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16 Chapter 1
Signal Generator Overview
Front Panel Display
EXT REF This annunciator appears when an external frequency reference is applied.
FM This annunciator (Option UNT only) appears when frequency modulation is turned
on. If phase modulation is turned on, the ΦM annunciator will replace FM.
I/Q This annunciator (E8267D only) appears when I/Q modulation is turned on.
L This annunciator appears when the signal generator is in listener mode and is
receiving information or commands over the RS-232, GPIB, or VXI-11 LAN
interface.
MOD ON/OFF This annunciator (E8267D and E8257D with Options UNT, UNU, or UNW only)
indicates whether active modulation formats have been enabled or disabled.
Pressing the
Mod On/Off hardkey enables or disables all active modulation formats
(AM, FM, ΦM, Pulse, or I/Q) that are applied to the output carrier signal available
through the RF OUTPUT connector. The
Mod On/Off hardkey does not set up or
activate an AM, FM, ΦM, Pulse, or I/Q format; each individual modulation format
must still be set up and activated (for example,
AM > AM On) or nothing will be
applied to the output carrier signal when the
Mod On/Off hardkey is enabled.
OVEN COLD This annunciator (Option UNR/UNX only) appears when the temperature of the
internal oven reference oscillator has dropped below an acceptable level. When
this annunciator is on, frequency accuracy is degraded. This condition should
occur for several minutes after the signal generator is first connected to line
power.
PULSE This annunciator (Options UNU or UNW only) appears when pulse modulation is
on.
R This annunciator appears when the signal generator is remotely controlled over
the GPIB, RS-232, or VXI-11/Sockets LAN interface (TELNET operation does not
activate the R annunciator). When the R annunciator is on, the front panel keys
are disabled, except for the Local key and the line power switch. For information
on remote operation, refer to the Programming Guide.
RF ON/OFF This annunciator indicates when the RF or microwave signal is present (RF ON) or
not present (RF OFF) at the RF OUTPUT. Either condition of this annunciator is
always visible in the display.
S This annunciator appears when the signal generator has generated a service
request (SRQ) over the RS-232, GPIB, or VXI-11 LAN interface.
SWEEP This annunciator appears when the signal generator is in list, step, or ramp sweep
mode (ramp sweep is available with Option 007 only). List mode is when the
signal generator can jump from point to point in a list (hop list); the list is
traversed in ascending or descending order. The list can be a frequency list, a
power level list, or both. Step mode is when a start, stop, and step value
(frequency or power level) are defined and the signal generator produces signals
that start at the start value and increment by the step value until it reaches the
stop value. Ramp sweep mode (Option 007 only) is when a start and stop value
(frequency or power level) are defined and the signal generator produces signals
that start at the start value and produce a continuous output until it reaches the
stop value.
T This annunciator appears when the signal generator is in talker mode and is
transmitting information over the GPIB, RS-232, or VXI-11 LAN interface.