Time Electronics 1051 User Manual

Time Electronics

1051

Decade Resistance Box

Technical Manual

V1.1a 04/04/11 Time Electronics Ltd

Botany Industrial Estate, Tonbridge, Kent, TN9 1RH

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.TimeElectronics.com

1

C ontents

1. S pecifications ................................................................................................... 2

2. Operation of the 1051 ...................................................................................... 3

3. Controls ............................................................................................................ 4

4. Maintenance and Repair .................................................................................. 5

5. Guarantee & S ervicing ..................................................................................... 6

Manuel Technique (Francais ) ................................................................................. 7

Technisches Handbuch (Deutsch) ....................................................................... 11

Manual Técnico (Italiano) ..................................................................................... 15

All Time Electronics' instruments are subject to continuous development and

improvement and in consequence may incorporate minor detail changes from the

information contained herein.

1051 Technical Manual

1

2

1. S pecifications

Resistance Range: 0.01Ω to 1MΩ in 0.01Ω steps

RANGE

SPEC.

MAX

CURRENT

Zero Residual Resistance: less than 90 mΩ
Residual Resistance Stability: less than 3 mΩ
Maximum Voltage: 250V DC
Power Rating: 1 watt per resistor

Temperature Coefficient: 50 ppm / º C
Connections: 4 mm terminals. A third terminal is to enable the case to be

Dimensions:

(215 x 100 x 120mm including protective boot).

Weight: 0.6 kg (1.0 kg incl. protective boot)
Optional Extras: A carrying case is available for field and industrial applications.

0.01Ω 0.1Ω 1Ω 10Ω 100Ω 1kΩ 10kΩ 100kΩ

10% 5% 1% 0.5% 0.1% 0.1% 0.1% 0.1%

1A 1A 1A 0.3A 0.1A 33mA 10mA 3mA

earthed or connected to either output.

W200 x H75 x D110mm

Ordering Information:

Code

1051
9026
9161
9114

Description

Low Ohm Resistance Box
Leatherette Carry Case
Factory (NPL Traceable) Calibration Certificate
UKAS Calibration Certificate (ISO 1702 5)

1051 Technical Manual

2

3

2. Operation of the 1051

The 1051 is a compact, robust and accurate decade resistance box and will find many
applications in both industry and education. With its low resistance ranges the 1051 is
particularly suitable for simulation of platinum resistance thermometers.

It is imperative that the switch setting should be unambiguous in order to avoid misreading
the set value. To prevent misreading, the 1051 incorporates a unique colour coding system
to divide the setting into 3 groups corresponding to milli-ohms, ohms and kilo-ohms.

Resistance is simulated by dialing the value required using the thumbwheel switches.
This enables precise setting with a clear unambiguous indication.

For example - to simulate a PT100 element at 100ºC this would be 138.50Ω.

• Set the 100Ω bank to 1,

• the 10Ω bank to 3,

• the 1Ω bank to 8,

• the 0.1Ω bank to 5 and

• the 0.01Ω bank to 0.

Connection to the box is via 4 mm banana plugs. Two connections red and black connect to
the resistance and the green terminal connects to the case for screening purposes.

Special attention has been given to the problem of 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.

Note: Remember that all resistance boxes have a residual resistance, i.e. when the dials
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.

1051 Technical Manual

3

3. C ontrols

1 2 3 4

4

1) 8 way Decade Bank Selects Output value of resistance.

2) Black 4mm terminals Resistance output terminal.

3) Red 4mm terminals Resistance output terminal.

4) Grey 4mmTerminal A third terminal is to enable the case to
be earthed or connected to either output.

1051 Technical Manual

4

5

4. Maintenance and Repair

Dismantling the Instrument

Remove rubber protection boot and then removal of four screws enables the cover to be
taken off which provides access to all parts of the instrument.

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 of the precision components used in this instrument are not readily available and
make repairs by the customer difficult if these components are damaged.

Overload conditions can cause a unit failure.

1051 Technical Manual

5

6

5. Guarantee & S ervicing

Guarantee Period
This unit is guaranteed against defects in materials and workmanship for a period of one

year from its delivery to the customer.

We maintain comprehensive after sales facilities and the unit can, if necessary be returned
to us for servicing. During this period, Time Electronics Ltd will, at its discretion, repair or
replace the defective items. For servicing under guarantee, the instrument type and serial
number must always be quoted, together with details of any fault and the service required.
The purchaser of the instrument must prepay all shipping charges. Time Electronics Ltd will
pay return shipping charges.

This guarantee is void if servicing has been attempted by an unauthorised person or agent.
If, during the guarantee period, failure is due to misuse or abuse of the unit, the repair will be
put in hand without delay and charged unless other instructions are received.

Please note that if you require a new UKAS Certificate during the warranty period, this will
be charged at the current rate on our price list.

Service After Guarantee Period

Even after the guarantee period has expired, Time Electronics Ltd., can still service your
instrument. As the manufacturer, we have the specialised knowledge needed to keep your
instrument in peak condition and we also maintain a comprehensive spare parts service.

Please enclose details of the service required and your full company details including a
contact name when returning for servicing.

Returning Instruments

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

Botany Industrial Estate, Tonbridge, Kent, TN9 1RH

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site:

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.

www.TimeElectronics.com

1051 Technical Manual

6