Measurement Computing DBK Part 2 - Manual (Page 191)

DBK Option Cards and Module 907994 DBK100 Series pg. 3
The benefit of a DBK100 system is that for every 56 TC input channels, only a single cable is required
back to the measurement equipment. Thus the length of the TC wire can be much shorter, and the number
of long cables back to the equipment is reduced by a factor of 56. Besides reducing the length of TC wire,
this system substantially reduces the opening required between the engine compartment and the primary
acquisition equipment, which is typically located in the passenger compartment of the test vehicle.
All linearization and cold-junction compensation is automatically corrected in the system, resulting in
stable and accurate temperature measurements with typical accuracy of better than 2°C. Two versions of
the DBK100 are available, differing by the way in which thermocouples are attached to the unit. With both
models, the included software driver automatically determines the temperature based on the user’s input as
to what TC type is attached to each channel.
Each DBK100/D and DBK100/T includes a built-in cold junction compensation thermistor (CJC) for direct
measurement of type J, K, T, E, N28, N14, S, R, and B thermocouples. The following table provides the
temperature range for each type.
Thermocouple Temperature Ranges
T/C Type J K T E N28 N14 S R B
Temperature
Range °C -200 to
760
-200 to
1200
-200 to
400
-270 to
650
-270 to
400
0 to
1300
-50 to
1768
-50 to
1768
50 to
1780
Temperature
Range °F -328 to
1400
-328 to
2192
-328 to
752
-454 to
1202
-454 to
752
32 to
2372
-58 to
3214
-58 to
3214
122 to
3236
Cable Note:
There are three different sizes of CA-257-x interconnect cable. Any can be used to connect DBK100 units to
each other, or to a DBK101. The cable lengths, in inches, are indicated by the last two digits of the part
number. Thus:
o
CA-257-18 (18 inches)
o
CA-257-36 (36 inches)
o
CA-257-72 (72 inches)