742A Series
Instruction Manual
Specifications
Table 1 lists specification for the available 742A Series Resistance Standards.
Table 1. 742A Series Resistance Standard Specifications
Model
Nominal
Resistance
at 23
°
C
Time Stability
Calibration
Uncertainty
Maximum
Deviation
from the
23
°
C
Value (18
to 28
°
C)
Maximum
Current
(Voltage)
+1 PPM
Error
Adder
When
Current
Exceeds
the
Following
180
Day
1 Year
742A-1
1
Ω
±
5.0 ppm
±
8.0 ppm
±
1.0 ppm
3.0 ppm
500 mA
(500 mV)
200 mA
742A-1.9
1.9
Ω
±
5.0 ppm
±
8.0 ppm
±
1.0 ppm
3.0 ppm
200 mA
(380 mV)
100 mA
742A-10
10
Ω
±
5.0 ppm
±
8.0 ppm
±
1.0 ppm
3.0 ppm
100 mA
(1 V)
20 mA
742A-100
100
Ω
±
4.0 ppm
±
6.0 ppm
±
1.0 ppm
3.0 ppm
20 mA
(2 V)
5 mA
742A-1 k
1 k
Ω
±
4.0 ppm
±
6.0 ppm
±
1.5 ppm
2.0 ppm
10 mA
(10 V)
2 mA
742A-10 k
10
Ω
±
2.5 ppm
±
4.0 ppm
±
1.0 ppm
1.5 ppm
3 mA
(30 V)
600
µ
A
742A-19 k
19
Ω
±
2.5 ppm
±
4.0 ppm
±
1.5 ppm
2.0 ppm
1.5 mA
(28.5 V)
600
µ
A
742A-100 k
100 k
Ω
±
4.0 ppm
±
6.0 ppm
±
2.5 ppm
2.0 ppm
1 mA
(100 V)
400
µ
A
742A-1 M
1 M
Ω
±
6.0 ppm
±
8.0 ppm
±
5.0 ppm
2.0 ppm
100
µ
A
(100 V)
100
µ
A
742A-10 M
10 M
Ω
±
6.0 ppm
±
9.0 ppm
±
10.0 ppm
3.0 ppm
20
µ
A
(200 V)
20
µ
A
742A-19 M
19 M
Ω
±
8.0 ppm
±
10.0 ppm
±
20.0 ppm
4.0 ppm
10
µ
A
(190 V)
10
µ
A
General Specifications:
Accuracy:
The initial resistance is trimmed to
±
2 ppm of nominal. The measured value is
printed on the rear panel.
Retrace Error (Hysteresis):
23
°
C-18
°
C-23
°
C cycle: Negligible resistance shift
23
°
C-28
°
C-23
°
C cycle: Negligible resistance shift
23
°
C-0
°
C-23
°
C cycle: <2 ppm resistance shift
23
°
C-40
°
C-23
°
C cycle: <2 ppm resistance shift
Operating Temperature Range:
23
±
5
°
C
Storage Temperature Range:
0 to 40
°
C
Report of Calibration:
The report of calibration includes a table of resistance values
in 0.5
°
increments from 18 to 28
°
C.
Size:
8.6 cm H x 10.5 cm W x 12.7 cm L (including binding posts)
(3.4 in H x 4.15 in W x 5 in L (including binding posts))
Binding posts; 2.5 cm (1.0 in)
Weight:
0.68 to 0.91 kg (1.5 to 2.0 lbs), depending on model
2
