R&S ZVB Instrument Construction and Function Description
1145.1078.82 3.47 E-4
Replacing a Reflectometer RM20 A510 to 540
(See Chapter 5, Spare Parts List, Items 180, 185, 190 and drawings 1145.1010, 1302.4425)
The boards are located under the motherboard.
Opening the instrument and removing the board
Turn off the instrument and disconnect from the mains, screw off the 4 rear-panel feet (460) and
pull off the enclosure (400) backwards.
Remove the bottom instrument cover (297) after undoing the 12 countersunk screws (299).
Disconnect the 3 cables to the coupler, the LO cable, the two IF cables and the 50-pin control cable
from the reflectometer (in case of Mod. 22 this is also necessary for the second reflectometer of the
associated 2RM unit).
R&S ZVB14, mod. 14 and 19, R&S ZVB20, mod. 20 and 25: Remove the screws (232) and take off
the cover (230).
R&S ZVB14, R&S ZVB17, R&S ZVB20, mod. 20, 21, and 23, R&S ZVB14 mod 19 (port3 and4),
R&S ZVB20, mod. 25 (port3 and4): Remove the screws (210, 215 or 246, 248)) and take out the
reflectometer.
R&S ZVB20 mod. 22: Remove the screws (210), take out the complete 2RM unit and remove the
screws (90).
R&S ZVB14 mod. 19 (port1 and 2), R&S ZVB20 mod. 25 (port1 and 2): Remove the reflectometer
for port1 (port2).
Then remove the screws (210) and take out the reflectometer.
Installing the board and reassembling the instrument
Insert the new reflectometer into the instrument by reversing the removal procedure and reconnect
any cables that have been disconnected
Fit the instrument base cover (297) and secure with 12 countersunk screws (299).
Slide the enclosure (400) back on and screw the 4 rear-panel feet (460) into position.
Connect the mains cable and turn on at the mains switch. The instrument is now in the standby
mode
Select Service Level 2 (see Service Functions).
When the instrument has been started, check the protocol file for errors:
[ INFO : Error Log ]
Record the generator and receiver correction data (see Recording Correction Values).
Perform the factory system error calibration (see Factory System Error Calibration).
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