Rohde & Schwarz 1145.1010.04/05/06, Operating Manual

Page: 154 / 813

Calibration Overview R&S
®
ZVA/ZVB/ZVT
1145.1084.12 3.44 E-1
Performing an Automatic Calibration
After connection and initialization, you can use the calibration unit as follows:
1. Connect ports 1 through n (n = 1 to 4, depending on your analyzer model and the number of
ports to be calibrated) of the unit to the corresponding ports 1 through n of the analyzer.
Terminate all unused ports (no. n + 1 to 4) with a 50
Ω
match.
2. Perform the automatic calibration for the selected number of ports using the Measurement
Wizard or the Start Calibration menu.
3. Remove the test cables from the unit, connect your DUT instead and perform calibrated
measurements.
Accuracy considerations
To ensure an accurate calibration, please observe the following items:
•
The port numbers of the analyzer and the calibration unit must match. A 1-port calibration can
be performed at port 1 or port 2, a 2-port calibration at ports 1 and 2 etc; see tables below. E.g.,
to perform any calibrated measurement using port 3 or 4, a 3- or 4-port calibration is required.
•
Unused ports of the calibration unit must be terminated with a 50
Ω
match.
•
No adaptors must be inserted between the calibration unit and the test ports.
•
After connecting the unit to the USB port, allow for a sufficient warm-up time (see
"Specifications" ) before starting the calibration.
•
To ensure best accuracy the analyzer automatically reduces the source power to –10 dBm. If
the test setup contains a large attenuation, deactivate
Automatic Power Reduction for
Calibration Unit in the initial tab of the System Config dialog and ensure an input power of –10
dBm at the ports of the calibration unit (please also refer to the separate "Specifications"
document).
Attention!
The maximum RF input power of the calibration unit is beyond the
RF output power range of the analyzer, so there is no risk of
damage if the device is directly connected to the test ports. If you
use an external power amplifier, make sure that the maximum RF
input power of the calibration unit quoted in the data sheet is never
exceeded.
The calibration type depends on the number of ports:
ZV-Z51: Number of ports calibrated Calibration type
1 (port 1 or port 2) Full one port
2 (ports 1 and 2) TOSM
3 (ports 1, 2, and 3) TOSM
4 (ports 1, 2, 3, and 4) TOSM