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| 型號： | BS407 |
| 英文描述： | Glass Passivated Rectifier Diodes |
| 中文描述： | 沙漠 |
| 文件頁數(shù)： | 1/1頁 |
| 文件大?。?/td> | 25K |
| 代理商： | BS407 |
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-
solvefairlylowresistances,butitdoessobyresolvingextremelylowvolt-
ages(typicallyonenano-voltpermicro-ohm),makingitsubjecttosevere
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).
Forspeedandconveniencefrontpanelswitchesareprovidedforcurrent
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-
chargeablebatteries.Thebatterychargerisbuiltintotheinstrumentand
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
.
Thisunusuallywiderangemakesitsuitableforagreatervarietyofappli-
cations than other micro-ohmmeters.
A front panel operated ‘clamp’ switch is available to limit the maximum
voltageacrosstheunknownto20mV. Thisisarequirementforthemea-
surement of switch contact resistances to international standards.
High resolution and accuracy
Withalowestrangeof1999μ
theBS407canresolveonemicro-ohm.
Precision analogue circuitry ensures a high measurement accuracy of
up to 0.1% of reading ± 1 digit.
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.
o
C to 28
o
C after a
Range
Resolu-
tion
1 μ
10 μ
100 μ
1 m
10 m
100 m
1
10
Test Cur-
rent
250 mA
50 mA
10 mA
5 mA
500 μA
50 μA
50 μA
10 μA
F.S. Volt-
age
500 μV
1 mV
2 mV
10 mV
10 mV
10 mV
100 mV
200 mV
Accuracy
1999 μ
19.99 m
199.9 m
1999 m
19.99
199.9
1999
19.99 k
± 0.1% r ± 0.4% scale
± 0.1% r ± 0.2% scale
± 0.1% r ± 0.1% scale
± 0.1% r ± 0.1% scale
± 0.1% r ± 0.1% scale
± 0.1% r ± 0.1% scale
± 0.1% r ± 0.1% scale
± 0.1% r ± 0.2% scale
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
18 mV ± 2mV with 20mV Clamp Active
< 6V with 20mV Clamp Inactive
Compliance
> 1V (> 0.5V on 1999μ
range).
Complianceisthe maximumvoltagethatcanbetoleratedfromadditional
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:
3.5 digit LCD with 12.5mm characters.
Casing:
ABS casing with metal tilt stand giving 15
Power:
230V or 115V ±14% 50/60Hz, adjustable internally;
20VA max. Installation Category II.
Operating Range: +5
Storage Range:
-10
Environmental:
Indoor use at altitudes to 2000m, Pollution Degree 2.
Electrical Safety:
Complies with EN61010-1.
EMC:
Complies with EN61326.
Size:
220(W) x 82(H) x 230(D) mm, (10.3 x 3.4 x 9.2")
excluding feet and tilt stand.
Weight:
1.3 kg (3lb).
ACCESSORIES
SUPPLIED
Kelvin Test Clip Leads, Operating Manual, IEC Mains Lead
OPTIONAL
Carrying Case
o
angle.
C to + 40
o
C to +65
C, 20% to 80% RH.
o
C
BS407
Wide range precision micro-ohmmeter
Thurlby Thandar Instruments Ltd. operates a policy of continuous development
and reserves the right to alter specifications without prior notice.
Designed and built in the EEC by:
Thurlby Thandar Instruments Ltd
.
Glebe Road, Huntingdon. Cambs. PE29 7DR United Kingdom
Tel: +44 (0)1480 412451
Fax: +44 (0)1480 450409
e-mail: sales@tti-test.com Web: http://www.tti-test.com
●
High basic accuracy of 0.1%
●
Wide measurement range of 1 mcro
to 20k
●
Current reversal switch for detecting thermal emf effects
●
Current diversion switch for easy zero setting
●
Four termnal measurement using Kelvin clip leads
●
Battery operation with built-in charger
●
Switchable 20mV clamp for ‘dry circuit’ testing
THURLBY THANDAR INSTRUMENTS
50
μ
ZEROADJUST
SENSE
FORCE
UNKNOWN
T
i
T
BS407 PRECISION MILLI/MICRO OHMMETER
19.99 199.9
1999
Operate
Set
250mA 50mA 10mA 5mA
Polarity
1999
1999 19.99
19.99 199.9
+
_
Charge
Forceon
ForceCurrent
20mV
μ
μ
μ
500 A
50 A
50 A
10 A
Off
On
to20k
1
μ
m
k
μ
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