HP 3468A - Measurements

TEMPERATURE MEASUREMENTS
The
TEMP
program
computes
the
temperature,
in
°C,
corresponding
to
the
resistance
of a thermistor.
The program has been designed to work with ther-
mistors
exhibiting
a
5.0000
Kohm
resistance
at
25°C
such
as
a
type
44007
(-hp-
part number 0837-0164)
or equivalent.
The program was written for 2-wire resistance measurements which provides ac-
curate
results
if
the
thermistor
is
used
at
a
temperature
where
its
resistance
is
much
greater
than
the
resistance
of
the
test
leads.
For
greatest
accuracy
from
a
thermistor, 4-wire resistance should be made. To change from the 2-wire mode to
4-wire mode, change line 15 to read XEQ ”M40HM”. This program is useful over
a range of —80°C to + 150°C.
23 G70 35
BIOLBL “TEMP Label Temperature measurements = er a ae caallidienee> ce:
82
-6.
768961227
Spel
Af
temperatures
36°
and
above
83 STO @1 Conversion coefficients for 2? GTO 36
2 aoe resistances above 3134 2ReLBL 35
ohms (36°C) &
86
322.
887684
29
RCL
G3
(Get
coefficients
tor
@7 STO 83 38 REL 82 temperatures below 36°
88 ~5.952179428 31 RCL 81
49
STO
11
S2eLBL
36
18
4751.384293
/
Conversion
coefficients
for
33
RCL
08
11 $70 12 resistances equal to or less 34 LH
12 383, 33192 than 3134 ohms (36°C) 35 ROY
13
$10
13
St
Resistance
to
temperature
14 XEQ *INI68™ Execute Initialization program = conversion
: OY
Se en Sec eae oe
48 STO 8b
16*LBL “MEAS” 41 FIN 2
1? 3134 42 D2"
18 ENTERT 43 RCL 08
19 TRIGGER Tests for resistance above
3134 ohms (36°C) 44 ARCL ¥ Display temperature
28
IND
45
t
DEG
Cc
21
STO
a8
46
OUTA
BEN?
4?
GTO
“MEAS
48 J END.
52