Agilent Technologies N3280A User Manual Page 25
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Installation - 2
25
Maintaining Stability
In voltage priority mode, the constant voltage loop has the following three compensation bandwidths:
♦ 30 kHz, 20 kHz; and 10 kHz
In current limit operation, only two compensation bandwidths are available:
♦ 30 kHz and 10 kHz
If the output of your unit is being shut down by the oscillation protection circuit because of long load
wires or a high Q load impedance, you can reprogram the output compensation bandwidth to try and
eliminate the oscillation. As shipped from the factory, the compensation bandwidth is set to 30 kHz.
OVP Considerations
CAUTION: Disabling the OVP protection circuit may cause excessive output voltages, such as can
occur if remote sense leads are shorted, to damage the equipment under test.
The dc source is shipped from the factory with its overvoltage protection circuit enabled. You can disable
the OVP circuit using the VOLTage:PROTection:STATe command as explained in chapter 6. The
overvoltage circuit automatically turns the output off and opens the output relays if the output voltage
exceeds +11.5V (±0.3V) or − 11.5V (±0.3V)
External Trigger Connections
This rear panel connector has an external trigger input.
The trigger input pin is normally at a TTL high level. To generate a trigger, you can provide a negative-
going TTL signal to the trigger input, or momentarily connect a short (contact closure) from the trigger
input pin to the chassis ground pin on the trigger connector. In any case, the device that you use to
implement the trigger must be able to sink approximately 1mA.
The external trigger input can trigger both output voltage/current changes and output measurements.
Computer Connections
The dc source can be controlled through a GPIB interface.
GPIB Interface
Follow the GPIB card manufacturer's directions for card installation and software driver setup. Dc
sources may be connected to the GPIB interface in series configuration, star configuration, or a
combination of the two, provided the following rules are observed:
♦ The total number of devices including the GPIB interface card is no more than 15.
♦ The total length of all cables used is no more than 2 meters times the number of devices connected
together, up to a maximum of 20 meters. (Refer to table 1-2 for a list of available GPIB cables.)
♦ Do not stack more than three connector blocks together on any GPIB connector.
♦ Make sure all connectors are fully seated and the lock screws are firmly finger-tightened.
- USER’S GUIDE 1
- Warranty Information 2
- Safety Summary 3
- Declaration Page 5
- Acoustic Noise Information 6
- Printing History 6
- Table of Contents 7
- PROGRAMMING THE DC SOURCE 39 8
- LANGUAGE DICTIONARY 53 9
- SPECIFICATIONS 79 10
- ERROR MESSAGES 103 11
- LINE VOLTAGE SELECTION 107 11
- INDEX 111 11
- General Information 13
- Options and Accessories 14
- Description 14
- Output Characteristics 15
- Current Priority Operation 16
- Measurement Characteristics 17
- Start of a Measurement 18
- Installation 19
- Location 20
- Power Connections 21
- Outputs 1 - 4 22
- Current Ratings 23
- Coaxial Guard Connections 24
- External Trigger Connections 25
- Computer Connections 25
- 4 3 2 1 0 26
- Address = 5 26
- Turn-On Checkout 27
- Checkout Procedure 28
- In Case of Trouble 29
- Introduction to Programming 31
- Moving Among Subsystems 33
- Including Common Commands 33
- Using Queries 33
- Types of SCPI Messages 34
- SCPI Data Formats 35
- SCPI Command Completion 36
- Using Device Clear 37
- Programming the DC Source 39
- Overvoltage Protection 40
- Output Current 40
- Output Mode 40
- Oscillation Protection 41
- Output Trigger Model 41
- Making Measurements 43
- Power Line Cycles 44
- Triggered Measurements 45
- Measurement Trigger Model 46
- Output Settling Delay 47
- Operation Status Group 50
- Questionable Status Group 51
- Standard Event Status Group 51
- Status Byte Register 51
- Language Dictionary 53
- 6 – Language Dictionary 54
- Language Dictionary - 6 55
- Calibration Commands 57
- CALibrate:DATA 58
- CALibrate:DATE 58
- CALibrate:LEVel 58
- CALibrate:PASSword 58
- CALibrate:SAVE 59
- CALibrate:STATe 59
- CALibrate:VOLTage 59
- Measurement Commands 60
- MEASure:ARRay:CURRent? 61
- MEASure:ARRay:VOLTage? 61
- MEASure:CURRent? 61
- MEASure:VOLTage? 61
- SENSe:CURRent:RANGe 61
- SENSe:FUNCtion 62
- SENSe:SWEep:NPLCycles 62
- SENSe:SWEep:OFFSet:POINts 62
- SENSe:SWEep:POINts 63
- SENSe:SWEep:TINTerval 63
- SENSe:WINDow 63
- Output Commands 64
- [SOURce:]CURRent[:IMMediate] 65
- [SOURce:]CURRent:TRIGgered 65
- [SOURce:]CURRent:LIMit:BWIDth 65
- [SOURce:]CURRent:MODE 66
- [SOURce:]CURRent:LIMit:MODE 66
- [SOURce:]DELay 66
- [SOURce:]DELay:MODE 66
- [SOURce:]FUNCtion:MODE 67
- [SOURce:]VOLTage:ALC:BWIDth 67
- [SOURce:]VOLTage[:IMMediate] 67
- [SOURce:]VOLTage:TRIGgered 67
- [SOURce:]VOLTage:MODE 68
- Status Commands 69
- STATus:OPERation:NTR 70
- STATus:OPERation:PTR 70
- STATus:PRESet 70
- STATus:QUEStionable[:EVENt]? 70
- STATus:QUEStionable:ENABle 71
- STATus:QUEStionable:NTR 71
- STATus:QUEStionable:PTR 71
- System Commands 72
- Trigger Commands 73
- TRIGger:ACQuire:SOURce 74
- TRIGger[:TRANsient]:SOURce 74
- TRIGger[:TRANsient] 74
- Common Commands 75
- 6 – Language Dictionary 76
- Language Dictionary - 6 77
- Table 6-7. *RST Settings 77
- Specifications 79
- A - Specifications 80
- Specifications - A 81
- Introduction 83
- Equipment Required 83
- Measurement Techniques 84
- Electronic Load 85
- Programming 85
- Test Setup 85
- Voltage Priority Tests 86
- Negative Current Limit (-CL) 87
- Current Priority Tests 88
- Load Effect Tests 89
- Source Effect Tests 91
- Ripple and Noise Tests 94
- Transient Response Tests 95
- Transient 96
- Performance Test Record Form 98
- Enable Calibration Mode 99
- Calibration 101
- Calibration Error Messages 102
- Error Messages 103
- C – Error Messages 104
- Error Messages - C 105
- Line Voltage Selection 107
- Rear Panel Pinout Assignments 109
- Mating Connector Part Numbers 109
- Manual Updates 116
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