Extech 380820 Universal AC Power Source and AC Power Analyzer
A power analyzer with Front (100W) and Rear (2000W) Universal Output Sockets For testing products from 85 to 250VAC, 45 to 65Hz.
Front Panel Description
- Front Output Socket: Use the following formula to determine the continuous use capability of the output: Time (t) = 100 / Watt (w). For example, 100W power can be continuously output for 1 minute and 50W could be continuously output for 2 minutes. Switch off the tester for 20 minutes (for ventilation) between output sessions.
- OPER/STBY: Press to enable/disable the output. When the unit is in STBY mode, the output is 0 volts. When the unit is in OPER mode, the power will not output until the voltage level is stable; this is to prevent damage to connected devices from unstable voltage.
- Backspace: If a typing error is made, use the button to clear the digit to the left.
- LCD: Liquid Crystal Display
- RECALL: Recalls stored voltage and frequency values (there are 99 sets of preset values in the memory). The currently selected voltage and frequency values will clear when the RECALL button is pressed. Type a memory location number (1 to 99) and then press the V.ENTER button to confirm. If no data is stored in a particular location, the LCD will display “BLANK number” (e.g. “BLANK 33”). Use the STORE button to save a voltage/frequency value to a memory location.
- Numeric Keypad: The numeric keypad is a user programming interface.
- : Moves the cursor to the next digit.
- OUTPUT FRONT/REAR: Selects the output. Press downward to display the Rear Output status. Press upward to display the Front Output status.
- : Increases a value.
- : Decrease a value.
- POWER ON/OFF: Press to switch the supply ON or OFF.
- V.ENTER: Press to confirm a program entry.
- $: Calculates the power rate. Type the power rate first, then press $ to confirm. When the unit is in OPER mode, the power rate per day/month/year will be displayed.
- OCP: Preset value of the Over Current Protection. Type the value for over-current protection and then press OCP to confirm.
- Hz: Press to enter the frequency programming mode for the front output. Type the desired frequency and then press Hz to confirm.
- FUNC: Press to view THD (total harmonic distortion), voltage, current, and harmonics (1st to 50th) for the output power.
- STORE: Press to save the currently programmed voltage and frequency to one of the memory locations (1 to 99) and press V.ENTER to confirm. The currently selected voltage and frequency will be stored in the selected memory location.
Rear Panel Description
- Ventilation: Please keep these openings clean and always leave room for ventilation at the rear of the unit.
- POWER INPUT: Socket for external power input (contains a 10A fuse). The input is selectable (110V or 220V) and must match the voltage selected by the Voltage Switch.
- RS232 Connector: For connection to a PC serial port.
- Voltage Switch: Selects the voltage (110 or 220V) of the input power.
- Rear Output Socket
CAUTION! The rear output socket is “LIVE” whenever the instrument power cord is plugged in
Basic Test Setup Diagram
Connect the Unit Under Test to the 380820.
Front and Rear Output Select
When the unit is switched ON, use the OUTPUT button to select the display for the Front or Rear output data. When the push button is in the out position, the LCD displays the data for the Front output. When depressed, the LCD will display the power data for the Rear output.
‘Cost of Electricity’ Function
Calculate the cost of electricity in kilowatt-hours (KWh) over a specific period of time using the ‘Cost of Electricity’ function.
- Program the power cost per KWh and press the $ button.
- When the unit is in OPER Output Mode, changing the OCP value or the Voltage value will switch the mode from OPER to STBY (standby). Therefore pay careful attention to this operation.
- In the OPER Mode, press the OPER/STBY button. The cost for the tested instrument per DAY/ MONTH/ YEAR will be displayed (left to right).
- Press the $ button again to return to the normal power data display mode.
Harmonics Display: (Rear Output)
- The LCD displays the power data of the Rear Output.
- When the FUNC button is pressed, the LCD will display Voltage, THD and harmonics (n=1~50). Use the buttons to select the harmonics to be displayed.
- When the FUNC button is pressed again, the LCD will display the value of Current. Press the FUNC button again, the LCD will return to the power source display for the Rear Output.
If the power supply does not switch ON or if the previous load was larger than 10A, it is possible that the 10A fuse was blown. Please remove the input power source and check the fuse located under the input power source connector on the rear of the unit. If the fuse is damaged please replace it using a high quality fuse which meets the specified requirements (250V, 10A).
Front Output Overheating Protection
The maximum output for the front output is 100VA (V x A) for 2 minutes. The output duration is longer when the VA is smaller. When VA is less than 25VA, the output is continuous.
If the output value exceeds the specified limits, the output will be placed in STANDBY mode and the LCD will display “OVERHEATED”. A displayed timer indicates the remaining cooling time that must elapse before the unit can be switched ON again; When the displayed timer counts down to zero press the OPER button.
Warning: Switch the unit OFF within 10 minutes of an overheating condition. The unit should then be left idle for 5 minutes after power is switched ON.
PC Interface for Data Acquisition
The 380820 can be connected to a PC where readings can be logged in real-time as they are taken. Transferred reading data can be viewed, plotted, statistically analyzed, printed, and saved in the software program included with the unit. The data can also be exported and saved in a .csv format which can be easily opened in spreadsheet programs. Please refer to the Software User Manual for the 380820 for further instructions.