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ITech IT8700 Series User Manual

Dc programmable electronic loads
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DC Programmable Electronic
Loads
IT8700
Series
User Manual
Model: IT8722/IT8723/IT8731/IT8732/IT8733/
IT8722B/IT8732B/IT8733B/IT8701/IT8702/IT8703
Version: 4.2

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  • Page 1 DC Programmable Electronic Loads IT8700 Series User Manual Model: IT8722/IT8723/IT8731/IT8732/IT8733/ IT8722B/IT8732B/IT8733B/IT8701/IT8702/IT8703 Version: 4.2...
  • Page 2 Notices Warranty Safety Notices © Itech Electronic, Co., Ltd. 2019 The materials contained in this No part of this manual may be document are provided “as is”, and reproduced in any form or by any means (including electronic storage and...

  • Page 3: Limitation Of Warranty

    Warranty ITECH warrants that the product will be free from defects in material and workmanship under normal use for a period of one (1) year from the date of delivery (except those described in the Limitation of Warranty below).

  • Page 4: Safety Precautions

    Failure to comply with these precautions or specific warnings elsewhere in this manual will constitute a default under safety standards of design, manufacture and intended use of the instrument. ITECH assumes no liability for the customer’s failure to comply with these precautions.

  • Page 5: Environmental Conditions

    2002/96/EC Waste Electrical and Electronic Equipment (WEEE) Directive This product complies with the WEEE Directive (2002/96/EC) marking requirement. This affix product label indicates that you must not discard the electrical/electronic product in domestic household waste. Product Category Copyright © Itech Electronic Co., Ltd.
  • Page 6 With reference to the equipment classifications described in the Annex I of the WEEE Directive, this instrument is classified as a “Monitoring and Control Instrument”. To return this unwanted instrument, contact your nearest ITECH office. Copyright © Itech Electronic Co., Ltd.

  • Page 7: Compliance Information

    Connection of the instrument to a test object may produce radiations beyond the specified limit. Use high-performance shielded interface cable to ensure conformity with the EMC standards listed above. Safety Standard IEC 61010-1:2010/ EN 61010-1:2010 Copyright © Itech Electronic Co., Ltd.

  • Page 8: Table Of Contents

    4.3.2 Constant resistance (CR) mode ....................31 4.3.3 Constant voltage (CV) mode ...................... 31 4.3.4 Constant power (CW) mode ....................... 32 4.3.5 Operations ..........................33 4.4 Transient operation ..........................34 4.4.1 Continuous ..........................35 Copyright © Itech Electronic Co., Ltd.
  • Page 9 Remote operation ....................... 59 6.1 RS232 interface ..........................59 6.2 Ether Net interface ..........................61 6.3 GPIB interface ........................... 61 6.4 USB interface ............................ 61 Appendix ..............................63 Specifications of Red and Black Test Lines ..................... 63 Copyright © Itech Electronic Co., Ltd.

  • Page 10: Dc Programmable Electronic Loads

    Installation steps: Turn off the power switch and disconnect the 110V/220V power cord. Take off any packing materials around the mainframe. Push the module into the slot(as shown in figure 1-1) Copyright © Itech Electronic Co., Ltd.

  • Page 11: Channel Number

    IT8703 extended mainframe can be understood in the same way. Channel number sequentially are: 8,7,6,5,4,3,2,1 Fig 1-2 channel number distribution For example： If IT8702 mainframe contains two single channel modules IT8731 and two double channels modules IT8722, channel number is automatically Copyright © Itech Electronic Co., Ltd.

  • Page 12: Mainframe Installation

    单通道编号的例子 1.3 Mainframe installation The operating temperature of IT8700 series electronic load is 0 to 40℃. A fan cools the electronic load by drawing air through the top and sides and exhausting it out by the rear side. The electronic load must be installed in a location that allows sufficient space at the sides and back of the unit for adequate air circulation.
  • Page 13 Inspection and Installation  the dimensions of IT8701 IT8701 Mainframe size Detailed Dimension Drawing IT8701 Installation figure Copyright © Itech Electronic Co., Ltd.
  • Page 14 Inspection and Installation Detailed Dimension Drawing  the dimensions of IT8702/IT8703 IT8702 Mainframe size Detailed Dimension Drawing Copyright © Itech Electronic Co., Ltd.
  • Page 15 Inspection and Installation I T8702 Installation figure Detailed Dimension Drawing IT8703 Extended mainframe installation figure(dimension is the same as IT8702)  dimensions Module IT8722/IT8723/IT8731/IT8732//IT8722B IT8732B/IT8733B/IT8733 Copyright © Itech Electronic Co., Ltd.

  • Page 16: Connecting The Power Cord

    Connect the power cord after checking that the power switch of the instrument is turned OFF. AC power input level IT8700 series electronic load support 110V/220V AC input. Please pay attention to the AC level setup before provide AC power. (The AC line switch is located at the rear of the unit.) ...
  • Page 17 （L：Live or Active Conductor(also called “live” or “hot”; N：Neutral or identified conductor; E：Earth or Safety Ground） Connecting AC Input Connect standard power cord to the power supply input terminal. Connecting AC Input Figure 1-6 Connecting AC Input Copyright © Itech Electronic Co., Ltd.

  • Page 18: Chapter2 Quick Start

    This series have international advanced functions and features. IT8700 series DC electronic loads has four standard communication interfaces: RS232, USB, GPIB and Ether Net. ...

  • Page 19: Introduction

    2.2 Introduction This user’s manual introduces the specifications, installation, operation and programming of IT8700 series DC electronic loads. There’re two parts in IT8700 DC electronic loads, mainframe/ extended frame and modules. The frames mentioned are IT8701, IT8702 mainframe and IT8703 extended frame.

  • Page 20: Front Pannel Introduction

    The part introduces the location of terminals and interfaces on the rear panel. Refer to figure 2-2 for more details. ⑬ ⑭ ⑪ ⑫ ⑩ ⑨ ⑧ ⑦ ⑥ ⑤ ④ ③ ② ① Figure 2-2 IT8700 rear panel (take example of IT8702) Copyright © Itech Electronic Co., Ltd.

  • Page 21: Power-On Selftest

    Exception handling If the electronic load cannot start normally, please check and take measures by reference to steps below. Check whether the power line is correctly connected and confirm whether the electronic load is powered. Copyright © Itech Electronic Co., Ltd.
  • Page 22 T3.15A 250V IT8702 T5A 250V T3.15A 250V IT8703 T5A 250V T3.15A 250V 3) After replacement, install the fuse box back to original position, as shown below. Fuse Fig 2-3 fuse location (take example of IT8702) Copyright © Itech Electronic Co., Ltd.

  • Page 23: Chapter3 Panel Function Introduction

    The operation of setting and editing parameters of each channel referred below are on the mainframe front panel. Function keys ： The following are the detailed description about the functions and specific operations achievable of all the keys. Copyright © Itech Electronic Co., Ltd.

  • Page 24: Menu List

    3.1.2 Menu list Different modules of IT8700 series electronic loads have different setting and configuration menu according to different working modes. ▲ ▲ Setup Setup...
  • Page 25 Setup level A value Ta=0.0005S Setup level A width TRAN B=0.00A Setup level B value Tb=0.0005S Setup level B width T MODE Setup the transient mode CONTINUOUS Continuous mode PULSE Pulse mode Toggle mode TOGGLE Copyright © Itech Electronic Co., Ltd.
  • Page 26 OFF〈DEFAULT〉 REM SENSE SET Remote measuring Enable remote sense function OFF<DEFAULT> Disable remote sense function ABOUT Module production information Channel production model IT87XX VER: X.XX Channel software version Channel production serial number XXXXXXXXXXXXX EXIT Copyright © Itech Electronic Co., Ltd.
  • Page 27 Disable remote sense function ABOUT Module production information Channel production model IT87XX VER: X.XX Channel software version SN: XXXXXXXXXXXXX Channel production serial number EXIT System menu Shift Shift Press key to enter system menu function Copyright © Itech Electronic Co., Ltd.
  • Page 28 EXIT GPIB ADDRESS GPIB address setting GPIB ADDRESS SET Setup communication adress Ethernet setting ETHERNET SET GATEWAY SET Gateway setting IP setting IP SET MASK SET Mask setting SOCKET port setting PORT SET EXIT Copyright © Itech Electronic Co., Ltd.

  • Page 29: Channel Option

    3.1.6 Module keyboard lock Shift Press key to lock the Short、 Tran、 Mode、 On/Off operation keyboard Shift Shift and knobs of the current channel panel, press key again to unlock. Copyright © Itech Electronic Co., Ltd.

  • Page 30: Module Operation

    Dual channel module means a module have two channels. Each channel is isolated with the other. Setting of the module keyboard can control two channels. The left cannel is channel L, the right channel is channel R. Copyright © Itech Electronic Co., Ltd.

  • Page 31: Vfd Indicator Function Description

    Control module’s input state: on/off On/Off On/Off Rotary knob, used to change the setting parameter values Module’s air inlet 3.3 VFD indicator function description The detailed introduction of VFD’s all indicator functions are as bellow: Copyright © Itech Electronic Co., Ltd.

  • Page 32: 8-Pin Control Connector

    Figure 3-5 IT8700 rear panel 8-pin control connector (take example of IT8702) Trigger IN trigger signal input Trigger OUT trigger signal output ON/OFF IN synchronization ON/OFF control signal input ON/OFF OUT synchronization ON/OFF signal output Ground Ground Copyright © Itech Electronic Co., Ltd.

  • Page 33: External Trigger Connections

    3-6 connection to control its ON/OFF state. ON/OFF OUT indicates ON/OFF state of multi channels electronic load. If SYNC ON SET of any specific channel is set on, and the channel’s input state Copyright © Itech Electronic Co., Ltd.

  • Page 34: Extended Frame Connections

    IT8702 mainframe by pressing IT8703 IT8702 Figure 3-8 Expand connections 3.6 Controlling link There is an 8-pin connector on every module’s rear panel. The following will introduce in detail the 8 pins’ specific functions. Copyright © Itech Electronic Co., Ltd.

  • Page 35: Voltage Failure Indication

    When load is at CV、CV or CR mode, lead length are relatively long or load regulation is critical, or load consumes high-current, there will be voltage drop Copyright © Itech Electronic Co., Ltd.

  • Page 36: External Analogue Control

    Please lead wire from positive terminal on the rear panel of module to positive terminal of object. Similarly, connect the corresponding negative terminal. Figure 3-11 illustrates a typical connection of the module with the device to be measured. Copyright © Itech Electronic Co., Ltd.

  • Page 37: Parallel Connections

    For example, after being paralleled, two single channel modules (80V/40A/300W) can dissipate up to 80V/80A/600W. The following picture 3-12 illustrates the paralleled connection of two same models for increased power dissipation. fig 3-12 module parallel connection Copyright © Itech Electronic Co., Ltd.

  • Page 38: Chapter4 Operations Introduction

    4.2 PC control connection IT8700 series electronic load can achieve remote control via GPIB /RS232 /USB /ETHERNET, but only one interface can be used at one time. choose the interface via the system key （SYSTEM） . Connect Communication cable before power on.

  • Page 39: Constant Current (Cc) Mode

    The current slew rate determines the rate at which the input current to a module changes to a new programmed value. You can set current level’s rise/fall slew rate on the front panel or by remote operation. The slew rate programmed act in Copyright © Itech Electronic Co., Ltd.

  • Page 40: Constant Resistance (Cr) Mode

    4.3.3 Constant voltage (CV) mode In this mode, the electronic load will attempt to sink enough current to control the source voltage to the programmed value. See figure 4-3. Copyright © Itech Electronic Co., Ltd.

  • Page 41: Constant Power (Cw) Mode

    4.3.4 Constant power (CW) mode In CW mode, electronic load will consume a constant power. As shown in fig4-4, when input voltage increase, the input current will decrease, while power will remain the same. P=(V*I). Copyright © Itech Electronic Co., Ltd.

  • Page 42: Operations

    Enter Press key to enter range selection menu <Range>, press ▼ ▼ key to enter the mode selection menu <Mode>, press key to select, Enter such as <low range>, press key to confirm. CH01 Copyright © Itech Electronic Co., Ltd.

  • Page 43: Transient Operation

    The transient testing modes have 3 kinds: continuous, pulsed, or toggled.  Continuous: Generates a respective pulse stream the toggles between two load levels  Pulse: Generates a load change that returns to its original state after some Copyright © Itech Electronic Co., Ltd.

  • Page 44: Continuous

    In toggle mode, the electronic load will switch between A level and B level when receiving a triggering signal after the transient operation is enabled. The following picture shows the current waveform in toggle transient operation. Copyright © Itech Electronic Co., Ltd.

  • Page 45: A/B Transient Operations

    2A/uS. Press key to confirm CH01 Fall Speed Set = 2.00A/Us ▼ ▼ Press key to enter A LEVEL setting <TRANa>，such as 10.00A, Enter press key to confirm Transition Level = 10.00A Copyright © Itech Electronic Co., Ltd.

  • Page 46: List Operation

    CURRent:TRANsient:AWIDth 0.6mS CURRent:TRANsent:BLEVel 10 CURRent:TRANsient:BWIDth 0.7mS TRANsient ON TRIGger:IMMediate 4.5 List operation List mode lets you generate complex sequences of input changes with rapid, precise timing, which may be synchronized with internal or external signals. Copyright © Itech Electronic Co., Ltd.
  • Page 47 ▼ ▼ Shift Shift Enter Press +5，press key to select <list>, press key to ▼ ▼ Enter confirm, press key to select List<Edit list>, press key to confirm Function Mode Recall List Edit List Copyright © Itech Electronic Co., Ltd.
  • Page 48 If in the remote control mode（USB / RS232 / GPIB / Ether-net） ，you can refer to the following example to edit list operation (refer to IT8700 programming guide to get more). LIST:MODE CURRent LIST:RANGe 40 LIST:COUNT 10000 LIST:STEP 4 Copyright © Itech Electronic Co., Ltd.

  • Page 49: Triggered Operation

    When in remote control mode （USB / RS232 / GPIB / Ether-net） , you can send SCPI command INPut:SHORt ON to enable the short operation 4.8 Input on/off operation On/Off On/Off In front panel operation conditions, press key to switch to on/off state. Copyright © Itech Electronic Co., Ltd.

  • Page 50: Synchronous Load

    For example, when you test a power supply’s discharging, you can set the start discharge voltage and the end discharge voltage of the power supply. IT8700 series electronic loads offer Von loading voltage and Von loading mode.  When disable Von LATCH, voltage rise and is higher than the Von loading voltage, input of electronic load is turned on.
  • Page 51 Open the load’s input When in remote control mode （USB / RS232 / GPIB / Ether-net） ， you can send SCPI command VOLT:ON <n> to set Von value; send VOLT:LATch ON to enable Von LATCH function. Copyright © Itech Electronic Co., Ltd.

  • Page 52: Protection Functions

    Shift+5>Protect>Point set OPP power value, Plimit set alarm delay. If the load power value is OPP delay time, load will automatically turned off, VFD will display OPP. At the same time, the OP and PS bits in the status register Copyright © Itech Electronic Co., Ltd.

  • Page 53: Over Temperature Protection (Otp)

    Recall Group 4.13 Automatic test Automatic test function of IT8700 series electronic load is very powerful, it can simulate various tests. It can edit up to 10 groups of testing files, each file has 10 steps, it can edit up to 100 files which can be saved in EEPROM (address).
  • Page 54 Set unloading time, if you need 2S, press numeric key 2, then press Enter Enter to confirm SEQ01 Off Time 10. Set testing delay time, e.g. 1S, press numeric key 1. Tpf is testing delay time. SEQ01 P/F Delay Time = 1.0 S Copyright © Itech Electronic Co., Ltd.
  • Page 55 16. Select the channel you want to edit, then edit every group’s every step, we ▼ ▼ ▲ ▲ 、 select channel 3 and channel 5 in above, press keys to switch channels, after selecting channel 3. Setup Setup 17. Press ﹥Mode =CC Range=HIGH Copyright © Itech Electronic Co., Ltd.
  • Page 56 Recall testing files and Run testing files The following way can make you fast recall the edited testing files from EEPROM after re-powering. Shift Shift Press to enter the menu Program Recall Prog Edit Program Exit Copyright © Itech Electronic Co., Ltd.

  • Page 57: Cr-Led Test Function

    Set=7500.0 Enter Esc ▼ ▼ Enter Enter Press key to move to Vd= 0.000V. Press key to confirm. You need to set the Vd value. CR-LED Vdorp= 0.000V Enter 10. Press key to exit Copyright © Itech Electronic Co., Ltd.

  • Page 58: Chapter5 Specifications

    0~3A 0~20A Readback current Resolution 0. 01mA 0.1mA Accuracy ±(0.05%+0.05%FS) Range 250W Readback power Resolution 10mW Accuracy ±(0.2%+0.2%FS) Protection range ≒250W ≒3.3A ≒22A ≒82V ≒85℃ Specification ≒3.3/3A ≒22/20A Current（CC） Voltage（CV） Short-circuit Resistance ≒50mΩ （CR） Copyright © Itech Electronic Co., Ltd.
  • Page 59 Measuring range Range 0~18V 0~80V Readback Resolution 0.1 mV 1 mV voltage Accuracy ±(0.025%+0.025%FS) ±(0.025%+0.025%FS) Range 0~4.5A 0~45A Readback Resolution 0.1mA current Accuracy ±(0.05%+0.05%FS) Range 300W Readback Resolution 10mV power Accuracy ±(0.2%+0.2%FS) Protection range ≒310W Copyright © Itech Electronic Co., Ltd.
  • Page 60 Measuring range Range 0~18V 0~80V Readback Resolution 0.1 mV 1 mV voltage Accuracy ±(0.025%+0.025%FS) ±(0.025%+0.025%FS) Range 0~4A 0~40A Readback Resolution 0.1mA current Accuracy ±(0.05%+0.05%FS) Range 200W Readback Resolution 10mW power Accuracy ±(0.2%+0.2%FS) Protection range Copyright © Itech Electronic Co., Ltd.
  • Page 61 5uS+100ppm Rising/fallin Dynamic g slope 0.0001~0.25A/uS 0.001~2.5A/uS mode Rising ≒15uS ≒15uS time Measuring range Range 0~18V 0~80V Readback Resolution 0.1 mV 1 mV voltage Accuracy ±(0.025%+0.025%FS) ±(0.025%+0.025%FS) Range 0~6A 0~60A Readback current Resolution 0.1mA Copyright © Itech Electronic Co., Ltd.
  • Page 62 0.01%+0.0008S Input voltage 600W CP mode Input current 10mW Input power ±(0.2%+0.2%FS) Dynamic mode CC mode T1＆T2 20uS~3600S /Res:1u S Accuracy 5uS+100ppm Dynamic Rising/falling mode slope 0.0001~0.25A/uS 0.001~2.5A/uS Rising time ≒35uS ≒35uS Measuring range Copyright © Itech Electronic Co., Ltd.
  • Page 63 0.1mA CC mode ±(0.05%+0.05%FS) Accuracy ±(0.05%+0.05%FS) 0.3Ω~10Ω 10Ω~7.5KΩ Range CR mode Resolution 16bit Accuracy 0.01%+0.08S 0.01%+0.0008S Range 250W CP mode Resolution 10mW Accuracy ±(0.2%+0.2%FS) Dynamic mode CC Mode Dynamic mode T1＆T2 20uS~3600S/Res:1uS Accuracy 5uS±100ppm Copyright © Itech Electronic Co., Ltd.
  • Page 64 ±(0.05%+0.025%FS) Range 0~3A 0~20A Resolution 0.1mA CC mode Accuracy ±(0.05%+0.05%FS) ±(0.05%+0.05%FS) 0.25Ω~10Ω 10Ω~7.5KΩ Range CR mode Resolution 16bit Accuracy 0.01%+0.08S 0.01%+0.0008S Input voltage 300W CP mode Input current 10mW Input power ±(0.2%+0.2%FS) Dynamic mode Copyright © Itech Electronic Co., Ltd.
  • Page 65 Range 0~18V 0~500V CV mode Resolution 10mV Accuracy ±(0.05%+0.025%FS) ±(0.05%+0.025%FS) Range 0~3A 0~30A Resolution 0.1mA CC mode Accuracy ±(0.05%+0.05%FS) ±(0.05%+0.05%FS) 0.2Ω~10Ω 10Ω~7.5KΩ Range CR mode Resolution 16bit Accuracy 0.01%+0.08S 0.01%+0.0008S CP mode Range 500W Copyright © Itech Electronic Co., Ltd.

  • Page 66: Supplementary Characteristics

    Storage capacity: 101 sets Suggested calibration frequency: one time each year Cooling style: fan Fans control temperature: Temperature 35° C 50° C 70° C 85° C Fans status The first grade The second grade The third grade Copyright © Itech Electronic Co., Ltd.
  • Page 67 Specifications Copyright © Itech Electronic Co., Ltd.

  • Page 68: Chapter6 Remote Operation

    Parity options are stored in non-volatile memory. Baud rate The front panel <Shift> + <System> key allows the user to select one of the following baud rates, which is stored in non-volatile memory: 4800 9600 19200 38400 57600 115200. Copyright © Itech Electronic Co., Ltd.
  • Page 69 RS-232 connector. Note that even if the cable has the proper connectors for your system, the internal wiring may be incorrect.  The interface cable must be connected to the correct serial port on your computer (COM1, COM2.etc.). Copyright © Itech Electronic Co., Ltd.

  • Page 70: Ether Net Interface

    The USB488 device capabilities of the electronic load are described below：  The device understands all mandatory SCPI commands.  The device is SR1 capable.  The device is RL1 capable.  The device is DT1 capable. Copyright © Itech Electronic Co., Ltd.
  • Page 71 Remote operation NOTE When communicating with PC, you can just select one method of all the communication methods above. Copyright © Itech Electronic Co., Ltd.

  • Page 72: Appendix

    Specifications of Red and Black Test Lines ITECH provides you with optional red and black test lines, which individual sales and you can select for test. For specifications of ITECH test lines and maximum current values, refer to the table below.
  • Page 73 Contact Us Thanks for purchasing ITECH products. In case of any doubts, please contact us as follows: 1. Refer to accompanying data disk and relevant manual. 2. Visit ITECH website: www.itechate.com. 3. Select the most convenient contact method for further information.

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