LOCAL OPERATION
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(3) Select the A, B or C source for sweeping by pressing the appropriate [A Swept Source],
[B Swept Source] or [C Swept Source] key.
(4) Select the sweep mode between single shot and continuous sweeping by pressing the
[Sweep] key which toggles between [Single Sweep] and [Cont Sweep].
(5) For external triggering press [Ext Trig Off] to inhibit the external trigger or press one of the
following keys to select the appropriate trigger mode:
[Ext Trig Start]
−
The first trigger input causes the carrier sweep to commence sweeping.
Any other trigger inputs whilst sweeping are ignored. Only at the end of each sweep is
the trigger latch reset ready for the next input.
[Ext Trig StrtStop]
−
The first trigger input starts the carrier sweep and the following trigger
input pauses it, so that the user can investigate a particular point of interest. The next
trigger input continues the sweep from where it was paused. At the start of each sweep
the trigger latch is reset ready for the next input.
[Ext Trig Step]
−
Each trigger input steps the sweep on by one frequency step. The trigger
latch is reset after each step ready for the next step.
(6) Pressing [No Swept Source] disables sweep mode.
(7) If no source has been selected for sweeping, pressing [EXIT] will return you to the Carrier
Sweep Mode Menu. Otherwise, the Sweep Control screen will be displayed.
Sweep control
(8) The Sweep Control screen displayed is similar to that shown in Fig. 3-20 below. This is used
to perform the sweeping operation.
B3428
Fig. 3-20 Sweep control screen in sweep mode (B and C sources coupled to A source)
(9) Enter the sweep start and stop frequencies using the [Start Freq] and [Stop Freq] keys.
(10) Press [Step Size] and enter the step size in the range 1 Hz to the instrument maximum
frequency, to a resolution of 1 Hz.
(11) Press [Step Time] and enter the step time in the range 50 ms to 10 s to a resolution of 1 ms.
(12) To start the sweep press [Start Sweep]. The key changes its function to [Stop Sweep] and
Sweep Status changes from WAITING FOR TRIGGER to SWEEPING. The displayed Sweep
Freq changes to show the progress of the sweep.
(13) The sweep can be stopped at any time by pressing [Stop Sweep]. This causes the key
function to change to [Continue Sweep] and Sweep Status changes to PAUSED.
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General