Maintenance And Troubleshooting - R&S EB200 Manual

EB200 Manual

Maintenance and Troubleshooting

5 Maintenance and Troubleshooting
5.1 Maintenance
5.1.1 Alignment of the 10-MHz reference oscillator crystal in the IF section
In order to ensure accurate receiver frequencies the internal 10-MHz-reference oscillator crystal must
be trimmed every year.
⇒ Remove the covers.
At the left side there is a sheet metal with square holes in it. In that sheet metal there is an 8-mm hole.
Behind that hole there is the trimmer (part of EB200Z1) for the frequency of the reference oscillator.
A 1.5-mm screwdriver for cheese head screws is required.
⇒ Connect a frequency counter with a tolerance ≤ 1 × 10
-8
to X4 REF EXT/INT at the rear panel.
⇒ Start the internal reference.
⇒ Trim the frequency to 10 MHz ± 0.5 Hz at room temperature.
5.1.2 Re-establishing the original state, coldstart
A coldstart can be carried out be resetting the unit. All device settings (parameters, memory locations
and UDP configuration) will thus be reset to the original state (factory setting). This may become
necessary after a firmware update when certain versions are changed. A reset is made on the
switched-on unit by briefly connecting connector X8, pin 31 on the rear panel to ground (eg by using a
pair of tweezers).
5.1.3 Firmware Update
If a module is exchanged, a firmware update might be required.
In that case a diskette carrying the current firmware will be shipped together with the new module.
On the diskette there are also the "Release Notes" with instructions for the firmware installation.
The "Release Notes" describe also the changes for this specific option.
The firmware can also be downloaded via the following Internet address:
http://www.rohde-schwarz.com
4052.2000.02 5.1 E-7