Agilent Technologies 54503A User's Guide download pdf (Page 35)

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Chapter 1 35

Quick Start Guide

Reference Level Calibration

Recalibrating the reference level is usually necessary only when the

ambient temperature changes more than 10 degrees Celsius. Because

the spectrum analyzer continually monitors and reduces any IF errors,

executing the reference-level calibration is seldom necessary.

The reference-level calibration function

REF LVL ADJ allows the

analyzer internal gain to be adjusted. When the calibrator signal is

connected to the input, selecting a reference level equal to the

calibrator amplitude will display the signal at top-screen.

1. Turn the markers off by pressing

MKR, then MARKERS OFF.

2. Press

CAL. This accesses a menu of calibration routines. The ﬁfth

function on this new list, labeled

REF LVL ADJ, allows you to

calibrate the amplitude of the instrument.

3. Press REF LVL ADJ to activate the function.

4. To calibrate the spectrum analyzer, use the knob on the front panel

and adjust the peak of the signal to the reference level as shown in

Figure 1-9. Note the number that appears in the active function

block (number 0 in this example). This number ranges from −528 to

+528 (−33 to +33 in earlier instruments). It is a relative value

indicating how much amplitude correction was required to calibrate

the spectrum analyzer. The number is usually around 0.

If the amplitude is at either end of the range, or if it cannot be

adjusted to a value within this range, consult the calibration guide.

5. To store the value, press the

STORE REF LVL softkey. When entering

or storing a value using the data keys, the entry must be terminated

with the

ENTER key, located in the lower-right corner of the analyzer.

Figure 1-9 Peaked Signal to Reference Level

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Agilent Technologies 54503A User's Guide Page 35

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