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1-6 General Information
HP 85685A RF
The HP 85685A RF Preselector can be used
Preselector
with an HP 8568B to form a multi-purpose RF
test receiver. It improves spectrum analyzer
measurement sensitivity while providing
overload protection from out-of-band signals.
This enables low-level signals to be monitored
in the presence of high-level ambients. Its
frequency range is 20 Hz to 2 GHz.
Troubleshooting and
Service information for the HP 8568B is
available in the HP 85680B Troubleshooting
Repair Manual
and &pair Manual and the HP 85662A
Troubleshooting and &pair Manual.
They include schematic diagrams, block
diagrams, component location illustrations,
circuit descriptions, repair procedures, and
troubleshooting information.
Service Kits
A service kit is available containing
troubleshooting and alignment accessories
for the HP 8568B. The kit includes a test
cable and extender boards. Order the kit as
HP part number 08568-60001. A combined
kit, HP part number 08566-60005 is available
containing accessories for both the HP 8566B
and HP 8568B instruments.
Several options are available and can be ordered by option number
when you order the instrument. Some of the options are also
available as kits that can be ordered and installed after you have
received your HP 8568B.
Option 001
75 ohm (BNC) RF input.
Option 010
Rack Mount Slide kit. This option supplies the
necessary hardware and installation instructions for
mounting an instrument on slides into a rack of 482.6
mm (19 inch) spacing. The heavy-duty slides are
designed specifically to support the weight of the
HP 8568B. Because of the weight of the HP 8568B,
approximately 50 kg (112 lbs), the use of this option
is recommended. Option 010 is also available as a kit
(HP part number 5062-6407).
Option 080
Information Cards in Japanese.
Information Cards in French.
Option 081
Option 400
The standard HP 8568B requires that the power line
frequency be 50 or 60 Hz. Option 400 allows the
instrument to operate with a 400 Hz power line
frequency.
Option 462
This option provides 6 dB bandwidths for making
MIL-STD EM1 measurements. In addition to
enhancing instrument capability for MIL-STD
461D and 462D EM1 measurements, Option 462
spectrum analyzers can still make all commercial
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