B+K precision 9120 User manual

Instruction Manual

Model 9120, 9121 & 9122

SINGLE OUTPUT PROGRAMMABLE DC POWER SUPPLY

Table of contents

General Information ……………………………………………. 3

Features …………………………………………………..……… 5

Local Mode Operation………………….……………………….. 7

Front panel description ……………………………………………. 7

Memory key ………………………………………………………. 7

Storing states in front panel mode ………………………………… 10

Recall key …………………………………………………………. 12

Recalling states in front panel mode ……………………………… 14

Limit key ………………………………………………………….. 15

Modes of operation ……………………………………………….. 16

Constant current operation ………………………………………... 18

Constant voltage operation ………………………………………... 20

On / Off key ……………………………………………………….. 22

Remote / Local key ………………………………………………... 23

Errors / Calibrate key ………………………………………………25

Calibration Overview……………………………………………. 28

Calibration security code ……………………………………...... 28

Unsecure procedure for calibration …………………………….… 29

Hardware unsecure procedure for calibration ……………………. 32

Calibration Procedure …………………………………………… 34

Voltage Calibration Procedure ……………………………………. 35

Volt Zero Scale Calibration ……………………………………….. 35

Volt Full Gain Calibration ………………………………………... 36

OVP Calibration …………………………………………………… 37

Current Calibration Procedure …………………………………….. 38

Current Zero Scale Calibration ……………………………………. 38

Current Full Gain Calibration …………………………………….. 39

OVP / Secure key ………………………………………………….. 41

Programming OVP in front panel mode …………………………. 44

Clearing OVP condition …………………………………………… 46

Rear panel description ……………………………………………… 50

Remote Interface ……………………………………..………….. 51

SCPI Commands …………………………………………………. 52

SCPI Commands Overview ………………………………………. 54

DISPlay Subsystem ……………………………………………….. 54

Table of contents

OUTPut Subsystem ………………………………………………… 55

SYSTem Subsystem ……………………………………………….. 55

SOURce Subsystem ……………………………………………….. 56

MEASure Subsystem ………………………………………………. 62

TRIGger Subsystem ………………………………………………… 63

Non_SCPI commands ………………………………………………. 67

IEEE 488.2 commands ……………………………………………... 68

SCPI Status Registers ……………………………………………….. 70

Error Messages …………………………………………………… 74

Command Errors …………………………………………………… 74

Execution Errors …………………………………………………… 76

Device-specific Errors ……………………………………………... 76

Self-test Errors …………………………………………………….. 77

Calibration Errors …………………………………………………. 79

Technical Specifications ……………………………………….… 82

Supplemental Characteristics ……………………………………… 86

Programming Ranges ………………………………………………. 88

Reset Values ………………………………………………………... 89

Interface Cable ……………………………………………………… 90

Warranty Information ……………………………………….… 91

Service Information ………………………………………….… 93

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

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

The power supply can be locally or remote controlled.

Interfaces: RS232 (Standard)

The commands available in remote interface mode are

•SCPI (Standard Commands for Programmable Instruments) commands

(SCPI 99 standard)

Features

•Constant Voltage / Constant Current modes of operation

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

modes. The passingfrom 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 circuitcan 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 keys 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 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

Options are selected by pressing Memory key when the desired option is

displayed.

Memory menu overview

Store State option will store the current operating state without setting a

name for this state. The state will be identified using location number in

non-volatile memory and the default name.

By pressing Memory key, state number and state name are displayed in

ascending order by turning the knob.

In this menu,Exit option is available, too. In this case, you leave the store

operation mode, without changing anything. No Change message will be

displayed and the power supply returns to the previous state (the state

before entering Memory menu).

The states are scrolled using the knob.

A location is selected by pressing Memory key. If the location you choose

is already written, it is overwritten (without any warning) with the current

state parameters, but the name (the set one or the default one remains

unchanged). Done message will be displayed.

Name State option allows you to set a name for the current state (you can

also change a name set before).

The state name can have up to 10 charatcters. The default name is 10 blank

characters.

By pressing Memorykey, state number of non-volatile memory locations is

displayed in ascending order by turning the knob.

In this menu Exit option is available, too. In this case, you leave the store

operation mode, without changing anything. No Change message will be

displayed and the power supply returns to the previous state (the state

before entering Memory menu).

The states are scrolled using the knob.

Store State

Name State

By pressing Memory key again, state name can be set.

Important note!

A state name must be set here, or the state will not be saved.

When setting the name, selected digit has the cursor underneath it.

Characters of the name are selected by rotating the knob. When desired

ASCII character is displayed, you can pass to another digit selection using >

< cursor position keys. When the name is set, you press Memory again and

the current state is stored in the selected location of the non-volatile

memory. Done message will be displayed.

Important note!

Store State option will store the parameters of current operation state and will

not set a name for the stored state.

NameState option will set a name for the the state to be saved.

Exit option allows you to leave the store operation mode, without changing

anything. No Change message will be displayed and the power supply

returns to the previous state (the state before entering Memory menu).

Important note!

If you enter in the Memory menu and no action takes place for approx. 20

seconds, the power supply leaves the Memory menu. No Change message is

displayed and the power supply returns to the previous state (the state before

entering Memory menu).

Exit

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