Operating instructions

OPERATING MANUAL 2945A
46882-311D 3-63
Parameter Test mode
Tx frequency Tx test mode
AF generator 1 frequency Tx test mode
AF generator 2 frequency Tx test mode
AF generator 1 level Tx test mode
AF generator 2 level Tx test mode
RF generator frequency † Rx test mode
RF generator level Rx test mode
Modulation generator 1 frequency Rx test mode
Modulation generator 2 frequency Rx test mode
Modulation generator 1 level Rx test mode
Modulation generator 2 level Rx test mode
AF generator 1 frequency AF test mode
AF generator 2 frequency AF test mode
AF generator 1 level AF test mode
AF generator 2 level AF test mode
RF centre frequency Spec ana.
RF frequency span ‡ Spec ana.
RF level ‡ ‡ Spec ana.
† The RF generator can be made to step up or down through each channel of a mobile radio system
type, by setting the
∆
frequency to the channel spacing frequency.
‡ The SPEC ANA mode SPAN adjustment using the
FREQ
[ ] and [ ] keys, sets the span to
predetermined values. These are not adjustable by the user. See Setting up; SPAN on page 3-53.
‡ ‡ The SPEC ANA mode RF LEVEL adjustment using the
LEVEL [ ] and [ ] keys, changes the
RF reference level in steps of 1 display division . This can be either 2 dB/div or 10 dB/div, dependent on
the value of dB/div set in the SPEC ANA mode.
Assigning
The assignment of the incremental keys is shown in the display, along with the step value.
To assign a parameter to a pair of keys, first select the parameter as if to change the value using
the data input keys, but rather than entering a new value press the orange [ALT ∆] key. Now
enter the value of the step to be incremented at each keypress, followed by the correct terminator
key.
For example to assign the FREQ [
] and [ ] keys to AF generator 1 in the Tx TEST mode and
to step up or down by 500 Hz steps, follow this procedure:-
From the Tx TEST display press the [Audio Gen] key.
Use the [Gen 1/Gen 2] key to select
Press the orange [LEVEL] key.
The
legend following will be highlighted.
Press the orange [∆ INC] key, followed by [5] [0] [0] and the [Hz] terminator key.
The display will show the legend
Increments
AF1 FREQ: 500 Hz
Now each press of a FREQ [ ] or [ ] key will increase or decrease the output frequency of AF
generator 1 by 500 Hz.
Points to note are:-
Each press of a FREQ [
] or [ ] key will be effective from the current point. Thus if the
frequency of the generator in the above example has been incremented to
1,500 Hz and then