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Graphics This menu presents additional graphic display controls:
CONNECT
[GRCP]
This control is normally ON and causes the data between samples
to be interpolated and lines drawn between sample points. When
OFF, the sample points only are displayed as pixels.
TRACKING
[GRTMM]
The number of scans of graph data between resetting the tracked
min and max when in graph mode. Select SINGLE or INFINITE.
REF LINE
[GRFS]
Causes a dotted horizontal line to be drawn at the reference point
on the graph screen; normally OFF.
PRE TRG%
[GRPTP]
Percentage of the screen that displays pretrigger information at the
best resolution available. The display shows an ‘x’ marking the trig
-
ger point on the time axis.
Data before the actual trigger event is not available. The trigger ref
-
erence point (x) indicates the active trigger point after the DELAY
setting in the System|Profile menu. Providing sufficient delay has
been set, the PRE TRG% can be used to move this reference to
anywhere on the screen. The amount of valid data displayed before
the trigger reference point is dependent on the System|Pro-
file|DELAY setting. Also see Figure 4-4, page 4-20.
Secure
[SECURE]
Normally OFF. When the system is powered on the ML2430A Series returns to
the state it was in when it was powered off. This includes all the offset tables, cali-
bration adjust values, etc.
If Secure is set to Clear memory, non-volatile memory is disabled and all stored
values are reset to the factory defaults when the system is powered on. As long
as this selection is set to Clear memory, the system will load the presets (see Ap
-
pendix A, Section A-3) every time it is turned on.
Identity
[*IDN, OI]
This selection will display the installed firmware version, the instrument serial
number, and the instrument type (model number).
4-8
CAL/ZERO MENU
The Cal/Zero menu establishes the 0.0 dBm reference calibration and zeroing of
the sensors. Refer to Chapter 5 for specific procedures.
Zero/Cal This function zeros and then sets the 50 MHz, 0.0 dBm reference of the con
-
nected sensor. In dual sensor systems with both sensors connected, sensor A or
B must be selected.
Cal 0 dBm
[CAL]
References the connected sensor to 0.0 dBm at 50 MHz. In dual sensor systems
with both sensors connected, sensor A or B must be selected.
Zero
[ZERO]
Zeros the connected sensor. Zeroing a power sensor compensates for noise and
thermal EMF of the device under test. It is recommended prior to taking important
power readings in the bottom 20 dB of a power sensor’s dynamic range. In dual
sensor systems with both sensors connected, sensor A or B must be selected.
4-34 ML2430A OM
CAL/ZERO MENU OPERATION
NOTE
These options allow ei
-
ther the min/max of
each sweep to be dis
-
played (single) or the
conventional method
for tracking variation of
levels over an ex
-
tended period of time
(infinite).