Chapter 2 115
Front-Panel Key Reference
Input/Output
Input/Output
Input Z Corr
50Ω 75Ω
Sets the input impedance for voltage-to-power conversions. The
impedance you select is for computational purposes only, since the
actual impedance is set by internal hardware to 50
Ω
(except for
Option 1DP). The default is 50
Ω
(75
Ω
with Option 1DP). Setting the
computational input impedance to 75
Ω
is useful when using a 75
Ω
to
50
Ω
adapter to measure a 75
Ω
device on an analyzer having a 50
Ω
input impedance.
Key Access:
Input/Output
Coupling
AC DC
Only available in Agilent models E4402B or E4407B with Option UKB,
and E4404B or E4405B. Specifies alternating current (ac) or direct
current (dc) coupling at the analyzer input. Selecting ac coupling blocks
any dc voltage at the analyzer input, but also decreases the frequency
range of the analyzer. Input coupling is set to ac by an instrument
preset (With
Preset Type set to Factory). Some amplitude specifications
apply only when coupling is set to dc. Refer to the appropriate
amplitude specifications and characteristics for your analyzer.
CAUTION When operating in dc coupled mode, ensure protection of the input
mixer by limiting the input level to 0 Vdc, +30 dBm.
Key Access:
Input/Output
Table 2-1 Selecting Input Coupling
ESA Model # AC
Frequency Range
DC
Frequency Range
E4402B with
Option UKB
100 kHz to 3 GHz 100 Hz to 3 GHz
E4404B 100 kHz to 6.7 GHz 9 kHz to 6.7 GHz
E4404B with
Option UKB
100 kHz to 6.7 GHz 100 Hz to 6.7 GHz
E4405B 100 kHz to 13.2 GHz 9 kHz to 13.2 GHz
E4405B with
Option UKB
100 kHz to 13.2 GHz 100 Hz to 13.2 GHz
E4407B with
Option UKB
10 MHz to 26.5 GHz 100 Hz to 26.5 GHz
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