
2-6 Using the Calibrator
UM4.6:CS6003 Original — December 1991
The CAL LOW mode allows the user to set the 0 percent (ZERO) voltage
level on the analog-to-digital conversion circuit and check the 0 percent
value of the analog current output. When in the CAL LOW mode,
discrete outputs on the controller card are also tested. The CAL LOW
switch is a pressure-sensitive switch with an LED indicator. The CAL
HIGH and SPAN modes should not be entered during a procedure until
the CAL LOW mode has been entered at least once.
The CAL HIGH mode allows the user to set the 100 percent (SPAN)
voltage level of the analog-to-digital conversion circuit and to set the 100
percent value of the analog current output. When in the CAL HIGH
mode, discrete outputs on the controller card are also tested. The CAL
HIGH switch is a pressure-sensitive switch with an LED indicator to show
the switch is activated.
In the SCAN mode, the controller multiplexing operation is checked, the
lack of crosstalk between analog inputs is verified, and a linearity test is
performed. The SCAN mode also allows any discrete inputs on the
controller card to be checked. The SCAN switch is a pressure-sensitive
switch with an LED indicator to show the switch is activated.
2.2.2.17 Status Indicator
There are three groups of status indicators that display the results of
some of the various test procedures.
DI STATUS indicators — consist of three LEDs that indicate the
number of discrete inputs active on a card being calibrated.
CAL STATUS indicators — display the result of a comparison
between the calibrator internal 5 volt reference and a voltage present
in the card being calibrated. The CAL STATUS indicators show when
a potentiometer on the card being calibrated has been adjusted
properly. The CAL STATUS indicators also show when the SCAN
mode detects a malfunction in the card being calibrated.
RELAY TEST/RESET TEST indicators — used only during
calibration procedures for the controller and multiplexer power
conversion cards.
2.2.2.18 Data Switches
The ten data switches labeled MUX DATA BYTE 1, MUX DATA BYTE 2,
and MUX DO/DI OR CONTROLLER DI, are used when calibrating or
testing cards in the multiplexer family. The switches simulate discrete
inputs and also load data into the analog output cards. The data
switches are pressure-sensitive switches with LED indicators to show
when a switch is activated.
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