CONTENTS 1 General Information 3 1.1 Safety Instructions 3 1.2 Switching the Operating Voltage 230 V~/115 V~ 3 1.3 Mains Connection 4 1.4 Installing the Power Supply Unit 4 1.5 Switching on 4 1.6 EMC 4 1.7 Inspection and Maintenance 4 1.8 Warranty 5 1.9 Accessories Supplied 5 2 Application 6 3 Set-up and Functional Description 6 3.1 Block Diagram 6 3.2 Description 7 4 Technical Data 8 4.1 General Data 8 4.2 Specifications 4.2.1 Characteristics of Sources A and B 4.2.
6.4.2 Voltage Setting 6.4.3 Current Setting 18 18 6.5 Parameter Control 19 6.6 Parameter Pre-set 6.6.1 Storing the Pre-settings 6.6.2 Loading the Pre-settings 19 20 20 6.7 Error Messages 21 7 Remote Control by Program 22 7.1 Preparing the Power Supply Unit 7.1.1 Interface GPIB (IEEE-488.2) 7.1.2 Interface RS-232C 22 22 22 7.2 Transition: Remote Control ⇔ Local Control 23 7.3 Messages of the Power Supply Unit on Remote Control 7.3.1 Description of the Unit State 7.3.1.
1 General Information 1.1 Safety Instructions Wherever you see this sign you will find information on potential hazards. Please read these sections with particular care! 1.2 Warning! Before opening the PN 300 disconnect the mains plug! Attention! If the fuse has to be changed, use only G fuse-link 5 × 20 according to IEC 127 (see 4.1)! Switching the Operating Voltage 230 V~/115 V~ Your PN 300 left the factory to 230 V~.
1.3 Mains Connection The design of the unit meets the requirements of safety class I according to EN 61010-1, i.e. all metal parts accessible from outside and exposed to contact are connected with the protective conducto of the supply network. Power is supplied via a mains cable with earthing contact. 1.4 Installing the Power Supply Unit The PN 300 should not be operated close to equipment that develops heat.
1.8 Warranty GRUNDIG guarantees the perfect working order of the PN 300 for 12 months as from delivery. There is no warranty for faults arising from improper operation or from changes made to the PN 300 or from inappropriate application. If a fault occurs please contact or send your PN 300 to: The PN 300 should be sent in appropriate packing - if possible in the original packing.
2 Application The programmable low-voltage power supply unit PN 300 is an efficient triple power source. Sources A and B can supply voltages from 0 to 30 V in steps of 10 mV and currents from 0 to 2.3 A in steps of 1 mA. The settings accuracy of the output voltage of both sources is 0.05 %. The interference voltage at the output terminals is less than Vrms = 1 mV. The sources can be used independently (A and B) or in parallel connection (A + B).
3.2 Description The power supply unit PN 300 basically consists of two similar sources A and B that are free of earthing, a central processor unit with interfaces for communication and a constant voltage source of 5 V/2 A (source C). The source A circuit is fed by the secondary winding (1) of the transformer. Here, the relay (2) is switched over in response to the load resistance. Rectification and filtration (3) of the voltage are the next steps.
4 Technical Data 4.1 General Data Nominal temperature: Operating temperature: Relative humidity: Atmospheric pressure: Operating position: Operating voltage: Frequency: Power consumption: Fuses: Safety class: Radio interference suppression: Dimensions (L × H × D): Dimensions of packing: Weight of power supply unit: incl.
4.2.2 Parallel Connection of Sources A and B Output current: Accuracy of current setting: Interference voltage on output: Accuracy of internal current measurement Recovery time for load changs between 10 % and 100 %: Indication on display: 0.3 to 4.6 A ± (1 % + 20 mA) Vrms ≤ 2 mV for 15 Hz ≤ f ≤ 15 MHz ± (1 % + 20 mA) ≤ 600 µs for ∆V ≤ 30 mV Imax = 4.600 A In all other respects the specifications listed in 4.2.1 apply. 4.2.
PN 300 PC FG 1 1 FG TXD 2 2 TXD RXD 3 3 RXD RTS 4 4 RTS CTS 5 5 CTS DSR 6 6 DSR SG 7 7 SG DCD 8 8 DCD DTR 20 20 DTR Figure 1: Plug Connections Operating Instructions PN 300 1/99 10
5 Control Elements 5 10 8 6 2 7 3 4 1 11 12 13 9 14 15 [1] Power switch [2] Output sockets of source A see 4.2.1 [3] Output sockets of source B see 4.2.1 [4] Output sockets of source C see 4.2.3 [5] LC display see 4.4 [6] LED A CV The LED lights up green if source A works as a constant voltage source. If the source is used as a constant current source the LED lights up red, signalling that the voltage value is out of reach.
The LED lights up green if source B works as a constant voltage source. If the source is used as a constant current source the LED lights up red, signalling that the voltage value is out of reach.
[8] LED A CC The LED lights up green if source A works as a constant current source. If the source is used as a constant voltage source the LED lights up red, signalling that the voltage value is out of reach. [9] LED B CC The LED lights up green if source B works as a constant current source. If the source is used as a constant voltage source the LED lights up red, signalling that the voltage value is out of reach.
The power is supplied by a fused plug for non-heating appliances. The PN 300 is protected by a fuse of T 4 AL/250 V for 230 V~ or T 8 AL/250 V for 115 V~ mains voltage respectively. The operating voltage indication shows which operating voltage is to be used. The interfaces GPIB und RS-232C serve the purpose of data transmission on remote via external devices.
6.2 Selecting the Operating Mode 6.2.1 Independent Mode of Sources A und B Sources A and B work independently and can be adjusted separately in this operating mode.
6.2.3 Parallel Mode of Sources A and B The outputs of sources A and B with the same polarity are connected internally in parallel in this operating mode. Thus, the output is doubled compared to the individual sources.
6.3.2 Constant Current Source Sources A and B work as constant current source in this functional mode. The output current is kept constant during the operation period irrespective of load or temperature deviations. After pressing the MODE button [11] the sub-menu for setting the operating mode is accessed.
The selection of the input mode DIRECT and the activation of the outputs with the OUT A/B button [15] causes the previously set voltage and current values to appear on the display [5]. Now the cursor blinks at the previously input position. Using the V button, [11], I button [11], A/B button [12] and the cursor buttons [13] the parameters can be consecutively set on the display [5] and at the outputs of sources A [2] and B [3].
6.5 Parameter Control The voltage and current values of the sources are internally controlled by the instrument. It is possible to choose between two protective functions when the upper or lower limits are exceeded. After pressing the MODE button [11] the sub-menu for setting the operating mode is accessed.
6.6.1 Storing the Pre-settings The input of the parameters and functions is set as described in sections 6.2 to 6.5. After pressing the MEM button [11] the sub-menu for storing and loading the unit settings is set.
and the settings can be corrected. If the former state is to be kept, the ESC button [12] has to be pressed. The new settings are loaded with the ENTER button [12]. In both cases the unit reverts to the starting state. 6.7 Error Messages During the operation of the sources errors can occur owing to wrong connecting conditions or internal problems.
7 Remote Control by Program Remote control of the power supply unit by a PC is possible via the interfaces GPIB and RS232C. The serial connecting cable must not be longer than 15 m. Interface cables should be connected when the unit is off. After switching on the power supply unit is in starting position and can receive commands. The remote control is displayed on LED REMOTE [14]. 7.1 Preparing the Power Supply Unit 7.1.1 Interface GPIB (IEEE-488.
With the help of the ENTER button [12] the menu point is confirmed and the following message is displayed: INTERFACE SEL : [RS 232C] On pressing cursor buttons “∧” and “∨” [13] the desired interface GPIB or RS 232C is set. The new setting RS 232C is saved with the ENTER button [12] and the following message appears on the display [5]: RS 232C RATE: [24ØØ Bd] On pressing cursor buttons “∧” and “∨” [13] the selected transmission rate from 12ØØ Bd to 96ØØ Bd is set.
7.3 Messages of the Power Supply Unit on Remote Control 7.3.1 Description of the Unit State The current status of the unit’s operating conditions can be indicated via the EVENT STATUS REGISTER and the STATUS BYTE REGISTER at any time. 7.3.1.1 ESR - EVENT STATUS REGISTER The contents of the ESR register are saved in the output buffer and deleted by transmission of the command *ESR? from the PC.
Contents of the STB register: STB xxx Bit 7: is not used, is always set on Ø. 6: (MSS) Master Summary Bit, result by checking of the STB register with a mask (SRE register, see below). (RQS) Request service, for GPIB interface only, is derived from the condition of the MSS bit according to IEEE-488.2 and is read as part of the STB register by transmission of the command *STB? in serial operating mode according to IEEE-488.1.
7.3.3 Description of Errors When errors occur in the remote-controlled settings and measurements, they are saved with a code in the error register. The contents (error message) of the error register can be called and deleted at any time by transmission of the command ERR?. If several errors arise only the first two error codes are saved. On repeating transmission of the command ERR? the contents of the error codes are saved in the output buffer and initialized (deleted).
List of error messages: Error Code Ø 21 22 91 96 111 114 117 12Ø 132 134 151 181 Text of Messages Meaning of Text DEVICE ERROR DEVICE DEPENDENT ERROR EXCEEDED I LIMIT EXCEEDED V LIMIT UNIT OVERHEATED LOAD FAILED INTERFACE ERROR QUERY ERROR UNDERMINATED INTERRUPTED DEADLOCKED BAD USING QUERY EXECUTION ERROR NOT EX. IN LOCAL VAL. OUT OF RANGE COMMAND ERROR ILLEGAL COMMAND RS 232 ERROR INP.
DCL (Device clear) Note: This command must not stand between the first command and the end character of a command line. *RST (Reset) Note: - initializing for the communication protocol of the interface GPIB: - address instruction according to IEEE-488.1 RS-232C: - ASCII: DC4 = 20 (dec.) - initializing of unit settings of sources A and B outputs: - disabled operating mode: - INDEPEND (Independent Mode) function mode: - CV (constant voltage source) output voltages: - Ø.ØØ V output currents: - 2.
7.4.2 Commands and Messages Setting the operating mode of sources A and B (see 6.2) - setting of the operating mode INDEPEND (Independent Mode) - setting of the operating mode A-B TRAC (Tracking Mode) - setting of the operating mode A-B PAR (Parallel Mode) - Current operating mode OPER_IND, OPER_TRAC or OPER_PAR is saved in the output buffer.
- current setting to a) 2.3ØØ A for the operating mode INDEPEND and A-B TRAC b) 4.6ØØ A for the operating mode A-B PAR - Current setting A xxxxx is saved in the output buffer. - Measured current value A xxxxx is saved in the output buffer. ISET_MAX ISET? IOUT? Note: When the selected source works off a constant voltage source and the command ISET? is transmitted, the displayed current represents the value of current limit.
Separation and end characters for transmission of commands: ASCII GBIP RS-232C Separation characters SP = 32 (dec.) NUL to HT = 0 to 9 (dec.) VT to US = 11 to 31 (dec.) SP = 32 (dec.) End characters LF = 10 (dec.) LF = 10 (dec.) + END (EOI true) last character of the command + END (EOI true) LF = 10 (dec.) Separation and end characters for receiving messages: ASCII GBIP RS-232C Separation characters SP = 32 (dec.) SP = 32 (dec.) End characters LF = 10 (dec.
7.6 Program Examples (Q-Basic) 1ØØ 11Ø 12Ø 13Ø 14Ø 15Ø 16Ø 17Ø 18Ø 19Ø 2ØØ 21Ø 22Ø 23Ø 24Ø 25Ø 26Ø 27Ø 28Ø 29Ø 3ØØ 31Ø 32Ø 33Ø 34Ø 35Ø 36Ø 37Ø 38Ø 39Ø 4ØØ 41Ø 42Ø 43Ø 44Ø 45Ø 46Ø 47Ø 48Ø 49Ø 5ØØ 51Ø 52Ø 53Ø 54Ø 55Ø 56Ø 57Ø 58Ø 59Ø REM ***************************************************** REM THE EXAMPLE OF USING PN 3ØØ WITH GPIB-INTERFACE REM AT-GPIB/TNT AND SOFTWARE NI-488.2 OF NI REM VOLTAGE SETTING OF SOURCE A TO 1Ø.ØØ V REM VOLTAGE SETTING OF SOURCE B TO 3Ø.
5 1Ø 2Ø 3Ø 4Ø 5Ø 6Ø 7Ø 8Ø 9Ø 1ØØ 11Ø 12Ø 13Ø 14Ø 15Ø 16Ø 17Ø 18Ø 19Ø 2ØØ 21Ø 22Ø 23Ø 24Ø 25Ø 26Ø 27Ø 28Ø 29Ø 3ØØ 31Ø 32Ø 33Ø 34Ø 35Ø REM ****************************************************** REM THE EXAMPLE OF USING PN 3ØØ WITH RS-232C INTERFACE REM VOLTAGE SETTING OF SOURCE A TO 1Ø.ØØ V REM VOLTAGE SETTING OF SOURCE B TO 3Ø.ØØ V REM CURRENT SETTING OF BOTH SOURCES TO Ø.
9 Appendix 9.
