Rohde & Schwarz ZVB 14, Service Manual

Page: 19 / 198

R&S ZVB Performance Test
1145.1078.82 1.9 E–4
Checking the Power Measurement Uncertainty
Instrument:
Power sensor or
Power meter with power sensor
(see Chapter “Test Equipment“, Item2)
Signal generator (see Chapter “Test Equipment“, Item5)
Power splitter (see Chapter “Test Equipment“, Item6)
Calibration kit (see Chapter “Test Equipment“, Item4)
Test cable (see Chapter “Test Equipment“, Item7)
Preparation/
test setup: Connect the signal generator to the power–splitter input using the test
cable.
Connect the power sensor to a power–splitter output
Connect the other power–splitter output to port1 (port2 to port 4) using an
adapter from the calibration kit
The reference oscillators in the signal generator and in the R&S ZVB
must be synchronized.
R&S
®
ZVB settings:
– [ Preset ]
– [ Meas : Wave Quantities: b1 Src Port 1
(b2 Src Port 2, b3 Src Port 3, b4 Src Port 4)]
– [ Power : RF Off ]
– [ Meas Bandwidth : 100 Hz ]
– [ Marker ]
– [ Sweep : Sweep Type : CW Mode :
CW Frequency : {f
GEN
*} ]
– [ Sweep : Single : Restart ]
* For the measurement frequencies, see Performance Test Report
{fGEN}.
Measurement: Signal generator : CW Mode, Frequency: f
gen
Signal–generator level: –5 dBm
Adjust the signal–generator level so that the power meter
reads 0 dB +/– 0.2 dB
Determine the signal–generator level that gives –10 dBm at the splitter
output. This level is required for the following measurement, “Checking
Receiver Linearity”.
Read off the power meter display and the R&S ZVB marker values.
Level error = L
ZVB
– L
PS