Tabor Electronics 5251, Руководство пользователя

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3
ArbConnection
The Control Panels
3-13
SCLK
The SCLK (Sample Clock) group is comprised of parameters that
control the sample clock frequency. The sample clock setting
affects the 5251 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 5251 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
modes for the sequence generator. Advance options are: Auto,
Stepped, Single and Mixed. Refer to the 5251 manual to find out
more when and how to use these advance modes. You should be
careful while selecting modes because it is possible to cause
settings conflict, for example, if you select the Single option before
you modified the run mode to Triggered.
Memory Management
The memory management group provides access to the memory
partition and waveform studio screens. The Waveform Partition
button opens a screen as shown in Figure 3-8 and the Waveform
Studio button opens a screen as shown in Figure 3-9. Information
how to use these screens is given in the following paragraphs.