BNC 630 - Manual (Page 60)

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7.4 Arbitrary Waveform Mode
Figure 7.4-1: Arbitrary Waveform Mode display
1. Int Clock / Ext Clock / Lock Master Lock slave mode
In this field select the clocking mode for the arbitrary waveform system:
Internal Clock - The sample clock is generated internally. The clock frequency is entered directly via the front panel.
External Clock - The sample clock (40 MHz max) is taken from the External Arb Clock input on the back panel.
*** Warning *** TTL/CMOS levels (0V to +5V) only.
Lock Master - The unit provides the master timing signals for locking multiple 630 arb generators together.
Lock Slave
- The unit receives all timing signals from a master unit. Used when locking multiple 630 arb’s together.
For more information on locking arbs together, see the section 7.9.
2. Phase
This field is used during Multiple Unit Locking and only appears when the unit is in Lock Slave mode. It allows you to specify a
phase offset of the arbitrary waveform relative to the waveform being generated by the Master Unit. For more information, see
section 7.9.
3. Continuous/Triggered mode
In this field select whether the waveform is generated continuously or on a single event basis. If you select Continuous mode, then
the waveform is immediately restarted once the last point is reached. If you select a Triggered mode, then the waveform generation
is halted after the last point is reached, and the waveform is not restarted again until another trigger occurs. The trigger can come
from three sources:
1. Pressing the Trigger key
2. Applying a low-to-high transition on the Ext. Trig In connector
3. Sending an ASCII "T" to the RS232 port
The 630 will simultaneously accept a trigger from all of the above sources.
To set Continuous mode, press 1 . To set Triggered mode, press 0 . Pressing any arrow key or rotating the wheel will toggle the run
mode between Continuous and Triggered.
4. Clock Frequency
In this field enter the Arbitrary Waveform clock frequency. This is the frequency at which your waveform values are sent to the
Digital to Analog converter (DAC). You may enter from 0 Hz (DC) to 40.0000000 MHz in .01 Hz steps. If a value of 0 Hz is
entered, the arbitrary waveform clock is halted.
5. Level
In this field enter the output level, from 4 mVp-p to 10 Vp-p in 1 mV steps. This level is the peak-to-peak voltage swing of the
waveform across a 50 ohm load. Into an open circuit, the voltage swing will be twice the specified peak-to-peak value.
Offset
Enter a DC offset voltage by pressing the Offset key. For more information refer to section 4.4.
Arb Mode Int Clock Phase: 126.35 deg
Cont Clk Freq: 40,000,000.00 Hz 1,000 mV
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