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Manual Alignment and Recording Correction Values
R&S ZVB
1145.1078.82 2.6
E-1
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.
ZVB settings:
Measure :
DC Inputs : DC Meas ± 1V
Measure :
DC Inputs: DC Meas ± 10V
Measurement
Read off the voltages displayed by the 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
The values that have been obtained in this way are now written to the hard disk using the Service
Functions described below and then transferred to the EEprom of network controller1.
Example illustrating DC Meas 1 V:
When +1 V is applied, V 1 = 1.023 V is displayed by the ZVB; when -1 V is applied, V2 = -1.011 V is
displayed. The results of the calculation are M = 1.017 and F = 0.0059. The following entries are,
therefore, made:
¾
Select Service Level 2 (see Service Functions).
¾
Set Service Functions (Writing to the hard disk)
3.1.2.5.dc_meas_1V.DcMeasMultiplier.1.017
3.1.2.5.dc_meas_1V.DcMeasOffset.0.0059
Summary of Contents for ZVB 4
Page 57: ...Instrument Construction and Function Description R S ZVB 1145 1078 82 I 3 2 E 1 ...
Page 133: ...1145 1078 82 5 5 E 1 Spare Parts List Mechanical Drawings ...
Page 142: ...1145 1078 82 5 15 E 1 Block Circuit Diagram ...
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Page 153: ...1145 1078 82 5 17 E 1 Circuit diagrams ...
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