Datasheet
METRAHITCAL
Calibrator
2 GMC-I Messtechnik GmbH
Read-Out Modes for Source and Sink Functions
Calibration signals can be read out either manually (numerically
with key entries), or automatically by means of intervals with
intermediate steps, or as a ramp in a stepless fashion.
The METRAHIT CAL can thus be used as a precision pulse
generator for dynamic testing.
Depending upon individual needs, desired dynamic response can
be derived from, for example, the full-scale value and the number
of intermediate steps (intervals), or rise and dwell periods (ramp).
This is especially helpful for long-term testing of laboratory and
panel recorders, as well as measuring transducers, and for
“one-man” control rooms.
Fixed value
Calibration values are set and read out manually with the help of
the instrument’s keypad immediately after the calibration function
has been selected.
Interval
Continuous read-out of calibration values is accomplished in
steps between the minimum and maximum values selected at the
device to be calibrated in this read-out mode. The following step
can be triggered automatically (time per step: 1 second to 60
minutes) or manually.
Ramp
Continuous read-out of calibration values is accomplished in a
stepless fashion between the minimum and maximum values
selected at the device to be calibrated in this read-out mode.
Ramp duration for rising and falling ramps, as well as dwell time at
min. and max. values, can be set within a range of 1 second to 60
minutes.
Temperature Simulation
The ten most common sensor types are available for the
simulation of thermo-voltages. Thermo-voltages can be read out
with reference to an internal (terminal temperature) or an external
reference junction.
Temperature for the external reference junction can be set at the
calibrator or with a PC. This eliminates the need to connect the
device to be calibrated with the calibrator via the respectively
required compensating lead. A copper conductor between the
calibrator and the device to be calibrated is sufficient in this case.
Applicable Regulations and Standards
Technical Data
Simulator for Temperature Sensors (resolution: 0.1 K)
* Without internal reference junction;
Relative to fixed external reference temperature and thermovoltage of the thermocouple
Internal reference junction: 2 K intrinsic error, external reference junction: entry of -30
60
C
Key
S = setting value
Reference Conditions
Ambient temperature
+23 C 2K
Relative humidity 40 75%
Battery voltage 3.0 V 0.1 V
IEC 61010-1/EN 61010-1/
VDE 0411-1
Safety requirements for electrical equipment for
measurement, control and laboratory use
EN 60529
VDE 0470, part 1
Test instruments and test procedures
Degrees of protection provided by enclosures (IP code)
DIN EN 61326-1
VDE 0843-20-1
Electrical equipment for measurement, control and labo-
ratory use – EMC requirements – Part 1: General re-
quirements
Calibration
Function
Simulation
Range
Resolution
30,000 digits
(4¾ places)
Max. nominal
Load
Intrinsic
Uncertainty
Overload
Direct voltage source (% S + mV) I
max
V
0300 mV 0.01 mV
15 mA
0.05 + 0.02
18 mA
0 3 V 0.1 mV 0.05 + 0.2
0 10 V 1 mV 0.05 + 2
0 15 V 1 mV 0.05 + 2
Frequency generator
duty cycle (pulse-no-pulse ratio): 50%,
Amplitude: 10 mV 15 V
(% S + Hz) I
max
Hz
1 Hz
1 kHz
0.1 1 Hz 15 mA 0.05 + 0.2
18 mA
Current source Max. load (% S + A)
mA
4 20 mA
1 A 20 V 0.05 + 20 20 mA
0 24 mA
Current Sink (% S + A) U
max
mA
4 20 mA
1 AV
in
= 4 ... 27 V 0.05 + 2 27 V0 20 mA
0 24 mA
Resistance simulation
Sensor current [mA]
(% S + )I
max
52000 0.1 0.05...0.1..4...5 0.05 + 0.2
5 mA
Sensor Type Simulation
Range in C
Simulation
Range in F
Intrinsic
Uncertainty
Over-
load
C / F
Resistance thermometers per IEC 751 (% S + K) I
max
Pt100 –200 +850 –328+1562 0.1 + 0.5
5 mA
Pt1000 –200 +300 –328 +572 0.1 + 0.2
Resistance thermometers per DIN 43760 (% S + K) I
max
Ni100 –60 +180 –76 +356 0.1 + 0.5
5 mA
Ni1000 –60 +180 –76 +356 0.1 + 0.2
RTD sensor current: 0.05 ... 0.1 ... 4
... 5 mA
*
Thermocouples per DIN and IEC 584-1
U in mV * I
max
K (NiCr/Ni) –250+1372 –418+2501
( 0,05%
v.|Setting|
+
0,02 mV )
18 mA
J (Fe/CuNi) –210+1200 –346+2192
T (Cu/CuNi) –270+400 –454+ 752
B (Pt30Rh/Pt6Rh)
+500+1820 +932+3308
E (NiCr/CuNi) –270+1000 –454+1832
R (Pt13Rh/Pt) –50+1768 –58+3214
N (CU/Cu10) –270+1300 –454+2372
S (Pt10Rh/Pt) –50+1768 –58+3214
L (Fe/CuNi) –200+900 –328+1652
U (Cu/CuNi) –200+600 –328+1112