26 Chapter 2
Front and Rear Panel Features
Front Panel Overview
The Numeric Keypad allows entry of exact values for many of the analyzer
functions. You may include a decimal point in the number portion. If not, the
decimal point is placed at the end of the number.
Numeric entries must be terminated with a units key. When a numeric entry is
begun, the menu keys show the units key labels. The units keys change
depending on what the active function is. For example, the units keys for
frequency span are
GHz, MHz, kHz, and Hz, whereas the units for reference
level are
+dBm, dBm, mV, V, and A.
NOTE If an entry from the numeric keypad does not coincide with an allowed function
value (for example, that of a 12 MHz bandwidth), the analyzer defaults to the
nearest allowable value.
The Step Keys () increase or decrease the active function value. The step
size depends upon the current analyzer measurement. Each press results in a
single step change. For those parameters with fixed values (resolution
bandwidth), the next value in a sequence is selected each time a step key is
pressed. Step size is predictable (e.g., 10% of span for center frequency) and can
be set for some functions (i.e., center frequency). Out-of-range values or
out-of-sequence values will not occur using these keys.
11 VOLUME. The VOLUME knob adjusts the volume of the internal speaker. The
speaker is turned on and off with the
Speaker On Off key in the Det/Demod menu.
12 EXT KEYBOARD. The EXT KEYBOARD connector is a 6-pin mini-DIN connector.
The keyboard can be used to enter screen titles and filenames.
NOTE To avoid damage to the analyzer, always turn off power before plugging a
keyboard into the analyzer.
13 PROBE POWER provides power for high-impedance ac probes or other
accessories. (+15 V, 12.6 V, 150 mA maximum)
14 LO OUTPUT provides the proper local oscillator signal for use with external mixers
(Option AYZ).
15 IF INPUT connects to the IF OUTPUT of the external mixer (Option AYZ).
16 Return. The Return key accesses the previously selected menu. Continuing to
press
Return accesses earlier menus. Return also terminates entry of alpha numeric
functions (e.g., Title).
17 AMPTD REF OUT provides an amplitude reference signal of 50 MHz at –20 dBm.
Agilent ESA models E4402B, E4403B, E4404B, E4405B, E4407B, and E4408B
only.
18 Tab Keys are used to move around in the Limit editor, the Correction editor and
similar table-driven forms.
19 INPUT 50 (INPUT 75 for Option 1DP) is the signal input for the analyzer.
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