E4990A Help
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information shown on the LCD screen of the main body can be displayed
on an external color monitor.
Connector type: 15-pin VGA connector, female
External Trigger (EXT TRIG)
Input
A connector to which external trigger signals are input. This connector
detects the downward transition from the HIGH state in TTL signals as the
trigger signal. To use this connector to generate a trigger, you must set
the trigger source to the "external" side. The connector type is BNC,
female.
GPIB Port
The connection of an external controller through General Purpose Interface
Bus (GPIB) connector allows you to configure an automatic measurement
system.
This GPIB port is used only for controlling the E4990A from an external
controller. Use USB/GPIB interface to control other devices from the
E4990A. You cannot control other devices from the E4990A through this
GPIB port.
Solid State Drive (SSD)
Built in solid state drive.
Reference Signal Ports (10MHz)
The specification for the signals is specified in the data sheet.
Input (REF IN)
The reference signal input connector is used for phase-locking the
measurement signal from the E4990A to the external frequency reference
signal. Inputting reference signal to this connector improves the accuracy
and frequency stability of the measurement signal from the E4990A. When
the frequency reference signal is input to this connector, the measurement
signal from the E4990A is automatically phase-locked to the reference
signal. When an input signal is not present, the frequency reference signal
inside the E4990A is automatically used. The ExtRef on the instrument
status bar is displayed in blue when the system is phase-locked to the
external reference signal and in gray when not phase-locked.
When using Option 1E5 (high stability time base), connect this connector
to the REF OVEN by using the BNC(m)-BNC(m) cable included with the
option.
Output (REF OUT)
A connector for outputting the internal frequency reference signal from the
E4990A. By connecting this output connector to the external reference
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