Krohn-Hite 526 Operating Manual

Model 526

Precision DC Source/Calibrator ±100nV to ±111V ±10nA to ±111mA

Operating Manual

Service and Warranty

Krohn-Hite Instruments are designed and manufactured in accordance with sound engineering practices and

should give long trouble-free service under normal operating conditions. If your instrument fails to provide

satisfactory service and you are unable to locate the source of trouble, contact our Service Department at (508)

580-1660, giving all the information available concerning the failure.

DO NOT return the instrument without our written or verbal authorization to do so. After contacting us, we

will issue a Return Authorization Number which should be referenced on the packing slip and purchase order.

In most cases, we will be able to supply you with the information necessary to repair the instrument, avoiding

any transportation problems and costs. When it becomes necessary to return the instrument to the factory,

kindly pack it carefully and ship it to us prepaid.

All Krohn-Hite products are warranted against defective materials and workmanship. This warranty applies

for a period of one year from the date of delivery to the Original Purchaser. Any instrument that is found

within the one year warranty period not to meet these standards, will be repaired or replaced. This warranty

does not apply to fuses or batteries. No other warranty is expressed or implied.

Krohn-Hite Corporation reserves the right to make design changes at any time without incurring any

obligation to incorporate these changes in instruments previously purchased.

Modifications to this instrument must not be made without the written consent of an authorized employee of

Krohn-Hite Corporation.

Model 526

Precision DC Source/Calibrator

Operating Manual

Revision 3.2, Published 6/13, Printed in U.S.A.

15 Jonathan Drive, Unit 4, Brockton, MA 02301-5566

Tel: (508) 580-1660; Fax: (508) 583-8989

sales@Krohn-hite.com; www.krohn-hite.com

Table of Contents

526 Table of Contents

SECTION 1.0 GENERAL DESCRIPTION AND SPECIFICATIONS ..............1-1

1.1 Introduction ....................................1-1

1.2 Specifications ...................................1-2

1.2.1 Voltage Mode Specifications ......................1-2

1.2.2 Current Mode Specifications ......................1-3

1.2.3 GPIB Programming ..........................1-3

1.2.4 Terminals ................................1-4

1.2.5 Modes Of Operation ..........................1-4

1.2.6 Special Features ............................1-4

1.2.7 General Specifications .........................1-4

1.2.8 Safety..................................1-5

1.2.9 Electromagnetic Compatibility .....................1-5

1.2.10 Mechanical Specifications .......................1-5

1.2.11 General Information ..........................1-5

1.2.12 Accessories ..............................1-5

1.2.13 Options .................................1-5

1.2.14 Optional Accessories ..........................1-5

SECTION 2.0 OPERATION ...................................2-1

2.1 Introduction ....................................2-1

2.2 Selecting Line Voltage ..............................2-1

2.3 Placement and Rack Mounting..........................2-3

2.4 Quick Start.....................................2-3

2.4.1 526 Tones ...............................2-3

2.4.2 LOCAL Key...............................2-4

2.4.3 SELECTOR Knob ...........................2-4

2.4.4 Setting a Voltage/Current .......................2-4

2.4.4.1 Decade Controls .......................2-4

2.4.5 Selecting a Range ...........................2-4

2.4.6 Recalling Memory Set-Ups.......................2-5

2.4.7 Saving Set-Ups into Memory......................2-5

2.4.8 Front Panel Output Terminals .....................2-6

Table of Contents

2.4.9 Rear Panel Connectors ........................2-7

2.5 Front Panel Controls ...............................2-8

2.5.1 Membrane Keys ............................2-8

2.6 Display Information ...............................2-12

2.6.1 Mode .................................2-12

2.6.2 Memory ................................2-13

2.6.3 Comm .................................2-13

2.6.4 Output Limits (V-mA) .........................2-13

2.6.5 Compliance Limits (VOLTS) .....................2-13

2.6.6 Sense Wires .............................2-14

2.6.7 Output Settings ............................2-14

2.6.8 Output .................................2-14

2.7 Menu and Selector Knob Control........................2-14

2.7.1 Menu 1 - View Set-Up ........................2-15

2.4.8.1 HV Led ............................2-6

2.4.8.2 Wire Connections .......................2-6

2.4.9.1 IEEE-488 Connector .....................2-7

2.4.9.2 Optional LAN Connector (Option: LAN) ............2-7

2.4.9.3 Power Entry Module .....................2-7

2.4.9.4 Rear Panel Output Connector and Mating Connector.....2-8

2.4.9.5 Chassis Ground/Safety Ground................2-8

2.5.1.1 [ENTER/STORE] Key.....................2-8

2.5.1.2 [RECALL] Key ........................2-9

2.5.1.3 [EDIT] Key ..........................2-9

2.5.1.4 [LOCAL] Key .........................2-9

2.5.1.5 [+/-] POLARITY Key .....................2-10

2.5.1.6 [DOWN] and [UP] RANGE Keys ...............2-10

2.5.1.7 [VOLTS/MILLI AMP] Key ..................2-10

2.5.1.8 [CROWBAR] Key ......................2-11

2.5.1.9 [2W SENSE 4W] Key ....................2-11

2.5.1.10 [UPDATE OUTPUT] Key ..................2-11

2.5.1.11 [MENU] Key .........................2-11

2.7.1.1 Port Setting View ......................2-15

2.7.1.2 Voltage Limits View .....................2-16

2.7.1.3 Current Limit View ......................2-16

2.7.1.4 Compliance Voltage View ..................2-16

2.7.1.5 Power On Sequence View ..................2-16

2.7.1.6 Full or Partial Display View..................2-17

Table of Contents

2.7.1.7 Pass Thru Zero View ....................2-17

2.7.1.8 Remote Protocol View ....................2-17

2.7.1.9 Exiting To Main Level ....................2-18

2.7.1.10 Exiting Menu and Returning To Local Operation.......2-18

2.7.2 Menu 2 - Port Selection........................2-18

2.7.2.1 IEEE-488 (GPIB) ......................2-19

2.7.2.2 LAN (Optional)........................2-20

2.7.3 Menu3-VOutput Limit........................2-20

2.7.4 Menu 4 I Output Limit ........................2-22

2.7.5 Menu 5 V Compliance Limit (Fail Safe)...............2-23

2.7.5.1 Changing V Compliance Limit ................2-23

2.7.6 Menu 6 - Power-On Set-Up......................2-24

2.7.6.1 Changing Power-On Set-Up Setting .............2-25

2.7.7 Menu 7 - Display Area........................2-26

2.7.7.1 Changing Display Area Setting ...............2-26

2.7.8 Menu 8 - Pass Thru Zero ......................2-27

2.7.8.1 Changing Pass Thru Zero Setting:..............2-27

2.7.9 Menu 9 - CLR User Memory ....................2-28

2.7.9.1 Clearing User Memory....................2-28

2.7.10 Menu 10 - Remote Protocol .....................2-28

2.7.11 Changing Remote Protocol Setting ..................2-29

2.8 Overloading ...................................2-29

SECTION 3.0 526 (STD) GPIB PROGRAMMING .......................3-1

3.1 Introduction ....................................3-1

3.2 Krohn-Hite (Std) Programming Protocols....................3-1

3.3 IEEE-488 (GPIB) Programming..........................3-2

3.3.1 Interface Capabilities ..........................3-2

3.3.2 Setting The Instrument’s Address ...................3-2

3.3.3 Interface Messages ..........................3-2

3.3.3.1 “MLA” - My Listen Address. ..................3-2

3.3.3.2 “MTA” - My Talk Address ...................3-2

3.3.3.3 “UNL” Unlisten ........................3-2

3.3.3.4 “IFC” Interface Clear .....................3-2

3.3.3.5 “Power-On” Clear .......................3-2

3.3.4 Group Commands ...........................3-3

3.3.5 Output Data Byte String Format ....................3-4

3.3.5.1 Examples of Data Strings/Output Results ...........3-5

iii

Table of Contents

3.3.6 Talk Enable Modes...........................3-5

3.3.7 C or c (Compliance Limit) .......................3-5

3.3.8 *RST or *rst (Power-Up Reset) ....................3-5

3.3.9 S or s (Status) .............................3-5

3.3.10 M or m (Set Memory)..........................3-8

3.3.11 L or l (Output Limit) ...........................3-8

3.3.12 *IDN? or *idn? .............................3-8

3.3.13 ? (What's Wrong Query) ........................3-8

3.3.14 "What’s Wrong" Request ........................3-8

3.3.15 Programming Examples ........................3-9

SECTION 4.0 MODEL 522 GPIB PROGRAMMING ......................4-1

4.1 Introduction ....................................4-1

4.2 IEEE-488 Programming Protocol ........................4-1

4.2.1 Interface Messages. ..........................4-2

4.2.2 Groups of Commands .........................4-2

4.2.3 Talk Enable Modes...........................4-2

4.2.4 Responses ...............................4-3

4.2.5 Data Byte String Format.........................4-3

4.2.6 What’s wrong request, ("?") ......................4-4

4.2.7 Programming ..............................4-4

4.2.8 IEEE-488 Addressing .........................4-5

SECTION 5.0 MODEL 8200 GPIB PROGRAMMING .....................5-1

5.1 Analogic/Data Precision Protocol ........................5-1

5.1.1 8200 Protocol Programming Examples ................5-2

5.1.2 Address Setting ............................5-3

5.1.3 2-Wire/4-Wire Operation ........................5-3

SECTION 6.0 LAN (LOCAL AREA NETWORK) OPERATION ................6-1

6.1 Introduction ....................................6-1

6.2 Local Area Networks ...............................6-1

6.2.1 Site LANs and Private LANs ......................6-1

6.2.2 Connecting Through a Network ....................6-1

6.2.3 Connecting Directly to the Model 526 (no network) ..........6-1

6.2.4 How to Find the Current IP Address:..................6-1

6.2.5 Setting a Fixed IP Address.......................6-3

6.2.6 LAN and HyperTerminal Setup ....................6-6

6.2.6.1 How to Set-Up and Run WindowsÒ HyperTerminal .....6-6

Table of Contents

SECTION 7.0 INCOMING ACCEPTANCE ...........................7-1

7.1 Introduction ....................................7-1

7.2 Warm-Up Time...................................7-1

7.3 Required Test Equipment ............................7-1

7.4 Preliminary Set-Up ................................7-1

7.5 Verification Procedure ..............................7-2

7.5.1 Output Voltage Checks.........................7-2

7.5.2 Output Current Checks (using PCR100 Precision Resistor)......7-3

Table of Contents

Warranty, Service and Safety

Krohn-Hite Instruments are designed and manufactured in accordance with sound engineering practices and should give long trouble-free service under normal operating conditions. If your instrument fails to provide satisfactory service and you are unable to locate the source of trouble, contact our Service Department at (508) 580-1660, giving all the information available concerning the failure.

DO NOT return the instrument without our written or verbal authorization. When contacting us, we will issue a Return Authorization Number that should be referenced on the packing slip and purchase order. In most cases, we will be able to supply you with the information necessary to repair the instrument, avoiding any transportation problems and costs. When it becomes necessary to return the instrument to the factory, kindly pack the instrument carefully and ship it to us prepaid.

All Krohn-Hite products are warranted against defective materials and workmanship. This warranty applies for a period of one year from the date of delivery, to the Original Purchaser. Any instrument that is found within the one-year warranty period not to meet these standards will be repaired or replaced. This warranty does not apply to fuses or batteries. No other warranty is expressed or implied.

Krohn-Hite Corporation reserves the right to make design changes at any time without incurring any obligation to incorporate these changes in instruments previously purchased.

Modifications to this instrument must not be made without the written consent of an authorized employee of Krohn-Hite Corp.

Claims

Immediately upon arrival, purchaser shall check the packing container against the enclosed packing list and shall, within thirty days of arrival, give Krohn-Hite notice of shortages or any non-conformity with the terms of the order.

The purchaser assumes all risk of loss or damage to instrument upon delivery by Krohn-Hite to the carrier. If an instrument is damaged in transit, purchaser must file all claims for damage with the carrier to obtain compensation. Upon request by purchaser, Krohn-Hite will submit an estimate of cost to repair shipment damage.

vii

Warranty, Service and Safety

SAFETY ISSUES

Warning

HIGH VOLTAGE is used in the operation of this instrument. LETHAL voltages may be present on the output terminals. Please observe all safety precautions when operating this instrument.

Power Source

The Model 526 is intended to operate from a 105V to 130V or 210V to 260V ac rms source. A protective ground connection by way of the grounding conductor in the power cord is essential for safe operation.

Proper Fuse

To avoid damage to the Model 526 or to prevent a fire hazard, use the correct fuse for the line voltage selected. Proper fuse requirement is screened on the rear panel of the instrument above the power connector.

The Model 526 has been designed, tested and supplied in a safe condition. The following general safety precautions must be observed during all phases of operation, service, and repair. Failure to comply with these precautions or with specific warnings elsewhere in this manual violates safety standards of design, manufacture and intended use of this instrument. Krohn-Hite assumes no liability for the customer’s failure to comply with these requirements.

This manual contains information and warnings that must be observed to keep the instrument in a safe condition and ensure safe operation. Operation or service in conditions or in a manner other than specified could compromise safety. For the correct and safe use of this instrument, operating and service personnel must follow generally accepted safety procedures.

To avoid injury or fire hazard, do not switch on the instrument if it is damaged or suspected to be faulty. Do not use the instrument in damp, wet, condensing, dusty or explosive gas environments.

Whenever it is likely that safety protection has been impaired, make the instrument inoperative and secure against any unintended operation, and then inform qualified personnel. Safety protection is likely to be impaired if, for example, the instrument shows visible damage, or fails to operate normally.

Ground The Instrument

To minimizeshock hazard, the instrument chassis and cabinet must be connected to an electrical ground. Any interruption of the protective ground conductor inside or outside the instrument is likely to make the instrument dangerous. Intentional interruption is prohibited.

Protective Earth Ground

Protective earth symbol located on the inside rear chassis near the AC line filter module designate the point at which thesafety earth system is attached to the chassis. The symbol must not be altered or removed. The safety earth wires (green/yellow) must never be disconnected. The safety earth ground wires (green/yellow) connecting the module must make direct contact with the chassis.

viii

The following are symbols used on the chassis of the 526:

---- Chassis Protective Ground

---- AC (Alternating Current)

---- Conforms to European Union Directives

---- Important Information, Refer to the Manual

Warranty, Service and Safety

---- Caution, Risk of Electric Shock

Do Not Operate In An Explosive Area

Do not operate the instrument in the presence of flammable gases or fumes. Operation of any electrical instrument in such an environment constitutes a definite safety hazard.

Keep Away From Live Circuits

Operating personnel must not remove instrument covers. Qualified maintenance personnel must make component replacement and internal adjustments. Under certain conditions, dangerous voltages may exist. To avoid injuries, always disconnect input voltages before removing the covers.

Do Not Substitute Parts or Modify Instrument

Because of the danger of introducing additional hazards, do not install substitute parts or perform any unauthorized modifications. Return the unit to the Krohn-Hite Service Department to modify or repair the instrument to ensure that safety features are maintained.

Do Not Operate a Damaged Instrument

Whenever it is possible that the safety protection features built into this instrument have been impaired, either through physical damage, excessive moisture, or any other reason, REMOVE the POWER and do not use the instrument until safe operation can be verified by service-trained personnel. If necessary, return the instrument to the Krohn-Hite Service Department for service and repair to ensure that the safety features are maintained.

Warranty, Service and Safety

Do Not Remove Cover

To avoid personal injury, do not remove the covers of the Model 526. There are no user-serviceable parts inside the instrument, so there is no reason for any user to remove the covers of this instrument.

Unpacking and Inspection

The Model 526 has been shipped in a container designed to prevent any damage from occurring during shipping. Inspect the 526 carefully for damage, and immediately report any damage to the shipper.

If you need to return the 526 for any reason, use the original container if possible. If not, you can order a new container from Krohn-Hite Corporation at (508) 580-1660 indicating the model and serial number.

Figure 1 Model 526 Precision DC Source/Calibrator

Section 1 - General Description and Specifications

SECTION 1

General Description and Specifications

1.1 Introduction

The Krohn-Hite Model 526 Precision DC Voltage/Current Source/Calibrator is a highly stable and repeatable DC voltage and DC current source providing N.I.S.T. traceable voltages and currents for use in production, calibration labs, QA and QC departments, design labs, or any place where an accurate voltage and current source is needed.

The 526 provides accurate voltages from ±100nVdc to ±111.1110Vdc to within 20ppm for 1 year, and precise currents from ±10nA to ±111.1110mA to within 50ppm for 1 year. It is an extremely quiet source with <6μVrms of noise measured over a 10Hz to 100kHz bandwidth.

Decade Control

Microprocessor assisted decade control allows for continual use of one decade with full carry and borrow capability to and from all more significant decades for easier use and convenient manual operation. Monotonic and linear A/D measurements can be made at any resolution using only one decade control.

Display and Front Panel Controls

A user friendly 2-line 40 character display and six front panel decade switches with full carry and borrow, allow for fast accurate voltage and current settings. Output settings can be modified using the front panel decade switches and the range keys. Output 2-wire, 4-wire operation is accomplished with one keystroke or over GPIB/LAN. A crowbar function places the output in a safe mode when desired. The 526 output can be set to 0 volts, allowing the output sense to maintain a true 4-wire low impedance output.

Ranges and Resolution

The 526 provides four voltage ranges of 100mV, 1V, 10V and 100V with a resolution of 100nV, 1μV, 10μV and 100μV respectively. Two current ranges provide 10mA and 100mA with a resolution of 10nA and 100nA respectively.

Non-Volatile Memory

Up to 32 storage locations are provided with the 526, that can be recalled at any time.

Voltage and Current Limits

Selecting voltage and current limits to prevent users from damaging sensitive circuitry or devices under test may be set from the front panel from ±0V to ±112V or 1mA to 112mA.

Output Voltage or Current Compliance Limits

A hardware fail safe compliance limits can be set in the Model 526. Settable limits are: 120V, 36V, 26V or 16V.

1-1

Section 1 - General Description and Specifications

Remote Control

The 526 provides for GPIB and LAN (optional) remote control. Rear panel connectors are provided that allow connection to a computer. Programming Krohn-Hite and Analogic/DP 8200 protocols are built into the firmware, allowing the 526 to be used in any system with the older Model 521/522 and Analogic/DP Model

8200.

Applications

The 526 is well suited for a variety of applications such as: the design, check and calibration of high speed, high resolution A/D converters; design and certification of high speed data logging and process control systems; calibration of digital voltmeters and multimeters; as an “IMBEDDED STANDARD” and/or simulator; design, testing, simulation and certification of thermocouples, strain gages and transducer instrumentation. It is also a replacement for the Analogic Model 8200.

1.2 Specifications

1.2.1 Voltage Mode Specifications

Specifications apply at 23ºC ±1ºC, <70% relative humidity.

Range Full Scale Resolution

100mVdc ±111.1110mVdc 100nVdc

1.0Vdc ±1.111110Vdc 1μVdc

10Vdc ±11.11110Vdc 10μVdc

100Vdc ±111.1110Vdc 100μVdc

Short Circuit Current: 200mA max.

Absolute Accuracy

±(ppm of setting + μV)

Range Full Scale

100mVdc ±111.1110mVdc 20 + 3

1.0Vdc ±1.111110Vdc 20 + 5

10Vdc ±11.11110Vdc 20 + 52

100Vdc ±111.1110Vdc 20 + 500

24 Hour Stability *

Range

* 24 hour stability applies at 23ºC, ±1ºC

100mVdc ±3 + 1.5

1Vdc ±3 + 1.5

10Vdc ±3 + 10

100Vdc ±3 + 100

±(ppm of setting + μV)

1Year

Current

(dc)

100mA 20μ

(ohms)

Temperature Coefficient: 18ºC to 28ºC, ±5ppm of setting, ±1ppm of range/ºC; operating limit, ±10ppm of setting, ±2ppm of range/ºC.

Settling Times: 100mV, 1V and 10V range, 2ms; 100V range, 15ms; range changes, 35ms.

Line Regulation: ±2ppm of setting for a 10% line fluctuation.

1-2

Section 1 - General Description and Specifications

Load Regulation 4-Wire operation: <±2ppm + 1μV of setting from no load to 100mA full load. Measurements must be made at sense lead connection point to the load.

Noise and Ripple (rms):

Bandwidth

Range

100mVdc 2μVp-p 6μVrms

1Vdc 2μVp-p 10μVrms

10Vdc 4μVp-p 20μVrms

100V 40μVp-p 100μVrms

1.2.2 Current Mode Specifications

Range Full Scale

10mAdc ±11.11110mAdc 50 + 50

100mAdc ±111.1110mAdc 50 + 200

0.1Hz to 10Hz 10Hz to 100kHz

Absolute Accuracy

±(ppm of setting + nA)

1Year

Voltage

Range Full Scale Resolution

10mAdc ±11.11110mAdc 10nAdc 100Vdc

100mAdc ±111.1110mAdc 100nAdc 100Vdc

Noise and Ripple (rms):

Bandwidth

Range

10mAdc 25nAp-p 150nArms

100mAdc 100nAp-p 300nArms

Temperature Coefficient: 18ºC to 28ºC, ±5ppm of setting, ±1ppm of range/°C; operating limit, ±10ppm of setting, ±2ppm of range/°C.

Maximum Output Current: ±111mA. Output protected from damage with a current limiter. Output may be shorted to ground indefinitely.

Line Regulation: ±2ppm of setting for a 10% line fluctuation.

Compliance Voltage Effect: <±2ppm + 1μV of setting for a 90V change in compliance voltage change.

1.2.3 GPIB Programming

Subsets: SH1, AH1, T6, L4, SR1, RL0, PP1, DC0, DT0, E1.

0.1Hz to 10Hz 10Hz to 100kHz

Compliance

Line Termination: The GPIB EOI signal is always sent with the last character on a line.

Talker Function: Allows interrogation of the Model 526 by a controller.

Communications Data Rate: Typically 5ms without range change, 45ms with range change.

1-3

Section 1 - General Description and Specifications

1.2.4 Terminals

Output Terminals are mounted on both the front and rear panels (rear panel includes a mounted 6-pin Amphenol military style connector, mate supplied). Front terminals are 5 way, gold, low thermal, binding posts on ¾" centers. Only one set of terminals may be used at a time. Front and rear terminal sets are configured for remote sensing of the output as follows:

High Output and High Sense Low Output and Low Sense Chassis Ground

1.2.5 Modes Of Operation

Local (LCL): Allows full front panel control.

Recall (RCL): Allows viewing and outputting stored front panel set-ups from memory locations 01 thru 32.

Edit (EDT): Allows for editing any memory location from 01 to 32.

Remote (REM): Indicates when the Model 526 is remotely controlled by IEEE-488 or LAN (optional).

1.2.6 Special Features

Port Selection: Allows setting IEEE-488 port and address or optional LAN port if installed.

Menu Selectable Voltage and Current Limits: Allows setting a voltage limit from 0V to 112V, each

polarity and/or a current limit from 0mA to 112mA, each polarity.

Failsafe Hardware Voltage Clamp (Compliance) Limits: Allows setting a hardware clamp voltage. Selections are 120V, 36V, 26V and 16V, ±5% and ±1V.

Power-On Start Sequence: Allows setting the power-on condition to factory default set-up or last setting.

Display Area: Allows partial display of output voltage or full display.

Pass Thru Zero: Allows voltage and current decade controls to pass thru zero.

Remote Protocol: Allows setting remote programming protocol to be Krohn-Hite or Analogic 8200.

1.2.7 General Specifications

Power Requirements: Line voltage, 105 to 130 or 210 to 260 volts ac, single phase, 50Hz/60Hz, 60 watts max.

Warm-Up Time (from cal temp): 2 hour to rated accuracy.

Display: 2 line, 40 character, LCD. Displays output settings and other pertinent information.

Pushbutton Keys: Membrane.

Isolation: Power transformer-to-analog output, control logic-to-analog output, optically isolated, 100Vdc to chassis.

Protection: Voltage mode, short-circuit and over-load protected. Current mode, open circuit protected. Indication by display message. Crowbar, once overload is detected.

Temperature:

Operating Limit: 0°C to 50°C Calibration: 23ºC ±1ºC Storage: –40°C to 85°C.

1-4

Section 1 - General Description and Specifications

1.2.8 Safety

The Model 526 is designed to meet the requirements of the following standards of safety for electrical equipment for measurement, control and laboratory use: IEC61010-1, EN61010-1.

1.2.9 Electromagnetic Compatibility

Emissions and Immunity: EN61326-1, EMC, 61000-4-2; ESD, 61000-4-3; Radiated Immunity,61000-4-4; EFT, 61000-4-5; Surge, 61000-4-6; Conducted Immunity, 61000-4-8; Magnetic Immunity, 61000-4-11; Voltage Interruption EN61010-1.

CE Compliant for Class B Equipment.

1.2.10 Mechanical Specifications

Dimensions and Weights: 4“ (10.28cm) high with feet, 3.5" (9cm) high without feet; 14.15" (36.36cm) wide;

14.3” (36.75cm) deep; 12 lbs (5.4kg) net, 14 lbs (6.3kg) shipping.

1.2.11 General Information

Certification: A Certificate of Compliance is issued with each new instrument to certify the calibration and traceability to N.I.S.T.

Warranty: ONE FULL YEAR warranty on parts and labor includes specifications and performance.

1.2.12 Accessories

Rear output connector with clamp. USA type 3 terminal line cord. CD operating manual.

1.2.13 Options

Extended 1 Year Warranty: Part No. EW526.

LAN: Local Area Network to remotely control the Model 526 by a computer.

1.2.14 Optional Accessories

RK-314: Rack Mount Kit permits the installation of the Model 526 into a 19” rack spacing.

PCR100: Precision 100 Ohm Resistor.

1-5

Section 1 - General Description and Specifications

CAB-005: Cable, multi-stacking double banana plug, two conductor shielded balance line.

CAB-018: Cable, multi-stacking double banana plug.

CAB-023: Cable Set, Low Thermal EMF Retractable Banana. The CAB023 is a low thermal EMF retractable

sheath banana plug patch cord set. These low thermal cables minimize thermal errors so accurate low voltage measurements can be made. Each set includes 2 test leads (one black and one red).

1-6

Section 1 - General Description and Specifications

CAB-024: Cable set, low thermal EMF spade lug. The CAB024 is a low thermal EMF spade lug patch cord set for low voltage measurements. These low thermal cables minimize thermal errors so accurate low voltage measurements can be made. Each set includes 2 test leads (one black and one red).

CON13/15: 6-pin Amphenol military style output connector, clamp supplied.

Case-2720B: Carrying Case

Specifications are subject to change without notice.

1-7

Section 1 - General Description and Specifications

NOTES

_____________________________________________________________________________

1-8

Section 2 - Operation

SECTION 2

OPERATION

2.1 Introduction

NOTE: CAPITALIZED names represent the display area and Selector knob. A [BRACKET] signifies keys.

The Model 526 Precision DC Voltage/Current Source/Calibrator is a highly stable and repeatable DC voltage and DC current source providing N.I.S.T. traceable voltages and currents for use in production, calibration labs, QA and QC departments, design labs, or any place where an accurate voltage and current source is needed. This section will describe each control and function of the Model 526.

WARNING

The 526 Source/Calibrator can supply lethal voltages. To avoid shock hazard, read this section before operating the unit.

2.2 Selecting Line Voltage

The 526 operates from a line voltage of 105 to 130 or 210 to 260 volts ac, single phase, 50Hz/60Hz, 60 watts max. The following paragraphs explain how to change the voltage settings and the fuse.

CAUTION

To avoid shock hazard, connect the factory supplied three conductor line power cord to a properly grounded power outlet. Do not use a two-conductor adapter or extension cord; this will break the protective ground connection. Use the rear-panel CHASSIS GROUND terminal for a protective grounding wire if there is any question about the effectiveness of instrument earth grounding through the power line cord ground wire.

The cover of the Power Entry Module shows four possible voltage settings (100V, 120V, 230V or 240V). Notice that a pin will be in one of these holes, indicating the present voltage setting for the 526. The 526 will NOT operate with voltages than those indicated in the table below.

AC Mains Pin

105V - 130V 100V or 120V

210V - 260V 230V or 240V

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Section 2 - Operation

If this setting does not match the voltage available at your site, then it must be changed before powering on the

526. Figure 2.1 shows an example setting for 120 Vac operation.

Figure 2.1 Example 120V Setting

Follow the steps below to change a fuse or convert the operating voltage of a 526.

1. Set the 526 power switch to OFF.

2. Unplug the power cord from the ac wall outlet and from the power cord receptacle on the power entry module. See Figure 2.2.

3. Using a small flat blade screwdriver or similar tool inserted into the slot at the left edge of the cover, carefully pry the cover off the fuse cavity.

4. To change the voltage setting, grasp the white plastic voltage select board pin and pull straight outward

until the voltage select board unseats from the power entry module. Hold the board so that you can read

the four voltage selection labels (100, 120, 230 and 240) imprinted on the board. Move the voltage

indicator pin to the opposite side of the board from the desired voltage label. Be sure to seat the pin in the notch provided on the board’s edge. Install the voltage select board so that it is fully seated in the voltage

select cavity (the label side toward the fuse cavity).

5. To change the fuse (s), remove the fuse (s) from the fuse carrier on the back of the cover. For 100 or 120 Vac operation, the fuse rating is ¾ Amp, Slo-Blo. For 230 or 240 Vac operation, the fuse rating is 3/8 Amp, Slo-Blo. Be sure to use the correct rating for your voltage selection. For installation, insert the fuse(s) of the proper rating into the fuse carrier.

6. To change the fuse arrangement to match that used in your country, remove the screw from the fuse

carrier, remove the fuse carrier, turn the fuse carrier so that the desired fuse arrangement (single fuse or dual fuses) is facing outward, installthe fuse carrier, and install the screw. For United States type power

operation, use a single standard AGC or 3AG 0.25 inch x 1.25 inches fuse of the correct rating. For European type power operation, use two standard 5.2 mm x 20 mm fuses of the correct rating. For European use, it is important to note that if your local electrical code does not allow a dual fuse

arrangement, then a dummy fuse must be installed in the lower fuse carrier. Otherwise, the 526 will not

operate.

7. Place the cover on the power entry module and press inward until it snaps into place. Verify that the desired operating voltage is indicated with the voltage select board pin on the cover label.

8. Connect the power cord to the power entry module and wall outlet. The 526 is now ready to be operated on the selected ac line voltage.

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Section 2 - Operation

Figure 2.2 Power Entry Module

2.3 Placement and Rack Mounting

You may place the 526 on a bench top or mount it in a standard-width, 24-inch (61-cm) deep equipment rack. For bench-top use, the 526 is equipped with non-slipping, tilt, non-marring feet. To mount the 526 in an equipment rack, use the Rack Mount Kit, Model RK-314.

2.4 Quick Start

After the 526 has been unboxed and set to the proper line voltage setting, the unit is ready to turn on. Plug the 526 into the power source and turn on.

The first time turned on, the 526 will display the factory default settings. The OUTPUT display should indicate "ACTIVE". If not, press the [CROWBAR] key. Now turn the decade knobs to the desired voltage.

NOTE: When the 523's Power-On setting is set for LAST LCL SETTING, the output terminals will be

crowbarred. Press the [CROWBAR] key to activate output terminals after power-on.

2.4.1 526 Tones

The 526 has a tone generator that beeps when an entry has been made, a non-active key was pressed, or an entry that was to exceed a limit was attempted. The short beep means the entry was correct. A long beep indicates the attempted entry was already selected or incorrect.

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Section 2 - Operation

2.4.2 LOCAL Key

Pressing the [LOCAL] key will always return the 526 to the last local setting, whether it be from remote operation or from within a MENU FUNCTION.

2.4.3 SELECTOR Knob

The SELECTOR knob control is used to select a memory location for recalling or storing front panel set-ups; or is used to select/set items from within the MENU Mode. It is always active in the LCL Mode for selecting memory locations. The memory location viewed does not become active at the output terminals until [RECALL] and [UPDATE OUTPUT] is pressed.

2.4.4 Setting a Voltage/Current

To set a voltage or current, do the following in LCL mode.

1. Check if LCL is displayed in the MODE display. If not, press [LOCAL]

2. Press the [V/mA] key to set the desired FUNCTION of voltage or current.

When pressed, the OUTPUT SETTING display indicates mV or mA and the OUTPUT display indicates CROWBAR. This is done to protect the unit under test (UUT), that may be connected

to the 526, from damage.

3. Press [+/-] key to select positive or negative voltages/currents.

4. To set the desired range press [DOWN] or [UP] RANGE keys.

The LED's between the 3 MSD decades are decimal place indicators (see para 2.4.5).

NOTE: When changing the range from a higher range to a lower range and the voltage/current

exceeds the maximum limit for the new range, the 526 sets the voltage/current to the maximum

limit for the new range. If you change to a higher range, the 526 will maintains the same voltage from the previous or lower range.

5. Turn the decade controls, below the display, to set the desired voltage/current.

6. Press [CROWBAR] to activate the output terminals. The OUTPUT display now indicates ACTIVE.

2.4.4.1 Decade Controls

Six microprocessor assisted decade controls provide continual use of any one decade with full carry and borrow capability to and from all more significant decades for easier use and convenient manual operation. Decade controls will only function when setting a voltage or current.

2.4.5 Selecting a Range

To set the desired range press [DOWN] or [UP] RANGE keys. The LED's between the 3 MSD decades are decimal place indicators. Below is a chart showing each range LED.

Indicates 100mV, 100V or 100mA Range is set.

OUTPUT SETTING display will indicate either XX.XXXXmV, XX.XXXXV or X.XXXXmA.

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Krohn-Hite 526 Operating Manual

Specifications and Main Features

Frequently Asked Questions

User Manual