Signametrics
8
2.2 DC Current Measurement
Input Characteristics
Number of built-in shunts
Two
Currents greater than 2.4A
require external shunt
Protected
with 2.5A Fast blow fuse
Accuracy ± (% of r Amps) [1]
Range Full
Scale
Reading
Resolution Max
Burden
Voltage
24 hours
23
C
5
C
90 Days
23
C
5
C
One Year 23
C
5
C
2.4 mA
2.40000 mA
10
A
25mV
0.05 + 300
A
0.06 + 700
A
0.07 + 1
A
24 mA
24.0000 mA
100
A
250mV
0.05 + 350
A
0.065 + 800
A
0.08 + 1
A
240 mA
240.000 mA
1
A
55mV
0.05 + 50
A
0.055 + 60
A
0.065 + 80
A
2.4 A
2.40000 A
10
A
520mV
0.3 + 60
A
0.4 + 70
A
0.45 + 90
A
[1] With reading rate set to < 2/sec, and within one hour from Zero (Relative control).
2.3 Resistance Measurements
Characteristics
Number of current sources
Five
Maximum Test Voltage
2.4V
2.3.1 2-wire
Accuracy ± (% of r
) [1]
Range Full
Scale
6 ½ Digits
Resolution Source
current
24 hours
23
C
1
C
90 Days
23
C
5
C
One Year
23
C
5
C
240
240.0000
100
1 mA
0.004 + 4.5 m
[2]
0.005 + 5 m
[2]
0.008 + 6 m
[2]
2.4 k
2.400000 k
1 m
1 mA
0.0025 + 28 m
0.004 + 32 m
0.007 + 33 m
24 k
24.00000 k
10 m
100
A
0.003 + 300 m
0.004 + 330 m
0.007 + 350 m
240 k
240.0000 k
100 m
10
A
0.008 + 3.2
0.012 + 4
0.02 + 5
2.4 M
2.400000 M
1
1
A
0.02 + 40
0.03 + 50
0.04 + 70
24 M
24.0000 M
100
100 nA
0.2 + 400
0. 3 + 500
0.4 + 600
[1] With reading rate set to < 2/sec, and within one hour from Self Calibration (S-Cal).
[2] Use of S-Cal and Relative to improve measurement floor.
2.3.2 4-wire
Accuracy ± (% of r
) [1]
Range
[3]
Full Scale
6 ½ Digits
Resolution Source
current
24 hours
23
C
1
C
90 Days
23
C
5
C
One Year
23
C
5
C
240
240.0000
100
1 mA
0.004 + 3 m
[2]
0.005 + 4 m
[2]
0.008 + 5 m
[2]
2.4 k
2.400000 k
1 m
1 mA
0.0025 + 28 m
0.004+ 32 m
0.007 + 33 m
24 k
24.00000 k
10 m
100
A
0.003 + 300 m
0.004 + 330 m
0.007 + 350 m
240 k
240.0000 k
100 m
10
A
0.008 + 3.2
0.012 + 4
0.02 + 5
[1] With reading rate set to < 2/sec, and within one hour from Self Calibration (S-Cal).
[2] Use of Relative to facilitate indicated floor.
[3] The 2.4M
Ω
and 24M
Ω
ranges are functional but not specified for 4-Wire operations.
2.4 AC Voltage Measurements
Input Characteristics
Input Resistance
1 M
, shunted by < 300 pF
Max. Crest Factor
4 at Full Scale, increasing to 7 at Lowest Specified Voltage
AC coupled
Specified range: 10 Hz to 200 kHz
Typical Settling time
< 0.5 sec to within 0.1% of final value
Common Mode rejection:
at 50Hz to 60Hz, 1 k
imbalance in either lead, is better than 60 dB.
