Measurement-computing DBK52 Manuel d'utilisateur télécharger pdf (Page 2)

True differential measurements of T/Cs require bias-current referenced to the analog common. Resistors

from each input T/C are connected to the analog common. Filter capacitors across each input operate with

input protection resistors to form a single-pole RC low-pass filter.

Hardware Setup

Module Connection

The DBK52 has miniature T/C jacks to connect different types of thermocouples and an analog-ground

access point. Connections are provided for 14 thermocouples. Thermocouple polarities must be

observed. Thermocouple types J, K, T, E, N28, N14, S, R and B are supported by the LogView or

DaqView software and may be connected to DBK52 board channels CH2 through CH15.

T/C

Type

(+) Lead to

Channel-Hi

(-) Lead to

Channel-Lo

J White Red

K Yellow Red

T Blue Red

E Violet Red

N28 Orange Red

N14 Orange Red

S Black Red

R Black Red

B Gray Red

Note: CH0 is reserved for the cold-junction compensation sensor (factory installed).

CH1 is permanently shorted to allow software-driven auto-zero to compensate for

temperature drift.

Thermocouple wire is standardized and color-coded as shown in the table. T/Cs have a very small output.

Long T/C leads can pickup lots of noise. Use shielding as needed, and average several readings in

software to minimize noise effects.

After all connections are in place, secure wires to captive areas (pre-drilled holes) at the rear edge of the

board. Nylon tie wraps (not included) work well for this purpose.

DBK52, pg. 2 989594 DBK Option Cards and Modules

1 2 3 4

Pas de commentaire

Measurement-computing DBK52 Manuel d'utilisateur Page 2