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66 User’s and Service Guide
87050A Option K22 Theory of Operation
Theory of Operation
The theory of operation begins with a general description of the Agilent 87050A Option
K22 multiport test set. This is followed by more detailed operating theory. The operation of
each group is described briefly, to the assembly level only. Detailed component-level circuit
theory is not provided.
System Theory
The test set consists of three main components: a power supply, front panel display, and
main switch board. The purpose of the power supply is to supply power to both the front
panel display and the main switch board. The front panel display serves to indicate the
switching paths to the user. Finally, the main switch board does the actual switching
between the different ports.
A1 Power Supply Theory
The switching power supply provides regulated dc voltages to power all assemblies in the
test set. A dc cable provides power to the main switch board. A connector from the main
switch board to the front panel display provides dc power and control signals to the front
panel. The power supply provides the following supplies: +5V, +24V, +12V.
The power LED on the front panel indicates that the instrument is on and that the power
supply is providing power.
A2 Front Panel Display Theory
The front panel display consists of an LCD. The LCD is divided into two lines, forward and
reverse. The first line indicates which of the twelve ports are connected to the forward
path. The second line indicates which of the twelve ports are connected to the reverse path.
Control signals and DC power are provided via a cable connected to the main switch board.
A3 Controller (Mother Board) and Switch Driver (Daughter Board)
Board Theory
Refer to Figure 16 on page 65 for the following discussion.
The mother and daughter boards provide the bias for the switching paths for the various
ports to the A i/p or B i/p ports. The front panel display contains an LCD that indicates the
switched ports. A particular test port (1 through 12) can be in one of three states. The three
states are:
1. Switched to the forward path
2. Switched to the reverse path
3. Terminated in 50 Ω
- Agilent Technologies 1
- 87050A Option K22 1
- Warranty Statement 4
- Safety Notes 5
- Definitions 5
- Contents 7
- Description 10
- Verifying the Shipment 10
- Electrical 11
- Environmental 11
- Cabinet Dimensions 11
- 4 User’s and Service Guide 12
- Preparations 13
- Figure 3 Power Cables 14
- User’s and Service Guide 7 15
- Getting Started 16
- User’s and Service Guide 9 17
- 10 User’s and Service Guide 18
- Typeface Key Conventions 19
- Commands 20
- NETWORK ANALYZER 21
- 87050A-K22 21
- CONTROLLER 21
- GPIB (HP-IB) 21
- Network Analyzer Control 22
- Table 2 Test Port Addresses 23
- 20 User’s and Service Guide 28
- 87050A Option K22 Commands 28
- 22 User’s and Service Guide 30
- Calibrating the Test System 32
- Making Measurements 33
- Example Programs 34
- Front Panel 51
- 44 User’s and Service Guide 52
- 87050A Option K22 Front Panel 52
- Rear Panel 53
- 46 User’s and Service Guide 54
- 87050A Option K22 Rear Panel 54
- Specifications 55
- Performance Tests 56
- Insertion Loss 57
- Return Loss 57
- Isolation 58
- Performance Test Record 59
- 52 User’s and Service Guide 60
- User’s and Service Guide 53 61
- 54 User’s and Service Guide 62
- User’s and Service Guide 55 63
- 56 User’s and Service Guide 64
- User’s and Service Guide 57 65
- 58 User’s and Service Guide 66
- Adjustments 67
- Table 14 Replaceable Parts 68
- General Troubleshooting Notes 71
- Power Supply Problems 71
- Front Panel Board 72
- User’s and Service Guide 65 73
- Theory of Operation 74
- Connector Replacement 75
- Introduction 76
- Before Applying Power 76
- Connector Care and Cleaning 76
- Declaration of Conformity 76
- Statement of Compliance 76
- General Safety Considerations 77
- ICES/NMB-001 79
- User’s and Service Guide 73 81
- Service and Support Options 82
- Contacting Agilent 82
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