Specifications

Chapter 14 239
Outline of Programming Using COM
Outline of E4991A COM
14. Outline of Programming Using COM
Limitations on using the E4991A COM object
When the E4991A cannot be controlled by only using a E4991A COM object, it is
necessary to combine the following COM object methods with their corresponding
E4991A GPIB commands.
• Output method on page 543
• Enter method on page 542
• Query method on page 543
Comparison of COM objects and GPIB commands
The following table compares the E4991A’s COM objects and GPIB commands
Table 14-1 Function comparison of GPIB commands and COM objects
Item Controls GPIB command COM object
Setting measurement conditions/read Sets measurement conditions. Dedicated GPIB commands
are prepared.
No dedicated COM interface is
prepared.
Preparing for accurate measurement
(calibration/fixture compensation)
Sets conditions for
calibration/fixture compensation
and data measurement. Also
switches on/off functions after
data measurement.
Dedicated GPIB commands
are prepared.
No dedicated COM interface is
prepared.
Measures calibration data/fixture
compensation data.
Use the following COM
interfaces.
• CalMeasure method on
page 533
• CompenMeasure
method on page 534
Detects the start/end of
calibration data/fixture
compensation measurement.
Use the GPIB Status report
system.
Detecting the start of measurement
(trigger) and completion of
measurement (sweep completion)
Sets trigger to start measurement. Dedicated GPIB commands
are prepared.
No dedicated COM interface is
prepared.
Performs the sweep once. Use the following COM
interface.
• SingleMeasure method
on page 532
Waits for the end of sweep.
(Detects the end of sweep.)
Use the GPIB Status report
system.
Confirms waiting status for the
trigger.
Use the following COM
interface.
• WaitForEvent method
on page 536
Reading/writing measurement data Selects data transfer format. Dedicated GPIB commands
are prepared.
No dedicated COM interface is
prepared.
Reads/writes internal data array. No dedicated COM interface is
prepared.
In Enter method on page 542,
internal data array can be read
by specifying how to read the
data array.
Processing measurement result Uses marker function and
equivalent circuit analysis
function.
Dedicated GPIB commands
are prepared.
No dedicated COM interface is
prepared.