ADC-20 and ADC-24 data loggers

Inputs and outputs

ADC-20

ADC-24

Resolution

20 bits

24 bits

Number of channels

4 differential / 8 single-ended

8 differential / 16 single-ended

Each differential channel can optionally be configured as two single-ended channels.

Conversion time per channel

660 ms, 340 ms, 180 ms, 100 ms, 60 ms

Voltage ranges

±2500 mV

±1250 mV

±2500 mV

±1250 mV

±625 mV

±312 mV

±156 mV

±78 mV

±39 mV

Gain error

0.2% of reading

0.2% (±2500 mV range)

0.1% (±39 mV to ±1250 mV ranges)

Offset accuracy

400 µV (±2500 mV range)

36 µV (±1250 mV range)

400 µV (±2500 mV range)

36 µV (±1250 mV range)

20 µV (±625 mV range)

13 µV (±313 mV range)

9 µV (±156 mV range)

7 µV (±78 mV range)

6 µV (±39 mV range)

Offsets typical with input source impedance ≤ 1 kΩ

Noise-free resolution

Conversion

time per

channel

Voltage range

ADC-24 only

ADC-20 and ADC-24

±39 mV

±78 mV

±156 mV

±313 mV

±625 mV

±1250 mV

±2500 mV

Noise-free resolution (bits)

660 ms

17

18

19

20

20

20

20

340 ms

17

18

19

19

19

20

20

180 ms

16

17

18

19

19

19

19

100 ms

16

17

18

18

18

19

19

60 ms

15

16

17

18

18

18

18

Noise rejection

120 dB typical at 50/60 Hz

Input impedance

Differential:

2 MΩ

Single-ended: 1 MΩ

ADC input bias current

50 nA max.

Common mode input range, channel to common

±3.0 V (±2500 mV range)

±1.9 V (±39 mV to ±1250 mV ranges)

Common mode input range, common to earth ground

±30 V

Specifications