Safety Summary The following safety precautions apply to both operating and maintenance personnel and must be observed during all phases of operation, service, and repair of this instrument. Before applying power, follow the installation instructions and become familiar with the operating instructions for this instrument.
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WARNING and CAUTION statements, such as the following examples, denote a WARNINGS AND CAUTIONS hazard and appear throughout this manual. Follow all instructions contained in these statements. A WARNING statement calls attention to an operating procedure, practice, or condition, which, if not followed correctly, could result in injury or death to personnel.
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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...
Introduction Description The B&K Precision model 1739 is a high quality, low current DC power source. This power supply provides 0-30 volts dc output, adjustable with both coarse and fine voltage controls for precise settability. The current output is 0-1 amps, adjustable with both coarse and fine current controls.
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Reverse polarity protection prevents accidental damage to the power supply from improper connection to an external device, and current limiting protects the equipment being powered, as well as the power supply. The output is isolated from chassis and earth ground, which permits full flexibility of connections.
Quick Reference 3.1 Front Panel Figure 1 - Front Panel INDICATORS Either the CV or CC LED indicators will be lit whenever the unit is operating. The unit automatically changes from CV to CC operation when the preset current limit is reached.
CURRENT CONTROL 7) Current Coarse Control. Adjusts current limit in constant voltage mode. Adjusts constant current value in constant current mode. Current can be read from the red LED display. 8) Current Fine Control. Adjusts current limit in constant voltage mode. Adjusts constant current value in constant current mode.
Operating Instructions Safety Precautions Use only a polarized 3-wire AC outlet. This assures that the power supply chassis, case, and ground terminal are connected to a good earth ground and reduces danger from electrical shock. There is little danger of electrical shock from the power supply output, which produces a maximum of 30 volts dc.
4.1 Instrument Hook-Up 1. Turn off the power supply and the equipment to be powered during hook- 2. Connect the positive polarity of the device being powered to the red (+) terminal of the power supply. 3. Connect the negative polarity of the device being powered to the black (-) terminal of the power supply.
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Figure 3 (A and B) - Grounding Possibilities Figure 3 (C and D) - Grounding Possibilities...
4.2 Typical Constant Voltage Operation 1. Before connecting the device to be powered to the power supply, determine the maximum safe load current for the device to be powered and set the current limit value (see Setting Current Limit procedure in this section). 2.
4.3 Setting Current Limit 1. Determine the maximum safe current for the device to be powered. 2. Temporarily short the (+) and (-) terminals of the power supply together with a test lead. 3. Adjust the coarse and fine current control for the desired current limit. Read the current value on the current LED display.
4.4 Typical Constant Current Operation Before connecting the device to be powered to the power supply, determine the maximum safe voltage to be applied, and set the voltage controls to obtain that voltage reading on the voltage LED display. Determine the desired constant current value. Set the coarse and fine current control to minimum (1mA).
4.5 Constant Voltage/Constant Current Characteristic The working characteristic of this power supply is called a constant voltage/constant current automatic crossover type. This permits continuous transition from constant current to constant voltage modes in response to the load change. The intersection Figure of constant voltage and constant current modes is called the crossover point.
4.6 Saving the Power Supply’s Current State The current state of the power supply is saved after 2 seconds from the last adjustment or after the “SAVE” command is received through the RS232 interface. 4.7 Connecting Two Power Supplies in Series Two power supplies may be connected in series to provide a variable 0-60 volt output.
4.8 Connecting Two Power Supplies in Parallel Two power supplies may be connected in parallel to double the maximum load current. In this configuration, the two power supplies will provide 0-30 volt output at up to 2 amps. Current equalizing resistors must be used as shown in Figure 9 .
The power supply can be connected to the RS232 interface using the 9-pin (DB-9) serial connector on the rear panel. The 1739 uses a null modem RS232 cable. The cable pin diagram for the DB-9 connector is shown in the picture below:...
5.1 RS232 Configuration Overview Baud Rate 9600 bps Parity Bits none Data Bits Start Bits Stop Bits Flow Control Xon / Xoff Termination Character CR (0x13) Table 1 - RS232 Configuration 5.2 RS232 Commands Note : All commands are case sensitive, therefore be sure all letters are CAPITALIZED before sending it to the instrument.
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CV<CR> if the power supply is in Constant Voltage mode CC<CR> if the power supply is in Constant Current mode 6. OUT ON<CR> Turn output power on. 7. OUT OFF<CR> Turn output power off. 8. IDN?<CR> The power supply responds with: “B+K PRECISION 1739 Revision x.x <CR>”.
Maintenance WARNING The following instructions are for use by qualified personnel only. To avoid electrical shock, do not perform any servicing other than contained in the operating instructions unless you are qualified to do so. 6.1 Fuse Replacement If the fuse blows, the CV or CC indicators will not light and the power supply will not operate.
6.3 Calibration Calibration is a procedure that ensures that the power supply will work properly, with parameters specified within the Specifications section. Before initiating the calibration procedure, the following conditions must be assured: • Disconnect any loads connected to the power supply and turn it on •...
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0 Low current calibration F Full current calibration The voltage coarse and fine and current fine knobs are not used. Important note! In order to perform a correct calibration procedure, you must select the full voltage calibration option just after the zero voltage calibration option, and the full current calibration option just after the low current calibration option.
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3. Full voltage calibration To finish the voltage calibration procedure, the full voltage calibration must be done after the zero voltage calibration. a) Select “U F” for full voltage calibration and turn the voltage coarse knob. The power supply will display: Voltage display: Current display: hex number A hexadecimal number between 0 and FFFFh will be shown on the current...
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b) Connect a digital ammeter (B&K Precision 5491B or similar instrument) to the output terminals of the power supply to initiate the zero current calibration procedure. If a digital ammeter is not connected within 30 seconds, the power supply will abandon the current calibration procedure and return to the Calibration menu.
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Connect a digital ammeter (BK Precision 5491B or similar instrument) to the output terminals of the power supply to initiate the full current calibration procedure. If a digital ammeter is not connected within 30 seconds, the power supply will abandon the current calibration procedure and will return to the Calibration menu.
6.4 Instrument Repair Service Because of the specialized skills and test equipment required for instrument repair and calibration, many customers prefer to rely upon B&K Precision for this service. We maintain a network of B&K Precision authorized service agencies for this purpose.
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Er 20: CC not high Er 21: CV not low Er 22: DAC out of range Er 23: ADC out of range Er 24: ADC system calibration failed Er 25: DAC zero voltage constant checksum failed Er 26: ADC zero voltage constant checksum failed Full voltage calibration errors: Er 30: CC not high Er 31: CV not low...
“Syntax Error<CR>” : invalid syntax was found in the command string “Out of range<CR>” : a numeric parameter value is outside the valid range for the command Specifications 1739 Output Ratings ( 0 °C~40 °C) 0-30 V Voltage 0-999.9 mA Current Load Regulation ±(% of output+offset)
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NOTE: All specifications apply to the unit after a temperature stabilization time of 30 minutes. Specifications and information are subject to change without notice. To ensure the most current version of this manual, please download the current version here: http://www.bkprecision.com/search/manual/1739 For current up-to-date product information, please visit www.bkprecision.com...
Service Information Warranty Service: Please go to the support and service section on our website at www.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.
10 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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