BS407 AIM-TTI INSTRUMENTS, BS407 Datasheet

BS407

Manufacturer Part Number

BS407

Description

MICRO OHM METER

Manufacturer

AIM-TTI INSTRUMENTS

Datasheet

1.BS407.pdf (1 pages)

Specifications of BS407

Resistance Measuring Range

1ÂµR To 20kR

Resolution

1Âµohm

Test Current

250mA

External Height

82mm

External Width

219mm

External Depth

240mm

Weight

1.5kg

Svhc

No SVHC (15-Dec-2010)

Accuracy %

0.1%

External

RoHS Compliant

Resolution (ohm)

1Âµohm

Rohs Compliant

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A dedicated but versatile instrument

The BS407 is an instrument which is fully optimised for the task of accu-

rate measurement of low resistances with a best resolution of 1µ .

Most multimeters offer a best resolution which is at least one thousand

poorer than this. A very high resolution multimeter may attempt to re-

solve fairly low resistances, but it does so by resolving extremely low volt-

ages (typically one nano-volt per micro-ohm), making it subject to severe

errors from thermal emf effects and noise.

In contrast, the BS407 generates sufficient test voltage across the un-

known resistance to combat noise and reduce thermal emf effects to

manageable levels. Current reversal can then be used to eliminate any

remaining thermal offset.

Rapid 4-terminal measurement

The BS407 uses a four terminal measurent system via high quality Kel-

vin Clip leads (supplied).

For speed and convenience front panel switches are provided for current

diversion (allowing in-situ zero adjustment) and current reversal (for

identifying thermal emf errors). An LED indicator warns of open circuit

leads thus preventing spurious results from being recorded.

Battery operation with built-in charger

The BS407 is a fully portable instrument which operates from NiMh re-

chargeable batteries. The battery charger is built into the instrument and

can be operated continuously during bench use.

Wide measurement range

The BS407 has eight push-button selected decade measurement

ranges from 1.999m up to 19.99k .

This unusually wide range makes it suitable for a greater variety of appli-

cations than other micro-ohmmeters.

A front panel operated ‘clamp’ switch is available to limit the maximum

voltage across the unknown to 20mV. This is a requirement for the mea-

surement of switch contact resistances to international standards.

High resolution and accuracy

With a lowest range of 1999µ the BS407 can resolve one micro-ohm.

Precision analogue circuitry ensures a high measurement accuracy of

up to 0.1% of reading ± 1 digit.

BS407 Wide range precision micro-ohmmeter

Designed and built in the EEC by:

High basic accuracy of 0.1%

Wide measurement range of 1 micro

Current reversal switch for detecting thermal emf effects

Current diversion switch for easy zero setting

Four terminal measurement using Kelvin clip leads

Battery operation with built-in charger

Switchable 20mV clamp for ‘dry circuit’ testing

Glebe Road, Huntingdon. Cambs. PE29 7DR United Kingdom

e-mail: sales@tti-test.com Web: http://www.tti-test.com

T T

Off

Tel: +44 (0)1480 412451 Fax: +44 (0)1480 450409

Operate

Zero Clamp

Set

BS407 PRECISION MILLI/MICRO OHMMETER

20mV

Thurlby Thandar Instruments Ltd.

Polarity

250mA 50mA 10mA 5mA

1999

19.99 199.9

ZERO ADJUST

THURLBY THANDAR INSTRUMENTS

Force Current

1999

500 A

19.99 199.9

50 A

Force on

Charge

50 A

1999 19.99

to 20k

10 A

UNKNOWN

FORCE

SENSE

to 20 k

RANGES AND ACCURACY

Accuracies apply over a temperature range of 18

warm-up period of 30 minutes, and with the test connections in thermal

equalibrium. Specificied accuracy applies for a period of one year.

FACILITIES

20mV Clamp

Operated by front panel switch. Limits the open circuit voltage across

the unknown to 20mV (+0mV, -4mV) for “dry circuit” testing of switch

and relay contacts. Not available on the 2000 and 20k ranges.

Reverse Polarity

Operated by front panel switch. Reverses the polarity of the test cur-

rent, enabling thermal emf effects to be detected and quantified.

Set Zero

Operated by non-latching front panel switch and rotary offset control.

Diverts the test current way from the unknown allowing zero adjust-

ment to be undertaken with the test leads in place.

MEASUREMENT SOURCE

Source EMF

Compliance

Compliance is the maximum voltage that can be tolerated from additional

resistance in series with the force connections

PROTECTION

The instrument is protected against the back-emf of its own test current

from any inductance.

The instrument is protected against external voltage sources delivering

up to one amp. Protection against greater abuse is provided by

non-flamable fusible resistors.

POWER SOURCE

Battery

Four internal Ni-MH cells (non removable). Operating time depends

upon the test current flowing - >150 hours with no test current, > 8

hours with maximum test current (1999µ range). Low battery indica-

tion in display.

AC Line

Built-in battery charger allows instrument operation while re-charging.

Nominal re-charge time 16 hours.

GENERAL

Display:

Casing:

Power:

Operating Range: +5

Storage Range:

Environmental:

Electrical Safety:

EMC:

Size:

Weight:

ACCESSORIES

SUPPLIED

Kelvin Test Clip Leads, Operating Manual, IEC Mains Lead

OPTIONAL

Carrying Case

Thurlby Thandar Instruments Ltd. operates a policy of continuous development

and reserves the right to alter specifications without prior notice.

19.99 m

199.9 m

1999 m

19.99 k

1999 µ

19.99

199.9

1999

Range

Resolu-

100 m

100 µ

10 m

10 µ

1 m

1 µ

tion

18 mV ± 2mV with 20mV Clamp Active

< 6V with 20mV Clamp Inactive

> 1V (> 0.5V on 1999µ range).

3.5 digit LCD with 12.5mm characters.

ABS casing with metal tilt stand giving 15

230V or 115V ±14% 50/60Hz, adjustable internally;

-10

Indoor use at altitudes to 2000m, Pollution Degree 2.

Complies with EN61010-1.

Complies with EN61326.

220(W) x 82(H) x 230(D) mm, (10.3 x 3.4 x 9.2")

excluding feet and tilt stand.

1.3 kg (3lb).

20VA max. Installation Category II.

C to + 40

C to +65

Test Cur-

250 mA

500 µA

50 mA

10 mA

50 µA

10 µA

5 mA

rent

C, 20% to 80% RH.

F.S. Volt-

100 mV

200 mV

500 µV

10 mV

1 mV

2 mV

age

± 0.1% r ± 0.4% scale

± 0.1% r ± 0.2% scale

± 0.1% r ± 0.1% scale

± 0.1% r ± 0.2% scale

C to 28

Accuracy

C after a

angle.