I-Tech IT6821 User manual

1
IT6800 series SCPI
Programmable DC Power Supply
Model IT6821/IT6822/IT6823/
IT6831/IT6832/IT6833/IT6834
©Copyright2004 AllRightsReserved
Ver2.0 /Sep 2005/ IT6800-603

2
Directory
About your safety..........................................................................................................................................3
Certification and Warranty ..........................................................................................................................3
Chapter 1 Remote Operation Mode ..........................................................................................................5
Chapter 2 SCPI Order List..........................................................................................................................5
2.1 IEEE488.2 Common Order..........................................................................................................5
2.2 SCPI Essential Order....................................................................................................................5
2.3 Calibration Order............................................................................................................................6
2.4 Output Order...................................................................................................................................6
2.5 Output Measure Order..................................................................................................................6
Chapter 3 SCPI Condition Register...........................................................................................................6
Chapter 4 SCPI Order Description............................................................................................................9
4.1 IEEE488.2 Common Order..........................................................................................................9
4.2 SCPI Essential Order..................................................................................................................10
4.3 Output Order.................................................................................................................................12
4.4 Input measurement order...........................................................................................................13

3
About your safety
Pease review the following safety precautions before operating our equipment.
General information
The following safety precautions should be observed before using this product and any associated
instrumentations. Although some instruments and accessories would be used with non-hazardous
voltages, there are situations where hazardous conditions may be present.
This product is intended for use by qualified personnel who recognize shock hazards and are
familiar with the safety precautions required to avoid possible injury. Read and follow all
installation, operation, and maintenance information carefully before using the product. Refer to
this manual for complete product specifications.
If the product is used in a manner not specified, the protection provided by the product may be
impaired.
Before performing any maintenance, disconnect the line cord and all test cables.
Protection from electric shock
Operators of this instrument must be protected from electric shock at all times. The responsible
body must ensure that operators are prevented access and/or insulated from every connection
point. In some cases, connections must be exposed to potential human contact. Product operators
in these circumstances must be trained to protect themselves from the risk of electric shock. If the
circuit is capable of operating at or above 1000 volts, no conductive part of the circuit may be
exposed.
Definition of users
Responsible body is the individual or group responsible for the use and maintenance of equipment
is operated within its specifications and operating limits, and for ensuring that operators are
adequately trained.
Operators use the product for its intended function. They must be trained in electrical safety
procedures and proper use of the instrument. They must be protected from electric shock and
contact with hazardous live circuits.
Service is only to be performed by qualified service personnel.
Safety symbols and terms
Connect it to safety earth ground using the wire recommended in the user
manual.
The symbol on an instrument indicates that the user should refer to the operating
instructions located in the manual.
High voltage danger
Certification and Warranty
Certification
We certify that this product met its published specifications at time of shipment from the factory.
Warranty

4
This instrument product is warranted against defects in material and workmanship for a period of
one year from date of delivery. During the warranty period we will, at its option, either repair or
replace products which prove to be defective. For warranty service, with the exception of warranty
options, this product must be returned to a service facility designated by us. Customer shall
prepay shipping charges by (and shall pay all duty and taxes) for products returned to the supplier
for warranty service. Except for products returned to customer from another country, supplier shall
pay for return of products to customer.
Limitation of Warranty
The foregoing warranty shall not apply to defects resulting from improper or inadequate
maintenance by the Customer, Customer-supplied software or interfacing, unauthorized
modification or misuse, operation outside of the environmental specifications for the product, or
improper site preparation and maintenance.

5
Chapter 1 Remote Operation Mode
IT-E133 GPIB Communication Cable
The DB9 interface connector on the rear panel of power supply is TTL voltage level; you can use
the GPIB communication cable (IT-E133) to connect the DB9 interface connector of the power
supply, and then connect the GPIB interface of the IT-E133 and computer with GPIB/IEEE 488 line
for the communication.
IT-E133 ISOLATED
Serial /IEEE 488 Controller
IT-E133 outer communication adapter
COM interface of
Power supply GPIB line
Chapter 2 SCPI Order List
2.1 IEEE488.2 Common Order
"*CLS"
"*ESE"
"*ESE?"
"*ESR?",
"*IDN?",
"*SRE",
"*SRE?",
"*STB?",
2.2 SCPI Essential Order
SYSTem
:ERRor[:NEXT]?
:VERSion?,
STATus
:QUEStionable
[:EVENt]?
:CONDition?
:ENABle <VALUE>
:ENABle?

6
2.3 Calibration Order
CALibration
:SECure
[:STATe] {<ON|OFF>,<quoted code>}
]:STATe]?
:VOLTage
:LEVel {<level> }
[:DATA] {<numeric value>}
:CURRent
:LEVel {<level> }
[:DATA] {<numeric value>}
:SAVe
:INITital
2.4 Output Order
OUTPut [:STATe] <b>
[:STATe]?
[SOURce:]
VOLTage
[:LEVel][:IMMediate][:AMPLitude]
[:AMPLitude]?
:PROTection[:LEVel]
[:LEVel]?
CURRent
[:LEVel][:IMMediate][:AMPLitude]
[:AMPLitude]?
2.5 Output Measure Order
MEASure
[:SCALar]
:VOLTage[:DC]?
:CURRent[:DC]?
:POWer[:DC]?
Chapter 3 SCPI Condition Register
You can get the condition of power supply and read parameter from the operation register. The
power supply can get the different state by 4 condition registers. These registers are status byte
register, standard event register, quest condition register and operation status register. The status
byte register stores the information of 3 other register. You can get each register’s meaning from
the following table:
BIT Signal Meaning
0 CV operation status register. The power supply is in constant voltage condition.

7
1
CC The power supply is in constant current condition. I
0
1
OT
UNR
Quest condition register
Over temperature
The output of power supply is unregulated.
0
2
3
4
5
7
OPC
QYE
DDE
EXE
CME
PON
Standard event status register
Operation of power supply is completed.
Query error. Data of output array is missing.
Device-dependent error. Data stored in register is missing or error occurs
in preliminary checkout.
Execution error. Order parameter overflows or the condition is not right.
Command error. Syntax or semantic error occurs when receiving
information.
Power on. It is 1when power supply is reset.
3
4
5
6
7
QUES
MAV
ESB
MSS
RQS
OPER
Status byte register
If a quest enable condition changes, QUES is 1.
If the output array buffer storage is not empty, MAV is 1.
If a standard event status enable register changes, ESB is 1.
If a operation event enable register changes, OPER is 1.
Structure of condition register as following:

8

9
Chapter 4 SCPI Order Description
4.1 IEEE488.2 Common Order
*CLS
This order can clean the register as follows:：
Standard event status register
Quest condition register
Operation event register
Status byte register
Error code
Order syntax：*CLS
Parameter：None
*ESE
This order can set the parameter of standard event enable register. Setting parameter can
determine which bit value of standard event register is 1 and the byte will enable ESB of
status byte register is 1.
Order syntax：*ESE <NRf>
Parameter：0~255
Reset value：Consult *PSC order
Example：*ESE 128
Quest syntax：*ESE？
Return parameter：<NR1>
Reference order：*ESR？*PSC *STB？
Bit determination of standard event enable register
Bit position 7 6 5 4 3 2 1 0
Bit Name PON Not used CME EXE DDE QYE Not used OPC
Bit Weight 128 32 16 8 4
PON Power-on
CME Command error
EXE Execution error
DDE Device-dependent error
QYE Query error
OPC Operation complete
*ESR?
This order can read the value of standard event status register. After executing this order,
standard event status register is reset. Bit definition of standard event status register is as the
same as the standard event status enable register
Quest syntax：*ESR？
Parameter：None
Return parameter：<NR1>
Reference order：*CLS *ESE *ESE？*OPC
*IDN?

10
This order can read information about power supply. The parameter it returns contains 4
segments divided by comma.
Quest syntax：*IDN？
Parameter：None
Return parameter：<AARD> segment description
ITECH manufacturer
XXXX product mode
XXXXXX product serial number
VX．XX software version number
For example：ITECH, IT6822, 6970001004, V1.54
*SRE
This order can set the parameter of status byte enable register. Setting parameter can
determine which byte value of status byte register is 1 and the byte will enable RQS of status
byte register is 1. Bit definition of status byte enable register is as the same as the status byte
register.
Order syntax：*SRE <NRf>
Parameter：0~255
Reset value：Consult *PSC order
Example：*SRE 128
Quest syntax: *SRE？
Return parameter：<NR1>
Reference Order：*ESE *ESR？*PSC *STB？
*STB?
This order can read the data from status byte register. After executing this order, status byte
register is reset.
Quest syntax：*STB？
Parameter：None
Return parameter：<NR1>
Reference order：*CLS *ESE *ESR
Bit determination of standard event status enable register
Bit Position 7 6 5 4 3 2 1 0
Bit Name OPER RQS ESB no use QUES no use no use no use
Bit Value 128 64 32 8
4.2 SCPI Essential Order
SYSTem:ERRor[:NEXT]?
This order can get the error code and error information of the power supply.
(0) No error
(1) Too many numeric suffices in Command Spec
(10) No Input Command to parse
(14) Numericsuffixisinvalidvalue
(16) Invalid value in numeric or channel list, e.g. out of range
(17) Invalid number of dimensions in a channel list
(20) ParameteroftypeNumericValueoverfloweditsstorage