HP 8591C User Manual

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System Measurements
Making System Measurements
16:31:83 DEC 86, 1993
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REF 37.5 dBmV hT 10 dB
ml!
ST0 AIR
m HRCT
USR CH 0
CNTR FRO
USR CH 9
SPAN
CENTER 57.888
NHz
RES SW 38 kHz
Pf-RV
MQflU
SPAN 6.888 MHz
UBW 38 kHz
SWP 20.0 msec RT
Figure 3-1. Channel Tuning Menu
4. Fbr spectrum analyzers with a 50 D input: Use an external 50 61 to
75 61 matching pad/de block to compensate for the impedance mismatch
between a 75 62 impedance system and the spectrum analyzer’s 50 hl input
impedance. If you use an HP 11981A external pad, the external pad
causes approximately 5.8 dB of amplitude loss. The external pad function
(EXT PAD YES NO ) can be used to compensate for this amplitude loss.
l Connect the matching pad to the spectrum analyzer input.
l Press Analyzer Input EXT PAD YES NO to underline YES.
l Press Prev Menu to return to the Setup menu.
If you are using a spectrum analyzer with 50
Q input impedance but are
not using an external matching pad/de block, the analyzer will compensate
for most of the impedance mismatch, but amplitude measurements can
have up to
4~0.2 dB additional error caused by the uncompensated
mismatch over the frequency range.
CAUTION
dc voltages in excess of 25 V and ac power-line voltages in excess of
100 Vpeak can permanently damage the analyzer input.
3-5

HP 8591C Specifications

General

Brand	HP
Model	8591C
Category	Measuring Instruments
Language	English