Tektronix 475A - Temperature; Accuracy Check

TEMPERATURE NOTE
Temperature accuracy is affected by several factors
such as the angle of contact between the probe and
the device to be measured, a thermal gradient, heat
eu
removed
from
the
device
by
the
probe,
ete.
CAUT
|
CAUTION
$
These
items
and
other
probe
information
are
in
the
probe manual, which should be reviewed.
The maximum safe voltage on the measurement
surface is £400 V (dc + peak ac} above chassis
ground.
Accuracv Check
The sensor tip is fragile and may break if dropped or
subjected to excessive stress. Force exerted on the
sensor tip should not exceed 20 pounds. The DM44 is calibrated to its original probe,:
accurate readings within 2°C for examples tha
If
the
reading
exceeds
—55°C
or
+150°C,
remove
The
DM44
should
be
recalibrated
to
any
repl
fhe probe at once to prevent probe damage. probe. ”
In the following checks, use an accurate thermom
to verify water temperature. Anything in solution affe
the melting temperature and the boiling point is affected
1.
Push
in
the
TEMP
(°C)
FUNCTION
button.
See
by
changes
in
altitude
and
barometric
pressure.
Fig.
10.
2. Apply the temperature probe to the device to be
measured so the flat surface of the probe tip mates against
the device to be measured and observe the reading. See
Table
4
to
convert
the
reading
from
centigrate
to
Allow
a
container
(preferably
insulated}
of
crushed
ice
_
fahrenheit.
to
melt
until
there
are
only
a
few
pieces
of
ice
remaining.
ma
Low Temperature
24 475A/DM44 Operators @