Chroma 16502 - Description for Setting Menu

Descriptions of Temperature Measurement and Correction Function
8-3
(rt): Measured resistance value
(t): Ambient temperature as measuring
(T): Resistance value is temperature constant of zero (copper: 235; aluminum: 230)
Ex.:
The initial temperature(t0) of a copper wire is 20°C as well as initial resistance value(r0) of
that is 200mΩ. We assumed that ambient temperature (t) is 25°C and then the measured
resistance is 210mΩ. At this time, the copper wire temperature variation (Δtn) can be obtained
as following formula.
Δtn = rt / r0 *(T+ t0)-(T+t) *T is temperature constant. (Copper: 235;
Aluminum: 230)
= (210 e-3 ) / (200 e-3) *(235 + 20) - (235 + 25) = 7.75 °C
That is to say, the temperature variation of copper wire is increment of 7.75°C. The
temperature is ambient plus varied temperature i.e. 25°C + 7.75°C= 32.75°C.
8.2.2 Description for Setting Menu
Temperature measurement function needs to set the following three conditions.
1. INIT RESISTANCE: Initial resistance value (r0) setting.
2. INIT TEMP : Initial temperature (t0) setting.
3. CONSTANT : Resistance value is temperature constant of zero. (Copper: 235;
Aluminum: 230)
Setting procedure:
(1) Press [MAIN INDEX] after 16502 powered-on, thus the following screen will be shown.
<
M
A I N I N D E X >
C O
M
P A R E
B I N N I N G
T E
M
P . C O N V .
R S C A N
F2
F3
← Temp. conversion setting
F4
F1
(2) Next, press TEMP.CONV. [F3] in Main Index, the screen is shown as below.
<
M
A I N I N D E X
：
T E
M
P . C O N V . >
S E T T I N G
M
E A S U R E
←>The>various>conditions>setting
>>>of>temp.>conversion.
F2
F3
F4
←>The>measurement>for>temp.
>>>conversion.
F1
(3) Press Setting [F1] to enter to condition setting screen as below.
Setting screen: