Rf Coupling; Input Mixer (Option Ayz Only) - Agilent Technologies PSA Series User And Programming Manual

Instrument Functions: A - L
Input/Output

2.8.2 RF Coupling

Specifies alternating current (AC) or direct current (DC) coupling at the analyzer RF input
port. Selecting AC coupling switches in a blocking capacitor that blocks any DC voltage
present at the analyzer input. This decreases the input frequency range of the analyzer,
but prevents damage to the input circuitry of the analyzer if there is a DC voltage present
at the RF input.
In AC coupling mode, signals less than 20 MHz are not calibrated. You must switch to DC
coupling to see calibrated frequencies of less than 20 MHz. Note that the message
DC Coupled will be displayed on the analyzer when DC is selected.
Some amplitude specifications apply only when coupling is set to DC. Refer to the
appropriate amplitude specifications and characteristics for your analyzer.
When operating in DC coupled mode, ensure protection of the input mixer by
CAUTION
limiting the input level to within 200 mV of 0 Vdc. In AC or DC coupling, limit
the input RF power to +30 dBm..
Key Path:
Input/Output
Dependencies/
Couplings: In external mixing mode, input port and RF coupling selection are not
available. Not available on 40 GHz or 50 GHz analyzers.
State Saved: Saved in Instrument State
Factory Preset: AC
Remote Command:
:INPut:COUPling AC|DC
:INPut:COUPling?
Example:
INP:COUP DC

2.8.3 Input Mixer (Option AYZ only)

Selects either the internal mixer(s) or an external mm-wave mixer. When internal mixing
is selected you get normal spectrum analyzer operation and the rest of the external mixing
functions are unavailable. With external input mixer selected you can analyze high
frequency signals (higher than the spectrum analyzer maximum frequency) by using an
appropriate external mixer.
Key Path:
Input/Output
Annunciation/
Annotation: "Ext Mix" on top line, replacing the attenuator value
Dependencies/
Couplings: Not available when
152
is set to
Preamplifier On
.
Chapter 2