A- 4 Specifications
Resist ance Measurement Accuracy (4 wire remote sense)
Source I Mode, Auto Ohms
Max. Default Normal Accuracy (23°C ± 5°C) Enhanced Accuracy (23°C ± 5°C)
5
Range Resolution Test Current 1 Y ear, ±(%rdg + ohms) 1 Year, ±(%rdg + ohms)
<0.20000 ž
4
1 ž — Source I ACC + Measure VACC Measure IACC + Measure VACC
2.00000 ž 10 ž 1 A 0.169% + 0.0003 ž 0.129% + 0.0001 ž
20.0000 ž 100 ž 100 m A 0.098% + 0.003 ž 0.073% + 0.001 ž
200.000 ž 1 m ž 10 m A 0.077% + 0.03 ž 0.053% + 0.01 ž
2.00000 kž 10 m ž 1 m A 0.066% + 0.3 ž 0.045% + 0.1 ž
20.0000 kž 100 m ž 100 A 0.063% + 3 ž 0.043% + 1 ž
200.000 kž 1 ž 10 A 0.065% + 30 ž 0.046% + 10 ž
2.00000 M ž 10 ž 10 A 0.068% + 100 ž 0.049% + 50 ž
20.0000 M ž 100 ž 1 A 0.249% + 1 kž 0.112% + 500 ž
>20.0000 M ž
4
1 kž — Source I
ACC + Measure VACC Measure I ACC + Measure VACC
TEMPERATURE COEFFICIENT (0°–18°C & 28°–50°C): ±(0.15 ∞ accuracy specification)/ °C.
SOURCE I MODE, MANUAL OHMS: Tot al uncert ainty = I source accuracy + V measure accuracy (4-wire remote sense).
SOURCE V MODE: Tot al uncert ainty = V source accuracy + I measure accuracy (4-wire remote sense).
6-WIRE OHMS MODE: Available using active ohms guard and guard sense. Max. Guard Output Current: 50 mA (except 1A and 3A
ranges). Accuracy is load dependent. Refer to manual for calculation formula.
GUARD OUTPUT IMPEDANCE: 0.1ž in ohms mode.
1
S peed = Normal (1 PLC). For 0.1 PLC, add 0.005% of range to offset specifications, except 200mV, 1A ranges, add 0.05%; 3A/10A range, add 1.5mA. For
0.01 PLC, add 0.05% of range to offset specifications, except 200mV, 1A ranges, add 0.5%; 3A/10A range, add 15mA.
2
Accuracies apply to 2- or 4-wire mode when properly zeroed.
3
4-wire mode.
4
Manual ohms mode only.
5
Source readback enabled, offset compensation ON.
6
1 0 A range only in pulse mode.
7
In pulse mode, limited to 0.1 PLC measurement.
System Speeds
Measurement
1
MAXIMUM RANGE CHANGE RATE: 65/second.
MAXIMUM MEASURE AUTORANGE TIME: 40ms (fixed source)
2
.
SWEEP OPERATION
3
READING RATES (rdg/second) FOR 60Hz (50Hz):
Source-Measure
NPLC/Trigger Measure Source-Measure Pass/Fail Tes t
4
Source-Memory
4
Speed Origin To Mem. To GPIB To Mem. To GPIB To Mem. To GPIB To Mem. To GPIB
Fast 0.01 / internal 2080 (2030) 1210 (1210) 1550(1515) 1010 (1010) 930 (900) 840 (840) 163 (162) 163 (162)
0.01 / external 1250 (1200) 1090 (1050) 1030 (990) 920 (920) 860 (830) 780 (780) 161 (160) 161 (160)
Medium 0.10 / internal 5 0 5 (433) 505 (433) 465 (405) 465 (405) 390 (343) 390 (343) 132 (126) 132 (126)
0.10 / external 43 5 (380) 435 (380) 405 (360) 405 (360) 375 (333) 375 (333) 130 (125) 130 (125)
Normal 1.00 / internal 59 (49) 59 (49) 58 (48) 58 (48) 57 (47) 57 (47) 4 4 (38) 44 (38)
1.00 / external 57 (48) 57 (48) 57 (48) 5 7 (48) 56 (47) 5 6 (47) 4 4 (38) 44 (38)
SINGLE READING OPERATION READING RATES (rdg/second) FOR 60Hz (50Hz):
Measure Source-Measure
5
Source-Measure Pass/Fail Test
4, 5
Speed NPLC/Trigger Origin To GPIB To GPIB To GPIB
Fast 0.01 / internal 2 5 6 (256) 83 (83) 83 (83)
Medium 0.10 / internal 1 8 1 (166) 73 (70) 73 (70)
Normal 1.00 / internal 49 (42) 35 (31) 34 (30)
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