Service Modes More Menu - Agilent Technologies 8719ET Service Manual

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers

Service Modes More Menu

To access this menu, press
SAMPLR COR ON off
IF GAIN AUTO
IF GAIN ON
IF GAIN OFF
STORE EEPR on OFF
Service Guide
SERVICE MENU
System
is used to turn the sampler correction on and off. In the off
mode, the actual frequency response of the receiver is
displayed. In the on mode, the corrections are applied to
the frequency response.
is used for normal operating conditions and works in
conjunction with IF GAIN ON and OFF. The A10 assembly
includes a switchable attenuator section and an amplifier
that amplifies low-level 4 kHz IF signals (for A and B
inputs only). This mode allows the A10 IF section to
automatically determine if the attenuator should be
switched in or out. The switch occurs when the A or B
input signal is approximately −30 dBm.
locks out the A10 IF attenuator sections for checking the
A10 IF gain amplifier circuits, regardless of the amplitude
of the A or B IF signal. Turning this ON switches out both
the A and B attenuation circuits; they cannot be switched
independently. Be aware that input signal levels above
−30 dBm at the sampler input will saturate the ADC and
cause measurement errors.
switches in both of the A10 IF attenuators for checking the
A10 IF gain amplifier circuits. Small input signals will
appear noisy, and raise the apparent noise floor of the
instrument.
allows you to store the correction constants that reside in
non-volatile memory (EEPROM) onto a disk. Correction
constants improve instrument performance by
compensating for specific operating variations due to
hardware limitations (refer to
and Correction Constants.") Having this information on
disk is useful as a backup, in case the constants are lost
(due to a CPU board failure). Without a disk backup, the
correction constants can be regenerated manually,
although the procedures will take longer.
Service Key Menus and Error Messages
Service Menu - Service Features
SERVICE MODES MORE
Chapter 3 , "Adjustments
.
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