CMU Manual Adjustment
1100.4903.82 2.1 E-4
2 Adjustment
The following chapter describes the manual adjustment of the reference sources as well as the
software-controlled adjustment of individual module data following module replacement (automatic
adjustment of module data).
The manual adjustment of the +5 VDC reference source which provides the highly stable DC reference
voltage for the individual CMU modules as well as that of the 10 MHz reference frequency source which
determines the frequency accuracy of the CMU are described. The adjustment permits to maintain and
restore the data integrity of the instrument.
Manual adjustments must be performed at an ambient temperature between +23°C and +30°C after the
instrument has warmed up.
After the software-controlled adjustment has been performed, the CMU is ready for use and offers full
data integrity except for the level accuracy. In order to attain the level accuracy specified in the data
sheet, it is necessary to record the path error data. To this end, the CMU must be tested using the test
system ACS 100 (see chapter 1, Performance Test).
Manual Adjustment
In the following, the measuring instruments and auxiliary means required for the manual adjustment of
the CMU, the appropriate preparations of the instrument as well as the individual adjustments will be
explained.
Measuring Instruments and Auxiliary Equipment
Table 2-1 Measuring instruments and auxiliary equipment for manual adjustment of the CMU
Item Type of
instrument
Required
characteristics
Appropriate device R & S order
number
Use
page
1 Voltmeter DC measurement URE3 350.5315.03
2 Spectrum analyzer
with
frequency counter
Frequency measure-
ment up to 1 GHz
FSE 1066.3010.20
(30)
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