NF DM2571, Руководство пользователя, Страница: 349 / 369

APPENDIX
345
Measuring Characteristics
DC Voltage Input Resistance Range
100 mV
10 M
Ω
or >10 G
Ω
Selectable
1 V
10 V
100 V
10 MΩ±1%
1000 V
Input Bias
30 pA (Typ, 25°C)
Input Protection
1000 V on all ranges
Measurement Method: Sigma-delta A/D Converter
Resistance Max. Lead
Resistance
10% of range per lead for 100
Ω
, 1 k
Ω
ranges. 1 k
Ω
per lead on all other ranges.
Input Protection
1000 V on all ranges
Measurement Method: Selectable 4-wire or 2-wire ohms. Current source referenced to Input LO
Terminal
DC Current
Range
Shunt Burden Voltage
100 μA 100
Ω
<0.011 V
1 mA 100
Ω
<0.11 V
10 mA 1
Ω
<0.04 V
100 mA 1
Ω
<0.4 V
1 A 0.1
Ω
<0.7 V
3 A 0.1
Ω
<2 V
10 A 10m
Ω
<0.5 V
Input Protection
External 3.15 A, 500 V fuse for 3 A
Internal 6 A, 1 kV fuse for 3 A
Internal 12 A, 1 kV fuse for 10 A
Reading Rate
(Readings/sec)
Speed Digits
DCV
DCI
2W/4W-Resistance
5/s
，
20/s
，
60(50)/s
，
100/s 6 ½
400/s
，
1.2k/s
，
2.4k/s
5 ½
4.8k/s
，
7.2k/s
，
10k/s
4 ¼
Speed Digits
Continuity
Diode
60(50) /s 6 ½
100 /s 5 ½
400 /s 4 ¼
[1]. DC Specification: In addition to the availability that requires
warm-up of 60 minutes, it must be set in 5/s speed rate (60(50)/s speed
rate for Continuity and Diode), A-Zero on.
[2]. The entire range of measurement will pass the set range by 20%
except the tests of 1000 V DC, 3 A DC, 10 A DC and diode.
[3]. This specification applies to 4-wire resistance measurement, whilst it
requires using "REL" function for offset on 2-wire resistance
measurement. 2-wire resistance measurement will cause additional error