Rohde & Schwarz SME02 - Calibration (CALIB)

Utilities SME
1038.6002.02 2.158 E-13
2.11.8 Calibration (CALIB)
For servicing, the following menus offer access to calibrating routines and correction values:
UTILITIES - CALIB - VCO SUM
LEV PRESET
PULSE GEN
REF OSC (cf. service manual)
QPSK
LEVEL (cf. service manual)
Internal calibration routines LEV PRESET, VCO SUM, QPSK and PULSE GEN are protected by a
password. They can only be executed if the lock-out in the UTILITIES - PROTECT menu has been
unlocked. The password is PASSWORD LEVEL 1 = "123456".
Caution: Execute calibration routines only when the instrument has warmed up
Calibration routines LEVEL and REF OSC are described in the service manual (stock no.
1039.1856.24).
Calibration VCO SUM
To synchronize the summing loop, the frequency the oscillator generates must be so close to the rated
frequency that the phase control can lock in. This is effected by means of presetting values. The
presetting values are stored in a table and can be renewed using internal calibration routine VCO SUM.
The calibration routine needs only be executed after a data loss in the RAM or after an exchange of
modules.
Function: In a 10-MHz division scale, the VCOs are synchronized with the rated frequency and the
presetting voltage readjusted until the difference to the tuning voltage becomes minimal.
The value hence achieved is entered into the table. The routine takes approx. 10 seconds.
Menu selection: UTILITIES - CALIB - VCO SUM
FREQUENCY
LEVEL
MODULATION
DIGITAL MOD
LF OUTPUT
SWEEP
LIST
MEM SEQ
UTILITIES
HELP
SYSTEM
REF OSC
PHASE
PROTECT
CALIB
DIAG
TEST
MOD KEY
AUX I/O
BEEPER
INSTALL
VCO SUM
LEV PRESET
PULSE GEN
OSC REF
QPSK
LEVEL
FREQ
100. 000 000 0
MHz
LEVEL
- 30.0
dBm
CALIBRATE
VIEW
750.0 MHz
760.0 MHz
770.0 MHz
780.0 MHz
790.0 MHz
800.0 MHz
810.0 MHz
820.0 MHz
2
2
2
2
2
2
2
2
0001
0002
0003
0004
0005
0006
0007
0008
-22mV
-24mV
-25mV
-26mV
-27mV
-28mV
-29mV
-30mV
88
108
127
147
167
187
207
217
Fig. 2-69 Menu UTILITIES - CALIB - VCO SUM