Instrument Construction and Function Description R&S ZVB
1145.1078.82 3.84 E-4
Testing the Motherboard
28 V supply
Using a multimeter, measure the voltage at X 100.B5 (wrt ground).
Permissible deviation: ± 0.5 V
Preamplifier for DC measurement inputs
Apply the DC voltages listed in the table using the 4-pin Mini-DIN connector at the DC measurement
input.
Measure the DC voltage with a multimeter.
Input Voltage at Gnd APPLIED
VOLTAGE
Measurement at Rated value
DC MEAS -1 V to +1 V 8 3, 5, 6 - 1 V X 141.B10 2.33 V
DC MEAS -1 V to +1 V 6 3, 5, 8 + 1 V X 141.B11 2.33 V
DC MEAS -10 V to +10 V 8 3, 5, 6 - 10 V X 141.D10 2.33 V
DC MEAS -10 V to +10 V 6 3, 5, 8 + 10 V X 141.D11 2.33 V
Pin assignment DC MEAS connector
If the measured value is more than 10% above or more than 10% below the stated nominal value, the
motherboard must be replaced.
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