Thurlby Thandar Instruments QL II User Manual

QL Series II

Precision Power Supplies

INSTRUCTION MANUAL

Table of Contents

Introduction 2 Specification 4 EMC 8 Safety 9 Installation 10 Connections 11

Front Panel Connections 11

Rear Panel Connections 11 Initial Operation 13 Manual Operation 16

Main Outputs 16

Main Outputs – Link Mode (T models only) 23

Main Outputs – Copy Function (T models only) 25

Auxiliary Output (T models only) 25 Remote Operation (P models only) 26

Interface Locking 26

Address & Baud Rate Selection and Interface Status View 26

Remote/Local Operation 27

RS232 Interface 27

USB Interface 28

LAN Interface 28

Status Reporting 32 Remote Commands 35

RS232/USB Remote Command Format 35

GPIB Remote Command Formats 35

Command List 36 Maintenance 40

Note: The latest revisions of this manual, device drivers and software tools can be downloaded from: http://www.tti-test.com/go/qlx

This manual is 48511-1560 Issue 3

Unmatched Precision, Unrivalled Performance

The QL series II provides the highest perform ance levels available in a laboratory power supply. Voltage and current are controlled using 16 bit DACs enabling voltages to be s et t o 1mV resolution

even at full output. Indeed, the accurac y is suff icient for the PSU to be used as a calibration source for some hand-held DMMs.

The QL series II uses pure linear technology and offers unrivalled perfor m anc e in terms of regulation, output noise and dynamics. Line and load regulation are c lose t o t he limit of measurement. Output noise is less t han 350µV r m s in CV mode and down to 20µA rms in CI mode. Recovery time from transient cur rent pulses is better than 50µs.

It provides full remote sense capability via dedicated sense terminals. Remote sense is ess ent ial to maintain precise regulation at the load. When remote sense is not req uired, internal local sensing can be selected at the touch of a but ton.

Multiple Ranges for Greater Flexibility

The QL series II provides multiple ranges for increased cur r ent capability at lower voltages. The main range offers 0 to 35 Volts at up to 3 Amps (QL355) or 0 to 56 Volts at up to 2 Amps (QL564). The higher current rang e pr ovides up to 5 Amps for voltages up to 15V (QL355) or 4 Amps for voltages up to 25V (QL564). A f ur ther low current range provides enhanced current setting and measurement resolution of 0·1mA.

The product of voltage and current c an be displayed at any time by pressing the VxA but t on. The power is displayed to a resolution of 0·01 Watts.

Introduction

Fast, Simple and Safe to use

The user interface of the QL series II has been carefully designed to provide rapid control whilst guarding against any possibility of error.

Voltage and current setting can be per formed either by direct numeric entry or, for applications where the voltage or current must be gradually changed, by using t he quasi-analogue Jog control.

To enable the current limit t o be set before connecting the load, the limit s et ting is displayed when the output is off. Pressing t he View Limits key at any time provides a temporary display of the limit values allowing precise adjustment to also be made with the output on.

Setting Memories for Added Convenience

The QL series II provides storage of up to 50 power supply sets-ups in non-volatile memory for each main output, plus (T models only) a further 50 set-ups for linked mode operation, plus 10 setups for the auxiliary output. Upon mains switch-off, the set -up of the PSU is saved and is automatically restored at switch-on.

OVP and OCP Trips with 'Alarm' Output

The QL series II provides fully adjustable over-voltage and over-current trips which can be used both as a fail-safe against acc idental mis-s et t ing and as a protection against inappropriate load conditions. In addition to turning the out put off, a trip condition switches the rear panel alarm signal enabling other equipment to be cont r olled.

For complete protection of t he power supply, the trip will also be operated by over-temperature or excess voltage on the sense terminals.

Auxiliary Output with Fully Variable Voltage (T models)

The QL series II triple output power supplies incorporate an auxiliary output which is fully variable between 1 volt and 6 volts to a resolution of 0.01V, and has a current capability of 3 amps.

A front panel button enables to voltage and current for the auxiliary output to be viewed on the Output 1 display whenever required.

Fully Programmable via GPIB, RS232, USB or L AN

The programmable ‘P’ models incorporate a full bus interface permitting remote control and readback via either GPIB (IEEE-488), RS232, USB or LAN.

The GPIB interface conforms fully with IEEE-488.2 and IEEE-488.1. The RS232 interface uses a standard 9-pin D-connect or and has a Baud r at e variable from 600

to 19200. The USB interface is compatible with USB 2.0 and USB 1.x. The LAN interface is LXI version 1.2, Class C, com pliant . The QL series II uses simple and consistent command struc t ur es which make programming

particularly easy regardless of which interface is used. An IVI driver for Windows is included. This provides support for common high-level applications

such as LabView*, LabWindows*, and HP/Agilent VEE*. All power supply settings can be controlled via the bus. Voltage and current can be set to a

resolution of 1mV or 0·1mA (main outputs). Actual voltage and current can be read back together with the power supply status.

* LabView LabWindows is a trademark of National Instrument s Corp. Agilent VEE is a trademark of Agilent Technologies i nc.

Voltage/Current Ranges:

QL355

QL564

0V to 15V/0·001A to 5A

0V to 25V/0·001A to 4A

Accuracy ± (0·03% + 5mV)

Accuracy ± (0·2% + 5mA); ± (0·2% + 0·5mA) on 500mA range.

CI indicator lit in constant current mode.

Preset voltage and current limit displayed when Output off.

Duplicate rear panel Output and Sense screw terminals on P models.

load to half load or vice versa.

Speed:

excursion (for resistive load). Excludes command processing t im e.

QL355

QL564

Load

35V 500mA

200ms

40ms

56V/500mA

300ms

60ms

Down

35V 500mA

120ms

600ms

56V/500mA

200ms

800ms

(20MHz bandwidth):

Normal mode current: <0·2mAr m s; <20µArms on 500mA range.

Specification applies for sense lead resistance <0·5Ω.

Current <0·01% + 250µA; <0.01%+ 50µ A on 500mA range.

typically<(100ppm + 0·1mA)/°C on 500mA range.

General specifications apply for the tem per ature 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.

MAIN OUTPUTS

Specification

0V to 35V/0·001A to 3A

0V to 35V/0·1mA to 500mA

Voltage Setting: Resolution 1mV

Current Setting: Resolution 1mA; 0·1mA on 500mA range

Output Mode: Constant voltage or constant current with automatic cross-over.

Output Switch: Electronic, non isolating. Switch illuminated when Output on.

Output T erminals: Universal 4mm safety binding posts on 19mm (0·75”) pitc h for Output;

screwless terminals for Sense.

Transient Response:

Voltage Programming

<50µs to within 15mV of set level for a change in load current from full

Maximum time required for output to settle within 1% of its total

Full Load

0V to 56V/0·001A to 2A 0V to 56V/0·1mA to 500mA

Full Load No

Down

Ripple and Noise

Load Regulation: For any load change, measured at the output t er m inals, using

Line Regulation: Voltage <0·01% + 2mV for 10% line change.

Temperature Coeff icient : Voltage: typically <(50ppm + 0·5mV)/°C

15V 5A 35V 3A

Normal mode voltage: <0·35mVrms and 2mVp-p

remote sense. Voltage <0·01% + 2mV.

Current <0·01% + 250µA; <0.01% + 50µ A on 500mA range. Add typically 2·5mV for a 0·5V drop in the positive output lead.

Current: typically <(100ppm + 1mA)/°C;

6ms 20ms

6ms 25ms

6ms 7ms

250ms 600ms

25V/4A 56V/2A

10ms 40ms

10ms 50ms

6ms 15ms

400ms 800ms

Response time typically 100µs

Response time typically 35ms

Protection Functions:

Output trips off for OVP, OCP, over-temperature and Sense miswiring

Display Ty pe:

5-digit (Volts), 4-digit (Amps), 14mm (0·56") LED.

Accuracy ± (0·1% of reading + 10m V)

Accuracy ± (0·2% + 0·005A); ± ( 0· 2% + 0· 5m A) on 500m A range

Accuracy ± (0·3% + 0·05W); ± (0·3% + 0·005W) on 500mA range

Voltage Range:

1V to 6V

Accuracy: ± 0.5% ±10mV

Current Limit:

3A minimum

Output Switch:

Electronic, non isolating. Switch illuminated when Output on.

screwless terminals on rear panel.

protection for currents up t o 1A. O ver-c ur r ent trip.

(20MHz bandwidth)

Load & Line Regulation:

<1·0% for a 90% load change; 0·1% for a 10% line change.

(use SET/VIEW button)

Current Meter: Resolution 10mA, accuracy ± 0.5% ±10m A

Speed:

excursion (for resistive load). Excludes command processing t im e.

1V to 6V: 10ms, no load and full load

6V to 1V: 10ms, no load and full load

Output Protection: Output will withstand forward voltages of up to 20V above rated output

voltage. Reverse protection by diode clamp for currents up to 3A.

Over-voltage Protection: (OVP)

Over-current Pr otection: (OCP)

Range 1V to 40V (QL355), 1V to 60V (QL564) Resolution 0·1V; accuracy ± (2% + 0·5V)

Range 0·01A to 5·5A (QL355) , 0·01A to 4·4A (QL564) Resolution 0·01A; accuracy ± (0·2% + 0·01A)

METER SPECIFICATIONS (Main Outputs)

Voltage (CI mode): Resolution 10mV

Current (CV mode): Resolution 0·001A; 0·1mA on 500mA range

V x A: Resolution 0·01W; 0·001W on 500mA range

AUXILIARY OUTPUT (T models only)

Voltage Setting: Resolution: 10mV

Output T erminals: Universal 4mm safety binding posts on 19mm (0·75”) pitc h. Duplicate

Output Protection: Output will withstand up to 16V forward voltage. Diode clamp reverse

Ripple & Noise:

Status Indication: Current limit lamp. Current overload trip indication. Meter Specifications:

Voltage Programming

<2mV rms, 10mVp-p

Voltage Meter: Resolution 10mV, accuracy ± 0.5% ±10mV

Maximum time required for output to settle within 1% of its total

KEYBOARD & ROTARY CONTRO L

All functions, including the selection and set-up of the remote control interf ac es, c an be set from the keyboard. The rotary jog control can be used to adj ust output voltage and current settings in a quasi-analogue mode.

General

RS232:

Standard 9-pin D-connector. Variable Baud rate (600 to 19200).

GPIB:

Conforming with IEEE488.1 and IEEE488.2

USB:

Standard USB 2.0 hardware connection. Operates as a virtual COM port.

MDIX. LXI V1.2, Class C compliant.

change.

Status Indication:

Remote mode and LAN status indicators

Main Outputs

Voltage Setting:

16-bit; Resolution 1mV, accuracy ± (0·03% +5mV)

Resolution 0.01mA, Accuracy ± (0·2% + 0·5mA) on 500mA range.

Readback V & I

See meter specifications.

Auxiliary Output (T models only)

Voltage Setting:

Resolution 10mV, accur acy ± 0. 5% ± 10m V

Current Setting:

Resolution 10mA, accuracy ± 0.5% ±10mA

Readback V & I

See meter specifications

Installation Category II

Power Consumption:

Single output: 250VA max; Triple output: 500VA max.

Operating Range:

+5ºC to +40ºC, 20% to 80% RH

Storage Range:

−40ºC to + 70ºC

Environmental:

Indoor use at altitudes up to 2000m, Pollution Degree 2.

output if internal temperat ur es exceed predet ermined thresholds.

interfaces.

Safety:

Complies with EN61010−1

EMC:

Complies with EN61326

Triple output: 280 x 160 x 290mm (WxHxD), excl. feet & t er m inals

ALARM OUTPUT

Isolated rear-panel open-collector output signal. User can s elect out put to be activated for either OVP, OCP, Overtemperature or Sense m iswiring, or for any of those four f aults.

DIGITAL INTERFACES (P models only)

Full digital remote control facilities are available through the RS232, USB, LAN and G PI B inter faces.

LAN: Ethernet 100/10base-T hardware connection. Auto speed detect, auto

Remote Command Processing Time:

Current Setting: 16-bit; Resolution 0.1mA, accuracy ± (0·2% + 5mA)

GENERAL

AC Input: 230V AC or 115V AC ± 10%, 50/60Hz

Typically < 25m s bet ween receiving the com m and terminator for a step voltage change at the instrument and the out put voltage beg inning to

Cooling: Intelligent variable-speed fan. O ver-temperature trip shuts down

Store/Recall: Up to 50 set-ups each main output, 50 linked set-ups, and 10 auxiliary

output settings can be saved and recalled via the keyboard or remote

Size: Single output: 140 x 160 x 290mm (WxHxD), excl. feet & terminals.

Weight: Single: 5.5kg; Triple: 10·5kg

Performance levels achieved are detailed in the user manual.

EC Declaration of Conf ormity

We Thurlby Thandar Instruments Ltd

Glebe Road Huntingdon Cambridgeshire PE29 7DR England

declare that the

QL355, QL355P, QL564, QL564P, QL355T, QL355TP, QL564T and QL564TP

meet the intent of the EMC Directive 2004/108/EC and the Low Voltage Directive 2006/95/EC. Compliance was demonstrated by conformance to the following specifications which have been listed in the Official Journal of the European Comm unit ies.

Precision Power Suppli es

EMC

Emissions: a) EN61326-1 (2006) Radiated, Class B

b) EN61326-1 (2006) Conducted, Class B c) EN61326-1 (2006) Harmonics, ref er ring to EN61000-3-2 (2006)

Immunity: EN61326-1 (2006) Immunity Table 1, referring to:

a) EN61000-4-2 (2009) Electrostatic Discharge b) EN61000-4-3 (2006) Electromagnetic Field c) EN61000-4-11 (2004) Voltage Interrupt d) EN61000-4-4 (2004) Fast Transient e) EN61000-4-5 (2006) Surge f) EN61000-4-6 (2009) Conducted RF

Safety EN61010-1 Installation Category II, Pollution Degree 2.

CHRIS W ILDING TECHNICAL DIRECTOR

2 January 2013

This instrument has been designed to meet the requirements of the EMC Directive 2004/108/EC. Compliance was demonstrated by meeting the test limits of the following standards:

Emissions

EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use. Test limits used were:

a) Radiated: Class B b) Conducted: Class B c) Harm onics: EN61000-3-2 (2006) Class A; the instrument is Class A by product category.

Immunity

EN61326-1 (2006) EMC product standard for Electrical Equipment for Measurement, Control and Laboratory Use.

Test methods, limits and per formance achieved are shown below (requirement shown in brackets):

a) EN61000-4-2 (2009) Electrostatic Discharge : 4k V air, 4kV contact, Perfor m anc e A (B). b) EN61000-4-3 (2006) Electromagnetic Field:

EMC

3V/m, 80% AM at 1kHz, 80MHz – 1GHz: Performance A ( A) and 1. 4GHz to 2GHz: Performance A (A) ; 1V/ m , 2.0GHz to 2.7GHz: Performance A (A).

c) EN61000-4-11 (2004) Voltage Interrupt: ½ cycle 0%: Performance A (B); 1 cycle 0%:

Performance B(B), 25 cycles 70%, and 250 cycles 0%: Per formance B (C).

d) EN61000-4-4 (2004) Fast Transient, 1kV peak (AC line), 0·5kV peak ( DC Out puts) ,

Performance B (B). e) EN61000-4-5 (2006) Surge, 0·5kV (line t o line), 1kV (line to ground), Perform ance A(B). f) EN61000-4-6 (2009) Conducted RF, 3V, 80% AM at 1kHz (AC line only; DC Output

connections <3m, therefor e not tested), Performance A (A). According to EN61326 the definitions of performance criteria are:

Performance criterion A: ‘During test normal performance within the specification limits.’ Performance criterion B: ‘During t est , temporary degradation, or loss of function or

performance which is self-recovering’. Performance criterion C: ‘During t est, temporary degradation, or loss of function or

performance which requires operator int er vention or s ystem r eset occurs.’ Where Performance B is stated it is because DC Output regulation may deviate beyond

Specification limits under the test conditions. However, the possible deviations are still small and unlikely to be a problem in practice.

Note that if operation in a high RF f ield is unavoidable it is good pract ice t o c onnect the PSU to the target system using screened leads which have been passed (together) through an absorbing ferrite sleeve fitted close to the PSU terminals.

Cautions

To ensure continued compliance with the EMC directive observe the following precautions: a) after opening the case for any reason ensur e that all signal and ground connections are

b) In the event of part replacement becoming nec essary, only use components of an

remade correctly and that case screws are correc t ly refitted and tightened.

identical type, see the Service Guide.

Safety

This power supply is a Safety Class I instrument according to IEC classification and has been designed to meet the requirem ents of EN61010-1 (Safety Requirements for Elect r ical Eq uipment for Measurement, Control and Laborator y Use). It is an Installation Category II instrument intended for operation from a normal single phase supply.

This instrument has been tested in accordanc e with EN61010-1 and has been supplied in a safe condition. This instruction manual contains some information and warnings which have to be followed by the user to ensure safe operation and to r etain the inst r um ent in a safe condition.

This instrument has been designed f or indoor use in a Pollution Degree 2 environment in the temperature range 5°C to 40°C, 20% - 80% RH (non-condensing). It may occasionally be subjected to temperatures between +5°C and –10°C without degradation of its safety. Do not operate while condensation is present.

Use of this instrument in a manner not spec ified by these instructions may impair the safety protection provided. Do not operate the instrum ent outside its rat ed supply voltages or environmental range.

WARNING! THIS INSTRUMENT MUST BE EARTHED

Any interruption of the mains earth conduct or inside or outside t he inst r um ent will make the instrument dangerous. I ntentional interruption is prohibited. The protective action must not be negated by the use of an extension cord without a protective conductor.

When the instrument is connected to its supply, t er minals may be live and opening the covers or removal of parts (except those to which access can be gained by hand) is likely to expose live parts. The apparatus shall be disconnected from all voltage sources before it is opened for any adjustment, replacement, m aint enance or repair.

Capacitors inside the power supply may still be charged even if the power supply has been disconnected from all voltage sources but will be safely discharged about 10 m inut es af ter switching off power.

Any adjustment, maintenance and repair of the opened instrument under voltage shall be avoided as far as possible and, if inevitable, shall be carried out only by a skilled person who is aware of the hazard involved.

If the instrument is clearly def ec t ive, has been subject to mechanical damage, excessive moisture or chemical corrosion the safety protection may be impaired and the apparatus should be withdrawn from use and returned for checking and repair.

Make sure that only fuses with the required rated current and of the specified type are used f or replacement. The use of makeshift fuses and the short-circuiting of fuse holders is prohibited.

Do not wet the instrument when cleaning it. The following symbols are used on the instrument and in this manual:-

Earth (ground) terminal.

mains supply OFF.

mains supply ON. alternating current (ac)

direct current (dc)

BROWN BLUE

BROWN BLUEBROWN

115V230V

for 230V operation:

1.6A (T) 250V HBC

for 115V operation:

3.15A (T) 250V HBC

for 230V operation:

4A (T) 250V HBC

for 115V operation:

8A (T) 250V HBC

for 230V operation:

1.6A (T) 250V HBC

for 115V operation:

3.15A (T) 250V HBC

Installation

Check that the instrument oper ating voltage marked on the rear panel is suitable for the local supply. Should it be necessary to change the operating voltage, proceed as follows:

1) Disconnect t he inst r um ent from all voltage sources.

2) Remove the screws which retain the top cover and lift off t he c over.

3) Change the connec t ions on bot h transformers following the appropriat e diag ram below:

4) Refit the cover and the secure with the same screws.

5) To comply with safety standard requirements the operating voltage marked on the rear panel

must be changed to clearly show the new voltage setting.

6) Change all three fuses to ones of the correct r at ing, see below.

Fuse

The AC inlet fuse is located in the fuse drawer in the lower part of the IEC inlet connector. To change the fuse remove the line cord and open the fuse drawer with a suitable tool.

QL355, QL355P, QL564 & QL564P The correct mains fuse t ype is 20 x 5mm 250V HBC time-lag with the following rating:

QL355T, Q L355TP, Q L564T & QL564TP The correct mains fuse t ype is 20 x 5mm 250V HBC time-lag with the following rating:

In addition, the two transformer s ar e individually fused inside the power supply. To access these fuses remove the cover as described above; both f uses are clipped to the small PCB which is fitted directly onto the pins of t he IEC inlet connector itself.

The correct fuse type is 20 x 5mm 250V HBC time-lag with the following rating:

Make sure that only fuses with the required current r ating and of the specified type are used for replacement. The use of makeshift fuses and the short-circuiting of fuseholders are prohibited.

Mains Lead

Connect the instrument to the AC supply using the mains lead provided. Should a mains plug be required for a different mains outlet socket, a suitably rated and appr oved mains lead set should be used which is fitted with the required wall plug and an IEC60320 C13 connector for the instrument end. To determine the minimum current rating of the lead-set for the intended AC supply, refer to the power rating information on the equipment or in the Specification.

Any interruption of the mains earth conductor inside or outside the instrument will make the instrument dangerous. Intentional interruption is prohibited.

Mounting

This instrument is suitable both for bench use and rack mounting. It is delivered with feet for bench mounting. The front f eet include a tilt mechanism for optimal panel angle.

A rack kit for mounting QL Series power supplies is available from the Manufacturers or their overseas agents. The rack will accommodate 1, 2 or 3 single units or a tr iple and single unit; a blanking piece is also available for unused positions in the rack.

Ventilation

The power supply is cooled by an intelligent multi-speed fan which vents at the rear. Take care not to restrict the air inlets at the side panels or the exit at the rear. In rack-mounted situations allow adequate space around the instrument and/or use a fan tray for forced cooling.

WARNING! THIS INSTRUMENT MUST BE EARTHED.

Front Panel Connec tions

The loads should be connected to the positive (red) and negat ive (black ) terminals marked OUTPUT 1, OUTPUT 2, o r AUX.

Remote sense connections to the loads on Outputs 1 or 2, if required, are made from t he corresponding positive (+) and negative (−) REMOTE SENSE term inals. Rem ot e s ense operation is selected from the keyboard or via a remote control interface (P models only); the REMOTE SENSE lamp is lit when remote sense is selected. Switching off remote sense returns the instrument to local sensing at the output terminals.

The terminal marked

is connected to the chassis and safety earth ground.

Rear Panel Connections

Main Output Te r m inals (P models only)

The output and sense terminals are duplicated on the rear panel screw-terminal block marked Output +, Output −, Sense + and Sense − ; these connections are paralleled with their front panel equivalents.

Connections

Remote sense operation is selected from the keyboard or via a remote control interface. When the rear panel terminals are used, remote sens e should always be selected to ensure t hat output regulation is maintained within specification.

Auxiliary Output Terminals (T models only)

The front panel AUX OUTPUT terminals are duplicated on the rear panel with screwless terminals marked AUXILIARY OUTPUT.

GND

Signal ground

No internal connection

Alarm Outputs

Associated with each main output are recessed 2-pin connectors marked Alarm. These provide access to an opto-isolated NPN switching transistor, the function of which can be set f rom the keyboard, see the Alarm Output section of this manual.

The maximum operating voltage that can be applied across t he t er minals is 20VDC and the maximum sink current for t he s witch 'closur e' is 1m A.

Do not apply external voltages between the terminals exceeding 30VDC.

RS232 (P models only)

9−pin female D−connector with pin connections as shown below. Can be connected to a standard PC port using a fully wired 1:1 male-female cable without any cross-over connections.

Pin Name Description

1 RI 2 TXD Transmitted data from instrument 3 RXD Received data to instrument 4 CTS

Passively asserted (+V through 10kΩ)

Signal ground is connected to instrument ground.

USB (P models only)

The USB port is connected to instrument ground. It conforms with USB 2.0 (Full Speed) and accepts a standard USB cable. The Windows plug-and-play funct ions should aut om at ically recognise that the instrument has been c onnected. If the correct driver is not found, follow the Windows on-screen prompts and install the required files from the CD supplied.

LAN (P models only)

The LAN interface is designed to meet LXI ( Lan eXtensions for Instrumentation) version 1.2; the instrument is Class C compliant. Remote control using the LAN interface is possible using a TCP/IP Socket protocol. The instrument also contains a basic Web server which provides information on the unit and allows it to be configur ed. Since it is possible to misconfigure the LAN interface, making it impos sible to c om m unicat e with the inst r um ent over LAN, a LAN Configuration Initialise (LCI) mechanism is pr ovided via a recessed switch on the rear panel (marked LAN RESET) to reset t he unit t o t he factory default.

Further details are given in the Remote Operation chapter. For more information on LXI standards refer to www.lxistandard.org/home

6 RTS

Passively asserted (+V through 10kΩ) 7 DSR No internal connection 8 DTR

GPIB (P models only)

The GPIB signal grounds are connect ed to the instrument ground. The implemented subsets are:

The GPIB address is set fr om t he front panel.

SH1 AH1 T6 TE0 L4 LE0 SR1 RL2 PP1 DC1 DT0 C0 E2

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