B&K Precision 4034 - Manual - Manual (Page 21)

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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 and duty cycle. 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.
F3: DELAY - This parameter is used in two instances. The first is to set the delay of the pulse in the
single pulse mode. The delay governs the time from the SYNC signal to the start of the
pulse. The second instance is the double pulse mode. Here the delay governs the time
from the SYNC pulse to the beginning of the second pulse. The minimum and
maximum values of the delay are dependent on the values of the period, width and
leading and trailing edge times. The delay range is 0 to 9.80000 s.
Delay Menu
F4: INDEP/CH1 - When channel 2 is selected using the CHAN button, this menu option will appear. By
default, it is selected in INDEP, which makes channel 2 an independent channel. If
CH1 is selected, channel 2 and channel 1 will have matching clock and trigger. The
period and frequency will also be the same as channel 1. In this mode, all triggering
options will not be available in the MODE menu, as it will be dependent on channel 1
settings. Frequency and Period adjust options will also be disabled. Aside from these,
all other parameters are still adjustable.
F5: SINGLE/DOUBLE - The unit can be set to generate either a SINGLE pulse or a DOUBLE pulse. In the
double pulse mode, the first pulse is generated without delay from the start and the
second pulse in generated after a delay, from the start of the period, as determined by
the DELAY parameter. Thus, in order to generate a double pulse, the delay must first
be set, and then the double pulse may be set on. The double pulse mode state is toggled
using the F5 key. The minimum and maximum values of the delay are dependent on the
values of the period, width, delay and transition parameters.