Specifications

Operating Manual SEFRAM 4451

M4451 A00

3.6 MENU Keys

These keys select the main menus for displaying or changing a parameter, function or mode.

3.6.1 PARAM Menu

This key selects and displays the pulse timing parameters, the double pulse mode and allows changing the

parameter data.

Parameter Menu

F1: PERIOD/FREQ - Selects and displays the period or the pulse frequency. Change the value using

the shift keys, rotary knob or numerical keys. If a certain setting can't produce

the waveform at the desired parameters, the generator displays an error message.

While the pulse mode is set to external width on, the value of the period may be

changed but the value is not displayed, since the actual value of the period is set

by the external pulse

F2: WIDTH/DUTY - Selects and displays the pulse width. The minimum value of the width is 10ns,

with the maximum value dependent on the values of the period, delay and

transition times.

The Duty Cycle is defined as the ratio of the pulse width to the pulse period.

Changing the duty cycle will therefore change the width accordingly. The duty

cycle has both a value and a state (on or off). On Power On the duty cycle is off.

This means that the width is determined by the width parameter only. The duty

cycle is set to ON by entering a value. The value may then be changed using the

rotary encoder or the numeric keys. When the duty cycle is on, changing the

period will cause a change in the width such that the duty cycle is kept constant.

The duty cycle is set to OFF by changing the width value. The instrument will

store the last value of the duty cycle, and set the duty cycle to this value when it

is next set to ON. The duty cycle has an absolute range of 1% to 99%, but the

actual value is limited by the values of the period, delay and transition times.