Rohde & Schwarz ZVB 14, Service Manual

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R&S ZVB Manual Alignment and Recording Correction Values
1145.1078.82 2.7 E-4
Writing data to the hard disk:
Change to computer application
Select path
C:\Documents and Settings\AllUsers\ApplicationData\Rohde&Schwarz\NWA\data\eeprom\
FR\config.ini
Transform data format to decimal
Write decimal data to [ TUNE ] 128_PRETUNE = … (without option ZVAB-B4)
OCXO_TUNE = … (with option ZVAB-B4)
Writing to Eprom:
Select Service Level 2 (see Service Functions)
Set Service Function 3.9.0.2
Aligning the DC Inputs
At the outset, ensure that the correction parameters "Multiplier" M and "Offset" F have been preset to
M=1 and F=0 for both inputs. This can be done using the Service Functions 3.1.2.5 and 3.1.2.2 which
are described below under
Service Functions .
Test equipment: Power supply 2 x 0 to 10 V
DC meter (R&S URE)
Test setup: DC Meas ± 1 V
Connect DC voltage
+ 1 V…………pin 6, pin 3 (Gnd)
- 1 V…………pin 8, pin 5 (Gnd)
DC Meas ± 10 V
Connect DC voltage:
+ 10 V…………pin 6, pin 3 (Gnd)
- 10 V…………pin 8, pin 5 (Gnd)
Check voltages with the R&S URE and correct if necessary.
ZVB settings:
Measure : DC Inputs : DC Meas ± 1V Measure : DC Inputs: DC Meas ± 10V
Measurement Read off the voltages displayed by the R&S ZVB:
V1 = positive voltage
V2 = negative voltage
Calculating the corrections:
M -> scaling factor
F -> offset
M = (V1-V2)/2
F = (V1+V2)/(V1-V2)
M = (V1-V2)/20
F = 10x (V1+V2)/(V1-V2)
Pin assignment for DC MEAS connector