Bnc 645 User Manual download pdf (Page 74)

current cycle and then stops at the same voltage level as the

starting burst phase. For noise waveform, the output stops

immediately when the external signal turns false.

Trigger Out Signal

Model 645 may be configured to send out a TTL-compatible square wave

at the Ext Trig connector on the rear panel with either a rising or a falling

edge at the beginning of a sweep or burst.

z With internal trigger source, the trigger out signal is a square

wave with 50% duty cycle. The period of the trigger out signal is

equal to the sweep time or the burst period.

z With the manual trigger or BUS trigger source, the trigger out

signal is a pulse with pulse width > 1 μs.

z With external trigger source, there is no trigger out signal as the

Ext Trig connector is used to receive the trigger input signal.

How to set up the trigger out signal

1. After sweep or burst mode is activated, press the Trig Setup

softkey to enter the trigger setup submenu.

Press the Trig Out softkey and then select among OFF, rising-edge

trigger and falling-edge trigger.

Press the softkey under DONE to finish the setting.

Remote interface operation

OutPut:TRIGger {OFF|ON}

OutPut:TRIGger:SLOPe {POSitive|NEGative}

5.2 Storing the instrument state

Model 645 provides five storage locations in non-volatile memory for

user to store instrument state. The stored instrument state holds all the

parameters for the selected function, including the waveform, frequency,

dc offset, amplitude, duty cycle, symmetry, modulation type and

modulation parameters.

The first location, indexed at “0”, is automatically assigned for

instrument state at power-down, but you can use any of these locations

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Bnc 645 User Manual Page 74