R&S SM300 - Page 74

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Manual Test Procedure R&S SM300

Version 04 74

Service Manual SM300: 1147.1652.00 Instrument Part No SM300: 1147.1498.03

Measurement

 Read the level on the test receiver or analyzer and note down as a

reference value. It should be ideally 10 dBm minus 125 dB attenuation

equal to -115 dBm. Select measurement bandwidth of a small value to

obtain an accurate reading.

 The deviation from the reference value shown on analyzer display is the

level error.

Measurement at levels < -115 dBm

Caution

A prerequisite for correct measurements is that the components used are

completely RF-shielded

Test setup

Switch a low-noise preamplifier between SM300 and precision attenuator.

Measurement

 Perform a calibration at a measured level.

 It is thus possible to measure levels down to the lower limit of SM300

Level on SM300 Attenuation of attenuator

Reference level 125 dB

Reference level -5 dB 120 dB

Reference level -10 dB 115 dB

Reference level -20 dB 105 dB

Reference level -40 dB 85 dB

Reference level -60 dB 65 dB

Reference level -80 dB 45 dB

Reference level -100 dB 25 dB

Reference level -120 dB 5 dB

Reference level -125 dB 0 dB

Table 2-2: Test level 2 Level accuracy

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