Aim-TTI PLH Series Instruction Manual
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Aim-TTI PLH Series Instruction Manual

Higher voltage linear dc power supplies
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PLH & PLH-P Series
Higher Voltage Linear DC Power Supplies

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  • Page 1 PLH & PLH-P Series Higher Voltage Linear DC Power Supplies...

  • Page 2: Table Of Contents

    Table of Contents Introduction Specification Safety Installation Connections Manual Operation Remote Analogue Control (programmable models only) Remote Interface Operation Remote Commands Maintenance Note: The latest revisions of this manual, device drivers and software tools can be downloaded from: http://www.aimtti.com/support. This manual is 48511-1470 Issue 11...

  • Page 3: Introduction

    Introduction The PLH Series are higher voltage laboratory dc power supplies that share the platform of the New PL Series but offer output voltages of 120V or 250V. Key aspects include: • Linear regulation for low output noise and fast transient recovery True analogue controls for quick and intuitive adjustment of voltage and current •...

  • Page 4: Specification

    Specification General specifications apply for the temperature range 5°C to 40°C. Accuracy specifications apply for the temperature range 18°C to 28°C after 1 hour warm-up with no load and calibration at 23°C. Typical specifications are determined by design and are not guaranteed. OUTPUTS Voltage/Current Ranges: PLH120...
  • Page 5 Load Regulation: For any load change, measured at the output terminals, using remote sense: Voltage <(0·01% + 10mV). Add typically 2·5mV for a 0·5V drop in the positive output lead. Specification applies for sense lead resistance <0·5Ω. Current typically <(0·01% + 50µA) Line Regulation: Voltage <(0·01% + 10mV) for 10% line change.
  • Page 6 DIGITAL INTERFACES (PLH-P models only) Full digital remote control facilities are available through the RS232, USB, LAN and GPIB (optional) interfaces. Voltage Setting: Resolution 10mV, Accuracy ± (0·05% + 50mV) Voltage Readback: Resolution 10mV, Accuracy ± (0·1% + 50mV) Current Setting and Resolution 0·1mA;...

  • Page 7: Safety

    Safety This instrument is a Safety Class I instrument according to IEC classification and has been designed to meet the requirements of EN61010-1 (Safety Requirements for Electrical Equipment for Measurement, Control and Laboratory Use). It is an Installation Category II instrument intended for operation from a normal single phase supply.

  • Page 8: Installation

    Installation Mains Operating Voltage Check that the instrument operating voltage marked on the rear panel is suitable for the local supply. Should it be necessary to change the operating voltage, proceed as follows: Ensure that the instrument is disconnected from the AC supply. Remove the plastic push-rivets at each side edge of the top cover.

  • Page 9: Connections

    Connections Front Panel Connections The load should be connected to the positive (red) and negative (black) terminals marked OUTPUT. Both are fully floating and either can be connected to ground. Remote sense connections to the load, if required, are made from the positive (+) and negative (−) SENSE terminals.
  • Page 10 Rear Panel Connections (programmable models only) Non-programmable models have no rear panel connections. The rear panel connections of the programmable units are shown below: Output Terminals The Output terminals are duplicated on the rear panel terminal block; space restrictions limit the markings to + and −...
  • Page 11 Remote On/Off A switch closure or logic low between connections Rem Off and COMmon will turn off the output. Warning! COM is referenced to the output control circuit and will be within ~1V of the positive output potential. Do not apply external voltages to these terminals. RS232 9−pin female D−connector with pin connections as shown below.

  • Page 12: Manual Operation

    Manual Operation In this operating manual, front panel keys, controls and sockets are shown in capitals, e.g. CURRENT, OUTPUT, LOCK. Messages displayed on the 7-segment LEDs are shown in a different type-font, e.g. turn oFF, OtP trip. Switching On and Power-On Conditions The POWER switch is located at the bottom left of the front panel.
  • Page 13 Constant Voltage The output voltage is adjusted using the main and fine VOLTAGE controls; the CURRENT control sets the maximum current that can be supplied. Constant Current If the load resistance is low enough such that, at the output voltage set, a current greater than the current limit setting would flow, the power supply will automatically move into constant current operation.
  • Page 14 Warning! Voltages above 60Vdc are hazardous live according to EN 61010-1 and great care must be taken when using the power supply at voltages above this level. Ensure that the exposed end of the wire is fully inserted and inaccessible to the touch. Always make connections to the instrument with the OUTPUT off.
  • Page 15 With the OUTPUT off the load is still connected to the power supply output stage; the output voltage is simply set to zero. Do not apply external voltages to the power supply terminals in excess of the rated output voltage, even with the output off, or damage may result. Over-temperature Protection An internal sensor will detect over-temperature due to blocked airflow, fan failure or other circuit fault.
  • Page 16 Using Voltage Span The VOLTAGE SPAN (V-Span) capability allows the end-stop values of the VOLTAGE controls to be redefined by the user such that the controls operate within a specific, narrower, voltage range. This not only has the advantage of protecting against the accidental application to the load of voltages outside of the range, but also provides high-resolution analogue control over the specified voltage range using the full 300º...

  • Page 17: Remote Analogue Control (Programmable Models Only)

    Remote Analogue Control (programmable models only) Remote analogue control of output voltage and current is possible using variable external control voltages applied between the rear panel CV or CC and Return (RTN) inputs respectively. These inputs are isolated from the output; the isolation rating with respect to the output is 300V max. Inputs are protected against excess input voltages of up to 60V.
  • Page 18 OVP and OCP OVP (over-voltage protection) and OCP (over-current protection) are implemented in firmware and can only be set and used when under remote control via the RS232, USB, LAN (LXI) or GPIB interfaces. Setting resolutions are 10mV and 1mA and typical response times are 500ms. However, in local mode, OVP and OCP are still active but automatically default to 105% of the instrument's range maximum.
  • Page 19 Analogue Out Control Voltages Analogue Out control voltages V and I are generated from the actual internal control voltages, for which the active source can be the front panel controls, the digital interface (RS232, USB, LAN or GPIB) or the remote analogue inputs CV and CC. V and I are scaled such that 0 to 100% of the rated output voltage and current (high range only) generate 0V to 5V at the rear panel V...
  • Page 20 If independent current limits are required set CC to Local and set the limits from the front panel of each unit. Warning! In series operation take care not to exceed the maximum rated operating voltage (300V) of any terminal with respect to earth ground ( ) . Remote Off A switch closure or logic low between the rear panel Rem Off and COM inputs will remotely turn off the output if it was previously on;...

  • Page 21: Remote Interface Operation

    Remote Interface Operation The instrument can be remotely controlled via its RS232, USB, LAN or GPIB (optional) interfaces. Analogue remote control is described in the previous section. USB remote control operates in a similar way to RS232 but via the USB connector. Software supplied with the instrument sets up the controlling computer to treat the USB connection as a virtual COM port.
  • Page 22 Remote/Local Operation At power-on the instrument will be in the local state with the REMOTE indicator off. In this state all front panel operations are possible. When the instrument is addressed to listen and a command is received the remote state will be entered and REMOTE will be turned on. In this state the front panel is locked out and remote commands only will be processed.
  • Page 23 Baud Rate for this instrument is fixed at 9600; the other parameters are fixed as follows: Start Bits: 1 Parity: None Data Bits: 8 Stop Bits: 1 RS232 Character Set Because of the need for XON/XOFF handshake it is possible to send ASCII coded data only; binary blocks are not allowed.
  • Page 24 cannot be found a static IP address of 192.168.0.100 is assigned. Resetting the LAN removes any password protection. For more information on LXI standards refer to www.lxistandard.org/home . LAN Connection To use the LAN interface, the IP address of the unit must be known. On the supplied CD-ROM is a guide to the LXI Discovery Tool which provides links to the latest version of the tool and associated downloads.
  • Page 25 mDNS and DNS-SD Support Multicast DNS provides DNS services even on networks without a central DNS server (or DHCP server). This simplifies the setting up of a simple LAN using meaningful hostnames instead of a raw IP address. With service discovery it becomes straightforward for the device to be discovered and the services it provides.
  • Page 26 Service Request Remote Local Parallel Poll Device Clear Device Trigger Controller Electrical Interface GPIB IEEE Std. 488.2 Error Handling – Query Error Register The IEEE 488.2 error (addressed to talk with nothing to say) is handled as follows. If UNTERMINATED the instrument is addressed to talk and the response formatter is inactive and the input queue is empty then the error is generated.
  • Page 27 During parallel poll response the DIO interface lines are resistively terminated (passive termination). This allows multiple devices to share the same response bit position in either wired-AND or wired- OR configuration, see IEEE 488.1 for more information. Status Reporting A separate error and status model is maintained for each interface instance; an interface instance is defined as a potential connection.
  • Page 28 101: A recall of set up data has been requested but the store specified contains corrupted data. This indicates either a hardware fault or a temporary data corruption, which can be corrected by writing data to the store again. 102: A recall of set up data has been requested but the store specified does not contain any data.
  • Page 29 Bit 1 - LIM2. This will be set if any bits in Limit Event Status Register 2 are set and corresponding bits are set in Limit Event Status Enable Register 2. Bit 0 - LIM1. This will be set if any bits in Limit Event Status Register 1 are set and corresponding bits are set in Limit Event Status Enable Register 1.
  • Page 30 Power-on and Remote Operation Default Settings The following instrument status values are set at power on: Status Byte Register Service Request Enable Register † Standard Event Status Register = 128 (pon bit set) Standard Event Status Enable Register † Execution Error Register Query Error Register Parallel Poll Enable Register †...

  • Page 31: Remote Commands

    Remote Commands RS232/USB Remote Command Format RS232 input to the instrument is buffered in a 256 byte input queue which is filled, under interrupt, in a manner transparent to all other instrument operations. The instrument will send XOFF when approximately 200 characters are in the queue. XON will be sent when approximately 100 free spaces become available in the queue after XOFF was sent.
  • Page 32 is the new line character with the END message NL^END. <RESPONSE MESSAGE TERMINATOR> Each query produces a specific which is listed along with the command in the <RESPONSE MESSAGE> remote commands list. is ignored except in command identifiers. e.g. '*C LS' is not equivalent to '*CLS'. <WHITE SPACE>...
  • Page 33 V< > < > Set output < > to < > Volts V< >V < > Set output < > to < > Volts with verify OVP< > < > Set output < > over voltage protection trip point to < >...
  • Page 34 is < 1>< > SAV< > < > Save the current set-up of output < > to the set-up store specified by < > where < > can be 0-9. RCL< > < > Recall a set up for output < >...
  • Page 35 Interface Management Commands LOCAL Go to local. This does not release any active interface lock so that the lock remains with the selected interface when the next remote command is received. IFLOCK Request Instrument ‘lock’. This command requests exclusive access control of the instrument.

  • Page 36: Maintenance

    Miscellaneous Commands *IDN? Returns the instrument identification. The exact response is determined by the instrument configuration and is of the form <NAME>,<model>,<Serial No.>, <version>< > where <NAME> is the manufacturer's name, <model> defines the type of instrument, Serial No. is the unique serial number and <version>...
  • Page 37 48511-1470 11...

This manual is also suitable for:

Plh-p seriesPlh250

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