Giga-tronics GT 9000, Operation & Maintenance Manual

Page: 211 / 238

the operation of the high power option is incompatible with low power settings. If the option
has been selected, and a power level of less than +8 dBm is requested, the option will be
disabled, and will not activate itself until a level setting is changed to +8 dBm or greater.
During a digital power sweep across 8 dBm, the high power option is activated or deactivated
(as needed) when the power level crosses 8 dBm.
During an analog power sweep across 8 dBm, the high power option remains in its initial state
during the entire sweep. An analog power sweep which begins below 8 dBm will have the
high-power option deactivated during the entire sweep; an analog power sweep which begins at
or above 8 dBm will have the high power option activated during the entire sweep. Analog
power sweeping from at or above 8 dBm to below 8 dBm is not recommended; the high power
option was not designed for operation below 8 dBm.
A.9.4 High Power Indications
Because the high power option can activate or deactivate itself in some situations, without a
direct request from the user, the front panel is set up to warn the user when the option is active
and when it is not. The decimal point in the power display window flashes when the high power
option is active, and ceases to flash when the option is deactivated. If the instrument’s RF
output power is turned off while the option is selected, a flashing decimal in the power display
window warns that the instrument will be in high power mode when RF is turned back on. In
maximum power mode with the option selected, the power window displays ——-. with the
decimal point blinking.
If the instrument is turned off while the high power option is selected, and then turned back on,
the instrument will wake up with the RF power turned off, and the message HIGH POWER ON
/ LEVEL = n.nn dBm displayed in the entry menu window to warn that the instrument will be
in high power mode when RF is turned back on. The power level shown will be the current CW
power level or, for a power sweep, the maximum power of the sweep.
A.9.5 Specification Changes for Option 20
Maximum Leveled
Output Power
(with option inactive): Maximum output power is reduced by 1.5 dB from the standard specification.
Maximum Leveled
Output Power
(with option active): (Option 20A): .01-20 = +20 dBm (-4 dBm min w/o atten, -60 dBm min w/atten)
(Option 20B); .01-20 = +22 dBm (-4 dBm min w/o atten, -60 dBm min w/atten)
Output Flatness
(with option active):
±
2.5 dB (not specified in Analog Frequency Sweep mode)
Harmonics
(with option active): (Option 20A): .01-20 = >5 dBc; .5-20 = >20 dBc
(Option 20B): .01-20 = >20 dBc; .5-20 = >20 dBc
Pulse On/Off Ratio
(with option active): >60 dB
AM Performance
(with option active): Not specified (however, AM is functional).
Options
Manual No. 120AM00250, Rev C, September 1998
A-5