R&S ZVA8 - Aligning the DC Inputs

R&S ZVA Alignment
1177.5333.02 2.5 E-11
Writing data to the hard disk:
 Change to computer application
Note: Do not terminate the NWA 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 (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 URE and correct if necessary.
ZVA settings:
Measure : DC Inputs : DC Meas ± 1V
Measure : DC Inputs: DC Meas ± 10V
Measurement
Read off the voltages displayed by the ZVA:
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