Rohde & Schwarz 1138.4000, Service Manual

Page: 26 / 213

Tolerance Analysis Radio Unit R&S CRTU-RU
1140.0050.82 1.6 E-4
RX Demodulation Measurements
Test setup RX4:
DUT
(CRTU)
GEN
10 MHz Reference Freq.
RF4IN
RX4
Demodulator
(FSE with
FSE-B7 or
FSIQ)
10 MHz Reference Freq.
IF3RX CH1
Fig. 1-6 Test setups for RX demodulation measurements
Tolerance Analysis
Due to the small measurement uncertainty of the CRTU Radio Unit, the measuring equipment must
meet stringent requirements. Since the measurement uncertainty of the measuring equipment to be
achieved depends on the test setup used, it is recommended to perform a tolerance analysis.
To be able to trace back errors in the measurement, the measurement uncertainty should also be
indicated in the test report.
The tolerances given in the test report refer to the values specified in the data sheet, i.e. the
measurement uncertainties of the test setup used are to be taken into account as well.
Unless otherwise specified, the specified tolerances are always to be observed.
Note: Please take into account the ETSI Technical Report ETR 028. This document can be found
on the GLORIS web site “https://gloris.rohde-schwarz.com” in the “Hints & Tricks” database
/ type CRTU.
The given tolerances refer to CRTU-G data sheet; PD 757.6056.2x.