HP 86037B, Instruction Manual

Page: 83 / 204

4-11
Remote Control
Setting up a Measurement
Edit the test parameters
This section describes the editing of individual collection parameters. As an
example of a collection, consider
colParms
which is a collection of parameter
objects, one for each parameter accessed in an example test. The parameter
objects are collections of variables containing information about an individual
parameter. They contain no methods. The data items might be:
Public Filter As Boolean
Public Operator As String
Public Start_Wavelength As Variant
Public Stop_Wavelength As Variant
Public Use_Ref_Wavelength As Boolean
Public Use_Wavemeter As Boolean
Public Test_Groups As Integer
Public Tests_Per_Group As Integer
Etc.
Each of these items is the contents of one of the fields in the Test Parameter
database for one of the parameters. Scalar items are accessed by using an
expression of the form,
colParms.item(“Start_Wavelength”).vValue
where the crucial part is a string whose value is the name of the parameter.
The above expression can be used on the right hand side of an assignment
expression to obtain the current value of the parameter attribute. This expres-
sion appearing on the left hand side of an assignment changes the attribute.
Accessing an item that is an array of values is done somewhat differently. The
rule to note is that you must fetch the whole array parameter first and then
get the nth element of that array. For example:
Private m_colParms As Variant
Private m_vCalWavelengths As Variant
Private m_dOneOfTheWavelengths as Double
m_colParms = colParms
m_vCalWavelengths = m_colParms.Item("Cal_Wavelength").vValue
m_dOneOfTheCalWavelengths = m_vCalWavelengths(14)