Technical data

4-5
Hardkey and Softkey Reference
BEEP FAIL on OFF. turns the limit fail beeper on or off. When limit testing is on and the fail beeper is on, a beep is
sounded each time a limit test is performed and a failure detected. The limit fail beeper is independent of the warning
beeper and the operation complete beeper.
BEEP WARN on OFF. toggles the warning annunciator. When the annunciator is on it sounds a warning when a
cautionary message is displayed.
BIAS MODE on OFF. when this mode is ON, the analyzer automatically performs periodic biasing of the modulator in the
optical test set.
BLANK DISPLAY. switches off the analyzer's display. This feature may be helpful in prolonging the life of the LCD in
applications where the analyzer is left unattended (such as in an automated test system). Pressing any front panel key
will restore the default display operation.
BRIGHTNESS. adjusts the brightness of the color being modified. Refer to the user’s guide for an explanation of using
this softkey for color modification of display attributes.
BW DISPLAY on OFF. displays the measured bandwidth value to the right of the pass/fail message.
BW MARKER on OFF. displays the cutoff frequencies of the bandwidth using markers on the data trace.
BW TEST on OFF. turns bandpass filter bandwidth testing on or off. When bandwidth testing is on, the analyzer locates
the maximum point of the data trace and uses it as the reference from which to measure the filter’s bandwidth. Then,
the analyzer determines the two cutoff frequencies of the bandpass filter. The cutoff frequencies are the two points on
the data trace at a user-specified amplitude below the reference point. The cutoff frequencies are also referred to as
the N dB Points where “N” is defined as the number of decibels below the peak of the bandpass that the filter is
specified. (The amplitude is specified using the N DB POINTS softkey.) The bandwidth is the frequency difference
between the two cutoff frequencies. The bandwidth is compared to the user-specified minimum and maximum
bandwidth limits (entered using the MINIMUM BANDWIDTH and MAXIMUM BANDWIDTH softkeys.) If the test
passed, a message is displayed in green text in the upper left portion of the LCD. An example of this message is: BW1:
Pass, where the “1” indicates the channel where the bandwidth test is performed. If the bandwidth test does not pass,
a fail message indicating whether the bandpass was too wide or too narrow is displayed in red text. An example of this
message is BW1: Wide.
C0. is used to enter the C0 term in the definition of an OPEN standard in a calibration kit, which is the constant term of
the cubic polynomial and is scaled by 10
−15
.
C1. is used to enter the C1 term, expressed in F/Hz (Farads/Hz) and scaled by 10
−27
.
C2. is used to enter the C2 term, expressed in F/Hz
2
and scaled by 10
−36
.
C3. is used to enter the C3 term, expressed in F/Hz
3
and scaled by 10
−45
.
Cal. key leads to a series of menus to perform measurement calibrations for vector error correction (accuracy
enhancement), and for specifying the calibration standards used. The CAL key also leads to softkeys which activate
interpolated error correction and power meter calibration.
CAL FACTOR. accepts a power sensor calibration factor % for the segment.
CAL FACTOR SENSOR A. brings up the segment modify menu and segment edit (calibration factor menu) which allows
you to enter a power sensor's calibration factors. The calibration factor data entered in this menu will be stored for
power sensor A.
CAL INTERP ON off. sets the preset state of interpolated error-correction on or off.
CAL FACTOR SENSOR B. brings up the segment modify menu and segment edit (calibration factor menu) which allows
you to enter a power sensor's calibration factors. The calibration factor data entered in this menu will be stored for
power sensor B.
CAL KIT. indicates the currently selected cal kit and leads to the select cal kit menu, which is used to select one of the
default calibration kits available for different connector types. This, in turn, leads to additional menus used to define
calibration standards other than those in the default kits “Electrical Calibration Kit Modifications” on page 5-43. When
a calibration kit has been specified, its connector type is displayed in brackets in the softkey label. The cal kits available