2
HARS-X and X2
2
Specifi cations
Chapter 2
SPECIFICATIONS
For convenience to the user, the pertinent speci
fi
cations are given in an
OPERATING GUIDE
af
fi
xed to the
case of the instrument. Figure 2.1 shows a typical example.
Accuracy:
≤
1 M
Ω
steps:
±(0.01% + 2 m
Ω
)
10 M
Ω
steps:
±0.03%
After subtraction of zero- resistance, at 23°C;
traceable to SI
Zero resistance:
≤
1 M
Ω
steps:
≤
1 m
Ω
per decade
10 M
Ω
steps:
≤
3 m
Ω
Switch type:
Multiple solid silver alloy contacts, continuous
rotation
Switch capacitance:
<1 pF between contacts
SPECIFICATIONS
Operation:
If switches have not been operated for an extended
period of time, they should be rotated a few times
in both directions to restore contact resistance to
speci
fi
cations.
Environmental conditions:
Operating conditions:
+10 to +40°C, <80% RH
Storage conditions:
-20 to +65°C
Terminals:
3 Low-thermal-emf tellurium-copper binding
posts with standard 3/4 inch spacing, plus shield
terminal; connections on the rear of the instrument
are available (RO option). -K Option: Kelvin
connection is available as an option with 5 binding
posts
Resistance
per step
Total
decade
resistance
Stability
(±ppm/yr)
Long-term
stability
(±ppm/3 yrs)
Temperature
coeffi cient
(±ppm/°C)
Resistor type
HARS-X
HARS-X2
Max
current
Max
voltage
(per step)
Max power
(per step)
Max
current
Max
voltage
(per step)
Max power
(per step)
1 m
Ω
10 m
Ω
50
75
50
Resistance
wire
8.0 A
5 mV
0.04 W
9.0 A
9 mV
0.08 W
10 m
Ω
100 m
Ω
50
75
20
4.0 A
40 mV
0.16 W
6.3 A
63 mV
0.4 W
100 m
Ω
1
Ω
50
75
20
1.6 A
0.16 V
0.25 W
2.2 A
0.3 V
0.5 W
1
Ω
10
Ω
20
25
20
Wirewound,
non-inductive
0.8 A
0.8 V
0.6 W
1.1 A
1.1 V
1.2 W
10
Ω
100
Ω
20
25
15
0.25 A
2.5 V
0.6 W
0.35 A
3.5 V
1.2 W
100
Ω
1 k
Ω
20
25
5
80 mA
8 V
0.6 W
110 mA
11 V
1.2 W
1 k
Ω
10 k
Ω
20
25
5
23 mA
23 V
0.5 W
35 mA
35 V
1.2 W
10 k
Ω
100 k
Ω
20
25
5
7 mA
70 V
0.5 W
11 mA
110 V
1.2 W
100 k
Ω
1 M
Ω
20
25
5
2.3 mA*
230 V*
0.5 W*
3 mA*
500 V*
1 W*
1 M
Ω
10 M
Ω
20
25
5
0.7 mA*
700 V*
0.5 W*
1 mA*
1000 V*
1 W*
10 M
Ω
100 M
Ω
50
100
10
Metal oxide fi lm
0.1 mA*
1000 V*
0.1 W*
0.1 mA*
1000 V*
0.1 W*
*Subject to maximum of 2000 V to case
