Anritsu ML2430A operation manual 8CAL/ZERO Menu

CAL/ZERO MENU OPERATION

Graphics

This menu presents additional graphic display controls:

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).

CONNECT [GRCP]

TRACKING [GRTMM]

REF LINE

[GRFS]

PRE TRG%

[GRPTP]

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.

The number of scans of graph data between resetting the tracked min and max when in graph mode. Select SINGLE or INFINITE.

Causes a dotted horizontal line to be drawn at the reference point on the graph screen; normally OFF.

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 SystemProfile 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 SystemPro- fileDELAY setting. Also see Figure 4-4,page 4-20.

Secure

[SECURE]

Identity

[*IDN, OI]

4-8CAL/ZERO MENU

Zero/Cal

Cal 0 dBm

[CAL]

Zero

[ZERO]

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.

This selection will display the installed firmware version, the instrument serial number, and the instrument type (model number).

The Cal/Zero menu establishes the 0.0 dBm reference calibration and zeroing of the sensors. Refer to Chapter 5 for specific procedures.

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.

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.

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