Operating instructions

OPERATING MANUAL 2945A
46882-311D 3-9
(31) Serial port. The SERIAL PORT connector provides RS232 interface facilities for remote
control. It is also used for the serial output to a printer. Connection details are given in Chapter
2, under Remote control connections, RS232.
Getting started
(Applying power and selecting test modes)
The power ON/OFF switch, located on the rear of the instrument, has three positions.
Pressing the inside toggle will power up the instrument, from either AC or DC supply.
If both AC and DC supplies are connected, the AC supply will take precedence. A small trickle
charge is also supplied to the DC supply.
Pressing the toggle nearest the edge of the instrument will supply a charging current of up to 7 A
peak to the accessory battery pack from the AC mains supply.
The centre position is OFF.
With a power source connected, switching on the instrument will cause the cooling fan to operate
and one of the test mode menus to be displayed. Which screen is displayed will depend on which
store is selected as the ’Power Up From’ store on setup page 2.
The low battery warning is activated when the voltage at the DC terminals falls to approximately
11 volts. The user selectable ’Power Up From’ settings will be found useful when using the
instrument from a battery pack. This will ensures that after replacing a battery pack, the
instrument returns to the settings best suited to the tests being performed. See Setup page 2 on
page 3-12.
If you are unfamiliar with the instrument a few minutes spent exploring the setup menus and test
modes is helpful.
The following explanation of keys and menus will assist in this.
Test mode screens and menus
The six test modes are selected by pressing the appropriate MODE key. These are light blue,
with dark blue lettering. (Item 16 in Fig. 3- 1, Front panel). Select each in turn and observe the
display presented.
Each area of six soft key labels forms a menu. Various menus are called up as a result of
selecting a change of test mode or by pressing a soft key within a test mode.
Fold out diagrams will be found at the end of this chapter, which show the screens displayed
when each of the mode keys is pressed. These also show branching to the second or third level
screens and menus. A diagram of the screens accessed from the HELP/SETUP key is also
included.
These fold out diagrams are numbered to correlate with the associated key position as follows:-
(1.0) HELP/SETUP
(2.0) Tx TEST
(3.0) Rx TEST
(4.0) Dx TEST
(5.0) SYSTEM
(6.0) SPEC ANA
(7.0) AF TEST
References in the manual to specific screens on the fold out diagrams is given as in the following
example:-
Fold out diagram (2-2-3). This is the screen shown after pressing the [Tx TEST] mode key, then
the [Tx Power] key (second key down), followed by the [Harmonic analysis] key (third key
down). Where there are keys on both sides of a screen, keys 1 to 6 are on the left, keys 7 to 12 on
the right.