IET Labs HARS-X Series, User And Service Manual

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2 SPECIFICATION
HARS Series
Chapter 2
SPECIFICATIONS
For convenience to the user, the pertinent specifications are given in an OPERATING GUIDE affixed
to the case of the instrument. Figure 2.1 shows a typical example.
Accuracy: After subtraction of zero resistance, at 23°C;
traceable to NIST.
HARS-X: ±(0.01% + 2 m
Ω
)
HARS-A: ±(0.05% + 2 m
Ω
)
HARS-Q: ±(0.02% + 2 m
Ω
)
Zero Resistance: <1 m
Ω
per decade, at dc; slightly higher
for 7-10 decades.
Maximum Voltage to Case: 2000 V peak.
Switch Type: 11 positions; "0"-"10"; multiple solid silver alloy contacts.
Switch Capacitance: <4 pF per switch, low-loss.
Terminals: Low-thermal-emf beryllium-copper binding posts with
standard 3/4 inch spacing, plus shield terminal; connections on the
rear of the instrument are available ( RO option). Single decade units
have solder-terminal connections.
SPECIFICATIONS
Resistance Total Stability Long Term Temperature Max. Maximum Maximum
per Decade Stability Coefficient Power current voltage
Step Resistance (±ppm/year) (±ppm/3 years) (±ppm/°C) (W/step) (per decade) (per step)
1 m
Ω Ω
Ω Ω Ω
10 m
Ω
100 700 50 0.025 5 A 5 mV
10 m
Ω Ω Ω Ω Ω
100 m
Ω
50 350 20 0.2 4 A 40 mV
100 m
Ω Ω
Ω Ω
Ω
1
Ω
30 50 20 0.25 1.6 A 0.16 V
1
Ω Ω Ω Ω Ω
10
Ω
10 25 20 0.6 0.8 A 0.8 V
10
Ω Ω Ω Ω Ω
100
Ω
10 25 15 0.6 0.25 A 2.5 V
100
Ω Ω
Ω Ω
Ω
1 k
Ω
10 25 5 0.6 80 mA 8 V
1 k
Ω Ω Ω Ω Ω
10 k
Ω
10 25 5 0.5 23 mA 23 V
10 k
Ω Ω Ω Ω Ω
100 k
Ω
10 25 5 0.5 7 mA 70 V
100 k
Ω Ω
Ω Ω
Ω
1 M
Ω
10 25 5 0.5* 2.3* mA 230 V*
1 M
Ω Ω Ω Ω Ω
10 M
Ω
10 25 10 0.5* 0.7* mA 700 V*
10 M
Ω Ω Ω Ω Ω
100 M
Ω
25 40 10 0.1* 0.1* mA 1000 V*
*Subject to maximum of 2000 V.
Model Dimensions Weight
1 decade 7.7 cm W x 7.7 cm H x 8.4 cm D 0.45 kg
(3" x 3" x 3.3") (1.0 lb)
2-4 decades 37.5 cm W x 8.9 cm H x 10.2 cm D 1.7 kg
(14.8" x 3.5" x 4") (3.8 lb)
5 decades 2.0 kg (4.3 lb)
6 decades 43.9 cm W x 8.9 cm H x 10.2 cm D 2.2 kg
(17.3" x 3.5" x 4") (4.8 lb)
7 decades 2.4 kg (5.3 lb)
8 decades 2.6 kg (5.7 lb)
9 decades 48.3 cm W x 17.8 cm H x 19.7 cm D 5.1 kg
(19.0" x 7.0" x 7.8") (11.2 lb)
10 decades 5.3 kg (11.7 lb)