HP 8591C User Manual

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System Measurements
Making System Measurements
Step 2. Connect the signal to the analyzer
CAUTION
To prevent the analyzer input from being damaged, the total power at the
analyzer input must be less than +72 dBmV.
To prevent the analyzer input mixer from being overloaded, the total
power at the analyzer input mixer must be less than
+37 dBmV, except
for CSO/CTB for which +27 dBmv is the maximum total power input
to the mixer. For systems with unequal carrier levels (system tilt), the
total power must be calculated by summing the individual carriers. The
TOTL PWR (8 INPUT softkey function accounts for system tilt.
You can measure the input power by pressing Setup , Analyzer Input ,
TOTL PWR (8 INPUT The total power is displayed at the bottom of the
screen.
Total power at the input mixer can be reduced by increasing input
attenuation. Press (-1 ATTEN , and make the adjustment. The
analyzer retains a manually selected attenuation until you either select a new
value or reset the analyzer power-on default conditions.
For all tests provided by the HP 85721A personality, the analyzer
automatically selects the attenuator setting to meet the above requirements.
1. Use the necessary adapters to connect the cable TV signal to the analyzer
See Figure 3-3.
2. If your analyzer has Option 107 installed, you must use the coupler
(provided) and connect the cable TV signal to the TV IN and analyzer
input connectors as shown in Figure 3-4. Figure 3-4 shows the
connections for RF and video measurements.
3. If your analyzer has Option 107 installed, ensure that the rear-panel
TV TRIG OUT is connected to GATE IN as shown in Chapter 1.
3-8

HP 8591C Specifications

General

Brand	HP
Model	8591C
Category	Measuring Instruments
Language	English