Operator`s manual

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 reading + 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 reading + ) [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 reading + ) [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 2.4MΩ and 24MΩ 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.