Specifications

Analog input SCP’s display volts and digital input SCP’s display
digital state information in section F. Analog output SCP’s are both
input and output at the same time. Pressing STOP will temporarily
pause the acquisition of data.
B. This is the diagnostics section. The card can be RESET at any time to
stop measurement operations, calibration or testing. The CALIBRATE
and TEST keys are not active while START in section A is active.
Likewise, neither CALIBRATE nor TEST can be active at the same
time. CALIBRATE should be performed after the VT1419A has
warmed up for 1 hour. Calibration is necessary whenever any SCP
modules are added or moved. TEST allows the integrity of any SCP
channels to be checked. If errors are present with either calibration or
testing, indicators in section D will be lit and CAL/Test Results? and
ERROR? can be pressed to determine what errors are present. Both
TEST and CALIBRATE may take from 3 to 10 minutes depending
upon the configuration of SCP’s. Also, CALIBRATE performs a
CAL:STORE ADC which stores the calibration constants in
non-volatile RAM.
C. These two display areas will indicate errors from calibration or testing.
CAL/Test Results? or ERROR? must be pressed to see these results.
D. These are the status monitor lights. CARD is either IDLE, MEAS, or
BUSY, which indicates no operations pending, START active or
performing CALIBRATION or TEST. CAL/TEST is either OK or an
ERR condition. If ERR, data will be present in section C. ERROR is
either OK or ERR which indicates the need to press the ERROR?
button.
E. This is the strip chart area. Up to three traces can be selected from any
of the input channels seen in the section F display. Pressing INPUT
1,2,3 will provide valid selections. The current channel will be
displayed next to the strip chart. Traces are colored. The CLEAR
button will erase all current traces. Auto Scale will compress all
current data into the available window. Update rates vary with the
processing power of the computer, but can range from sub-second to
several second updates.
F. This is the section that displays the type of SCP and its channel input
values when START is active. Note that the beginning channel
number is displayed in the upper left corner of each SCP window.
Channel data is displayed as 0,1,2.... so that designator must be added
to the upper left corner number to obtain the actual channel number of
the SCP.
G. This is the Analog Output selector. Pressing SELECT OUTPUT will
provide a list of all available analog output channels. Choosing one
will allow the output of any analog output channel to be modified.
Since all analog output SCP’s also display their output values as input
channels, the results of changing the output values in section F can be
seen when START is active. Please note that these output values
are only accurate to within 10% of the programmed value. These are
VEE Programming Examples
Virtual Front Panel Program
Chapter 5 145
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