User's Guide Programmable DC Power Supply 200 Watt (40 Volts / 5 Amps) Model 382280 382280
Introduction Congratulations on your purchase of the Extech 382280 Programmable DC Power Supply. This 200 watt power supply offers an adjustable 5ADC / 40VDC output plus fixed outputs (5VDC and 3.3VDC). Programming features include custom over-voltage/current protection with delay timer, 199-test storage, and automated testing. Careful use of this power supply will provide years of reliable service.
Front Panel Description 1. OPER/STBY: Operation/Standby button. Press to enable/disable the output. When the supply is in the 2. 3. 4. 5. 6. 7. 8. 9. STANDBY mode the output is 0 volts. RECALL: Press to call up stored output sets or to activate Automatic Test Sequencing. STORE: Press to save the present V/A output set to memory. Use the numeric keys (not the arrows) to select a storage location from 000 to 199 and then press ENTER. SEC (Seconds): Press to enter time in seconds.
Operation Preparation for use 1. Place the supply on a flat level surface. 2. Select the input voltage using the switch on the rear of the supply (see diagram above). 3. Make sure the sides and the back of the unit are not blocked. Leave at least 2” (5 cm) of space for good ventilation. Line Voltage Selector Switch Basic Test Setup Diagram Setting and Outputting Voltage and Current NOTE: The 3.3V and 5V fixed outputs are always active when power is turned on.
Over Voltage Protection (OVP) Over Voltage Protection (OVP) allows the user to set a maximum permissible output voltage If the voltage limit is exceeded, the unit will display “OVP” and revert to the STBY mode. Note: The OVP is always active. To be able to set the output voltage to 40V, you must set the OVP to 40V. Setting the Over Voltage Protection (OVP) value 1. In the STBY mode, press the OVP key, “?_” appears in the display. 2. Enter a value from the keypad (range of 0.001 to 40V). 3.
Automated Testing Storing Test Setups 1. Set the Voltage and Current values as desired. 2. Press the SEC button and set the time in seconds (1 to 600 seconds). This time will be associated with this step. You need to set the time for each step. Note: The user should set SEC at a minimum of 1 second for the Auto-Step function. If Auto-Step and OCP are enabled at the same time, the value of SEC will be used for the Auto-Step function, while the time duration for OCP will be fixed at 0.01 seconds. 3.
RS-232 PC Communications Interface RS-232 data format Baud rate 9600 Parity none Data bits 8 Stop bits 1 Flow control none RS-232 Connection Connect the supplied communications cable to the rear of the power supply and to the communications port of the PC.
Example of an RS-232C Program V 20.5 : program 20.5V A 1.25 : program 1.25A V 30 A 2 SEC 20 : program 30V, 2A, for 20 seconds OVP 35 : set 35V for the over voltage protection SEC 60 : enter 60 seconds OCP 0 : disable OCP (Open circuit protection) OCP 1 : enable OCP STORE 120 : store current V/A values in memory location 120. RECALL 100 : recall V and A values stored in memory location 100. RECALL 110 : recall V and A values stored in memory location 110.
Specifications Programmed Voltage and Current (after 5-minute warm-up) Range 0 to 40V 0 to 5A Voltage V (C.V.) Current A (C.C.) Resolution 1mV 1mA Accuracy 0.05% ± 9mV 0.2% ± 9mA Voltage and Current Display (Read back) Voltage V (C.C.) Current A (C.V.) Range 0.1 to 40V 0.05 to 5A Resolution 1mV 1mA Display Backlit Dot Matrix (2-line) Display Programmable Voltage Output 0.000 to 40.000VDC Programmable Current Output 0.000 to 5.000ADC Resolution 1mV; 1mA Fixed Outputs 5V (2A) and 3.
