and is used as an extension cable on the test port to ensure accurate and repeatable measure-
ments. This phase stable cable can be moved and bent while making a measurement with-
out causing errors in the measurement.
NOTE: The test port extension cable should have the appropriate connectors
for the measurement. Use of additional connector adapters after the test port
extension cable can contribute to measurement errors not compensated for
during calibration.
Calibration Verification
During the calibration process in Return Loss mode, either with discrete calibration compo-
nents or with the InstaCal module, there are typical measurement levels expected. Verifying
the measurement levels displayed on the screen during calibration can save valuable time in
the field.
Trace Characteristics in Return Loss Mode
As the discrete calibration components are connected to the Site Master RF out port, the
following measurement levels will be displayed on the screen:
q
When an OPEN is connected, a trace will be displayed between 0-10 dB.
q
When a SHORT is connected, a trace will be displayed between 0-10 dB.
q
When a LOAD is connected, a trace will be displayed between 0-50 dB.
When an InstaCal module is connected to the Site Master RF out port, the following mea-
surement levels will be displayed on the screen:
q
When the Site Master is measuring an equivalent OPEN, a trace will be displayed
between 0-20 dB.
q
When the Site Master is measuring an equivalent SHORT, a trace will be displayed
between 0-20 dB.
q
When the Site Master is measuring an equivalent LOAD, a trace will be displayed
between 0-50 dB.
The following procedures explain standard OSL, FlexCal, and InstaCal calibration meth-
ods. Refer to Figure 3-2 for a calibration setup diagram.
Chapter 3 Getting Started
3-3
