A-8 Specifications
Ohms (cont’d)
2-Wire Resistance Reading Rates
10,12
Readings/Second with
Measurement Default Readings/Second to Memory Readings/Second to IEEE-488
16
Time Stamp to IEEE-488
16
PLC Aperture Bits Digits Autozero Off Autozero On Autozero Off Autozero On Autozero Off Autozero On
10 167 ms (200 ms) 29 8½ 6 ( 5 ) 2 (1.7) 6 (5) 2 (1.6) 6 (5) 2 (1.6)
2 33.4 ms (40 ms) 27 7½ 29 (25) 9 (7.6) 29 (24) 9 (7.4) 27 (22) 9 (7.4)
1 16.7 ms (20 ms) 26 7½ 56 (48) 47 (40) 55 (45) 46 (38) 50 (41) 42 (34)
0.2
11
3.34 ms (4 ms) 23 6½ 222 (197) 156 (139) 220 (196) 148 (132) 156 (139) 107 (95)
0.1
11
1.67 ms (2 ms) 22 6½ 330 (317) 176 (169) 305 (293) 166 (159) 157 (151) 110 (106)
0.02
11
334 µs (400 µs) 20 5½ 330 (330) 182 (182) 305 (305) 172 (172) 160 (160) 113 (113)
0.01
11
167 µs (167 µs) 19 4½ 384 (384) 186 (186) 352 (352) 172 (172) 179 (179) 123 (123)
0.01
8,11
167 µs (167 µs) 19 4½ 2000 (2000) 2000(2000)
4-Wire Resistance Reading Rates
10,12
Readings or Readings with Time Stamp/Second to Memory or IEEE-488
16
Measurement Default Autozero Off Autozero Off Autozero On Autozero On
PLC Aperture Bits Digits Offset Comp. Off Offset Comp. On Offset Comp. Off Offset Comp. On
10 167 ms (200 ms) 29 8½ 6 ( 5 ) 3 (2.5) 2 (1.6) 1 (0.8)
2 33.4 ms (40 ms) 27 7½ 27 (22) 13 (10.7) 9 (7.4) 4 (3.5)
1 16.7 ms (20 ms) 26 7½ 50 (41) 25 (20) 42 (34) 20 (16)
0.2
11
3.34 ms (4 ms) 23 6½ 154 (137) 76 (68) 115 (102) 54 (48)
0.1
11
1.67 ms (2 ms) 22 6½ 184 (176) 92 (88) 123 (118) 63 (60)
0.02
11
334 µs (400 µs) 20 5½ 186 (186) 107 (107) 126 (126) 72 (72)
0.01
11
167 µs (167 µs) 19 4½ 211 (211) 107 (107) 133 (133) 72 (72)
Ohms Notes
1 Current source has an absolute accuracy of ± 5%.
2 Refers to source lead resistance. Sense lead resistance is
limited only by noise considerations. For best results, it is
suggested that it be limited to 1.5kΩ.
3 Offset compensation voltage plus source current times
measured resistance must be less than source current
times resistance range selected.
4 For 2-wire mode.
5 Specifications are for 10 power line cycles, 10-reading
repeat digital filter, synchronous autozero, autorange off,
4-wire mode, offset compensation on (for 20Ω to 20kΩ
ranges), except as noted.
6 For T
CAL ±1°C, following 4-hour warm-up. TCAL is ambient
temperature at calibration (23°C at the factory).
7 For T
CAL ±5°C, following 4-hour warm-up.
8 In burst mode, display off. Burst mode requires autozero
refresh (by changing resolution or measurement function)
once every 24 hours.
9 For T
CAL ±5°C, normal autozero. 1-year and 2-year accuracy
can be found by applying the same speed accuracy ppm
changes to the 1-year or 2-year base accuracy.
10 For on-scale readings, no trigger delays, digital filter off,
internal trigger, normal autozero, display off, SREAL
format. These rates are for 60Hz and (50Hz). Rates for
400Hz equal those for 50Hz.
11 Ohms measurements at rates lower than 1 power line
cycle are subject to potential noise pickup. Care must be
taken to provide adequate shielding.
12 Typical values. Peak-to-peak noise equals 6 times rms
noise.
13 Current source is paralleled with a 10MΩ resistance.
14 Specifications apply for 20-reading repeat digital filter,
T
REF ± 0.5°C (TREF is the initial ambient temperature), and
for measurements within 10% of the initial measurement
value and within 10 minutes of the initial measurement
time.
15 Specifications are for 1 power line cycle, normal autozero,
digital filter off, autorange off, 4-wire mode, offset
compensation off, except as noted.
16 Using Internal Buffer.
DC Amps
DCI Input Characteristics and Accuracy
Maximum Relative Accuracy
1
Temperature Coefficient
1
Full Burden ±(ppm of reading + ppm of range) ±(ppm of reading + ppm of range)/°C
Range Scale Resolution Voltage
6
24 Hours
2
90 Days
3
1 Year
3
2 Years
3
Outside TCAL ±5°C
200 µA 210.00000 10 pA 0.25 V 50 + 6 275 + 25 350 + 25 500 + 25 50 + 5
2 mA 2.1000000 100 pA 0.3 V 50 + 5 275 + 20 350 + 20 500 + 20 50 + 5
20 mA 21.000000 1 nA 0.35 V 50 + 5 275 + 20 350 + 20 500 + 20 50 + 5
200 mA 210.00000 10 nA 0.35 V 75 + 5 300 + 20 375 + 20 525 + 20 50 + 5
2 A 2.1000000 100 nA 1.1 V 350 + 5 600 + 20 750 + 20 1000 + 20 50 + 5
DC Current Uncertainty = ± [ (ppm reading) × (measured value) + (ppm of range) × (range used) ] / 1,000,000.
% Accuracy = (ppm accuracy) / 10,000.
5ppm of Range = 10 counts at 6½ digits.
Settling Characteristics Pre-programmed settling delay times are for <500pF external circuit capacitance. Reading
settling times are affected by source impedance and cable dielectric absorption characteristics.
Ohms Voltage Drop
Measurement Available as a multiple display.
Autoranging Autoranges up at 105% of range, down at 10% of range.
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