BNC 745 - Manual (Page 14)

Model 745 Digital Delay Generator. November 2013
Burst mode
The Burst mode is defined by its trigger source (internal, external, software / single shot or
repetitive), its pulse number in each burst and the period between pulses. A pulse train can be
independently set and defined on each channel: amplitude, width and delay are defined in the
corresponding channel menu. An example of Burst mode is depicted on Figure - 9.
To generate a burst on a specified channel, first, the user has to configure the Burst mode itself
(trigger, pulse number and pulse period) and then select “Burst (BST)” in the trigger source selection
of the concerned channel.
Output channels
A T0 output pulse is the time reference of the delay output. It is generated for each selected trigger.
Each output delayed pulse values T1 to T4 can be independently tuned in level, absolute or relative
delay and width. All values (delay, delay reference, level, width, gate) are saved in memory except
the trigger source.
Each output delayed pulse values (T5 to T8) can be independently tuned in absolute or relative delay
and width. All values (delay, delay reference, width) are saved in memory except the trigger source.
Calibration parameters are saved onboard.
After the power on, all trigger sources are off.
It has to be noticed that several output channels can only be triggered by the same source, that is to
say an internal OR external source.
Gate mode
Each channel can be independently or simultaneously inhibited by the Gate in input signal. A Gate
menu is available in the main menu of the MOD745 device and in each Tx sub-menu. 2 different
modes can be selected in the general Gate menu:
• 1 “GENERAL” mode to inhibit simultaneously all channels,
• 1 “CHANNEL” mode to inhibit independently each channel by setting in each Tx sub-menu
the desired Gate state (‘1’ active, ‘0’ inactive).
Configuration summary
On Figure - 5 is presented a functional diagram of the device. The different operation modes are
illustrated.
Figure - 5. Functional Diagram
© Berkeley Nucleonics Corp. 13 Model 745 User Manual