Measurement Computing LogBook Series - Manual (Page 158)

LV-32 LogView 989592 Software Reference
The next figure shows the columns accessible with the Storage tab selected (default). If channels are
sampled only to derive calculated channels or stimulate outputs, they do not need to be stored. For
example, a channel can be sampled at a high rate to prevent aliasing while a calculated channel is used to
derive and save its maximum every 10 seconds. In this case, only one sample every 10 seconds is saved,
rather than thousands. The Sample Rates columns in read-only mode are set up in the Acquisition
Configuration dialog box where up to 4 timebases can be defined. For applications with slow and fast
signals, slow signals can be sampled at a slower rate, optimizing the system’s storage capacity. The base
rate A can be divided by 3 divisors for rates B, C, and D (see page LV- 43).
Analog Input Channel Configuration, Storage Tab Selected
Analog Input Channel Configuration, DBK Parameters Tab Selected
The above figure shows the DBK Parameters tab used to configure channels with programmable DBK
parameters. Depending on the DBK, values must be entered in the Param.1 to Param.4 columns. One
such example is the DBK4 that requires filter settings; some other DBK cards also have programmable
parameters.
Some DBKs have hardware switches and jumpers for configuration. When using such
DBKs, corresponding parameters must be set in the
LogBook Hardware Configuration window.
Analog Input Channel Configuration, User Scaling Tab Selected
The User Scaling tab shown above has Scale and Offset columns. In User Scaling, you create a transfer
function so LogView will display units that are useful for your application. Here, you can arbitrarily
define your Units (apples, oranges, whatever) based on the raw input value, typically Volts. To do so, type
your new unit name in the Units column and select an appropriate range (e.g. unipolar). Then, enter its
linear scale relation to the Volt (e.g. 25 pounds per Volt) and any offset from 0 (e.g. the empty basket
measures 0.1 V). The reading and range columns change accordingly.