Atec Fluke-2638A - Manual (Page 7)

7 Fluke Corporation Fluke 2638A Hydra Series III Data Acquisition System/Digital Multimeter
Measurement specifications
Accuracy specifications generally are valid for 6.5 digit
resolution mode (unless otherwise noted) after a mini-
mum of one-hour warm-up, and within an operating
temperature range of 18 °C to 28 °C. Derating applies
with a fast sample rate and for operating tempera-
tures outside the limited range. Twenty-four-hour
specifications are relative to calibration standards and
assume a controlled electromagnetic environment per
EN 61326. The confidence level for accuracy specifica-
tions is 95 % within one year of calibration (unless
otherwise noted).
Scan rate Fast 45 channels per second max (0.03 seconds per channel, depending on function and range)
Medium 16 channels per second (0.1 seconds per channel)
Slow 2 channels per second (0.5 seconds per channel)
Custom Selectable from 0.2 NPLC to 200 NPLC
Display resolution 4.5 to 6.5 digits, depending on function and sample rate
Specifications
DC voltage
Maximum input 300 V
Common mode rejection 140 db at 50 Hz or 60 Hz ±0.1 % (1k Ω imbalance)
Normal mode rejection 60 db for NPLC of 1 or greater and power-line frequency ±0.1 %
Measurement method Multi-ramp A/D
A/D linearity 2 ppm of measurement + 1 ppm of range
Input bias current 30 pA at 25 °C
DC voltage input characteristics
Range Resolution Measurement rate/Resolution Input impedance
Fast
4.5 digits
Medium
5.5 digits
Slow
6.5 digits
100 mV 100.0000 mV 10 µV 1 µV 0.1 µV 10 MΩ or >10 GΩ [1]
1 V 1.000000 V 100 µV 10 µV 1 µV 10 MΩ or >10 GΩ [1]
10 V 10.00000 V 1 mV 100 µV 10 µV 10 MΩ or >10 GΩ [1]
100 V 100.0000 V 10 mV 1 mV 100 µV 10 MΩ ±1%
300 V 300.000 V 100 mV 10 mV 1 mV 10 MΩ ±1%
[1] 10 MΩ is default input impedance.
DC voltage accuracy
Accuracy is given as ± (% measurement + % of range).
Range 24 hour (23 ±1 °C) 90 days (23 ±5 °C) 1 year (23 ±5 °C) T.C./ °C outside
18 °C to 28 °C
100 mV 0.0025 + 0.003 0.0025 + 0.0035 0.0037 + 0.0035 0.0005 + 0.0005
1 V 0.0018 + 0.0006 0.0018 + 0.0007 0.0025 + 0.0007 0.0005 + 0.0001
10 V 0.0013 + 0.0004 0.0018 + 0.0005 0.0024 + 0.0005 0.0005 + 0.0001
100 V 0.0018 + 0.0006 0.0027 + 0.0006 0.0038 + 0.0006 0.0005 + 0.0001
300 V 0.0018 + 0.002 0.0031 + 0.002 0.0041 + 0.002 0.0005 + 0.0003