ADC-20 and ADC-24

Precision Data Loggers

Multichannel data loggers offering high resolution, high accuracy and programmable input ranges.

ADC-20 & ADC-24 Specifications

  ADC-20 ADC-24
Resolution 20 bits 24 bits
Number of channels[1] 4 differential / 8 single-ended 8 differential / 16 single-ended
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 0.1% (±39 mV to 1250 mV range)
0.2% (±2500 mV range)
Offset accuracy 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)
36 µV (±1250 mV range)
400 µV (±2500 mV range)

[1]The ADC-20 and ADC-24 have four and eight true differential input channels respectively. For flexibility each of these channels can be configured as either one differential channel or two single-ended channels.

Noise-free resolution and conversion time
Conversion time per channel Voltage ranges & noise-free resolution (bits) for the full range of conversion times
  ±39 mV ±78 mV ±156 mV ±313 mV ±625 mV ±1250 mV ±2500 mV
  ADC-24 only ADC-20 and ADC-24
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
  ADC-20 ADC-24
Noise rejection 120 dB typical at 50/60 Hz
Input impedance Differential: 2 MΩ
Single-ended: 1 MΩ
Common mode input range, channel to common ±1.9 V (±39 mV to ±1250 mV ranges)
±3.0 V (±2500 mV range)
Common mode input range, common to earth ground ±30 V
Common mode rejection ratio, channel to common 95 dB (DC to 60 Hz)
Common mode rejection ratio, common to earth ground > 125 dB (DC to 60 Hz)
Overvoltage protection ±30 V between any input and common
Digital I/O none 4 bidirectional (3.3 V CMOS)
Output level, high: > 2.40 V
Output level, low: < 0.40 V
Input level, high: > 2.20 V
Input level, low: < 0.88 V
Isolation (input to input) None
Isolation (input to ground) Galvanic up to ±30 V
AGND and DGND isolated
Reference output +2.5 V ±2.5 mV @ 2 mA
+5 V ±1.0 V @ 2 mA
–5 V ±1.5 V @ 2 mA
Software
PicoLog and PicoSDK Available from www.picotech.com/downloads
Example code Available from Pico's GitHub organization page, github.com/picotech
PicoLog user interface languages English, French, Italian, German, Spanish, Korean, Japanese, Chinese (simplified), Russian
PC requirements
PicoLog Microsoft Windows 7, 8 or 10, 32-bit and 64-bit versions, macOS 10.9 (Mavericks) or later, 64-bit only, Linux*, 64-bit only Hardware requirements as operating system.
*PicoLog for Linux is distributed as an AppImage, so you can install it without superuser permissions: see appimage.org for further information. The software has been tested on OpenSUSE and Ubuntu.
PicoSDK[2] Only available for Windows. Drivers also available for 64-bit Linux and macOS.
PC interface USB 1.1 (USB 2.0 and 3.1 compatible)

[2]PicoSDK 10.6.11 are the last versions compatible with Microsoft Windows XP (SP3) and Vista SP2, and they are also compatible with the Windows versions above.

Environmental
Temperature range, operating, for quoted accuracy 20 °C to 30 °C
Temperature range, operating 0 °C to 45 °C
Temperature range, storage –20 to +60 °C
Humidity range, operating 5 to 80 %RH, non-condensing
Humidity range, storage 5 to 95 %RH, non-condensing
General
I/O connector 25-way D female
Power requirements Powered from USB port, 100 mA (max.)
A 4.4 m (13.8 ft) USB cable is permanently attached to the logger
Dimensions 135 x 184 x 36 mm (5.31 x 7.24 x 1.41 in)
Weight Approx. 505 g (17.8 oz)
Compliance European EMC and LVD standards
FCC Rules Part 15 Class A
Warranty 5 years