HP 85106D, Manual

Page: 64 / 244

HP 85106D mm-Wave System 2-19
Operation
TRL 2-Port Calibration
TRL 2-Port Calibration
The TRL 2-Port calibration procedure is recommended for general
measurements of 2-port devices. It is required when performing the
complete performance verification procedure. The procedure consists of
measuring:
•
A zero length thru connection.
•
Short circuits at each port.
•
Terminations at each port for isolation.
•
A waveguide shim as the line standard.
This calibration procedure produces 12 term error correction and provides
the best accuracy for 2-port devices.
1. Set the averaging factor to 128 by pressing in the RESPONSE [
MENU
]
{
AVERAGING ON/restart
} [
128
] [
x1
].
Leave the AVERAGING FACTOR as the active function. This allows you to
change the averaging factor for different calibration standards during the
calibration procedure.
NOTE
If system performance verification is being done, the averaging factor is set
to 1024 by the performance verification program and should not be changed.
2. Start the calibration procedure by pressing:
[
CAL
]
{
CAL KIT 1 WR-xx
}
{
CALIBRATE:TRL 2-PORT
}
3. Connect Port 1 directly to Port 2 and press {
THRU
}. The system makes 6
measurements.
4. Connect the short to Port 1 and press {
S11 REFLECT
}. The system
measures S
11
.
5.
C
onnect the short to Port 2 and press {
S11 REFLECT
}. The system
measures S
22
.
6. Press {
ISOLATION
}. Isolation calibration is recommended for wide
dynamic range measurements, but it is not required. To omit the
isolation part of the calibration press {
OMIT ISOLATION
} then proceed with
“Performing the Optional Isolation Calibration” on page 2-20.