HP 181A manual Information about Calti QUIK? and Calti FINE?

2

Chapter 2 Service

About the HP 53131A/132A Calibration Menu

4Press 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.

5Press Enter key.

A scrolling message is displayed.

6Follow 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.

2-10 Assembly-Level Service Guide