B+K precision 9120 User manual

Instruction Manual

Model 9120, 9121, 9122 & 9123

SINGLE OUTPUT PROGRAMMABLE DC POWER SUPPLY

Table of contents

General Information ……………………………………………. 5

Features …………………………………………………..……… 7

Local Mode Operation………………….……………………….. 9

Front Panel Description ……………………………………………. 9

Memory Key ………………………………………………………. 9

Storing States in Front Panel Mode ………………………………… 12

Recall Key …………………………………………………………. 14

Recalling States in Front Panel Mode ……………………………… 16

Limit Key ………………………………………………………….. 17

Modes of Operation ……………………………………………….. 18

Constant Current Operation ………………………………………... 20

Constant Voltage Operation ………………………………………... 22

On / Off Key ……………………………………………………….. 24

Remote / Local Key ………………………………………………... 25

Local Mode Function ……………………………………………… 25

Remote Interface Configuration …………………………………… 25

RS-232 Configuration ……………………………………………... 27

GPIB / 488 Configuration …………………………………………. 28

Remote Mode and Indicators ……………………………………… 29

Errors / Calibrate key ………………………………………………30

Calibration Overview ……………………………………………. 33

Calibration Security Code ……………………………………...... 33

Unsecure Procedure for Calibration …………………………….… 34

Hardware Unsecure Procedure for Calibration ……………………. 37

Calibration Procedure …………………………………………… 39

Voltage Calibration Procedure ……………………………………. 40

Volt Zero Scale Calibration ……………………………………….. 40

Volt Full Gain Calibration ………………………………………... 41

OVP Calibration …………………………………………………… 42

Current Calibration Procedure …………………………………….. 43

Current Zero Scale Calibration ……………………………………. 43

Current Full Gain Calibration …………………………………….. 44

OVP / Secure Key ………………………………………………….. 46

Programming OVP in Front Panel Mode …………………………. 49

Clearing Overvoltage Condition …………………………………… 50

Rear Panel Description ……………………………………………… 54

Table of contents

Remote Interface ……………………………………..………….. 55

RS-232 Interface …………………………………………………... 55

GPIB / 488 Interface ………………………………………………. 56

Functional Description of GPIB / 488 Interface ………………….. 57

IEEE 488 Addressing ……………………………………………... 58

Bus Description ……………………………………………………. 59

Sending Commands Over GPIB Remote Interface ……………….. 61

Serial Poll Procedure ……………………………………………… 62

Interrogative Commands Over GPIB Interface …………………… 62

Commands Sent Over Remote Interface ………………………….. 63

Introduction to SCPI Language …………………………………… 64

SCPI Commands Overview ………………………………………. 69

DISPlay Subsystem ……………………………………………….. 69

MEASure Subsystem ………………………………………………. 70

MEMory Subsystem ………………………………………………... 71

OUTPut Subsystem ………………………………………………… 72

SOURce Subsystem ……………………………………………….. 73

STATus Subsystem ………………………………………………… 80

SYSTem Subsystem ……………………………………………….. 81

TRIGger Subsystem ……………………………………………….. 82

Non_SCPIcommands ………………………………………………. 86

IEEE 488.2 commands ……………………………………………... 87

IEEE 488 Bus Commands …………………………………………. 89

ASCII Table for GPIB ……………………………………………… 91

SCPI Status Registers ……………………………………………….. 93

Error Messages …………………………………………………… 97

Command Errors …………………………………………………… 97

Execution Errors …………………………………………………… 99

Device Specific Errors ……………………………………………... 99

Self-test Errors …………………………………………………….. 100

Calibration Errors …………………………………………………. 102

Table of contents

Technical Specifications ……………………………………….… 105

Supplemental Characteristics ……………………………………… 110

Programming Ranges ………………………………………………. 112

Reset Values ………………………………………………………... 113

InterfaceCable ……………………………………………………… 114

Warranty Information ……………………………………….… 115

Service Information ………………………………………….… 117

General Information

Single output programmable DC power supplies.

Output voltage is: 0 to 30.0V for Model 9120

0 to 20.0V for Model 9121

0 to 60.0 V for Model 9122

0 to 30.0 V for Model 9123

Output current is: 0 to 3.00A for Model 9120

0 to 5.00 A for Model 9121

0 to 2.50 A for Model 9122

0 to 5.00 A for Model 9123

The power supply can be locally or remote controlled.

Available interfaces for 912x power supply models:

9120 9121 9122 9123

RS-232 Standard Standard Standard Standard

GPIB / 488 Optional Optional Optional Standard

The commands available in remote interface mode are

•SCPI (Standard Commands for Programmable Instruments) commands

(1999 SCPI standard)

•IEEE 488.2 commands

•IEEE 488 bus commands (only for GPIB / 488 interface)

Features

•Constant Voltage / Constant Current modes of operation

This power supply can operate in either constant voltage or constant current

modes. The passing from one mode of operation to another is automatic.

The active mode of operation is indicated using two indicators:

CV –constant voltage mode of operation

CC –constant current mode of operation

•Overvoltage protection

Overvoltage protection circuit can be locally or remote activated.

When it is active, ovp indicator is displayed.

•Output on / off

When output off, output voltage is 0 V.

This permits a zero output voltage without switching off the power supply.

•100 operating states storage

States are identified by location number and name.

Stored parameters are: voltage limit, voltage step, overvoltage protection level,

state of overvoltage protection circuit, current limit, current step, voltage trigger

value, current trigger value, trigger delay value, trigger source, stored state

name, state of display, output state.

After power on, state 0, named power_up will become the current operating

state.

•error messages

Errors are stored in a 20 locations FIFO (first in first out) queue.

They can be read in local mode (error number returned) or in remote operation

mode (error number and definition returned).

Every error is announced by a beep and the err indicator.

Local mode operation

Front Panel Description

Memory Key

Note: Memory location 00 is the power_up state. When the unit is powered up,

the power supply will set itself to the settings stored in location 00.

Note: If you press the Recall button while turning the power on,the power

supply will power up using memory location 01 parameters.

This button is used to store power supply’s current operating state in non-

volatile memory. Using this function all operating parameters are saved so they

can be recalled. You can store 100 different operating states (numbered from 0

to 99) in the non-volatile memory.

Stored parameters are: voltage limit, voltage step, overvoltage protection level,

state of overvoltage protection circuit, current limit, current step, voltage trigger

value, current trigger value, trigger delay value, trigger source, stored state

name, state of display, output state.

By pressing Memory key, you enter in Memory menu.

By turning the knob following options will be displayed:

Store State

Name State

Exit

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