LIGHT
key.
The last selected temperature sensor is displayed.
➭ Set the temperature value:
Simulated resistance or simulated voltage is applied directly to the
output!
Select the digit to be changed with the keys, and change
the respectively selected digit with the keys. As an
alternative, press and hold the keys with the cursor at
any entry position until the higher value digits are scrolled
through as well.
➭ The output can be deactivated with the OUT | ENTER key
[
out.off], or activated once again.
Query internal reference temperature – Info menu.
info
batt 2.9 V ... temp internal 23.7 °C
Parameter Entries for Thermocouple Temperature Simulation
Select unit of measure °C or °F – SEt menu.
info set
time ... temp internal
unit set °F °C
Select internal reference temperature – SEt menu.
info set
time ... temp external
unit set temp set external internal
temp internal 23.7 °C
Selecting Resistance Temperature Detector (RTD) or Thermocouple (TC)
for the Fixed Value, Interval or Ramp Function
➭ Switch to the fixed value, interval or ramp function menu by
pressing the ZERO/ SEL | ESC key.
➭ Select the [
select sensor] menu with the keys.
➭ Select the desired sensor with the keys. Acknowledge
your selection with OUT | ENTER. The display is switched to
the window for temperature value entry, but the selected
sensor still appears in the auxiliary display.
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Select and set external reference temperature – SEt menu.
info set
time ... temp internal
unit set temp set internal external
external set 21.0 °C
temp external 22.4 °C
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