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Summary of Contents for BK Precision 8550 Series
- Page 2 Safety Summary The following safety precautions apply to both operating and maintenance personnel and must be followed during all phases of operation, service, and repair of this instrument. Before applying power to this instrument: • Read and understand the safety and operational information in this manual. •...
- Page 3 Electrical Power This instrument is intended to be powered from a CATEGORY II mains power environment. The mains power should be 115 V RMS or 230 V RMS. Use only the power cord supplied with the instrument and ensure it is appropriate for your country of use. Do not use this instrument in an electrical environment with a higher category rating than what is specified in this manual for this instrument.
- Page 4 Environmental Conditions This instrument is intended to be used in an indoor pollution degree 2 environment. The operating temperature range is 0 C to 40 C and 20% to 80% relative humidity, with no condensation allowed. ∘ ∘ Measurements made by this instrument may be outside specifications if the instrument is used in non- office-type environments.
- Page 5 Do not operate instrument if damaged If the instrument is damaged, appears to be damaged, or if any liquid, chemical, or other material gets on or inside the instrument, remove the instrument’s power cord, remove the instrument from service, label it as not to be operated, and return the instrument to B&K Precision for repair.
- Page 6 Do not touch live circuits Instrument covers must not be removed by operating personnel. Component replacement and internal adjustments must be made by qualified service-trained maintenance personnel who are aware of the hazards involved when the instrument’s covers and shields are removed.
- Page 7 Servicing Do not substitute parts that are not approved by B&K Precision or modify this instrument. Return the instrument to B&K Precision for service and repair to ensure that safety and performance features are maintained. Fuse replacement must be done by qualified service-trained maintenance personnel who are aware of the instrument’s fuse requirements and safe replacement procedures.
- Page 8 Compliance Statements Disposal of Old Electrical & Electronic Equipment (Applicable in the European Union and other European countries with separate collection systems) This product is subject to Directive 2002/96/EC of the European Parliament and the Council of the European Union on waste electrical and electronic equipment (WEEE), and in jurisdictions adopting that Directive, is marked as being put on the market after August 13, 2005, and should not be disposed of as unsorted municipal waste.
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Page 9: Table Of Contents
Contents Introduction Product Overview Contents Features Dimensions Front Panel Rear Panel Getting Started Preliminary Information Input Power and Fuse Requirements Fuse Replacement Basic Front Panel Operation Function Keys 3.1.1 Mode Key 3.1.2 System Key 3.1.3 Short Key 3.1.4 Lock/Local Key & Screenshots Softkeys Modes Static Mode... - Page 10 Over-Current Protection Test (OCPT) Over-Voltage Protection Test (OVPT) Over-Power Protection Test (OPPT) 4.10 Load Regulation Mode 4.11 Sweep Mode 4.12 Automatic Test Mode System System Configuration 5.1.1 Language 5.1.2 Beep Sound 5.1.3 Sense 5.1.4 Power-On 5.1.5 Display 5.1.6 Source 5.1.7 External Programming Von/Voff Protect...
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Page 11: Introduction
The DC load is remotely programmable via the RS 232 serial interface. The serial interface uses a standard 9 pin D type connector. For more information see section RS 232 Interface. The 8550 Series also provides a handler. This interface can be used to receive external trigger signals, control signals, and output of instrument sorting results. -
Page 12: Contents
Introduction 1.2 Contents Please inspect the instrument mechanically and electrically upon receiving it. Unpack all items from the shipping carton, and check for any obvious signs of physical damage that may have occurred during transportation. Report any damage to the shipping agent immediately. Save the original packing carton for possible future reshipment. -
Page 13: Dimensions
Introduction 1.4 Dimensions Model 8550 8551 Dimensions 9.29” x 4.37”x 17.87” (236 x 111 x 454 mm) (W x H x D) Weight 6.61 lb. (3 kg) 10.58 lb. (4.8 kg) Table 1.2 Dimensions and Weight Figure 1.2 Dimensions... -
Page 14: Front Panel
Introduction 1.5 Front Panel Figure 1.3 Front Panel Item Name Description Power Button Toggles the instrument ON or OFF. Function Keys section 3.1 for details. USB Host Port USB port used to connect flash drives. Display Visual presentation of the device function and measurements. Navigation Used to navigate menus or configure parameters. -
Page 15: Rear Panel
Introduction 1.6 Rear Panel Figure 1.4 Rear Panel Item Name Description Input Voltage Switch Switch between 110/220V±10% AC input. AC power input Houses the IEC 320 connector. Connect an external voltmeter or oscilloscope to display the input’s Current Monitoring current. Connect a cable with a two COM interface (DB9) to remotely control RS232 Interface the unit. -
Page 16: Getting Started
Getting Started Preliminary Information Input Power and Fuse Requirements Fuse Replacement 2.1 Preliminary Information Before getting started, please inspect the instrument mechanically and electrically upon receiving it. Unpack all items from the shipping carton, and check for any obvious signs of physical damage that may have occurred during transportation. - Page 17 Getting Started Safety Requirements Under the referenced working condition: • The insulation resistance between the power terminal and the shell must not be less than 50 M. • During transportation the insulation resistance between the power terminal and the housing must not be less than 2 M.
- Page 18 Getting Started 2.3 Fuse Replacement The fuse is accessible through the rear panel beneath the Input Voltage Switch. Table 2.1shows the fuse requirements. Rating Fuse Specification 110 V / 60 Hz T2AL 220 V / 50 Hz T1AL Table 2.1 Fuse Specification No power should be applied to the instrument while replacing the fuse.
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Page 19: Basic Front Panel Operation
Basic Front Panel Operation Function Keys 3.1.1 Mode Key 3.1.2 System Key 3.1.3 Short Key 3.1.4 Lock/Local Key & Screenshots Softkeys At power-on, the instrument will automatically enter the Static submenu where the core operation modes (CC, CV, CR, and CW) can be selected. -
Page 20: Function Keys
3.1 Function Keys The Function Keys consist of Mode, System, Short, and Lock/Local. 3.1.1 Mode Key The Mode Key enters the Operation Modes menus. (Figure 3.1) The 8550 Series supports the following modes: Menu 1/3 Menu 2/3 Menu 3/3 • Static •... -
Page 21: System Key
For more details on each submenu click on the corresponding submenu. 3.1.3 Short Key The 8550 Series can simulate a short-circuit at the input. This allows for a short-circuit load test up to the maximum current range of the load. -
Page 22: Lock/Local Key & Screenshots
Basic Front Panel Operation 3.1.4 Lock/Local Key & Screenshots The Lock/Local key toggles the instrument between remote (lock) and local mode. While in remote mode all front panel keys except for Lock/Local and Enter are unavailable and the LED corresponding to the Lock/Local key is illuminated. -
Page 23: Modes
Modes The 8550 series integrates the following modes: Static Mode 4.1.1 Constant Current 4.1.2 Constant Voltage 4.1.3 Constant Resistance 4.1.4 Constant Power Transient Mode 4.2.1 Continuous 4.2.2 Pulse 4.2.3 Toggle List Mode 4.3.1 Continuous List Operation 4.3.2 Count List Operation 4.3.3... -
Page 24: Static Mode
Modes 4.1 Static Mode Static mode includes the main four functions of the DC load; constant current (CC), constant current (CC), constant resistance (CR), and constant power (CW). Once in Static mode, select the desired function by pressing the corresponding softkey. The parameters in the Load Settings tab will change accordingly to the selected operating mode. -
Page 25: Constant Current
Modes 4.1.1 Constant Current In constant current mode, the load will sink a current in accordance with the programmed value regardless of the input voltage. Figure 4.2 CC Mode Configure CC Parameters There are several parameters that must be setup properly to operating in CC mode. These parameters are accessible once CC is selected. -
Page 26: Constant Voltage
Modes 4.1.2 Constant Voltage In constant voltage mode the load will sink enough current to control the DUT voltage to the programmed value. The load acts as a shunt voltage regulator when operating in CV mode. Figure 4.3 CV Mode Configure CV Parameters There are several parameters that must be setup properly to operating in CV mode. -
Page 27: Constant Resistance
Modes 4.1.3 Constant Resistance In constant resistance mode the load will sink a current linearly proportional to the voltage in accordance with the programmed resistance value. Figure 4.4 CR Mode Configure CW Parameters There are several parameters that must be setup properly to operating in CV mode. These parameters are accessible once CR is selected. -
Page 28: Constant Power
Modes 4.1.4 Constant Power In constant power mode the load will maintain the input power at the specified programmed power level. The load has an independent power loop that regulates the input power at the limit setting (175 for model 8550 and 350 for model 8551). Figure 4.5 CW Mode Configure CW Parameters There are several parameters that must be setup properly to operating in CV mode. -
Page 29: Transient Mode
Modes 4.2 Transient Mode Transient operation enables the module to periodically switch between two load levels. This function allows for dynamic characteristics of power supplies or other DC sources. Transient testing can be used to check the stability of the source voltage. Transient functions have two current levels denoted as Level-A and Level-B, which must be in the same range 6 A or 60 A. -
Page 30: Pulse
Modes 4.2.2 Pulse Generates a transient pulse of programmable width when pulse transient operation is in effect. In pulse mode the electronic load will automatically switch to B level. After maintaining B width time, it will switch to A level. The electronic load will not switch to B level again until the instrument receives a trigger signal. -
Page 31: List Mode
Modes 4.3 List Mode List mode allows the user to generate complex sequences of input changes with rapid, precise timing. This is useful when running test sequences with a minimum amount of programming overhead. List steps are continuously loaded according to the sequence edited in the list file. The load supports up to 10 files, each containing up to 100 steps. -
Page 32: Step List Operation
Modes 4.3.3 Step List Operation When list is set to step the next step will not load automatically. Once the dwell time of the step elapses the instrument will remain in that step until a trigger signal is received. Triggering after the last programmed step in the file has elapsed will loop the file back to step 1. -
Page 33: File Configuration
Modes 4.3.4 File Configuration Pressing Mode > F3 > F1 will display the List Edit menu figure 4.11. Figure 4.11 File Configuration In the List Edit menu the user can; insert, add, copy, paste, delete, and edit steps. Each step has 3 configurable parameters: Current, Dwell, and slew. -
Page 34: Cr-Led Mode
Modes 4.4 CR-LED Mode To enter CR-LED mode press Mode > F4. Figure 4.12 CR-LED Menu CR LED allows the instrument to simulate the loading behavior of typical LEDs, which can be used for testing LED drivers. When the function is enabled, the load allows the user to configure the LED’s operating resistance and forward voltage along with the voltage range (same as CR operation). -
Page 35: Battery Test Function
The use CR-LED mode only Vo, Io, and Rd Coeff have to be entered. 4.5 Battery Test Function The 8550 series has a built-in battery test function that supports: CC, CR, and CW mode. Figure 4.14 Battery Mode Each mode supports the following stop conditions:... - Page 36 Modes During operation, the load operates at the specified level according to the selected operation mode, while measuring and updating the capacity value in both amp-hours (Ah) and watt-hour (Wh). The load will also track the test’s run time. When the selected stop condition meets the specified level the test will end. To setup the battery test function: Step 1.
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Page 37: Time Test
Modes 4.6 Time Test The 8550 series provides a time test function with a test accuracy of .1 ms (100 μ To enter the Time Test operation mode press Mode > F6 > F1. Figure 4.15 Time Test Mode The load is measured according to the predetermined loading conditions, and the time interval is calculated according to the start and stop condition values. -
Page 38: Over-Current Protection Test (Ocpt)
Modes 4.7 Over-Current Protection Test (OCPT) The 8550 series provides the over-current protection test function. The principle is shown in figure 4.16. Figure 4.16 OCPT Operation The load starts from the initial current (I-Start) and gradually increases the current to the cut-off current (I-End) according to the set number of steps (Steps). - Page 39 Modes Figure 4.17 OCPT Mode As show in 4.17, during this process, the load not only detects the OCP protection point, but also figure captures the power of the maximum power point, Voltage and current values. Description Parameters I-Start Sets a start current level. The load will sink this current when the test is initiated. Sets a stop current level.
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Page 40: Over-Voltage Protection Test (Ovpt)
Modes 4.8 Over-Voltage Protection Test (OVPT) The 8550 series provides the over-voltage protection test function. The principle is shown in figure 4.18. Figure 4.18 OVPT Operation The load captures the peak point and the falling edge of the input voltage. Once the falling edge reaches the set V-Trig value the timer is stopped and the response time is saved as Tovp. -
Page 41: Over-Power Protection Test (Oppt)
Modes 4.9 Over-Power Protection Test (OPPT) The 8550 series provides the over-power protection test function. The principle is shown in figure 4.19. Figure 4.19 OPPT Operation The load starts from the initial power (P-Start) and gradually increases the power to the cut-off power (P-End) according to the set number of steps (Steps). -
Page 42: Load Regulation Mode
Modes 4.10 Load Regulation Mode The 8550 series provides the load regulation function. During the test, the load will be loaded under 3 different load currents, the minimum current (I-Min), the normal current (I-Normal) and the maximum current (I-Max). Each load value will be tested for a preset time (Delay). The voltage value under different loads is... -
Page 43: Sweep Mode
Modes 4.11 Sweep Mode Sweep mode can be used to captures the Vp+ and Vp- of the power supply when tested for worst case scenario. The load is switched repeatedly between two current loads according to the preset current slope. The duration of each current level will be determined by the scan frequency and duty ratio (Duty). The sweep frequency will gradually increase or decrease from the start frequency (Fstart). -
Page 44: Automatic Test Mode
Modes 4.12 Automatic Test Mode The automatic test function is used to inspection the production line. The loaded runs a sequence according to the steps edited in the selected file. The pass or fail is automatically determined based on the preset condition values. The load supports up to 10 files, each file supports up to 50 steps of testing, and each step can set the loading conditions and limit judgment. - Page 45 Modes • The parameters for each mode varies. Please review the section corresponding to each mode for more information. Step 6. Configure the test conditions. • Set the Limit type. • Set the limit values Upper and Lower limit. • Set the Fail Operation action.(Abort the test or continue) •...
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Page 46: System
System The following instrument’s parameters can be configured from the system menu: System Configuration 5.1.1 Language 5.1.2 Beep Sound 5.1.3 Sense 5.1.4 Power-On 5.1.5 Display 5.1.6 Source 5.1.7 External Programming Von/Voff Protect 5.3.1 Over-Voltage Protection 5.3.2 Over-Current Protection 5.3.3 Over-Power Protection 5.3.4 Delay File Store... -
Page 47: System Configuration
All setup procedures and settings explained in this section can be accessed from the System Configuration menu. To access this menu, press System > F1. 5.1.1 Language The 8550 series support English and Chinese. English is the default language. 5.1.2 Beep Sound Enable/Disable the key sound. -
Page 48: Display
System 5.1.5 Display During the operation of the load, the user can choose to display certain parameters or block some parameters in the data sampling display area. U, I, P, PPon Figure 5.2 U, I, P, PPon U, I, P, PPoff Figure 5.3 U, I, P, PPoff... -
Page 49: Source
System U, I, P, R Figure 5.4 U, I, P, R 5.1.6 Source Set the output type of the DUT in advance. This is crucial for CR, CP and other modes. CC: The DUT is a constant current source. CV: The DUT is a constant voltage source. 5.1.7 External Programming Enable/Disable the external analog programming. -
Page 50: Protect
System 5.3 Protect The electronic load has the following protection functions: Overvoltage protection (OVP), overcurrent protection (OCP), and overpower protection (OPP). The instrument will act appropriately once any of the above protections are active. You can press the enter button on the front panel to restore the protection function. For example, if the electronic load triggers the overvoltage protection, the buzzer will alarm, the input will automatically turn off, and a notification indicating over volt will be displayed. -
Page 51: File Store
System 5.4 File Store The instrument can save the current parameter settings and configuration of the load in flash. To save the current parameters: Step 1. Press System > F4 to enter the File Store menu. Step 2. Select in what memory the file will be saved. Internal File (F1) or External File (F2) Step 3. -
Page 52: Communication Setup
System 5.5 Communication Setup The 8550 series supports remote communication over the RS232 interface. The parameters of the interface can be configured in the Communication Setup menu. The following parameters are supported. Baud rate : 4800, 9600, 19200, 38400, 115200... -
Page 53: Limit
System 5.6 Limit Sets the pass and fail parameters for the voltage, current, and power input. Each parameter consist of 3 parts; Trigger state, lower value, and upper value. The trigger state determines if the instrument reports a fail input. If trigger status is set to On the buzzer will inform the user whenever the input fails to meet the specified lower or upper value. -
Page 54: Handler
Handler The 8500 series provides a HANDLER interface. The handler can be used to receive external trigger signals, control signals, and output a signal for sorting results. Figure 6.1 Handler Pinout Function Description DGND Digital ground(chassis ground) External ON/OFF control signal, low pulse is effective TRIG External trigger signal, low pulse is effective AGND... -
Page 55: On Function
Handler 6.1 ON Function This interface function is equivalent to the front panel ON/OFF key, and the low pulse signal is effective. When a low pulse signal is received, the load sinks current and the ON/OFF button LED lights up. When the low pulse signal is received again, the load stops sinking current and the ON/OFF button LED is disabled. - Page 56 The load will automatically adjust the slew rate to fit within the range (high or low) that is closest to the programmed value. Ordering Information (3) Accuracy typical. Applies to supplementary V , and P measurements. 8550 Series Programmable DC Electronic Loads Model Description 8550 150 V / 30 A, 175 W 8551...
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Page 57: Service Information
Service Information Warranty Service: Please go to the support and service section on our website at bkprecision.com to obtain an RMA #. Return the product in the original packaging with proof of purchase to the address below. Clearly state on the RMA the performance problem and return any leads, probes, connectors and accessories that you are using with the device. -
Page 58: Limited Three-Year Warranty
LIMITED THREE-YEAR WARRANTY B&K Precision Corp. warrants to the original purchaser that its products and the component parts thereof, will be free from defects in workmanship and materials for a period of three years from date of purchase. B&K Precision Corp. will, without charge, repair or replace, at its option, defective product or component parts.
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