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4
ArbConnection
The Control Panels
Figure 4-7, the Arbitrary & Sequence Panel
SCLK
The SCLK (Sample Clock) group is comprised of parameters that
control the sample clock frequency. The sample clock setting
affects the 2074 in arbitrary mode only.
The sample clock rate is programmed in units of S/s (samples per
second) and will affect the instrument only when it is programmed
to output arbitrary or sequenced waveforms. The SCLK parameter
has no effect on the frequency of the standard waveforms.
The two switches in the SCLK group select between internal and
external sample clock inputs. The internal is the default setting.
When you select the external sample clock option, make sure an
appropriate signal is connected to the external sample clock
connector on the rear panel.
To access the required parameter, click on the button until the LED
next to the required parameter turns on. The value that is
associated with the lit LED is displayed on the digital display. You
can use the dial, keyboard, or the [↑] [↓} keys to adjust the readout
to the required setting. After you modify the reading, press Execute
to update the 2074 with the new reading.
10 MHz Ref
The 10 MHz Ref controls toggle between an internal and external
references. The default setting is internal, which provides frequency
accuracy of 1 ppm. If such accuracy is not sufficient for your
application, click on the external option but make sure that a
reference source is applied to the rear panel connector; otherwise,
the accuracy of the output will deteriorate completely.
Sequence
The Sequence Advance Mode group provides control over advance
4-13
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