Time Electronics 1040 User Manual

Time Electronics

1040

Decade Resistance Box

Technical Manual

V1.5 25/06/13 Time Electronics Ltd

Botany Industrial Estate, Tonbridge, Kent, TN9 1RH

Tel: [phone] Fax: [phone]

Email: [e-mail]

Web Site: www.TimeElectronics.com

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Contents

1. Specifications ................................................................................................... 2

2. Operation of the 1040 ...................................................................................... 3

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

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

5. Guarantee & Servicing ..................................................................................... 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.

1040 Technical Manual

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1. Specifications

Resistance Range: 1

2

Ω to 100MΩ in 1Ω steps

RANGE

SPEC.

MAX

CURRENT

Zero Residual Resistance: less than 250 m

Power Rating: 1 watt per resistor. Metal film resistors are used through out.

Maximum Working Voltage: 250 volts DC/AC RMS.

Maximum Current : 0.5 amp DC, 0.36 amp AC (RMS).

Temperature Coefficient: 50 ppm per ºC

Connections: 4 mm terminals. A third terminal is to enable the case to be

Construction: The case is of robust metal construction finished in two-tone

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.

1Ω 10Ω 100Ω 1kΩ 10kΩ 100kΩ 1MΩ 10MΩ

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

0.5A 0.3A 100mA 30mA 3mA 0.3mA 0.03mA 3µA

Ω

earthed or connected to either output.

blue and black.

W200 x H75 x D110mm

Code

1040

9026

9161

9114

Description

Wide Range Resistance Box

Leatherette Carry Case

Factory (NPL Traceable) Calibration Certificate

UKAS Calibration Certificate (ISO 17025)

1040 Technical Manual

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2. Operation of the 1040

The 1040 is a compact, robust and accurate decade resistance box designed to meet the
needs of both industry and education. Housed in a robust metal case, the compact
construction makes it easily portable.

Metal film resistors are used to obtain the high stability and low temperature co-efficient.

It is imperative that the switch setting should be unambiguous in order to avoid misreading
the set value. To prevent misreading, the 1040 incorporates a unique colour coding system
to divide the setting into 3 groups corresponding to ohms, kilohms and megohms.

Resistance is simulated by dialling the value required using the thumbwheel switches. This
enables precise setting with a clear unambiguous indication. For example—to simulate

3k83 set the 1k bank to 3, the 100Ω bank to 8 and the 10Ω bank to 3, all the other dials set

to zero.

Connection to the box is via 4mm terminal posts, 4mm plugs or stripped wire connections
can be used.

The red and black terminals connect to the resistance and the grey terminal is connected 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.

1040 Technical Manual

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3. Controls

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.

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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.

1040 Technical Manual