Operation Manual

38 GMC-I Messtechnik GmbH
V/Hz, Ω, Temperature, and A/Hz Measurements
5.5.2 Measurement with Resistance Thermometers
(METRA
HIT ⏐ X- TRA ⏐ O UTDOOR only)
Ð Set the rotary switch to “Temp
TC
” or “Temp
RTD
”.
The last selected temperature measurement or sensor, i.e. type K
or Pt100/Pt1000, remains in memory and is accordingly
displayed. Press the FUNC | ENTER key in order to change to the
other measuring function if required. The sensor type, i.e. Pt100
or Pt1000, is detected automatically and displayed.
There are two different ways to compensate for cable resistance:
Automatic Compensation
Ð Press the ZERO | ESC key.
“Short leads” appears at the display.
If you prefer to enter cable resistance directly, you can skip the
following entry prompt.
Ð Short circuit the measuring instrument’s connector cables.
“000.00 ” appears at the display. After pressing the FUNC |
ENTER key, automatic compensation of cable resistance is
activated for all subsequent measurements. The short-circuit
can now be eliminated, and the device is ready for use.
Entering Cable Resistance
Ð Press the ZERO | ESC key once again in the automatic
compensation menu.
Ð Enter the known resistance of the connector cables with the
scroll keys: Select the digit to be changes with the   keys,
and change the respectively selected digit with the
 keys.
The default value is 0.43 Ω. Values can be selected within a
range of 0 to 50 Ω.
Ð Upon pressing the FUNC | ENTER key, the selected value is activated and
the display is returned to the measuring function. Cable resistance re-
mains in memory even after the instrument has been switched off.
COM
V
Temp
Ω
Temp
TC
0023.3
°C
Temp
RTD
Type K
0025.6
°C
Pt1000
TC
RTD
000.00
Ω
Short Leads
R L
Enter Cable Resistance
Automatic
RTD
Compensation
Measuring Ranges
RTD Pt100 – 200.0 … +850.0 °C
RTD Pt1000 –150.0 … +850.0 °C
FUNC
ENTER
FUNC
ENTER
ZERO
ESC
ZERO
ESC
FUNC
ENTER
000.50
Ω
R L