Filter
Top Products
Chapter 1 15
Signal Generator Overview
Front Panel Display
MOD ON/OFF This annunciator (E8257C and E8267C only) which is always present on the display,
indicates whether active modulation formats have been enabled or disabled with the
Mod On/Off hardkey. 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 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 only if the signal generator
is disconnected from line power.
PULSE This annunciator (E8257C and E8267C 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 and microwave signal is present (RF ON) at the
RF OUTPUT, or if the RF and microwave signal is 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.
UNLEVEL This annunciator appears when the signal generator is unable to maintain the correct
output level. The UNLEVEL annunciator is not necessarily an indication of instrument
failure. Unleveled conditions can occur during normal operation. A second annunciator,
ALC OFF, will appear in the same position when the ALC circuit is disabled.