R&S ZVA24, Руководство по обслуживанию

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R&S ZVA Repairs
1177.5333.02 3.63 E-11
Replacing a Reflectometer RM24 A510 to 540
(See Chapter 5, Spare Parts List, Items 180, 190, 200 and drawings 1145.1110, 1145.4283)
Opening the instrument and removing the board
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Turn off the instrument and disconnect from the mains, screw off the 4 rear-panel feet (460) and
pull off the enclosure (400) backwards.
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Remove the bottom instrument cover (297) after undoing the 12 countersunk screws (299).
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Remove 3.5mm connection cables (only with option ZVA24-B16)
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Disconnect the three cables to the coupler, the LO cable, the two IF cables and the 50-pin control
cable from the reflectometer.

Loosen the captive screws (see 1145.1110.01 sheet 4 / 5) and take out the reflectometer.
Installing the board and reassembling the instrument

Insert the new board into the instrument.
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Screw in the captive screws.
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Reconnect any cables that have been disconnected.
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Fit the 3.5mm connection cables (only with option ZVA24-B16).
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Fit the instrument base cover (297) and secure with screws (299).
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Slide the enclosure (400) back on and screw the 4 rear-panel feet (460) into position.
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Connect the mains cable, turn on at the mains switch and press the ON key.

Select Service Level 2 (see Service Functions).
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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 ).