Agilent Technologies 8753ET Uživatelská příručka stáhnout pdf (Strana 383)

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Chapter 7 7-17

Programming Examples

Measurement Setup Examples

‘***************************************************************************

‘* hp875x Instrument Driver EXAMPLE #1A *

‘* *

‘* This program demonstrates setup of various measurement parameters such *

‘* as start frequency, stop frequency, etc. The program first selects one *

‘* type of measurement to be viewed using dual-channel display format. *

‘* The specified start and stop frequencies are then programmed and the *

‘* analyzer display is autoscaled. The program concludes by displaying *

‘* four types of measurements simultaneously. *

‘***************************************************************************

Private Sub cmdExecute_Click()

Dim vi As Long

Dim err_status As Long

Dim nwa As String

Dim retString As String

Dim msg As String

Dim f_start As Double

Dim f_stop As Double

Dim iRetVal As Integer

Dim reply As Integer

lstText.Clear

lstText.AddItem “Example 1a --”

lstText.AddItem “This program demonstrates setup of various measurement parameters

such”

lstText.AddItem “as start frequency, stop frequency, etc. The program first selects

one”

lstText.AddItem “type of measurement to be viewed using dual-channel display format.”

lstText.AddItem “The specified start and stop frequencies are then programmed and the”

lstText.AddItem “analyzer display is autoscaled. The program concludes by displaying”

lstText.AddItem “four types of measurements simultaneously.”

lstText.AddItem ““

nwa = “GPIB0::16::INSTR”

‘ Initialize the instrument

Call initialize(nwa, VI_FALSE, VI_TRUE, vi)

‘ Set the timeout to 3000 msec (3 sec)

err_status = hp875x_timeOut(vi, 3000)

Call checkErr(vi, err_status)

‘ Set up measurement and display

‘ Channel 1

err_status = hp875x_channelSelect(vi, hp875x_CH1)

Call checkErr(vi, err_status)

‘ Turn auxiliary channel off.

err_status = hp875x_auxChannel(vi, hp875x_CH1, hp875x_OFF)

Call checkErr(vi, err_status)

‘ Return Loss measurement, no parameter conversion

‘ For 8719ET/8720ET/8722ET/8753ET, hp875x_S_PAR11 is interpreted as hp875x_REFL

err_status = hp875x_measType(vi, hp875x_S_PAR11, hp875x_CONV_OFF)

Call checkErr(vi, err_status)

‘ Log magnitude display

err_status = hp875x_displaySelect(vi, hp875x_CH1, hp875x_DISP_DATA, hp875x_DISP_LOGM)

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