Agilent Technologies 4294A, Operating Manual

Page: 158 / 469

150 Chapter 6
Calibration
Port Extension Compensation
Port Extension Compensation
Port extension compensation is used to compensate an error caused by the electrical delay
when the 7-mm port of the 42942A Terminal Adapter or 3.5-mm port of the 42941A
Impedance Probe is extended with a one-port configuration.
Port extension compensation can be performed when “42942A Terminal Adapter (
7mm
42942A
)” or “42941A Impedance Probe (
PROBE 42941A
)” is chosen in adapter selection.
Perform the port extension compensation as follows:
Step 1. Press the
[Cal]
key to display the Calibration Menu.
Step 2. Press the
PORT EXTENSION
key to display the Port Extension Menu.
Step 3. Press one of the keys below to set the port extension value.
The current port extension value is displayed in the setting parameter area of the LCD's
upper-left side.
Step 4. Use the keys or rotary knob of the ENTRY block in one of the following ways to specify
the port extension value.
• Enter the desired value with the numerical keys (
[0]
through
[9]
,
[.]
,
[-]
) and then press
one of the unit keys (
[G/n]
,
[M/
m
]
,
[k/m]
, or
[
´
1]
).
• Turn the rotary knob ( m
m m
m ) until the desired value is set.
• Press the step keys (
[
­
][
¯
]
) to set the desired value.
NOTE You can set the port extension value in either electrical length or delay time. When the port
extension value is set by one of these keys, the value is converted to the other unit and
displayed on the bottom line of the setting parameter area in small letters. You can also see
the converted value in the setting parameter area by pressing the other key.
Step 5. Press the
EXTENSION on OFF
key to turn on the port extension compensation (pressing
the key toggles your selection).
Port Extension Value and Unit Key Stroke
Set port extension value in delay time
VALUE (TIME)
Set port extension value in electrical length
VALUE (LENGTH)
Softkey Label Port Extension Compensation
EXTENSION ON off
On (make the port extension value valid for
measurement)
EXTENSION on OFF
Off (make the port extension value invalid for
measurement)