Section 2
OM6634A-B-02
4 January 2019
2-2
2.2.
RESISTANCE SPECIFICATION
Nominal
Resistance
(
Ω)
Nominal
Initial
Tolerance
(
ppm)
(Note 1)
Stability
over any 24
hour period
(
ppm)
Stability
12 months
(
ppm)
Temperature
Coefficient
(
ppm/°C)
Maximum
Voltage
(volts)
0.001
20
0.4
15
0.04
0.01
0.01
10
0.2
10
0.02
0.03
0.1
10
0.1
4
0.01
0.1
1
10
0.01
2.5
0.005
0.32
10
10
0.01
2.5
0.005
1.0
100
10
0.01
2.5
0.005
3.2
1k
10
0.01
2.5
0.005
10
10k
10
0.01
2
0.005
32
100k
15
0.02
5
0.01
100
1M
25
0.04
5
0.02
320
10M
35
0.2
6
0.2
1000
100M
50
0.5
15
(Note 5)
0.2
1000
Table 2-2: Resistance Specification
Notes:
1.
Nominal initial tolerance is defined as the maximum variation of resistance mean values
as initially adjusted at the point of sale.
2.
Calibrated in ambient conditions of 23 °C, referred to the unit of resistance as maintained
by the National Research Council of Canada or the National Institute of Standards and
Technology, and expressed as a total uncertainty with a coverage factor of k = 2.
3.
Stability is exclusive of the effects of applying power above 20 mW, but not exceeding
the maximum voltage, in terms of hysteresis and short term temperature stabilization.
4.
See section 1.2.2 for specific resistance values installed in various model configurations.
5.
For all ohmic values, except 100 MΩ, 2
nd
year and subsequent years 12 month stability
remains the same. For the 100 MΩ 2
nd
year and subsequent year 12 month stability is
±10ppm.
Summary of Contents for 6634A Resistance Standard
Page 2: ......
