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Chapter 10
AutoCal
10-1
INTRODUCTION This chapter provides a general description of the AutoCal calibrators,
including specifications, setup, and the use of the associated software
and on-line documentation. This series has three members, as shown
below. Throughout this manual, the term AutoCal will refer to the se-
ries. Individual models will be referred to by model number. Figure
10-1 shows the AutoCal module and all of its attaching parts.
Model Switch Freq. Range Connector.
36581NNF Electronic 40MHz-18 GHz N (Male)-N(Fem)
36581KKF Electronic 40MHz-20 GHz K(Male)-K(Fem)
36582KKF Mechanical 40MHz-40 GHz K(Male)-K(Fem)
10-2
DESCRIPTION The AutoCal module provides an automatic system for fast, repeatable
high-quality calibrations of a Vector Network Analyzer (VNA). The
AutoCal module is inserted between the VNA test ports to perform the
calibration. The AutoCal module is connected between Ports 1 and 2.
Refer to Figure 10-2 for a diagram of the AutoCal connections.
The electronic AutoCal modules use solid state electronic switches to
exchange the internal calibration standards. Note that these units
have a lower frequency limit (18 and 20 GHz). The mechanical module
uses electromechanical actuators to exchange the standards and has
the highest frequency limit, but has a small non-repeatability error.
The mechanical module contains internal standards used to measure
port isolation; the electronic module does NOT contain isolation stan-
dards and requires a manual operation to perform this measurement.
A standard serial RS-232 interface cable is used to connect the
AutoCal module to the 37XXXC. Power is supplied by a connecting ca-
ble from a Universal power supply (+5V, +15V, -15V for the electronic
modules; +5V, +24V for the mechanical modules). A power on-off
switch is not provided.
Test Port Cable Converters (ANRITSU series 36583) are used during
and after the calibration process to establish the desired test port con-
nector type and sex.
37XXXC OM 10-3