Hardware manual

LT-4201TM/4301TM Hardware Manual
133
Temperature Input (Thermocouple) Characteristics
The table describes the characteristics of the Temperature Input (Thermocouple):
WARNING
UNINTENDED EQUIPMENT OPERATION
Do not exceed any of the rated
values specified in the following tables.
Failure to follow these instructions can result in death, serious injury, or
equ
ipment damage.
Input Characteristics
Input sensor type Thermocouple
Input type range
(1)
J (-200...760°C) (-328...1400°F)
K (-240...1370°C) (-
400...2498°F)
R (0...1600°C) (32...2912°F)
B
(200...1800°C) (392...3272°F)
S (0°C...1600°
C)
(32...2912°F)
T (-200...400°C) (-328...752°F)
E
(-200...900°C) (-
328...1652°F)
N (-200...1300°C) (-328...2372°F)
Input impedan
ce Typically 10 MΩ
Sample duration time 10 ms+1 cycle time
Conversion mode Sigma delta type
Digital resolution 16 bits
Input filter Low pass
Resolution temperature value 0.1°C (0.18
° F) (Type J)
Detection type Open circuit (detection on each channel)
Input tolerance Maximum deviation at
25°C (77°F)
without
electromagnetic
disturbance
0.2 % of the full scale, plus standard point of
compe
nsation precision at +/- 6°C.
Maximum deviation 0.28 % of full scale range
Temperature drift 30 ppm/°C
Input tolerance - terminal temperature
compensatio
n
± 5°C (
41°F) after 10 min.
Cold junction compensation in the
temperature range (0...50°C
(122°F))
Internal cold junction error: +/- 6°C (42.8°F)
after operating 45 minutes.
Rejection in
differen
tial mode
50/60 Hz Ty
pically 60 dB
Common mode
reject
ion
Typically 80 dB
Isolation Method Photocoupler Isolation
Permitted input signal ± 5 Vdc max.
Warm up time 45 minutes
Terminal blocks Type: 3.5 mm (0.137 in.) pitch
Terminal blocks are removable
Noise resistance - cable Shielded cable is necessary
(1) Temperature measurement on PCB at terminal block for cold junction compensation.