1-3
Operation
Quick Overview
The following table describes the prefixes that apply to the various 8648 models equipped
with an LCD.
The display contrast of the LCD can be achieved using the adjustment that is located on
the rear panel of these instruments. Note that this adjustment is only available for
instruments equipped with an LCD. It allows you to adjust the contrast of the LCD. Turn
the adjustment to optimize the display for viewing from most angles. If the display is
blank, first attempt to adjust the display contrast before returning the instrument for
service.
The following table describes the prefixes that apply to the various 8648 models equipped
with a VFD.
The VFD is a 2x40 display. The intensity of this display is at 100% and cannot be adjusted.
3. Function and Data Keys
The keys in the FUNCTION and DATA blocks allow you to enter values for setting the
frequency, amplitude, and modulation level of the RF output signal.
If Option 1EP is present, the
FM (ENCODER) key will toggle between pager encoder
(ENCODER) mode and FM mode.
If Option 1EP is present and the signal generator is in the ENCODER mode, the
rad dBµV
key functions as a SHIFT key. This key lets you input alphabetical characters using the
DATA and MODULATION SOURCE blocks when you are in pager encoder mode.
If Option 1EP is present and the signal generator is in the ENCODER mode, the
MHz
dB(m)
key functions as an ENTER key. The ENTER key must be used to store any numeric
or alphabetic characters entered by way of the DATA and MODULATION source blocks.
A. Liquid Crystal Display (LCD)
(labels located above the display)
8648A Prefix 8648B Prefix 8648C Prefix 8648D Prefix
3636A and below 3623A and below 3623A and below 3613A and below
3643U and below 3642U and below 3642u and below 3642U and below
A. Vacuum Fluorescent Display (VCD)
(labels located below the display)
8648A Prefix 8648B Prefix 8648C Prefix 8648D Prefix
3636A and above 3623A and above 3623A and above 3613A and above
3643U and above 3642U and above 3642u and above 3642U and above
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