Time Electronics 1040 User manual

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: [phone] | F: [phone]
[e-mail] | www.timeelectronics.com

© 2022 Time Electronics Ltd.
All rights reserved.
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.

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1040 Resistance Decade Box User Manual
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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

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1040 Resistance Decade Box User Manual
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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

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1040 Resistance Decade Box User Manual
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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)

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1040 Resistance Decade Box User Manual
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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)

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1040 Resistance Decade Box User Manual
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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.

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1040 Resistance Decade Box User Manual
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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).

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1040 Resistance Decade Box User Manual
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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

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1040 Resistance Decade Box User Manual
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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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1040 Resistance Decade Box User Manual
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5Warranty and Servicing
Warranty
Time Electronics products carry a one-year manufacturer’s warranty as standard.
Time Electronics products are designed and manufactured to the highest standards and
specifications to assure the quality and performance required by all sectors of industry.
Time Electronics products are fully guaranteed against faulty materials and workmanship.
Should this product be found to be defective, please contact us using the below details.
Inform us of the product type, serial number, and details of any fault and/or the service
required. Please retain the supplier invoice as proof of purchase.
This warranty does not apply to defects resulting from action of the user such as misuse,
operation outside of specification, improper maintenance or repair, or unauthorized
modification. Time Electronics’ total liability is limited to repair or replacement of the product.
Note that if Time Electronics determine that the fault on a returned product has been caused
by the user, we will contact the customer before proceeding with any repair.
Product Registration
You can register your product at: www.timeelectronics.com/contact/product-registration.
Registering your product will enable us to maintain a record of purchase for your warranty.
You can also use the web form to provide feedback about our products and services.
Calibration and Repair Services
Time Electronics offers repair and calibration services for all the products we make and sell.
Routine maintenance by the manufacturer ensures optimal performance and condition of the
product. Periodic traceable or accredited calibration is available.
Contacting Time Electronics
Online:
Please visit www.timeelectronics.com and select Technical Support from the Contact links.
From this page you will be able to send information to the Time Electronics service team
who will help and support you.
By phone:
[phone]
By email:
[email protected]

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1040 Resistance Decade Box User Manual
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Returning Instruments
Prior to returning your product please contact Time Electronics. We will issue a return
merchandise authorization (RMA) number that is to accompany the goods returning.
Further instructions will also be issued prior to shipment. When returning instruments, please
ensure that they have been adequately packed, preferably in the original packing supplied.
Time Electronics Ltd will not accept responsibility for units returned damaged.
Please ensure that all units have details of the service required and all relevant paperwork.
Send the instrument, shipping charges paid to:
Time Electronics Ltd
Unit 5, TON Business Park, 2-8 Morley Road,
Tonbridge, Kent, TN9 1RA.
United Kingdom.
Tel: [phone]
Fax: [phone]
Email: [e-mail]
Web Site: www.timeelectronics.com
Disposal of your old equipment
1. When this crossed-out wheeled bin symbol is attached to a product it means the product is
covered by the European Directive 2002/96/EC.
2. All electrical and electronic products should be disposed of separately from the municipal
waste stream via designated collection facilities appointed by the government or the local
authorities.
3. The correct disposal of your old appliance will help prevent potential negative consequences
for the environment and human health.
4. For more detailed information about disposal of your old appliance, please contact your city
office, waste disposal service or return to Time Electronics.