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Technical content
8500 Series
Versatile & Economical DC Electronic Loads The 8500 series Programmable DC Electronic Loads can be used for testing and evaluating a variety of DC power sources. Their wide operating ranges of up to 500 V and 240 A, flexible operating modes and excellent measurement accuracy make the 8500 series well suited for characterizing DC Power supplies, DC -DC Converters, batteries, fuel cells and solar cells. The loads can operate in CC, CV , CR or CP mode while voltage/current or resistance/power values are measured and displayed in real time. Load terminals are isolated and floating. Over temperature, over power, over voltage, over current and reverse polarity protection will help protect your valuable prototype and circuits. The DC loads are easy to use. All parameters can be set quickly and precisely from the front panel, or programmed via USB interface. Technical data subject to change © B&K Precision Corp. 2018 Data Sheet www.bkprecision.com The 8500 family offers 10 models with a wide range of ratings When selecting a DC load, it is important to consider not only voltage and current requirements, but also power ratings. The power used when testing must fall within the hatched region for the appropriate DC load. Some applications may require high voltage/low current and low voltage/high current which a single load may not be able to handle. B&K Precision’s broad range of DC loads will allow you to select the optimal model for your requirements. 2400W 600 W - 1200 W 300 W Input current Rated power Input voltage Model Power Operating Voltage Rated Current 8500 300 W 0.1 - 120 V 30 A 8502 300 W 0.1 - 500 V 15 A 8510 600 W 0.1 - 120 V 120 A 8512 600 W 0.1 - 500 V 30 A 8514 1200 W 0.1 - 120 V 240 A 8518 1200 W 0.1 - 60 V 240 A 8520 2400 W 0.1 - 120 V 240 A 8522 2400 W 0.1 - 500 V 120 A 8524 5000 W 0.1 - 60 V 240 A 8526 5000 W 0.1 - 500 V 120 A
www.bkprecision.com DC Electronic Loads
Features
I Constant current (CC), resistance (CR), voltage (CV) and power (CP) operation IWide voltage and current range, 0 to 500 V , 0 to 240 A (5000 W max) ILow minimum operating voltage of < 0.1 V and minimum input resistance of 5 mΩ(model 8518) allowing the load to sink high current at low voltages, required for fuel and solar cell
applications
ISelected models operate up to 500 V , suitable for high voltage applications IBuilt-in transient generator IShort circuit test IBuilt-in high resolution (0.1 mA/1 mV) voltage and current measurement (models 8500 & 8502) IBright, easy to read display (VFD technology) IOver-Current/Over-Voltage/Over-Power/Over- T emperature Protection IUSB to TTL serial converter cables and application software included IList mode operation for increased throughput. IBattery testing mode to provide A*hr rating of battery (ending voltage level is adjustable) IFlexible triggering: Create trigger events by front panel keystroke, back panel TTL signal, or software IRemote voltage sensing to compensate for the effect of voltage drop in wires. IStore 25 instrument setups IThermostatically-controlled fans allow operation in quiet environments with minimal disruption IAll models are rack mountable. Compact 300 W and 600 W models for bench use Applications: IDC power supply testing ICharacterization of rechargeable batteries. A battery test mode is provided that will measure the ampere*hour (A*hr) characteristic of a battery IFuel and solar cell test IHigh voltage applications Low voltage operation The 8500 series can operate well below 1 V which is important for low voltage application such as fuel cell and solar cell testing. All models can regulate (provide a stable input) down to 0.1 V . Model 8518, due to its particularly low input resistance, can operate at full scale current of 240 A at 1.2 V (see image) Typical minimum operating voltage at full scale current: 8500 8502 8510 8512 8514 8518 8520 8522 8524 8526
www.bkprecision.com DC Electronic Loads 1) A ir vents T emperature-controlled fan expels air through these vents to keep the temperature constant inside the system. 2 ) Trigger and rem ote sensing term inal block Connect sensing lines to this terminal to compensate for voltage drops due to load wire resistance. This terminal block also contains the two connections for the remote TTL trigger input signal. Front panelL 1 2 3 4 5 The numeric keys and rotary knob provide a convenient interface for setting the operating mode and desired current/voltage/resistance levels quickly and precisely. Voltage and current can be set to a maximum resolution of 1 mV and 0.1 mA respectively (models 8500 and 8502 only). Up to 25 different instrument setups can be stored and recalled from internal memory. 1) H igh resolution, easy to read display Displays set values and measured values. Current/voltage and power/resistance displays can be toggled. Display resolution for current and voltage is user-selectable. Maximum resolution for model 8500 and 8502 is 1 mV/ 0.1 mA. 2 ) C onvenient data entry Rotary knob for quick analog-style control. T urn to adjust a setting value. Press to toggle measurement display mode. 3) N um eric keypad Conveniently enter set values directly and access secondary functions. 4 ) Function keys Activate current, voltage, power, or resistance modes and scroll through menus and options. 5 ) Front panel load term inals Connect to device under test. Hex-head screw Hex-head screw terminals 3) Interface connection Serial interface connector for USB communication. 4 ) Voltage sw itch Line voltage selection switch (110 VAC or 220 VAC). T erminals are used for models 8518 and 8520 – 8526 to connect wires. 3 4
www.bkprecision.com DC Electronic Loads C C , C R , C V and C P m ode In Constant Current (CC) mode, the load will sink a current according to the programmed current value regardless of the input voltage. (CC) mode can be used for load regulation testing of DC power supplies or for characteriz- ing the discharge profile of a battery. Constant Power (CP) mode simulates a load whose power consumption is independent of the applied voltage. Constant Power (CP) mode is useful for battery testing and simulating a realistic discharge curve. In Constant Voltage (CV) mode, the load will attempt to sink enough current to control the source voltage to the programmed value. This mode is suitable for testing battery chargers. In Constant Resistance (CR) mode, the load will sink a current linearly proportional to the input voltage in accordance with the programmed Flexible operating modesL Remote control & application softwareL resistance. Unlike conventional resistors, the load resistance stays constant regardless of the power level. Transient generator The 8500 series offers a variable frequency generator which can be used in all operating modes. The DC load will toggle between 2 preset levels at a frequency between 0.1 Hz to 1 kHz, either continuously or controlled by a trigger. Triggered operation Triggering is used to allow synchronization of the DC Load's behavior with other events. You can generate a trigger event by front panel keystroke, by applying an external TTL signal to the back panel terminal or by sending a commands over the serial bus. The trigger can be used in pulse mode, transient mode, list mode and works in CC, CR, CV and CP modes. The DC loads can be remotely controlled from any PC with USB interface, allowing the user to fully program and monitor all parameters. USB to TTL serial converter cables are included. For users wanting to write their own custom software, a set of example programs are available for download on the B&K Precision website. List Mode A list of command sequences can be stored in non-volatile memory and executed independently of a computer. Execution in list mode greatly reduces command processing time and computer interaction during product testing. The command sequence can be entered manually from the front panel or downloaded from a PC via USB interface. A pplication Softw are The included Application Software supports front panel emulation of the load and includes a battery test application which provides A*hr rating of a battery and adjustable ending voltage levels (safety voltage). Whether you are designing a device with Nickel-Metal Hydride or Lithium-Ion batteries, the 8500 series have the capabilities to test their characteristics. An example of battery discharge characteristics of an AA alkaline battery. Model 8500
w w w .bkprecision.com D C Electronic Loads M odels 8500 & 8502 (300 W ) L M odels 8510/8512/8514/8518 (600 W & 1200 W ) L M odels 8520/8522/8524/8526 (2400 W & 5000 W ) L Param eter Range A ccuracy Resolution 8500 8502 C V M ode Regulation 0.1 – 12 0 V 0.1 – 5 00 V ± (0.05 % + 0.02 5 % FS) 10 m V C C M ode Regulation 0 – 30 A 0 – 15 A ± (0.2 % + 0.15 % FS) 1 m A C urrent M easurem ent 0 – 30 A 0 – 15 A 85 00: ± (0.2 % + 0.15 % FS) Voltage M easurem ent 0-18 V ± (0.02 % + 0.02 % FS) 1 m V 0-12 0 V 0 – 5 00 V ± (0.02 % + 0.02 5 % FS) 10 m V Param eter 8510 8512 8514 8518 Input rating Voltage 0 – 12 0 V 0 – 5 00 V 0 – 12 0 V 0 – 60 V C urrent 0 – 12 0 A 0 – 30 A 0 – 2 4 0 A 0 – 2 4 0 A Power 600 W 12 00 W Param eter 8520 8522 8524 8526 Input rating Voltage 0 – 12 0 V 0 – 5 00 V 0 – 60 V 0 – 5 00 V C urrent 0 – 2 4 0 A 0 – 12 0 A 0 – 2 4 0 A 0 – 12 0 A Power 2 4 00 W 5 000 W Param eter 8500 8502 Input rating Voltage 0 – 12 0 V 0 – 5 00 V C urrent 0 – 30 A 0 – 15 A Power 300 W Param eter Range A ccuracy Resolution 8510 8512 8514 8518 C V M ode Regulation 0.1 V to Vm ax ± (0.05 % + 0.02 5 % FS) 10 m V C C M ode Regulation 0-12 A 0-3 A 0-2 4 A ± (0.1% + 0.1% FS) 1 m A 0 – m ax C urrent ± (0.2 % + 0.15 % FS) 10 m A C urrent M easurem ent 0-12 A 0-3 A 0-2 4 A ± (0.1% + 0.1% FS) 1 m A 0 – m ax. C urrent ± (0.2 % + 0.15 % FS) 10 m A Voltage M easurem ent 0 – 18 V 85 10/85 14 : (0.02 % + 0.02 5 % FS) 85 12 /85 18: (0.02 % + 0.02 % FS) 1 m V 0 - Vm ax ± (0.02 % + 0.02 5 % FS) 10 m V Param eter Range A ccuracy Resolution 8520 8522 8524 8526 C V M ode Regulation 0.1 V to Vm ax ± (0.05 % + 0.02 5 % FS) 10 m V C C M ode Regulation 0-2 4 A 0-12 A 0-2 4 A 0-12 A ± (0.1% + 0.1% FS) 1 m A 0 – m ax C urrent ± (0.2 % + 0.15 % FS) 10 m A C urrent M easurem ent 0-2 4 A 0-12 A 0-2 4 A 0-12 A ± (0.1% + 0.1% FS) 1 m A 0 – m ax. C urrent ± (0.2 % + 0.15 % FS) 10 m A Voltage M easurem ent 0 – 18 V 85 2 2 /85 2 6: (0.02 % + 0.02 % FS) 85 2 0/85 2 4 : (0.02 % + 0.02 5 % FS) 1 m V 0 - Vm ax ± (0.02 % + 0.02 5 % FS) 10 m V Specifications
www.bkprecision.com DC Electronic Loads Standard Power cord, user manual, installation CD with application software, USB to TTL serial converter IT -E132B, certificate of calibration and test report Optional Rack mount kit IT -E151 for models 8500, 8502, 8510, 8512, 8514 and 8518 only Model Dimensions (W x H x D) Weight 8510 17.3” x 3.46” x 18.07” (439.6 mm x 88 mm x 459 mm) 31 lb (14 kg) 8512 17.3” x 3.46” x 18.07” (439.6 mm x 88 mm x 459 mm) 31 lb (14 kg) 8514 17.3” x 3.46” x 18.07” (439.6 mm x 88 mm x 459 mm) 31 lb (14 kg) 8518 17.3” x 3.46” x 18.07” (439.6 mm x 88 mm x 459 mm) 31 lb (14 kg) 8520 17.64” x 7.28” x 21.19” (448 mm x 185 mm x 538.2 mm) 66 lb (30 kg) 8522 17.64” x 7.28” x 21.19” (448 mm x 185 mm x 538.2 mm) 66 lb (30 kg) 8524 17.54” x 14.06” x 20.94” (445.5 mm x 357 mm x 532 mm) 148 lb (67 kg) 8526 17.54” x 14.06” x 20.94” (445.5 mm x 357 mm x 532 mm) 148 lb (67 kg) Parameter Range Accuracy Resolution CR Mode Regulation (Input current ≥FS 10% Input voltage≥FS 10%) CW Mode Regulation (Input current ≥FS 10% Input voltage≥FS 10%) 100 W - max power ±(1%+0.1% FS) 100 mW Power Measurement (Input current ≥ FS 10% Input voltage ≥ FS 10%) 100 W - max power ±(1%+0.1% FS) 100 mW Other Battery testing function Input = 0.1 V – 120 V , Max measurement capacity = 999 Ah Resolution = 10 mA, Timer range = 1-60000 sec Transition mode Range of Frequency 0.1 Hz-1 kHz, Frequency error rate□0.5% * All 8500 series models, with the exception of models 8524 and 8526, can be configured for 110 V or 220 V operation via the AC line switch in the rear panel. Base models 8524 and 8526 operate with 110 V only. For 220 V operation, order model 8524-220V or 8526-220V respectively. “-220V” denotes 220 V operation only and these models cannot be reconfigured for 110 V operation. Mechanical specifications Accessories AC input 110 / 220 (see note below)* VAC ± 10%, 47 – 63 Hz Operating temperature 32 ºF - 104 ºF (0 - 40 ºC) Storage temperature 50 ºF - 140 ºF (10 - 60 ºC) Humidity ≤ 95% relative humidity, non-condensing Safety EN61010-1:2001, EU Low Voltage Directive 73/23/EEC amended by 93/68/EEC Electromagnetic compatibility Meets EMC Directive 89/336/EEC amended by 93/68/EEC, EN50081-1, EN50082-1 One-Year Warranty L L