Instruction manual

Chapter 2 Service
About the Agilent 53131A/132A Calibration Menu
2-10 Assembly-Level Service Guide
2
4 Press any one of the arrow keys until your calibration choice (that is, CAL:
OFFS2?, CAL: GAIN 1?, CAL: GAIN 2?, CAL: TI QUIK?, CAL: TI FINE?, or
CAL: TIMEBAS?) is displayed.
Note that the timebase choice (CAL: TIMEBAS?) only appears when the Timebase
Option is installed.
5 Press Enter key.
A scrolling message is displayed.
6 Follow the instructions in the scrolling message, and press Enter key to start the
calibration.
The Counter momentarily displays CALIBRATING, and then displays the calibration
test name and pass/fail status (for example, OFFS 1 PASS ).
When the calibration completes, a pass/fail message will be displayed. If the
calibration failed, then the calibration factors remain unchanged.
INFORMATION ABOUT CAL:TI QUIK? AND CAL:TI FINE?
CAL:TI QUIK? and CAL:TI FINE? are two different ways to calibrate out the
differences in electrical path length between Channel 1 and Channel 2. When you
provide the calibration signal, the instrument measures how the difference in path
length translates to an average delay between the two channels.
The Quick Time Interval Calibration requires a simple input signal. You provide on
Channel 1 a clean square wave with a rapid rise time and an approximate frequency of
10 MHz. The instrument routes the calibration signal in COMMON to both channels
1 and 2, and measures the average delay between the two channels so configured. The
advantage of the Quick Calibration is that it is easy, quick, and requires little special
equipment. The disadvantage is that the calibration term is best fit for
TI measurements configured COMMON and measured from rising to rising edge; it
leaves uncorrected a small systematic error for all other configurations. The Fine
Time Interval Calibration minimizes systematic error by calibrating the instrument in
each configuration.