Rohde & Schwarz CMU200 - Ref out 1

CMU Manual Test Procedure
1100.4903.82 1.9 E–4
Preparation:
½ Feed in at REF IN: 1 MHz sinewave, 0.5 V(rms).
½ Connect frequency counter to RF3 OUT.
Control: ½ Set CMU to external reference 1 MHz, RF 1 GHz.
Test: ½ Use frequency counter to measure frequency deviation from 1 GHz.
Preparation:
½ Feed in at REF IN: 10.000 050 MHz sinewave, 1.4 V(rms).
½ Connect frequency counter to RF3 OUT.
Control: ½ Set CMU to external reference 10 MHz, RF 1 GHz.
Test: ½ Use frequency counter to measure frequency deviation from 1.000 005 000 GHz.
Preparation:
½ Feed in at REF IN: 9.999 950 MHz sinewave, 1.4 V(rms).
½ Connect frequency counter to RF3 OUT.
Control: ½ Set CMU to external reference 10 MHz, RF 1 GHz.
Test: ½ Use frequency counter to measure frequency deviation from 0.999 995 GHz.
REF OUT 1
The level and frequency are checked.
Int. 10 MHz:
½ Set CMU to internal reference.
½ Measure at REF OUT 1: 10 MHz, level > 1.4 V(pp).
REF IN
signal:
½ Set CMU to external reference.
½ Feed in at REF IN: 52 MHz TTL, (as an alternative +16 dBm from signal)
½ Measure at REF OUT 1: 52 MHz, level > 1.4 V(pp).
½ Measure at REF OUT 1: frequency 52 MHz ± 1 Hz
½ Feed in at REF IN: 1 MHz TTL, (as an alternative +16 dBm from signal
generator).
½ Measure at REF OUT 1: 1 MHz, level > 0.5 V(rms) (1.4 V(pp)).
½ Measure at REF OUT 1: frequency 1 MHz ± 1 Hz.
REF OUT 2
The level and frequency are checked. The CMU and the frequency counter must be synchronized (test
setup REF2).
REF OUT 2
signal 13 MHz:
½ Set CMU to external reference.
½ Feed in at REF IN: 10 MHz sinewave, 0.5 V(rms).
½ Set CMU to REF OUT 2 13 MHz or 10 MHz (depending on SW; menu
Connection Control/Synch.).
½ Measure at REF OUT 2: 13 MHz or 10 MHz, level > 1.0 V(pp).
½ Measure at REF OUT 2: frequency 13 MHz or 10 MHz ± 1 Hz.