ADC-20 PICO TECHNOLOGY, ADC-20 Datasheet - Page 13

• Manufacturer Part Number: ADC-20
• Description: DATALOGGER, HI-RES
• Manufacturer: PICO TECHNOLOGY

Specifications of ADC-20

• Connector Type: D25 Female
• Interface: USB 1.1 (USB 2.0 Compatible)
• No. Of Channels: 8
• Power Supply: From USB
• Resolution: 20 Bits
• Interface Type: USB 1.1 (USB 2.0 Compatible)
• Rohs Compliant: NA
• Lead Free Status / RoHS Status: na

ADC-20/ADC-24 User's Guide
4.1
4.2
4
Copyright © 2005-2010 Pico Technology Ltd. All rights reserved.
About the unit
The ADC-20 and ADC-24 High-Resolution Data Loggers offer the ultimate in precise
and accurate readings. Features such as true differential inputs, galvanic isolation
and software-selectable sample rates all contribute to a superior noise-free resolution.
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
USB 1.1 or USB 2.0 port. Using the supplied PicoLog software, you can record,
monitor and analyse collected data, even exporting to third-party applications such as
Microsoft Excel.
Introduction
Specifications
Input channels
Conversion time per channel
Input voltage ranges
Resolution
Noise-free resolution
Overvoltage protection
Common-mode range
Common-mode rejection ratio
Noise rejection
Input impedance
Gain error from source
impedance
Gain error
Offset error
Digital I/O
The ADC-20 is equipped with a 20-bit A/D converter, and can maintain a gain error of
Differential
Single-ended
Channel to common
Channel to common
Common to earth ground
Channel to common
Common to earth ground
Output level, high
Output level, low
Input level, high
Input level, low
±1250 mV and ±2500 mV
Configurable up to 4
Configurable up to 8
60 ms, 100 ms, 180 ms, 340 ms, 660 ms
±30 V between any input and common
±1.9 V (±39 mV to ±1250 mV ranges)
0.5 ppm per ohm source impedance
2 ranges
ADC-20
20 bits
120 dB typical at 50 to 60 Hz
0.2%
None
400 µV (±2500 mV range)
±3.0 V (±2500 mV range)
36 µV (±1250 mV range)
>125 dB (d.c. to 60 Hz)
13 µV (±313 mV range)
20 µV (±625 mV range)
due to input impedance
9 µV (±156 mV range)
6 µV (±39 mV range)
7 µV (±78 mV range)
95 dB (d.c. to 60 Hz)
1 MΩ (single-ended)
2 MΩ (differential)
See
table
±30 V
below
±39 mV to ±2500 mV
Configurable up to 16
(0.2% at ±2500 mV)
Configurable up to 8
7 ranges
> 2.40 V
< 0.40 V
> 2.20 V
< 0.88 V
ADC-24
24 bits
0.1%
4
adc20.en
10