2
HARS-LX Series
2
Specifications
Chapter 2
SPECIFICATIONS
For convenience to the user, the pertinent specifications are given in a typical
OPERATING GUIDE
, like the
one shown in Figure 2.1, affixed to the case of the instrument.
SPECIFICATIONS
*At 23°C “true ohm” measurement, 30-70% RH, absolute reading, SI traceable; no zero subtraction required
Minimum resistance:
With this design, absolute accuracy,
without
zero subtraction, is accomplished by having a
minimum settable resistance
, which includes
all contact and wiring resistances.
Absolute
accuracy applies for every setting. The minimum
resistance is determined by the lowest resolution
of the unit and by internal resistance. See
Model
Information
for the minimum settable resistance
for any model. Minimum settable resistance is
implemented by a mechanical stop in one of the
decades.
Resistance repeatability:
Less than 100 µΩ, short-term, average value.
Leakage resistance:
>10 GΩ
Environmental conditions:
Operating temperature:
0ºC to 55ºC
Storage temperature:
-40ºC to 70ºC
Switch type:
Multiple solid silver contacts; dust-tight diallyl-
phthalate body.
To allow continuous rotation, a blank position is
added on most decades.
Resistor type:
Wirewound, hermetically sealed,
low-inductance
Terminals:
Four, 5-way, gold-plated, tellutium-copper binding
posts with low thermal emf and low resistance,
for four-terminal Kelvin measurements, plus one
binding post connected to case for shielding.
Rear outputs are available as an option.
An additional Kel-F washer is added under the
High and Low binding posts for decade boxes
that have a 10 M
Ω
/step decade.
Range and resolution:
See Model Information
Resistance
per step
Total
decade
resistance
Max current Max power Temperature
coefficient
(±ppm/ºC)
Power
coefficient
(±ppm/mW)
Accuracy*
Stability
(±ppm/yr)
Decade positions
Resistor type
whichever applies first
100 μ
Ω
division
20 μ
Ω
resolution
(-RH Option)
10 m
Ω
2 A
NA
20
1
Continuous
Rheostat
1 m
Ω
10 m
Ω
2 A
NA
20
1
±(20 ppm+0.5
m
Ω
)
20 ppm+0.5 m
Ω
11 positions "0"-"10"
Resistance wire
10 m
Ω
100 m
Ω
2 A
NA
20
1
10 positions "1"-"10"
(10 m
Ω
minimum reading)
100 m
Ω
1
Ω
2 A
NA
20
1
11 positions "0"-"10"
(12 positions "0"-"11" for
highest decade, where
highest decade steps are
1
Ω
, 10
Ω
, 10 k
Ω
, 100
k
Ω
, 1 M
Ω
, and 10 M
Ω
.)
See Ordering Information
section below.
1
Ω
10
Ω
1 A
5 W
20
0.4
Wirewound
hermetically sealed
low-inductance
10
Ω
100
Ω
0.33 A
5 W
10
0.3
100
Ω
1 k
Ω
0.1 A
5 W
3
0.1
1 k
Ω
10 k
Ω
33 mA
5 W
3
0.1
10 ppm
(<5 ppm typical)
10 k
Ω
100 k
Ω
10 mA
5 W
3
0.1
100 k
Ω
1 M
Ω
3 mA
2,000 V peak
3
0.1
1 M
Ω
10 M
Ω
1 mA
2,000 V peak
3
0.1
10 M
Ω
100 M
Ω
2,000 V peak
15
0.2
±0.02%
50 ppm
Metal oxide
Wiring and switch resistance
NA
50 µ
Ω
/ºC
0.2 µ
Ω
/W
NA