Data Acquisition Products Selection Guide

	Hydra Series			NetDAQ Series
Measurement	2620A	2625A/2625A/WL	2635A	2640A	2645A
Thermocouples	9 Types	9 Types	9 Types	9 types	9 types
RTDs	100 Ohm Pt. 385	100 Ohm Pt. 385	100Ohm Pt. 385	100Ohm Pt. 385	100Ohm Pt. 385
Resistance	To 10 MOhm	To 10 MOhm	To 10 MOhm	To 3 MOhm	To 3 MOhm
DC Voltage Ranges	100 mV-150V2, 300V1	100 mV-150V2, 300V1	100 mV-150V2, 300V1	90 mV-150/ 300V4	90 mV-50V
Max DC Resolution	1 µV	1 µV	1 µV	1 µV	10 µV
AC Voltage Ranges	300 mV-150V, 300V1	300 mV-150V, 300V1	300 mV-150V, 300V1	300 mV-150/300V4	300 mV-30V
DC Current5	4 to 20 mA	4 to 20 mA	4 to 20 mA	4-20 mA	4-20 mA
Status (Contacts)	Yes	Yes	Yes	Yes	Yes
Counter	To 1 MHz	To 1 MHz	To 1 MHz	To 1 MHz	To 1 MHz
Event Totalize	Yes	Yes	Yes	Yes	Yes
Outputs
Status or Alarms (# of chs)	12	12	12	8	8
Features
Analog Input Channels (maximum)	21	21/400	21	400	400
Basic Accuracy (V dc)	0.01%	0.01%	0.01%	0.01%	0.02%
Speed Channels/second	4/17	4/17	4/17	6/40/100	45/200/1000
Instrument Set-up and Operation	Front Panel or Computer I/F	Front Panel or Computer I/F	Front Panel or Computer I/F	Computer I/F	Computer I/F
RS-232C/IEEE-488/Ethernet	Std/Opt/NA	Std/NA/NA	Std/NA/NA	NA/NA/Std	NA/NA/Std
12V dc Operation	Yes	Yes	Yes	Yes	Yes
Graphics	Via Host	Via Host	Via Host	Via Host	Via Host
Permanent Data Storage	Host	NV RAM	PC Card	Host	Host
Battery Back-up	Program, Clock, Data	Program, Clock, Data	Program, Clock, Data	Program, Clock	Program, Clock
PC Application Software	Yes	Yes	Yes	Yes	Yes

1) 300V from front panel and channels 1 and 11

2) 100 mV range available for thermocouple measurements and dc volts measurements when under computer control. 300 mV range is minimum front panel selectable range.

3) 400 channels 2625A/WL only

4) 300V channels 1 and 2

5) With 2620A-101, 10 Ohm Shunt set