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Category: Knowledge Base DP700 Series
Black or Green Terminal on a Power Supply
Our power supplies are isolated power supplies. So when you connect to the black negative terminal you have connected your DUT to an isolated channel. Where as if you connect to the green terminal you are connecting your DUT to ground which will no longer have the power supply act as an isolated supply.
DP700 Reaction Time for OVP, OCP and OPP being Exceeded
The image below shows how quickly the DP700 will turn off its output when it detects that OVP, OCP or OPP has been exceeded. The instrument below shut off its output power 26ms after it started creating the higher voltage.
How to Load a DP700 License Option
DP700 series power supply provides the following options:
Trigger: provides the trigger input and output functions.
Timer: outputs based on the preset voltage and current values.
High Resolution: improves the resolution of the instrument.
To install an option, you need an option license (each instrument has a unique license). The option license is a 28-character string, which consists of English letters and numbers. After you purchase an option, you will obtain a key (used for obtaining the option license). You can then install the option using the following steps.
(1) At the bottom of https://www.rigolna.com/ look for the license activation link:
https://licenseen.rigol.com/CustomerService/ProductRight_EN
(2) In the interface, enter the correct key, serial number and verification code. Then click Generate to obtain the option license.
Note: The hyphens in the option license should be omitted.
(3) Press the System key and press Option at the far upper right of the display. Then press the Up/Down arrow key to select the option to be installed.
(4) Press the OK key to enter the license input screen:
(5) In the License Input interface, press the Up/Down/Left/Right arrow key or use the knob to select the desired character (the English letter is not case-sensitive) on the virtual keypad, and then press OK to enter the character. The entered characters will be displayed in the “License Input Area”. While entering the characters.
Note: The hyphens in the option license should be omitted.
(6) After inputting a license, select “Save” on the virtual keypad and press OK. If the option has been successfully installed, a prompt message will be displayed.DP700 Trigger output operation
The DP700 series power supply can receive a trigger to enable the output of the supply. Pin 8 of the RS232 interface on the rear panel is used for trigger input,
When a low level (<1.4V) is received the channel output will be turned on and when the level is equal or greater than 1.4V output will be turned off.To turn of the external trigger capability press System to enter the system utility interface. By default, the “Setting” tab is selected. Press the Up/Down arrow key to switch the parameter focus to “Trig In”, and press the Left/Right arrow key or the knob to enable the trigger input function.
DP700 transient voltage on power up
The DP700 series power supply will show a transient voltage on the outputs when the power supply is powered up. Typically the transient voltage will show approximately 400mV p-p over a 200us duration.
The DP700 power supplies do not have output relays to to enable output after the power supply has been turned on and has stabilized. It is recommended that connections be made to a device after the power supply has been powered up if you are working with circuitry that is sensitive to this transient voltage.Timer operation with the DP700 series power supply
The DP700 series power supply provides a timer function. When the timing output is enabled, the instrument will configure the output voltages and currents based on the preset timer parameters. The edited timer parameters are allowed to be saved to the internal non-volatile memory (NVM), and can be recalled if necessary.Timer is an optional function. If you want to use the timer function the option will need to be purchased and installed.
Pressing the Timer keypad button will bring up the screen below.
Output Groups represents the steps or groups that will be used. In the example above only one group is specified to run as shown in column 1. So Group 1 will output a voltage of 1 volt at 1 amp for 1 second. All other columns are grayed out. You can specify a maximum of 2048 groups.
One Cycle is one sequence of Groups. So you can repeat a sequence of Groups by setting the Cycle setting between 1 and 99999. You can also save and restore timer setups from this menu page as well as set the End State. The End State can be set to last or off.
Trigger Mode can be specified as Single or Auto. When Single is specified the power supply will output one group at a time and will increment to the next group when the OK button is pressed. When Auto is selected the complete sequence of groups will be run.
End State can be selected to Output Off or Last. With Output Off selected the power supply will turn the output off when the last group is completed. When Last is selected the power supply will maintain the settings of the last group that is completed.
To start the sequence of groups press the On/Off button.DP700 series Power Supply Maximum Trigger Input Voltage
Pin 8 of the RS232 interface on the rear panel is used to receive the external trigger input signal. When it receives a high level signal (≥ 2.1 V, 10 mA), the channel output will be turned on. If 8 volts or greater is applied damage to the power supply I/O circuit can result.
Serial Cable for the DP700 series Power Supply
The DP700 series power supplies have a single serial I/O port. If you plan on programming the DP700 power supply from a PC you will need a USB to serial cable.
An example is pictured here:
This particular cable is from Trendnet and has TU-S9 printed on it and has a male serial connector. It’s approximately 26” in length. A search for “Trendnet TU-S9” will bring up multiple sources to order from. The DP700 power supplies have a female serial connector so a gender changer will be necessary accessory as well.