HP 8590 E-Series User Manual page 200

measures the power leakage into the adjacent channels and calculates the
ADJ CHAN
adjacent channel power ratio of both the upper and lower channels, with
PWR extd
respect to the reference channel. ADJ CHAN POWER extd has an extended
dynamic range compared with ADJ CHAN POWER. The extended range is
measured by taking two different sweeps with different reference levels
combining the trace data. The displayed dynamic range is 104 dB and the log
scale is set to 13 dB/ division.
The total power of the channel is displayed. The adjacent channel power ratios
of both channels are also displayed and the larger number is marked with a
(Vertical lines on the display indicate the six edges of the upper, lower, and
reference channels being measured.)
The measurement stops and the spectrum analyzer is returned to its prior state
when other measurement functions are activated.
The center frequency must be set to the intended carrier frequency and the
reference level set to optimize the displayed signal. The channel bandwidth
and channel spacing must be entered by the user. If PARAM AUTO is selected
(so AUTO is underlined), other spectrum analyzer settings will then be coupled
and set automatically. The adjacent channel power measurement is an rms
measurement. This means that the measurement of the total channel power
and the adjacent channel power ratios are accurately reported, whether the
transmitted signal contains tones, noise, or both. IF PARAM AUTO is selected
the parameters of the instrument state are set for a valid measurement. When
using PARAM MAN, the following conditions must be maintained to make a
valid rms measurement:
Video bandwidth is at least 10 times the resolution bandwidth.
n
detector mode.)
Resolution bandwidth is less than or equal to 100 kHz.
n
Video averaging is OFF.
n
Front-Panel Key Access: (j-1
HP 8593E, HP 8594E, HP 8595E, or HP 8596E with Option 010 only.
ALC
activates internal (INT) leveling or external (EXT) leveling.
INT EXT
Front-Panel Key Access: l$GGZQ
HP 85901, or HP 8591E with Option 010 or 011 only.
ALC MTR
activates the automatic leveling control (ALC) function for internal (INT)
INT XTAL
leveling or external (XTAL or MTR) leveling. The external leveling input
(located on the rear panel of the spectrum analyzer) can be used with a
power meter or crystal that has a positive or negative voltage output. See
specifications and characteristics in your calibration guide for the leveling
input characteristics. External leveling increases the amplitude accuracy by
improving the effective source match. The meter (MTR) position narrows ALC
loop bandwidth so an HP power meter can be used.
Front-Panel Key Access: (puxm]
and
.
A
Key Descriptions 7-7