8
ADC-20/ADC-24 User's Guide
4
About the unit
4.1
Introduction
The ADC-20 and ADC-24 High-Resolution
offer the ultimate in precise
and accurate readings. Features such as true differential inputs,
and
software-selectable sample rates all contribute to a superior
.
The ADC-20 is equipped with a 20-bit A/D converter, and can maintain a gain error of
0.2%. The four true differential inputs may be configured as eight single-ended inputs
or any combination in between, such as two differential and four single-ended. The
ADC-24 is equipped with a 24-bit A/D converter, and can maintain a gain error of
0.1%.
The eight true differential inputs may be configured as 16 single-ended inputs or any
combination in between. Power and connection to a PC or laptop is through a
1.1,
USB 2.0 or 3.0 port. Using the supplied PicoLog software, you can record, monitor and
analyze collected data, even exporting to third-party applications such as Microsoft
Excel.
4.2
Specifications
Channel to common
Channel to common
Common to earth ground
Input channels
Differential
Single-ended
Conversion time per channel
Resolution
Noise-free resolution
Overvoltage protection
±1.9 V (±39 mV to ±1250 mV ranges)
±3.0 V (±2500 mV range)
±30 V
ADC-20
Configurable up to 4
Configurable up to 8
Configurable up to 8
Configurable up to 16
60 ms, 100 ms, 180 ms, 340 ms, 660 ms
2 ranges
±1250 mV and ±2500 mV
7 ranges
±39 mV to ±2500 mV
20 bits
24 bits
See
below
±30 V between any input and common
Channel to common
Common to earth ground
Noise rejection
Input impedance
Gain error from source
mpedance
95 dB (DC to 60 Hz)
>125 dB (DC to 60 Hz)
120 dB typical at 50 to 60 Hz
2 MΩ (differential), 1 MΩ (single-ended)
0.5 ppm per ohm source impedance
due to input impedance
0.2%
0.1%
(0.2% at ±2500 mV)
Offset error
36 µV (±1250 mV range)
400 µV (±2500 mV range)
6 µV (±39 mV range)
7 µV (±78 mV range)
9 µV (±156 mV range)
13 µV (±313 mV range)
20 µV (±625 mV range)
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adc20.en r6
