User`s guide

172 Chapter 12
Sample Application Programs
Basic measurement (measuring a band pass filter)
Lines 510 to 520 These lines prompt the user to connect the DUT and wait for [Enter] to
be pressed after the DUT is connected.
Lines 540 to 560 These lines trigger the instrument, and waits until the measurement
cycle finishes.
Line 580 This line executes auto scale for the trace 1 of channel 1.
Lines 620 to 650 These lines turn on the display of marker 1, move the marker to the
position where the stimulus value is equal to Center, read out the
response value at the marker and assign the value to the Resp variable.
Lines 670 to 710 These lines configure the system to generate an SRQ when it cannot
perform Bandwidth Search due to an error.
Lines 730 to 740 These lines set the branch target for an SRQ interrupt to enable SRQ
interrupts.
Lines 750 to 790 Sets the bandwidth definition value to -3 dB and the bandwidth search
result display to on, reads out the bandwidth search results (bandwidth,
center frequency, Q value, and insertion loss), and stores them into the
variables Bwid, Cent, Q, and Loss, respectively.
Lines 830 to 900 These lines define an error handler that retrieves the error number and
error messages for the error, then assign 0 to Bwid, Cent and Q, Resp
(response value at marker 1) to Loss.
Lines 930 to 940 These lines calculate the 2 (higher and lower) cutoff frequencies from
the values in the Bw and Cent variables and stores them into the Cut_l
and Cut_h variables.
Lines 980 to 1040 These lines display the measurement results (values of Bwid, Cent, Q,
Loss, Cut_l, and Cut_h).
Lines 1060 to 1070 These lines prompt the user to decide to perform another
measurement. When
[y] is pressed followed by [Enter] key, the
program will return to the part where the DUT is connected and
continue measurement.