Time Electronics 1040 Manual de usuario

User Manual

1040

Resistance Decade Box

Version 1.2

11-22

Time Electronics Ltd

Unit 5, TON Business Park, 2-8 Morley Road,

Tonbridge, Kent, TN9 1RA, United Kingdom.

T: +44 (0) 1732 355993 | F: +44 (0) 1732 350198

mail@timeelectronics.co.uk | www.timeelectronics.com

Nothing from this manual may be multiplied, or made public in any form or manner, either

electronically or hard copy, without prior written consent from Time Electronics Ltd.

This also applies to any schematics, drawings and diagrams contained herein.

This manual provides operating and safety instructions for the Time Electronics product.

To ensure correct operation and safety, please follow the instructions in this manual.

Time Electronics reserves the right to change the contents, specifications and other

information contained in this manual without notice.

Time Electronics

1040 Resistance Decade Box User Manual

Contents

1Introduction....................................................................................................................................2

2Specifications ................................................................................................................................3

3Operation........................................................................................................................................4

3.1 Safety Precautions ................................................................................................................................4

3.2 Front Panel Controls and Connections..................................................................................................4

3.3 Operating Instructions ........................................................................................................................... 5

3.4 Resistance Setting Table....................................................................................................................... 7

4Maintenance and Repair ...............................................................................................................8

5Warranty and Servicing................................................................................................................. 9

Time Electronics

1040 Resistance Decade Box User Manual

1Introduction

A wide range resistance decade box designed to meet the requirements of both industry and

education. The 1040 is compact and durable, housed in a robust metal case with removable

protective rubber cover, making it ideal for use in either the laboratory or field. Excellent

accuracy (mid-scale 0.1 %) is achieved by using high stability metal film resistors.

The 8-digit thumbwheel switch enables simple and precise setting with a clear indication of

the resistance value. To make selecting and reading the setting easy the 1040 incorporates

colour-coded digits: megohms - red, kilohms - yellow, ohms - white.

Special attention has been given to maximize the reliability of operation. A special multiple

gold contact switch arrangement ensures that a back-up contact is always available to take

over should a failure occur.

For connections the unit features safety terminals that are compatible with 4 mm shrouded

plugs, as well as standard plugs, bare wires, and spade terminals.

The 1040 comes fitted with an ergonomic rubber cover providing increased protection and

durability. It has a textured grip for comfortable handling, and side openings to place labels.

It is easy to remove if you prefer a stand-alone unit or to use the optional 9026 carry case.

Features

•1 Ω to 100 MΩ

•High accuracy

•Clear visual indication

•High stability

•Low temperature coefficient

•Safety terminals

•Removable protective cover

•Suitable for industry or education

Time Electronics

1040 Resistance Decade Box User Manual

2Specifications

Resistance range ..................1 Ω to 100 MΩ in 1 Ω steps

Decade

(9 steps each) 1 Ω 10 Ω100 Ω 1 kΩ 10 kΩ 100 kΩ 1 MΩ 10 MΩ

Accuracy ± 1 % ± 0.5 % ± 0.1 % ± 0.1 % ± 0.1 % ± 0.1 % ± 0.1 % ± 1 %

Max current DC 0.5 A 0.3 A 100 mA 30 mA 3 mA 0.3 mA 30 μA 3 μA

Max voltage DC 4.5 V 27 V 90 V 250 V 250 V 250 V 250 V 250 V

Max current RMS 0.354 A 0.212 A 70.66 mA 19.56 mA 1.96 mA 0.196 mA 19.56 μA 1.96 μA

Max voltage RMS 3.2 V 19.1 V 63.6 V 176 V 176 V 176 V 176 V 176 V

NOTE: On all ranges, the maximum applied voltage is proportional to the set point, keeping the current at or

below the maximum specified. The maximum voltage of 250 V DC or 176 V RMS cannot be exceeded.

Residual resistance ................ Less than 250 mΩ (< 31.25 mΩ / decade).

Power rating ............................ 1 watt per resistor.

Voltage rating .......................... Maximum 250 V DC, 176 V AC RMS.

Current rating .......................... Maximum 0.5 A DC, 0.36 A AC RMS.

Temperature coefficient ......... 50 ppm/°C.

Connections ............................ 2 x 4 mm active safety terminals. A third safety terminal is to

enable the case to be earthed or connected to either output.

Dimensions.............................. W200 x H75 x D110 mm

(215 x 100 x 120 mm including supplied protective cover).

Weight ...................................... 0.6 kg (1.0 kg including protective cover)

Options .................................... Calibration certificates, carry case.

Ordering Information

1040 .......................................... Resistance Decade Box

9026 .......................................... Carry case (replaces protective cover)

C161 ......................................... Traceable calibration certificate (Factory)

C114 ......................................... Accredited calibration certificate (ISO 17025)

Time Electronics

1040 Resistance Decade Box User Manual

3Operation

3.1 Safety Precautions

Observe proper safety operational guidelines when working with high voltages.

To minimize shock hazard connect the case terminal to an electrical ground.

Always take precautions to avoid and prevent contact with live components.

Handle the unit with care and use as per the instructions in this manual.

3.2 Front Panel Controls and Connections

•Resistance Terminals: Resistance is connected via the safety terminal binding

posts that are suitable for twisted stripped wire compression connection, spade

terminals, or by 4 mm shrouded or normal plug insertion.

•Case Terminal: The case terminal is isolated from the two active resistance

terminals. When connected to ground/earth, it may be used as a guard or shield

connection, this can help to reduce unwanted electrical noise pickup, and help

maintain the case at a safe voltage in certain modes of use.

•Resistance Setting Switches: Used for selecting the required resistance by setting

the thumbwheel digit switches to the value of the decade range. Each decade can be

set from 0 to 9.

Case

Terminal

Resistance

Terminals

Resistance Setting Switches

(8 decades)

Time Electronics

1040 Resistance Decade Box User Manual

3.3 Operating Instructions

3.3.1 Connections

Connection to the decade box is via 4 mm safety terminal posts, using 4 mm shrouded or

standard plugs. Alternatively, crocodile clips or stripped wire connections can be used.

Whatever method is used, the connection must be tight to the terminal posts to avoid

introducing unwanted additional resistance.

The red and black active terminals connect to the resistance elements, and the green

terminal is connected to the case for screening purposes.

For certain applications, the user may want to connect the case terminal to either

of the active terminals. This can be done, but the case would then be at the same

potential as the active terminals. The user should be aware that this could be

hazardous and safety precautions must be taken to prevent electric shock.

Time Electronics

1040 Resistance Decade Box User Manual

3.3.2 Setting Resistance

Before use it is recommended that all the thumbwheels are rotated completely 2 times.

This will ensure the contacts are self-cleaned, maximizing their low contact resistance.

This is particularly beneficial if the decade box has not been used for a long time.

The 1040 features colour-coded digits to help provide a clear indication of the set values.

•Megohms (10 MΩ, 1 MΩ decades) = Red.

•Kilohms (100 kΩ, 10 kΩ, 1 kΩ decades) = Yellow.

•Ohms (100 Ω , 10 Ω, 1 Ω decades) = White.

To set resistance, use the thumbwheel digit switches to set the required values according to

the decade ranges.

For example, to set 1040 Ω:

•Set the 10MΩ/1MΩ/100kΩ/10kΩ decades to 0.

•Set the 1 kΩdecade to 1.

•Set the 100 Ωdecade to 0.

•Set the 10 Ωdecade to 4.

•Set the 1 Ωdecade to 0.

For a quick reference to the setting values of the 1040, please see the Resistance Setting

Table on the following page.

Note: All resistance boxes have a residual resistance, meaning that when the decades are set to zero

a small resistance remains. If you are making precision measurements or recalibrating the instrument,

this residual value must be subtracted from all measurements.

Typical values of residual resistance are shown in the specifications.

For precise values relating to your specific unit, refer to calibration certificate (if ordered).

Time Electronics

1040 Resistance Decade Box User Manual

3.4 Resistance Setting Table

The below table shows the settings of each resistance decade using the switches.

10 MΩ

Decade

1 MΩ

Decade

100 kΩ

Decade

10 kΩ

Decade

1 kΩ

Decade

100 Ω

Decade

10 Ω

Decade

1 Ω

Decade

Digit ΩDigit ΩDigit ΩDigit ΩDigit ΩDigit ΩDigit ΩDigit Ω

0 0 Ω 0 0 Ω 0 0 Ω 0 0 Ω 0 0 Ω 0 0 Ω 0 0 Ω 0 0 Ω

1 10 MΩ1 1 MΩ1 100 kΩ

1 10 kΩ 1 1 kΩ 1 100 Ω 1 10 Ω 1 1 Ω

2 20 MΩ2 2 MΩ2 200 kΩ

2 20 kΩ 2 2 kΩ 2 200 Ω 2 20 Ω 2 2 Ω

3 30 MΩ3 3 MΩ3 300 kΩ

3 30 kΩ 3 3 kΩ 3 300 Ω 3 30 Ω 3 3 Ω

4 40 MΩ4 4 MΩ4 400 kΩ

4 40 kΩ 4 4 kΩ 4 400 Ω 4 40 Ω 4 4 Ω

5 50 MΩ5 5 MΩ5 500 kΩ

5 50 kΩ 5 5 kΩ 5 500 Ω 5 50 Ω 5 5 Ω

6 60 MΩ6 6 MΩ6 600 kΩ

6 60 kΩ 6 6 kΩ 6 600 Ω 6 60 Ω 6 6 Ω

7 70 MΩ7 7 MΩ7 700 kΩ

7 70 kΩ 7 7 kΩ 7 700 Ω 7 70 Ω 7 7 Ω

8 80 MΩ8 8 MΩ8 800 kΩ

8 80 kΩ 8 8 kΩ 8 800 Ω 8 80 Ω 8 8 Ω

9 90 MΩ9 9 MΩ9 900 kΩ

9 90 kΩ 9 9 kΩ 9 900 Ω 9 90 Ω 9 9 Ω

Time Electronics

1040 Resistance Decade Box User Manual

4Maintenance and Repair

Overload Considerations

To avoid overload, power dissipation in the resistive elements must be kept below 1 W.

To achieve this the maximum current must not exceed those shown for each decade in the

specifications table. Current will be proportional to the applied voltage. The maximum

allowed working voltage that can be applied at the maximum setting for each decade is also

shown in the specifications.

If multiple decades are being used, the current must not exceed that of the lowest rated

decade. For example, if you set 7152 Ω, the 1 kΩ decade has the lowest current rating at

30 mA. Therefore the current flowing through the decade box must not exceed 30 mA.

Repair

NOTE: No repair work should be undertaken by the customer while the instrument is under warranty, as such

work may render the warranty invalid.

Certain precision components used in this instrument are not readily available and make

repairs by the customer difficult if these components are damaged. You should only use

Time Electronics original parts to ensure the unit meets the stated specifications.

Dismantling the Instrument

Remove the protective rubber cover. Then removal of four case screws enables the metal

cover to be taken off, enabling access to all parts of the instrument.

Spare Parts List

Part #

Description

Part #

Description

017-1900

1 Ω resistor

094-9562

1 Ω decade assembly

017-1913

10 Ω resistor

094-9563

10 Ω decade assembly

017-1914

100 Ω resistor

094-9564

100 Ω decade assembly

017-1915

1 kΩ resistor

094-9565

1 kΩ decade assembly

017-1916

10 kΩ resistor

094-9566

10 kΩ decade assembly

017-1917

100 kΩ resistor

094-9567

100 kΩ decade assembly

017-0001

1 MΩ resistor

094-9568

1 MΩ decade assembly

017-1919

10 MΩ resistor

094-9569

10 MΩ decade assembly

062-0060

4 mm red terminal

090-9015

Case metal cover

062-0061

4mm black terminal

9026

Carry case

062-0062

4 mm green terminal

9028

Protective rubber cover

063-6323

Pair of tolec bank ends & fixing clips

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