
4-14 Input and Output Card
UM4.6:CS6003 Original — December 1991
Step 13: Repeat steps 7 through 12 for input channels two through
four.
Step 14: Disconnect the decade resistor.
Step 15: Set the calibrator ON/OFF switch to OFF.
Step 16: Remove the RTD input card.
4.1.4 Types DM6341 Millivolt and DM6351, DM6352, DM6353,
DM6354, and DM6355 Thermocouple Input Cards
The Type DM6341 Millivolt Input Card and the DM6350-Series
Thermocouple Input Cards use a similar isolated low-level analog input
card. The basic calibration steps are the same for all of these cards.
Note
Because of the extremely small, accurate
voltages required for isolated low-level analog
input card calibration, perform the procedure only
in a highly controlled environment. Minimize the
effect of, or eliminate, all external power supplies,
motors, fluorescent lights, and other sources of
electromagnetic interference.
4.1.4.1 Overview
Calibration of isolated low-level analog input cards consists of setting a
minimum and maximum voltage input level for each of the four input
channels and checking circuit linearity. The ZERO potentiometer controls
the minimum level. The 0 percent level is calibrated slightly above a true
zero voltage to allow for underranging. The SPAN potentiometer controls
the maximum level. Figure 4-4 shows the location of the ZERO and
SPAN potentiometers for each channel on a low-voltage analog input
card.
4
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