15
System adjustment (only possible in testo 645):
testo 645 and probes with EEPROM (Part no. 0614.xxxx) can
be adjusted to the “zero error adjustment point”. The probe
characteristic saved in the measuring instrument is offset at a
measurement point. This is simply entered in the instrument at
the touch of a button. The following serves as a reference for
offset calculations:
- A Testo calibration certificate or
- A highly accurate Pt100 probe:
An accurate Pt100 probe measures the temperature at
socket 2; an inaccurate but quick probe measures in the
same substance; the offset correction must be such that both
probes show the same value.
Example: The reference probe in socket 2 measures 70.0 °C in
the vat.
The probe in socket 1 measures 69.6 °C.
Correct by 0.4 °C!
The respective flashing position can be changed using the
buttons or confirmed by pressing
.
Note:
Offset is saved in probes with EEPROM and is automatically
recognised when the instrument is switched on.
In probes without EEPROM, the set offset is located in the
input socket.
The OFFSET value is displayed or printed when switching
on, saving or printing.
Deleting system adjustment: The set OFFSET is reset to 00.0.
System adjustment
Current measurement
4. Parameter settings
CAL Re
RESET CAL
1:
69.6
70.0
1:
2:
M.05
MAN
N.0017
°C
°C
70.0
00.4
1:CAL
OFFSET
M.05
MAN
N.0017
°C
Current measurement
i
The setting functions are activated in accordance with the rea-
ding selected - flashing cursor in display.
1.888.610.7664 info@Testo-Direct.com
www.Testo-Direct.com
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