7. Calibrating the F200
7.1 F200 Instrument calibration
The dc bridge measurement technique used in the F200 is inherently very stable and linear, better
than
&
4 m
$
over the full range at +20°C ±2°C (equivalent to
&
10 mK with a Pt100 PRT). However
drift of the internal reference resistor will occur with time making periodic re-calibration necessary.
7.1.1 Instrument Calibration Supervisor
To assist in maintain a valid calibration, at power on the instrument next calibration date is compared
with the instrument current date. If the next calibration date is found to have expired the instrument
will warn the operator.
Instrument out
Of Calibration
Press the ‘
No
’ soft key to continue if you do not
wish to calibrate the instrument.
Calibration Now?
Yes No
Press the ‘
Yes
’ soft key to enter the instrument
calibration menu, the password enter menu will
be displayed.
7.2 Equipment
Temperature controlled environment at +20°C ±2°C
Calibrated 400 ohm +/- 10 ohm reference resistor at +/- 1 ppm accuracy.
7.3 Calibration procedure
Place the instrument to be calibrated in a +20°C ±2°C temperature controlled environment for at least
60 minutes.
Select thermometer input channel 1 using the ‘
Ch
’ key.
Options
Cal
Com
Ver
Set the measurement units to resistance using the
‘
Units
’ key.
Select the Options menu using the ‘
Menu
’ key.
Press the ‘
Cal
’ soft key; the Calibration menu
will be displayed.
Calibration
Cal
Date
F200-14-001
Page 7-1
ASL 2003
Содержание F200
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Страница 35: ...Smart Probes This page is intentionally left blank Page 5 2 F200 14 001 ASL 2003 ...
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