Datasheet

Evaluation Board User Guide UG-257
Rev. 0 | Page 7 of 20
MAIN WINDOW
Menu Bar
File
The File menu allows the user to write the current set of data
to a file for later use, log data as it is gathered, and exit the
program.
Board
The Board menu allows the user to alter the contrast on the
LCD display.
Buttons
Delete Data/Clear Graphs
This button allows the user to delete the data displayed in
the graph.
ADC Reset
This button allows the user to reset the AD7195 to its default
(power on) settings.
ADC Setup
This button opens the ADC Setup window, which allows the
user to configure the AD7195.
Low Noise Quick Test
This button allows the user to access the noise testing software.
WeighScale Demo
This button allows the user to access the weigh scale
demonstration software.
User Units Setup
This button allows the user to change the display units on the
graph and histogram.
Sampling
This button allows the user to sample continuously or to
sample a specific number of samples. When the option
Sampling: Capture Defined Sample Set is selected, the
sample size is entered in the Samples box.
Start Sampling
This button allows the user to read samples from the AD7195.
Data Section
Display Units
This button allows the user to display the conversions in hex,
decimal, volts, or in user specified units. If the conversions are
displayed in volts, the value of the reference voltage must be
entered in the Vref text box.
Autoscale
This button allows the user to enable or disable the autoscale
function on the waveform plot.
X-scale
This button allows the user to have a fixed x-axis or a dynamic
x-axis. When the x-axis is fixed, the number of samples to
display is entered in the X-scale Samples text box.
Analysis Section
Channel
The data channel to be analyzed is selected using this button.
After Sampling During Sampling
The software can process the conversions as they are being
gathered or can process the samples when the ADC has
completed the selected number of conversions.
Analyse All Samples/Analyse Last # Samples
This button allows the user to fix the sample size used for
analyzing. Alternatively, the software can process all samples
gathered. When Analyse Last # Samples is selected, the sample
size must be entered in the Last # Samples text box.
The software captures all samples generated by the AD7195. If
the software fails to gather all samples, then the message shown
in Figure 8 appears. The software may drop samples because
• The data is being analyzed in parallel with the gathering
of samples. The user should delay the analysis until the
samples are gathered.
• Other programs are running on the PC.
• The PC is too slow.
09727-008
Figure 8. Error Message When Samples Are not Captured