Coh Carrier (Serial Prefixes >=Us4646/My4646); Ghz Ref Out (Serial Prefixes >=Us4646/My4646); Q-Bar Out; Ac Power Receptacle - Keysight E8357D User Manual

Signal Generator Overview
Rear Panel
compensates for this. However, for wideband external I/Q inputs (Option 016) there is no compensation and the I and Q
inputs at the rear panel must be reversed to maintain the correct phase relationships in this frequency band. Refer to the
Data Sheet and to the A37 Upconverter description in the Keysight PSG Signal Generators Service Guide for more
information.
For instruments with Option 015 (discontinued), single–ended wideband I/Q, there is a single BNC Q input. The
recommended power level at this input connector is 0 dBM.
12. COH CARRIER (Serial Prefixes >=US4646/MY4646)
This female SMA connector (Option UNT only) outputs an RF signal that is phase coherent with the signal generator
carrier. The coherent carrier connector outputs RF that is not modulated with AM, pulse, or I/Q modulation, but is
modulated with FM or ΦM (when FM or ΦM are on).
The output power is nominally 0 dBm. The output frequency range is from 249.99900001 MHz to 3.2 GHz; this output
is not useful for output frequencies > 3.2 GHz. If the RF output frequency is below 249.99900001 MHz, the coherent
carrier output signal will have the following frequency:
Frequency of coherent carrier = (1E9 − Frequency of RF output) in Hz.
Damage levels are 20 Vdc and 13 dBm reverse RF power. The nominal output impedance of this connector is 50 ohms.
13. 1 GHz REF OUT (Serial Prefixes >=US4646/MY4646)
This female SMA connector (Option UNX only) provides a 1 GHz output that is 100 times the frequency of the internal
or external 10 MHz reference. The nominal output level is 7 dBM. The nominal output impedance is 50 ohms. When not
in use, this connector must be terminated with a 50 ohm load.
14. Q–bar OUT
This female BNC connector (E8267D only) can be used with an internal baseband generator (Option 601/602) to output
the complement of the analog, quadrature–phase component of I/Q modulation. On signal generators without Option
601/602, this female BNC connector can be used to output the complement of the quadrature–phase component of an
external I/Q modulation that has been fed into the Q input connector.
Q–bar OUT is used in conjunction with Q OUT to provide a balanced baseband stimulus. Balanced signals are signals
present in two separate conductors that are symmetrical relative to ground and are opposite in polarity (180 degrees out
of phase). The nominal output impedance of the Q–bar OUT connector is 50 ohms, dc–coupled.

15. AC Power Receptacle

The ac line voltage is connected here. The power cord receptacle accepts a three–pronged power cable that is shipped
with the signal generator.
CAUTION Always use the three-prong AC power cord supplied with this product. Failure to ensure adequate earth
grounding by not using this cord can cause product damage.
This instrument has auto-ranging line voltage input; be sure the supply voltage is within the specified
range and voltage fluctuations do not to exceed 10 percent of the nominal supply voltage:
E8257D: 100/120 VAC 50/60/400 Hz, 220/240, VAC 50/60 Hz, < 250 W typical, 450 W maximum
E8267D: 100/120 VAC 50/60/400 Hz; or 220/240 VAC 50/60 Hz, (automatically selected); < 400 W
28 Keysight PSG Signal Generators User's Guide