Racal Instruments 3155, User Manual

Page: 76 / 202

User Manual 3155
3-24 ArbConnection
Sweep
The Sweep group contains parameters for controlling sweep options.
To turn the Sweep function on and off, click on the State button in
this group. There are sub-groups in the Sweep block: Parameters,
Direction, Type, Mode and Slope.
Parameters – Allow adjustment of Sweep Stop and Sweep Time.
You can also place a marker at a position programmed by the Mark
parameter. To access the desired parameter, click on the button be-
low the parameters sub-group until the LED next to the required pa-
rameter turns on. The value 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 setting, press Execute to update the 3155.
Note
The normal color of the digital reading is dark blue. If
you modify the reading, the color changes to a lighter
shade of blue, indicating that the 3155 has not been up-
dated yet with the new parameter. Pressing Execute up-
dates the instrument and restores the color of the digital
readout to dark blue, indicating that the displayed value
is the same as the generator setting.
Also note that the digital readout has an autodetect
mechanism for high and low limits. You cannot exceed
the limits using the dial but you can if you using the
keypad. If you do, the program prevents download of il-
legal parameter and you are prompted to correct the set-
ting.
Direction – Use the buttons in this sub-group to program sweep di-
rection. Up selects sweep from the start to the stop sample clock set-
ting. Down selects sweep from the stop to the start sample clock set-
ting. Refer to Chapter 3 of this manual to learn more about sweep
operation.
Type – Use these keys to select sweep step from the two sweep
spacing options: linear and logarithmic.
Mode - The Mode sub-group selects one of the Sweep operating
modes. Choose between continuous, triggered and gated sweep.
Unlike the main trigger function, the trigger modes for the sweep
function operate in continuous mode. For example, if you place the
instrument in triggered sweep, the instrument idles at the carrier fre-
quency and execute one sweep cycle when triggered. Refer to the
appropriate section in this manual to learn more about triggered
sweep.