Specifications

A front panel keypad, rotary knob, and IBM compatible keyboard inter
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face provide user interaction with the MS462XX Central Processor Mod
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ule. The system is also equipped with a floppy disk drive and non-volatile
internal memory for storage and retrieval of data and front panel setup
information.
The MS462XX implements an IEEE 488.2 GPIB interface that allows an
externally connected instrument controller to control the MS462XX sys
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tem in the “Remote-Only” mode. All MS462XX measurement and in
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put/output operations may be controlled remotely in this mode.
An internal service log stores a record of system failures, data about the
failures, and other key system service information. The service log is im
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plemented using an internal battery-backed SRAM memory.
2-3 SOURCE MODULE There are two source modules for the MS462XX Series Vector Network
Measurement System. The Source/Local Oscillator Module is standard on
all models and an Optional Source Module is installed when using 3- and
4-port configurations with an active internal source.
The Source/Local Oscillator module generates the primary source RF and
local oscillator output. This module contains the phase lock circuitry for
the oscillator’s circuitry to generate different output frequency bands cov-
ering 10 MHz to 3000 MHz, and banks of switched filter sections. The
source output level is controllable through an ALC loop, whereas the Lo-
cal Oscillator output level is fixed. In addition to the Source and Local Os-
cillator RF outputs, this module also provides Common Offset and Het-
erodyne VCO signals used by the optional second source.
The optional Source module generates the optional source RF output.
This module contains the phase lock circuitry for the oscillator’s circuitry
to generate different output frequency bands spanning 10 MHz to
3000 MHz, and banks of switched filter sections. The source output level
is controllable through an ALC loop. The module receives the Common
Offset and Heterodyne VCO signals from the Primary Source/Local Oscil
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lator Number modules.
While both modules are similar, the Source/ Local Oscillator module is a
fully laden assembly, while the optional Source module contains only the
circuitry for the optional source output. Each module has a separate PCB
assembly, but both use a common housing.
Typical RF output specifications for the modules are:
RF Output Frequency Range: 10 MHz to 3 GHz
Unleveled Source Port Power Level: 27 dBm Max., 16 dBm Min.
LO Port Power Level: 12 dBm Max., 1 dBm Min.
RF Output Frequency Range: 800 MHz to 1600 MHz
Heterodyne Output Power Level: 4 dBm Max., –3 dBm Min.
Common Offset Power Level: 7 dBm Max., 1 dBm Min.
2-4 MS462XX MM
SOURCE MODULE THEORY OF OPERATION