HP 8591C User Manual

System Measurements
Making System Measurements
5. Fix- using an external ampli$er @weamp): An external amplifier may be
required for the carrier-to-noise test. See Chapter 8 for more information
about when a preamplifier is required for the carrier-to-noise test. The
carrier-to-noise test calculates the noise contribution of the external
amplifier and reports that correction on the MORE INFO screen of the
carrier-to-noise test.
l Connect the output of the external amplifier to the analyzer input (or
input of coupler).
l Connect the cable TV signal to the input of the external amplifier.
l Press Analyzer Input EXT AMP YES NO to underline YES.
l Press EXT AMP GAIN then enter the gain value of the external
amplifier. The default value is 20 dB for the HP 85905A preampliEer.
l Press EXT AMP NZ FIG then enter the noise figure value of the
external amplifier. The default value is 7 dB for the HP 85905A
preamplifier.
l Press Prev Menu to return to the Setup menu.
The TOTL PWR Q INPUT function measures the total RF power into the
analyzer. Use this function to externally adjust the total power into the
analyzer or preamplifier for optimization of measurement dynamic range.
16:32:15 DEC 86, 1993
EXT RMP
NZ FIG
TOTL PWR
@ INPUT
I
CENTER 57.888 MHz
RI
:S BW 30 kHz
I
Meflu
SPAN fi.RBB RHz
0.8 "set RT
UBW 38 kHz SWP 21
Figure 3-2. Analyzer Input Configuration Menu
3-6

HP 8591C Specifications

General

Brand	HP
Model	8591C
Category	Measuring Instruments
Language	English