Rugged,
Reliable EMC Design
The calibrator is shielded from ambient
influences and is protected from rough handling (jolts and impacts)
with a sealed, impact resistant housing and a protective rubber case
which is provided as standard equipment. Additional protection is
provided by the optional ever-ready case.
The internal ferromagnetic shield and electronic attenuators protect
against interference caused by electrical and magnetic leakage
fields, as well as electrostatic discharge.
Automatic
Blocking System (ABS)
Our proven mechanical blocking system
prevents incorrect connection of measurement cables after the
desired sensor function has been selected at the rotary switch.
Data Storage
Calibration sequences and programs can be stored and saved to
the integrated memory with the keypad and can be queried either
forward or in reverse. The calibrator can be linked to a PC with the
optional METRAHitBD232 plug-in interface adapter.
Individual values, intervals and ramps which have been created and
stored to a data file with the help of METRAwin90 software can be
uploaded to the calibrator and saved to non-volatile memory.
Easy Operation
All calibration and simulation functions are controlled by means
of the central rotary switch and four keys. Stored values and
sequences can be selected, one after the other, with the and Ż
keys.
Frequency and Pulse
Run Generator
The METRAHit 18C is capable of generating continuous
frequency signals for the testing of SPCs, energy meters, flowmeters
etc. Generated square-wave pulses have adjustable amplitude and can
be used to simulate sensor pulses.
A predetermined pulse run can
also generated for a given frequency.
Ramp and Step
Functions
The METRAHit 18C can be used as a precision generator
for dynamic testing.
For example, upper and lower scale limits and
the number of intermediate steps, or rise and dwell periods, can be
used to establish desired test dynamics depending upon
requirements.
This is especially helpful for long-term cycle testing
of laboratory or panel recorders, as well as for one man operation
for calibration tasks.
Battery and
Mains Mode Operation
The METRAHit 18C can be powered
with either standard or rechargeable batteries .
The integrated battery tester assures uninterrupted operation of the
calibrator.
The mains power pack, which is available as an
accessory, is suited for stationary operation for long-term testing
or in the laboratory.
The easy to replace, environmentally sound
NiMH batteries can be charged with a separate battery charger.
Modular
Expansion to Calibration System
The METRAHit 18C not only serves
as a calibration standard. As a professional calibration tool, it
can be readily linked to a PC at any time as well, from which
frequently used calibration data and sequences can be uploaded.
Measuring point specific data can be loaded for on-site calibration
tasks, and device specific data for laboratory applications.
The calibration of measuring transducers or transmitters for process
engineering applications can be easily automated through the
additional implementation of the METRAHit18S multimeter and
METRAwin90 software, which allows for a complete comparison
of set-points and actual values, as well as the creation of a test
record with a PC and a printer.
The METRAHitBD232 interface adapter, the METRAHitSI232
memory adapter and METRAwin90 software are available as
accessories for connection to a PC.
Test
Certificate
A retraceable calibration certificate is
included with every METRAHit 18C calibrator at no additional
cost.
Automatic
Reference Junction
Thermoelectric voltages can be simulated
for the ten most common types of sensors.
Thermoelectric voltage can be read out with reference to an internal
(0 °C) or an external reference junction.
The temperature for the
external reference junction can be adjusted manually at the
calibrator or the PC.
In this way, the device to be calibrated does not have to be
connected to the calibrator with a compensation cable: a copper
conductor is sufficient.
Output Types
for Source and Sink Functions
The read-out of calibration signals can be
accomplished either manually (numeric via keys), or automatically by
means of intervals (steps) with intermediate steps, or in a stepless
fashion by means of a ramp.
The METRAHit 18C can thus be
used as a precision generator
for dynamic testing.
For example, upper and lower scale limits and
the number of intermediate steps (intervals) or rise and dwell
periods (ramps) can be used to establish desired test dynamics
depending upon requirements. This is especially helpful for
long-term cycle testing of laboratory or panel recorders and
measuring transducers, as well as for one man operation for
calibration tasks.
Numeric Output
Calibration values are read out and
adjusted manually via the keypad at the instrument directly after
selection of the calibration function.
Interval Output
Continuous read-out of calibration values
occurs in steps between the selected minimum and maximum values of
the device to be calibrated.
The sequence step can be executed
automatically (time per step: 1 s to 60 min) or manually.
