Fluke 2635A, 2625A, 2620A User Manual

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HYDRA

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DATA ACQUISITION UNIT

Data Acquisition

Detailed Specifications

2680A Series - NetDAQ® - Hydra Series

Models 2620A, 2620A/05, 2625A, 2635A

This document provides detailed
specifications for the Fluke
2680A Series, Hydra Series and
NetDAQ data acquisition products.
This is a supplement to the Fluke
Data Acquisition Tools brochure
(1267610). If you wish to
obtain a copy of this product
brochure you may call: in the
U.S.A., (800) 44-FLUKE; Canada,
[phone]; Europe, +31
(0) 40 2 678 200; other countries,
[phone], or contact your
local representative.

Hydra Series

Hydra Series

Channel capacity

Analog inputs: 21
Digital I/0 and alarm outputs:

12 total
Totalizer: 1

Power

90 to 264 Vac, 50 or 60 Hz
(<10W), or 9 to 16 Vdc (<4W)
(If both sources are applied
simultaneously, the greater of
ac or dc is used.) At 120 VAC the
equivalent DC voltage ~14.5V.

Temperature, humidity
(non-condensing)

Operating: 0°C to 28°C, ≤ 90%
RH;

28°C to 40°C,≤ 75% RH;
40°C to 60°C, ≤ 50% RH
Storage: -40°C to 75°C, 5% to
95% RH

Altitude

Operating: 2000 m
Storage: 12000 m

Voltage ratings

300 Vdc or Vac rms (channels
0,1,11); 150 Vdc or Vac rms (all
other inputs) IEC Overvoltage
Category II

Common mode voltage

300V dc or ac rms maximum
from any analog input (channel)
to earth provided that channel
to channel maximum voltage
ratings are observed

Standards

IEC1010, ANSI/ISA-S82.01-1994,
CSA-C22.2 No. 1010.1-92, and
EN61010-1:1993. Complies with
EN 50081-1, EN 50082-1, Vfg.
243/1991 and FCC-15B at the
Class B level, when shielded
cables are used.

Size

9.3 cm H x 21.6 cm

W x

31.2 cm D

Weight

3.0 kg

Interfaces

RS-232

connector: Nine pin male

(DB-9P)

signals: TX, RX, DTR, GND,

CTS,* DSR,* RTS*
modem
control: Full duplex
baud rate: 300, 600, 1200,

2400, 4800,

9600, 19.2k*,

38.4k*

data format: 8 data bits, no

parity, one stop

bit; or 7 data bits,

one parity bit, one

stop bit
parity: Odd, even, none
echo: On/Off
flow control: XON/XOFF, CTS*

* 2635A only

IEEE-488 (Optional, 2620A only)

Disables RS-232 interface while
in use.

Memory life

10 years minimum for real time
clock, setup configuration and
measurement data (from date of
manufacture)

2635A memory card

Type: SRAM type only; PCMCIA
compliant
Capacity: The chart below shows
Memory Card storage capacity in
scans for one data file. One scan
comprises date and time, read­ings from all defined analog input
channels, the status of the four
alarm outputs and eight digital
I/O, and the totalizer count.

Number of scans per card

Memory Channels in scan
Card size 4 10 20

256 kb 8900 4800 2710

512 kb 18250 9840 5560

1 Mb 36860 19860 11210

2 Mb 74110 39910 22550

4 Mb 149039 80251 45359

2625A data memory

Stores 2,047 scans

•

Stored with each scan: time

•

stamp, all defined analog input
channels, the staus of four
alarm outputs and eight digital
I/O, and the totalizer count

Memory life: 5 years minimum;

•

at 25°C

RTD (Pt 100)

Temp.
(°C) Slow Fast Slow Fast

-200°C 0.02 0.1 0.05 0.47
0°C 0.02 0.1 0.09 0.55
100°C 0.02 0.1 0.10 0.58
300°C 0.02 0.1 0.14 0.65
600°C 0.02 0.1 0.20 0.76

Range Slow Fast

15-900 Hz 0.01 Hz 0.1 Hz 0.05 + 2
9 kHz 0.1 Hz 1.0 Hz 0.05 + 1
90 kHz 1 Hz 10 Hz 0.05 + 1
900 kHz 10 Hz 100 Hz 0.05 + 1
1 MHz 100 Hz 1 kHz 0.05 + 1

15 Hz-100 kHz 100 mV rms sine wave

100 kHz-300 kHz 150 mV rms sine wave

300 kHz-1 MHz 2V rms sine wave

Above 1 MHz not specified

Resolution

Frequency

Resolution

Sensitivity

Frequency Level

Accuracy

1,3

±°C

(4-Wire)

Accuracy

(Slow/Fast)

± (%+counts)

Measurement accuracy

1,4

, 3

σσ

σ, ±(%+V)

σσ

1,3

±(%+Ω)

1,2

σσ

σ, (± °C)

σσ

±(%+counts)

DC Voltage Accuracy1, 3

Range

90 mV* 1 µV10 µV.019% + 6 µV .024% + 6 µV .044% + 20 µV
300 mV 10 µV100 µV.018% + 20 µV .023% + 20 µV .040% + 0.2 mV

3V 100 µV1 mV .019% + 0.2 mV .024% + 0.2 mV .041% + 2 mV

30V 1 mV 10 mV .019% + 2 mV .024% + 2 mV .041% + 20 mV

300/150V 10 mV 100 mV .019% + 20 mV .024% + 20 mV .041% + 0.2V

Resistance Accuracy (4-wire)

300Ω 10 mΩ 100 mΩ 0.013% + 20 mΩ 0.014% + 20 mΩ 0.014% + 200 mΩ

3 kΩ 100 mΩ 1Ω 0.015% + 0.2Ω 0.016% + 0.2Ω 0.016% + 2Ω

30 kΩ 1Ω 10 Ω 0.013% + 2Ω 0.014% + 2Ω 0.014% + 20Ω

300 kΩ 10Ω 10 0Ω 0.020% + 20Ω 0.021% + 20Ω 0.021% + 0.2 kΩ

3 MΩ 10 0Ω 1 kΩ 0.059% + 0.2 kΩ 0.063% + 0.2 kΩ 0.063% + 2 kΩ

10 MΩ 1 kΩ 10 kΩ 0.168% + 2 kΩ 0.169% + 2 kΩ 0.709% + 20 kΩ

AC Voltage (True rms, ac coupled) Frequency Accuracy

300 mV 10 µV100 µV 50 Hz-150 Hz 0.3% + 15 0.3% + 4

3V 100 µV1 mV 150 Hz-10 kHz 0.16% + 15 0.16% + 4

30V 1 mV 10 mV 10 kHz-20 kHz 0.37% + 15 0.37% + 4

300/150V 10 mV 100 mV 20 kHz-50 kHz 1.9% + 20 1.9% + 4

Thermocouples

2635A ITS90 18 to 28°C0 to 60°C

Type Temp. (°C)

J -30°C to 150°C 0.37 0.39 0.80 0.57 1.02

K -25°C to 120°C 0.43 0.44 0.93 0.62 1.16

N -25°C to 120°C 0.53 0.55 1.22 0.67 1.39

E -25°C to 350°C 0.38 0.39 0.77 0.61 0.98

T0°C to 120°C 0.45 0.46 0.95 0.59 1.13

R 400°C to 1000°C 0.79 0.81 2.30 1.15 2.53

S1000°C to 1400°C 0.83 0.89 2.34 1.47 2.94

B1200°C to 1550°C 0.74 0.77 2.25 1.18 2.57

C 650°C to 1000°C 0.70 0.76 1.81 1.29 2.38

*2635A only
Note: The terms “slow” and “fast” in these tables refer to the minimum and maximum measurement
speed (Rdgs/s) as listed in the specifications for a specific model.

Resolution Slow Fast

Slow Fast 90 days 1 year 1 year

20 Hz-50 Hz 1.43% + 15 1.43% + 4

50 kHz-100 kHz 5.0% + 50 5.0% + 10

5

90 days 1 year 1 year 1 year 1 year

slow slow fast slow fast

-100°C to -30°C 0.42 0.43 0.91 0.55 1.08

150°C to 760°C 0.44 0.48 0.94 0.88 1.38

-100°C to -25°C 0.52 0.53 1.13 0.65 1.31

120°C to 1000°C 0.61 0.68 1.38 1.28 2.03

1000°C to 1372°C 0.89 0.98 1.87 1.85 2.79

-100°C to -25°C 0.62 0.63 1.44 0.75 1.61

120°C to 410°C 0.47 0.49 1.08 0.69 1.28

410°C to 1300°C 0.70 0.78 1.52 1.45 2.23

-100°C to -25°C 0.44 0.46 0.91 0.57 1.09

350°C to 650°C 0.39 0.43 0.82 0.80 1.23

650°C to 1000°C 0.50 0.56 1.05 1.11 1.63

-150°C to 0°C 0.68 0.69 1.50 0.82 1.71

120°C to 400°C 0.36 0.39 0.78 0.61 1.02
250°C to 400°C 0.83 0.85 2.47 1.02 2.66

1000°C to 1767°C 0.96 1.05 2.59 1.85 3.42

250°C to 1000°C 0.88 0.89 2.60 1.26 2.80

1400°C to 1767°C1.07 1.17 2.96 2.03 3.84

600°C to 1200°C1.111.12 3.53 1.27 3.69

1550°C to 1820°C 0.82 0.89 2.35 1.43 2.90

0°C to 150°C 0.72 0.73 1.90 0.86 2.08

150°C to 650°C 0.62 0.64 1.62 0.99 1.94

1000°C to 1800°C1.121.25 2.86 2.38 4.04

18 00°C to 2316°C1.86 2.08 4.61 4.06 6.66

Accuracy

2 Fluke Corporation Data Acquisition Full Line Specifications

Measurement accuracy cont.

Thermocouples

B1200 to 1550 0.74 0.77 2.25 1.18 2.57

C 650 to 1000 0.70 0.76 1.81 1.29 2.38

1000 to 1800 1.12 1.25 2.86 2.38 4.04

1

Total instrument accuracy for 1 year following calibration (unless otherwise stated). Ambient
operating temperature 18°-28°C (unless otherwise stated). Includes A/D errors, linearization
conformity, initial calibration error, isothermality errors, and reference junction conformity.
(Sensor inaccuracies not included.) Relative humidity up to 90% non-condensing (except up
to 70% for the 300 kΩ, 3 MΩ, and 10 MΩ ranges).

2

Sine wave inputs >2000 counts (slow), >200 counts (fast). Accuracies for crest factor ≤2.0.

3

DIN/IEC 751 only, 4-wire configurations.

4

Resolution is 0.1°C or 0.1°F over the useful range of base metal thermocouples (J, K, T, E, N) and

0.2° resolution for types R, S, B, and C, with slow scan. Fast scan resolution =1°C or F.

5

Open thermocouple detection is performed on each thermocouple channel unless defeated by
computer command. IPTS 68 specifications are published in the user manual.

5

600 to 1200 1.11 1.12 3.53 1.27 3.69

1550 to 1820 0.82 0.89 2.35 1.43 2.90

0 to 150 0.72 0.73 1.90 0.86 2.08

150 to 650 0.62 0.64 1.62 0.99 1.94

18 00 to 2316 1.86 2.08 4.61 4.06 6.66

Accuracy

18 to 28°C0 to 60°C

1,4

σσ

, 3

σ, (± °C)

σσ

Front panel input

DCV, ACV, (300V maximum)
resistance, frequency. Use any
of the Fluke TL Series of test
leads. (One set of TL70 test
leads included with Hydra)

Common mode rejection

AC: ≥120 dB (50/60 Hz, ± 0.1%
max 1 kΩ source imbalance)
DC: ≥120 dB

Normal mode rejection

53 dB (60 Hz, ± 0.1%)
47 dB (50 Hz, ±0.1%)

Scan speed

Slow: 4 readings/second nominal
Fast: 18 readings/second nomi-

nal

(1.5

readings/sec

ond for ACV

and Ω inputs nominal)

Analog to digital converter

Dual Slope type, linear to 17 bits

Totalizing inputs

DC coupled, non-isolated,
max + 30V, min -4V

Max count: 65,535
Minimum signal: 2V peak
Threshold: 1.4V
Rate: 0-5 kHz (debounce off)
Hysteresis: 500 mV
Input debouncing: None or

1.66 ms

Digital inputs

Threshold: 1.4V
Hysteresis: 500 mV
Maximum input: +30V,

min -4V; non-isolated

Digital/Alarm outputs

The open collector output lines
are non-isolated, TTL compat­ible with the following logic
levels:

Logical “zero” output:

0.8V max | out = -1.0 mA
(1 LSTTL load equivalent)

1.8V max, | out = -20 mA

3.25V max, | out = -50 mA

Logical “one” output:

Output voltage depends on
external load

3.8V min, | out = 0.05 mA

(1 LSTTL load equivalent)

Trigger input

Minimum pulse: 5 µs
Maximum latency: 100 ms
Repeatability: 1 ms
Input “High”: 2.0V min, 7.0V max
Input “Low”: -0.6V min, 0.8V max

Non-isolated, contact closure
and TTL compatible

Clock

Accurate to within 1 minute/
month for 0°C to 50°C range

Calibration

Calibration is performed closed­case via software, eliminating
troublesome mechanical adjust­ments. This improves opera­tional reliability by avoiding the
drift caused by vibration, tem­perature, and humidity on con­ventional calibration controls.

Alarms associations

Configured
from 0123 0123 4 567

Front panel ch0 ch1 ch2 ch3 digital inputs ch4 ch5 ch6 ch7

Computer ch0 ch1 ch2 ch3

Alarm outputs Digital I/O

(Fixed) ch8 ch9 ch10 ch11

ch12 ch13 ch14 ch15

ch16/20 ch17 ch18 ch19

(Fixed) Each Digital I/O may be randomly assigned as a digital

input, status output, or alarm output (associated with any
input channel or channels), except ch 0-3

Data Acquisition Full Line Specifications Fluke Corporation 3

2640A

100, 50, 6 readings/second

•

18 bit A/D resolves 0.3 µV

•

and .02°C
300V maximum measurement

•

input
Built-in signal conditioning

•

Real time on-board clock

•

-20 to 60°C (-4 to 140°F) oper-

•

ating temperature

2645A

1000, 200, 48 readings/second

•

16 bit A/D resolves 3 µV

•

and 0.2°C
50V maximum measurement

•

input
Built-in signal conditioning

•

Real time on-board clock

•

-20 to 60°C (-4 to 140°F)

•

operating temperature

NetDAQ® Series

Models 2640A and 2645A

NetDAQ Series

Channel capacity

Analog inputs: 20
Computed channels: 10
Digital I/O and alarm outputs:

8 total
Totalizer: 1

Math functions

In addition to its 20 analog input
channels, each NetDAQ unit sup­ports 10 computed channels.
Calculations include: addition,
subtraction, multiplication, divi­sion, log, natural log, exponent,
square root, absolute value, inte­ger function, and average.

Measurement speed (2640A)

Slow: 6 readings/second nominal
Medium: 41 (50 Hz), 48 (60 Hz)

readings/sec
Fast: 143
nominal (5
VAC nominal, 140
secon
ings/sec

ond nominal

readings/sec

readings/sec

d on 300Ω range, 37

ond on 3 MΩ range)

ond

ond for

readings/

read-

Measurement speed (2645A)

Slow: 45 (50 Hz), 54 (60 Hz)
readings/sec
Medium: 200
nominal
Fast: 1000
nominal (5
VAC nominal, 370
sec

ond on 300Ω range, 44

readings/sec

Analog to digital converter

2640A: Multi-slope type, linear
to 18 bits
2645A: Multi-slope type, linear
to 16 bits

Common mode rejection

2640A:

AC: ≥120 dB (50/60 Hz, ±0.1%
max 1kΩ source imbalance)
DC: ≥120 dB

2645A:

AC: ≥100 dB (50/60 Hz, ±0.1%
max 1kΩ source imbalance)
DC: ≥100 dB

ond nominal

readings/sec

readings/sec
readings/sec

readings/

ond on 3 MΩ range)

ond

ond
ond for

Normal mode rejection

50 dB @ 50/60 Hz, ± 0.1%

Common mode voltage
maximum

2640A: 300 VDC or VAC rms
(channels 1,11); 150 VDC or
VAC rms (all other channels)
2645A: 50 VDC or 30 VAC rms
(all channels)

4 Fluke Corporation Data Acquisition Full Line Specifications

Measurement accuracy

Model 2640A

1,6

Accuracy

Thermocouples

9, 10

18 to 28°C-10 to 60°C

90 Day 1 Year 1 Year

Type Temp (°C) Slow Slow Fast Slow Fast

J-100°Cto80°C 0.45 0.5 0.8 0.6 0.8

80°Cto230°C 0.35 0.5 0.7 0.6 0.8

230°Cto760°C 0.4 0.5 0.7 0.8 0.9

K-100°Cto-25°C 0.55 0.6 0.9 0.7 1.0

-25°Cto120°C 0.4 0.5 0.8 0.6 0.9
120°Cto800°C 0.5 0.65 0.9 1.0 1.2

800°Cto1372°C 0.7 1.0 1.3 1. 6 1.9

N-100°Cto-25°C 0.65 0.75 1.2 0.8 1.3

-25°Cto120°C 0.55 0.6 1.0 0.7 1.1
120°Cto1000°C 0.45 0.6 0.9 1.0 1.2

1000°Cto1300°C 0.55 0.75 1.0 1.2 1.5

E-100°Cto-25°C 0.45 0.5 0.8 0.6 0.8

-25°Cto20°C 0.35 0.4 0.6 0.5 0.7
20°Cto600°C 0.3 0.4 0.6 0.5 0.8

600°Cto1000°C 0.4 0.5 0.7 0.9 1.0

T-100°Cto0°C 0.6 0.65 1.0 0.7 1.1

0°Cto150°C 0.4 0.5 0.8 0.6 0.9

150°Cto400°C 0.3 0.4 0.6 0.6 0.8

R 250°Cto600°C 0.9 1.0 2.1 1.2 2.2

600°Cto1500°C 0.8 0.9 1.8 1.3 2.0

1500°Cto1767°C 0.85 0.85 1.9 1.7 2.5

S 250°Cto1000°C 0.95 1.1 2.3 1.3 2.4

1000°Cto1400°C 0.8 1.0 1.9 1.4 2.3
1400°Cto1767°C1.0 1.3 2.2 1.8 2.8

B600°Cto900°C1.21.43.1 1.5 3.2

900°Cto1200°C 0.9 1.0 2.2 1.2 2.4

1200°Cto1820°C 0.75 1.0 1.9 1.3 2.2

C0°Cto150°C 0.8 0.9 1.6 1.0 1.7

150°Cto650°C 0.65 0.75 1.4 1.0 1.5

650°Cto1000°C 0.65 0.85 1.4 1.2 1.8
1000°Cto1800°C1.0 1.3 2.1 2 .1 2.8
18 00°Cto2316°C1.6 2.1 3.2 3.4 4.6

, 3

σσ

σ, ± °C

σσ

Model 2645A

1,6

, 3

σσ

σ, ± °C

σσ

Thermocouples

9, 10

Accuracy

18 to 28°C-10 to 60°C

90 Day 1 Year 1 Year

Type Temp (°C) Slow Slow Fast Slow Fast

J-100°Cto80°C 0.8 0.9 1.6 0.9 1.7

80°Cto230°C 0.7 0.8 1.4 0.9 1.5

230°Cto760°C 0.7 0.8 1.3 1.0 1.5

K-100°Cto-25°C1.01.12.0 1.2 2.1

-25°Cto120°C 0.8 0.9 1.7 1.0 1.8
120°Cto1000°C 0.9 1.1 1.8 1.5 2.2

1000°Cto1372°C1.2 1.5 2.3 2.0 2.9

N-100°Cto-25°C1.41.52.8 1.5 2.9

-25°Cto120°C1.11.32.3 1.3 2.4
120°Cto1000°C1.0 1.1 2.0 1.2 2.1

1000°Cto1300°C1.0 1.2 1.9 1.6 2.4

E-100°Cto-25°C 0.8 0.9 1.5 1.0 1.6

-25°Cto20°C 0.7 0.7 1.2 0.8 1.3
20°Cto600°C 0.6 0.7 1.1 0.8 1.2

600°Cto1000°C 0.6 0.8 1.2 1.1 1.5

T-100°Cto0°C1.11.22.2 1.3 2.3

0°Cto150°C 0.9 1.0 1.7 1. 0 1. 8

150°Cto400°C 0.7 0.8 1.4 0.8 1.5

R 250°Cto600°C 2.4 2.7 5.6 2.8 5.7

600°Cto1500°C 2.0 2.3 4.6 2.4 4.8

1500°Cto1767°C 2.0 2.3 4.5 2.8 5.1

S 250°Cto1000°C 2.6 2.8 5.9 2.9 6.0

1000°Cto1400°C 2.0 2.3 4.6 2.6 5.0
1400°Cto1767°C 2.3 2.7 5.3 3.3 5.9

B600°Cto1200°C 3.6 3.9 8.5 4.0 8.6

1200°Cto1550°C2.1 2.4 5.0 2.6 5.2
1550°Cto1820°C 2.0 2.3 4.7 2.7 5.0

C0°Cto150°C1.92.0 4.0 2.1 4.2

150°Cto650°C1.61.73.5 1.8 3.6

650°Cto1000°C1.4 1.7 3.2 2.0 3.5
1000°Cto1800°C 2.0 2.5 4.5 3.2 5.3
18 00°Cto2316°C3.1 3.8 6.8 5.1 8.1

Model 2640A

DC Voltage Accuracy1, 3

Range Resolution 90 Day 1 Year

Slow Slow Slow Fast

90 mV .3 µV 0.01%+7 µV 0.013%+8 µV 0.013%+18 µV

300 mV 1 µV 0.01%+15 µV 0.013%+17 µV 0.013%+35 µV

3V 10 µV 0.01%+.1 mV 0.013%+.15 mV 0.013%+.2 mV

30V 100 µV 0.01%+1.5 mV 0.013%+1.7 mV 0.026%+3.5 mV

150/300V 1 mV 0.01%+15 mV 0.013%+17 mV 0.052%+35 mV

Resistance Accuracy

300Ω 1 mΩ 0.015%+20 mΩ 0.02%+30 mΩ 0.02%+120 mΩ

3 kΩ 10 m Ω 0.02%+.3Ω 0.02%+.5Ω 0.02%+.1.2Ω

30 kΩ 100 mΩ 0.03%+3Ω 0.03%+5Ω 0.04%+15Ω

300 kΩ 1Ω 0.1%+40Ω 0.1%+60Ω 0.2%+150Ω

3 MΩ 10 Ω 0.25%+800Ω 0.25%+1 kΩ 0.5%+1.5 kΩ

σσ

σ, ± (%input + V) 18 to 28°C

σσ

1,3

(4-wire), 3

σσ

σ, ±(% input+Ω )

σσ

Model 2645A

DC Voltage Accuracy1, 3

Range Resolution 90 Day 1 Year

Slow Slow Slow Fast

90 mV 3 µV 0.01%+20 µV0.013%+23 µV 0.013%+50 µV

300 mV 10 µV 0.01%+40 µV0.013%+49 µV 0.013%+93 µV

3V 100 µV 0.01%+.3 mV 0.013%+.38 mV 0.013%+.64 mV

30V 1 mV 0.01%+4 mV 0.013%+4.9 mV 0.026%+9.5 mV

150/300V 10 mV 0.01%+30 mV 0.013%+40 mV 0.052%+64 mV

Resistance Accuracy

300Ω 10 m Ω 0.02%+60 mΩ 0.02%+.1Ω .02%+.2Ω

3 kΩ 100 mΩ 0.02%+6Ω 0.02%+1Ω .02%+3Ω

30 kΩ 1Ω 0.02%+6Ω 0.02%+10Ω .02%+300Ω

300 kΩ 10 Ω 0.5%+80Ω 0.5%+150Ω 1.0%+3 kΩ

3 MΩ 10 0Ω 1.3%+1 kΩ 1.3%+2 kΩ 2.0%+200 kΩ

Data Acquisition Full Line Specifications Fluke Corporation 5

σσ

σ, ± (%input + V) 18 to 28°C

σσ

1,4

(4-wire), 3

σσ

σ, ±(% input+Ω )

σσ

Measurement accuracy cont.

Model 2640A

AC Voltage

1,2

Range Resolution Frequency Accuracy

Slow Fast

300mV 1 µV 20 Hz-50 Hz 3.0%+25 6.0%+50

50 Hz-20 kHz 0.4%+25 1.0%+50
20 kHz-50 kHz 2.0%+30 3.0%+50
50 kHz-100 kHz 5.0%+50 5.0%+100

3V 100 µV Same frequencies, similar accuracies as above

30V 1 mV Same frequencies, similar accuracies as above

150/300V 10mV Same frequencies, similar accuracies as above

1,5

RTD (Pt 100) Accuracy

σσ

, 3

σ, ± °C (4-wire)

σσ

Temperature Resolution 90 Day, 1 Year,
°C °C18 to 28°C18 to 28°C

Slow Slow Slow

-200°C0.003 0.06 0.09

0°C0.003 0.09 0.13

100 °C0.003 0.10 0.16

300°C0.003 0.14 0.21

600°C0.003 0.19 0.30

Frequency Measurement Accuracy

1,8

, -20 to 60°C

Range Resolution Accuracy, 3

Slow Fast Slow Fast

15 Hz-900 Hz 0.01 Hz 0.1 Hz 0.05%+0.02 Hz 0.05%+0.2 Hz

900 Hz-9 kHz 0.1 Hz 1 Hz 0.05%+0.1 Hz 0.05%+1 Hz

9 kHz-90 kHz 1 Hz 10 Hz 0.05%+1 Hz 0.05%+10 Hz

90 kHz-900 kHz 10 Hz 100 Hz 0.05%+10 Hz 0.05%+100 Hz

1 MHz 100 Hz 1 kHz 0.05%+100 Hz 0.05%+1 kHz

Frequency Measurement Sensitivity (sine wave)

Frequency Minimum Signal Maximum Signal

15 Hz - 200 Hz 100 mV rms 150/300V rms

200 Hz - 70 kHz 100 mV rms 30V rms

70kHz - 100 kHz 100 mV rms 20V rms

100 kHz - 200 kHz 150 mV rms 10V rms

200 kHz - 300 kHz 150 mV rms 7V rms

300 kHz - 1 MHz linearly increasing from linearly decreasing from

150 mV rms at 300 kHz to 7V rms at 300 kHz to
2V rms at 1 MHz 2V rms at 1 MHz

1

Total instrument accuracy for the indicated time period and ambient temperature
range. Includes A/D errors, linearization conformity, initial calibration error,
isothermality errors, reference junction conformity and power line voltage effects
within the range from 107VAC to 264VAC.

2

Sine wave inputs >2000 counts (slow), >200 counts (fast). Accuracies for crest
factor ≤2.0.

3

For two-wire measurements add 5Ω to basic accuracy (does not include lead­wire resistances).

4

For two-wire measurements add 700-1000Ω to basic accuracy (does not include
lead-wire resistances). Ohms varies due to the resistance of the solid state
switches.

5

DIN/IEC 751 only, assumes no lead-wire resistance errors.

σσ

,3

σ,±(% input+counts)

σσ

σσ

σ,± (% input +Hz)

σσ

Model 2645A

AC Voltage

1,2

Range Resolution Frequency Accuracy

σσ

,3

σ,± (% input+counts)

σσ

Slow Fast

300mV 10 µV 20 Hz-50 Hz 3.0%+25 6.0%+50

50 Hz-20 kHz 0.4%+25 1.0%+50
20 kHz-50 kHz 2.0%+30 3.0%+50
50 kHz-100 kHz 5.0%+50 5.0%+100

3V 100 µV Same frequencies, similar accuracies as above

30V 1 mV Same frequencies, similar accuracies as above

1,5

RTD (Pt 100) Accuracy

σσ

, 3

σ, ± °C (4-wire)

σσ

Temperature Resolution 90 Day, 1 Year,
°C °C18 to 28°C18 to 28°C

Slow Slow Slow

-200°C0.030.160.25

0°C0.030.20 0.31

100 °C0.030.23 0.34

300°C0.030.30 0.41

600°C0.030.53 0.63

Frequency Measurement Accuracy

Range Resolution Accuracy, 3

1,8

, -20 to 60°C

σσ

σ,± (% input +Hz)

σσ

Slow Fast Slow Fast

15 Hz-900 Hz 0.01 Hz 0.1 Hz 0.05%+0.02 Hz 0.05%+0.2 Hz

900 Hz-9 kHz 0.1 Hz 1 Hz 0.05%+0.1 Hz 0.05%+1 Hz

9 kHz-90 kHz 1 Hz 10 Hz 0.05%+1 Hz 0.05%+10 Hz

90 kHz-900 kHz 10 Hz 100 Hz 0.05%+10 Hz 0.05%+100 Hz

1 MHz 100 Hz 1 kHz 0.05%+100 Hz 0.05%+1 kHz

Frequency Measurement Sensitivity (sine wave)

Frequency Minimum Signal Maximum Signal

15 Hz - 200 Hz 100 mV rms 30V rms

200 Hz - 70 kHz 100 mV rms 30V rms

70kHz - 100 kHz 100 mV rms 20V rms

100 kHz - 200 kHz 150 mV rms 10V rms

200 kHz - 300 kHz 150 mV rms 7V rms

300 kHz - 1 MHz linearly increasing from linearly decreasing from

150 mV rms at 300 kHz to 7V rms at 300 kHz to
2V rms at 1 MHz 2V rms at 1 M Hz

6

Resolution is 0.02°C or 0.04°F over the useful range of base metal thermocouples
(J, K, T, E, N) and 0.1°C or 0.2°F resolution for types R, S, B, and C with slow
scan.

7

Resolution is 0.2°C or 0.4°F over the useful range of base metal thermocouples (J,
K, T, E, N) and 1.0°C or 2.0°F resolution for types R, S, B, and C with slow scan.

8

Accuracy for both slow and fast scan speeds.

9

Open thermocouple detection is performed on each thermocouple channel unless
defeated by computer command.

10

When NetDAQ is mounted on its side, using the Y2642 adapter or other means,
thermocouples at the ends of the input connector module may have an
additional ± 0.25°C error..

6 Fluke Corporation Data Acquisition Full Line Specifications

Totalizing inputs

DC coupled, non-isolated, max
+30V, min -4V

Max count: 4,294,967,295
Minimum signal: 2V peak
Threshold: 1.4V
Rate: 0-5 kHz (debounce off)
Hysteresis: 500 mV
Input debouncing: None or

1.66 ms

Digital inputs

Threshold: 1.4V
Hysteresis: 500 mV
Maximum input: +30V,

min -4V; non-isolated

Digital/master alarm outputs

The open collector output lines
are non-isolated, TTL compat­ible with the following logic
levels:

Logical “zero” output:

0.8V max |out = -1.0 mA
(1 LSTTL load equivalent)

1.8V max |out = -20 mA

3.25V max |out = -50 mA

Logical “one” output:

Output voltage depends on

external load

3.8V min |out = 0.05 mA
(1 LSTTL load equivalent)

Alarm associations

Each Digital I/O may be ran­domly assigned as a digital
input, status output, or alarm
output (associated with any
input channel or channels)

Trigger input

Minimum pulse: 5 µs
Minimum latency: 2 ms
Repeatability: 1 ms
Input “High”: 2.0V min, 7.0V max
Input “Low”: -0.6V min, 0.8V max

non-isolated, contact closure
and TTL compatible

Clock

Accurate to within 1 minute/
month for 0°C to 50°C range

Power

107 to 264 VAC, 50 or 60 Hz
(<15W), or 9 to 16 VDC (<6W)
(if both sources are applied
simultaneously, the greater of
AC or DC is used.), at 120 VAC
the equivalent DC voltage ~14.5V

Temperature, humidity
(non-condensing)

Operating: -20°C to 28°C,

≤90% RH; 28°C to 40°C, ≤75%
RH; 40°C to 60°C, ≤50% RH
Storage: -40°C to 70°C, 5% to
95% RH

Altitude

Operating: 2000m
Storage: 12,200m

Electromagnetic
interference (EMI)

FCC-15B Class B Equipment,
Vfg. 243, European Norms
EN50081-1 and EN50082-1, CE.
When shielded cables are used.

Safety

Complies with applicable sec­tions of the IEC 1010-1, ANSI/
ISA-S82.01-1994, CSA-C22.2
No. 1010.1-92. Overvoltage Cat­egory II

Weight

3.7 kg

Size

9.3 cm H, 21.6 cm W, 36.2 cm D

Battery life

10 years minimum for real time
clock (from date of manufacture)

Interfaces

Ethernet: Conforms to IEEE

802.3 Ethernet standard,
compatible with 10Base2 and
10BaseT standards, uses TCP/IP
protocol
RS-232C: For calibration only.
The optional NetDAQ Service
Manual provides step-by-step
calibration instructions.

Data buffer memory

Stored with each scan: time

•

stamp, all defined analog
input channels, the status of
the eight digital I/O, and the
totalizer count.
The number of stored scans

•

varies with the number of
channels configured. The
following table shows the
scan size and time it takes to
fill the data buffer memory.

# of channels # of scans 2640A’s buffer 2645A’s buffer
configured stored (100 rps) (1,000 rps)

16,400 48 sec (118 rps) 14 sec (427 rps)

25,688 77 sec (131 rps) 17 sec (628 rps)

54,266 133 sec (142 rps) 23 sec (886 rps)

10 3,011 183 sec (145 rps) 29 sec (1019 rps)

20 1,896 227 sec (147 rps) 33 sec (1102 rps)

Time to fill the Time to fill the

Data Acquisition Full Line Specifications Fluke Corporation 7

2680A (Chassis)

20 to 120 channels

•

Universal inputs

•

10 BaseT / 100 BaseT operation

•

2686A (Chassis)

Same as 2680A, plus:

PC ATA flash memory card to 2 GB

•

Stand-alone operation or networked

•

2680A-PAI
Precision Analog Input Module

High Isolation

•

Precision thermocouple measurements

•

2680A-FAI
Fast Analog Input Module

High data throughput

•

Fast scanning rates

•

2680A-DIO
Digital I/O and Relay Module

20 addressable DIO

•

8 relay contacts

•

Up/down totalizer

•

2680A Series

Models 2680A and 2686A

2680A Series

Channel capacity
(2680A or 2686A)

20 to 120 channels per chassis
(6 analog input modules of 20
channels each)
One master alarm (open collec­tor) per chassis
Communications: 10BaseT/
100BaseT, TCP/IP via RJ45
connector, Cat 5

Math functions

In addition to its analog and digi­tal input channels, each system
supports 60 computed channels.
Calculations include: time & rate,
addition, subtraction, multiplica­tion, division, log, natural log,
exponent, square root, absolute
value, integer function and
average.

Measurement speed
(2680A-PAI)

Slow: 6 readings/second nominal
Medium: 41 (50 Hz), 48 (60 Hz)

readings/sec
Fast: 143
nominal (5
VAC nominal, 140
secon
ings/sec

ond nominal

readings/sec

readings/sec

d on 300Ω range, 37

ond on 3 MΩ range)

ond

ond for

readings/

read-

Measurement speed
(2680A-FAI)

Slow: 45 (50 Hz), 54 (60 Hz)
readings/sec
Medium: 200
nominal
Fast: 1000
nominal (5
VAC nominal, 370
sec

ond on 300Ω range, 44

readings/sec

Analog to digital converter

2680A-PAI: Multi-slope type,
linear to 18 bits
2680A-FAI: Multi-slope type,
linear to 16 bits

Common mode rejection

2680A-PAI:

AC: ≥120 dB (50/60 Hz, ±0.1%
max 1kΩ source imbalance)
DC: ≥120 dB

2680A-FAI:

AC: ≥100 dB (50/60 Hz, ±0.1%
max 1kΩ source imbalance)
DC: ≥100 dB

ond nominal

readings/sec

readings/sec
readings/sec

readings/

ond on 3 MΩ range)

ond

ond
ond for

Normal mode rejection

50 dB @ 50/60 Hz, ± 0.1%

Common mode voltage
maximum

2680A-PAI: 300 VDC or VAC
rms (channels 1,11); 150 VDC or
VAC rms (all other channels)
2680A-FAI: 50 VDC or 30 VAC
rms (all channels)

8 Fluke Corporation Data Acquisition Full Line Specifications

Measurement accuracy

Model 2680A-PAI

1,6

Accuracy

Thermocouples

9

18 to 28°C-10 to 60°C

ITS90 90 Day 1 Year 1 Year

Type Temp (°C) Slow Slow Fast Slow Fast

J-100°Cto80°C 0.45 0.5 0.8 0.6 0.8

80°Cto230°C 0.35 0.5 0.7 0.6 0.8

230°Cto760°C 0.4 0.5 0.7 0.8 0.9

K-100°Cto-25°C 0.55 0.6 0.9 0.7 1.0

-25°Cto120°C 0.4 0.5 0.8 0.6 0.9
120°Cto800°C 0.5 0.65 0.9 1.0 1.2
800°Cto1372°C 0.7 1.0 1.3 1. 6 1. 9

N-100°Cto-25°C 0.65 0.75 1.2 0.8 1.3

-25°Cto120°C 0.55 0.6 1.0 0.7 1.1
120°Cto1000°C 0.45 0.6 0.9 1.0 1.2

1000°Cto1300°C 0.55 0.75 1.0 1.2 1.5

E-100°Cto-25°C 0.45 0.5 0.8 0.6 0.8

-25°Cto20°C 0.35 0.4 0.6 0.5 0.7

20°Cto600°C 0.3 0.4 0.6 0.5 0.8

600°Cto1000°C 0.4 0.5 0.7 0.9 1.0

T-100°Cto0°C 0.6 0.65 1.0 0.7 1.1

0°Cto150°C 0.4 0.5 0.8 0.6 0.9

150°Cto400°C 0.3 0.4 0.6 0.6 0.8

R 250°Cto600°C 0.9 1.0 2.1 1.2 2.2

600°Cto1500°C 0.8 0.9 1.8 1.3 2.0

1500°Cto1767°C 0.85 0.85 1.9 1.7 2.5

S 250°Cto1000°C 0.95 1.1 2.3 1.3 2.4

1000°Cto1400°C 0.8 1.0 1.9 1.4 2.3
1400°Cto1767°C1.0 1.3 2.2 1.8 2.8

B600°Cto900°C1.2 1.4 3.1 1. 5 3.2

900°Cto1200°C 0.9 1.0 2.2 1.2 2.4

1200°Cto1820°C 0.75 1.0 1.9 1.3 2.2

C0°Cto150°C 0.8 0.9 1.6 1.0 1.7

150°Cto650°C 0.65 0.75 1.4 1.0 1.5
650°Cto1000°C 0.65 0.85 1.4 1.2 1.8

1000°Cto1800°C1.0 1.3 2.1 2 .1 2.8
18 00°Cto2316°C1.6 2.1 3.2 3.4 4.6

L-100°Cto100°C 0.9 1.0 2.0 1.3 2.0

100°Cto800°C 0.5 0.9 1.4 1.2 1.7
800°Cto900°C 0.5 0.7 1.1 1.3 1.5

U-100°Cto0°C1.51.52.6 1.6 3.0

0°Cto600°C 0.6 0.8 1.6 1.1 1.9

, 3

σσ

σ, ± °C

σσ

Model 2680A-FAI

1,6

, 3

σσ

σ, ± °C

σσ

Thermocouples

Accuracy

9

18 to 28°C-10 to 60°C

ITS90 90 Day 1 Year 1 Year

Type Temp (°C) Slow Slow Fast Slow Fast

J-100°Cto80°C 0.8 0.9 1.6 0.9 1.7

80°Cto230°C 0.7 0.8 1.4 0.9 1.5

230°Cto760°C 0.7 0.8 1.3 1.0 1.5

K-100°Cto-25°C1.01.12.0 1.2 2.1

-25°Cto120°C 0.8 0.9 1.7 1.0 1.8

120°Cto1000°C 0.9 1.1 1.8 1.5 2.2

1000°Cto1372°C1.2 1.5 2.3 2.0 2.9

N-100°Cto-25°C1.41.52.8 1.5 2.9

-25°Cto120°C1.11.32.3 1.3 2.4

120°Cto1000°C1.0 1.1 2.0 1.2 2.1

1000°Cto1300°C1.0 1.2 1.9 1.6 2.4

E-100°Cto-25°C 0.8 0.9 1.5 1.0 1.6

-25°Cto20°C 0.7 0.7 1.2 0.8 1.3
20°Cto600°C 0.6 0.7 1.1 0.8 1.2

600°Cto1000°C 0.6 0.8 1.2 1.1 1.5

T-100°Cto0°C1.11.22.2 1.3 2.3

0°Cto150°C 0.9 1.0 1.7 1. 0 1. 8

150°Cto400°C 0.7 0.8 1.4 0.8 1.5

R 250°Cto600°C 2.4 2.7 5.6 2.8 5.7

600°Cto1500°C 2.0 2.3 4.6 2.4 4.8

1500°Cto1767°C 2.0 2.3 4.5 2.8 5.1

S 250°Cto1000°C 2.6 2.8 5.9 2.9 6.0

1000°Cto1400°C 2.0 2.3 4.6 2.6 5.0
1400°Cto1767°C 2.3 2.7 5.3 3.3 5.9

B600°Cto1200°C 3.6 3.9 8.5 4.0 8.6

1200°Cto1550°C2.1 2.4 5.0 2.6 5.2
1550°Cto1820°C 2.0 2.3 4.7 2.7 5.0

C0°Cto150°C1.92.0 4.0 2.1 4.2

150°Cto650°C1.6 1.7 3.5 1.8 3.6

650°Cto1000°C1.4 1.7 3.2 2.0 3.5
1000°Cto1800°C 2.0 2.5 4.5 3.2 5.3
18 00°Cto2316°C3.1 3.8 6.8 5.1 8.1

L-100°Cto100°C1.21.32.9 1.6 3.1

100°Cto800°C 0.9 1.0 2.1 1.2 2.3

800°Cto900°C 0.7 0.8 1.3 1.0 1.5

U-100°Cto0°C 2.0 2.1 4.3 2.2 4.6

0°Cto600°C1.3 1.4 2.5 1.6 2.6

Model 2680A-PAI

DC Voltage Accuracy1, 3

Range Resolution 90 Day 1 Year

Slow Slow Fast

90 mV .3 µV 0.01%+7 µV 0.013%+8 µV 0.013%+18 µV
300 mV 1 µV 0.01%+15 µV 0.013%+17 µV 0.013%+35 µV

3V 10 µV 0.01%+.1 mV 0.013%+.15 mV 0.013%+.2 mV
30V 100 µV 0.01%+1.5 mV 0.013%+1.7 mV 0.026%+3.5 mV
150/300V 1 mV 0.01%+15 mV 0.013%+17 mV 0.052%+35 mV

Resistance Accuracy

300Ω 1 mΩ 0.015%+20 mΩ 0.02%+30 mΩ 0.02%+120 mΩ
3 kΩ 10 m Ω 0.02%+.3Ω 0.02%+.5Ω 0.02%+.1.2Ω

30 kΩ 100 mΩ 0.03%+3Ω 0.03%+5Ω 0.04%+15Ω
300 kΩ 1Ω 0.1%+40Ω 0.1%+60Ω 0.2%+150Ω
3 MΩ 10 Ω 0.25%+800Ω 0.25%+1 kΩ 0.5%+1.5 kΩ

1,3

σσ

σ, ±(%input + V) 18 to 28°C

σσ

(4-wire), 3

σσ

σ, ±(% input+Ω )

σσ

Model 2680A-FAI

DC Voltage Accuracy1, 3

Range Resolution 90 Day 1 Year

Slow Slow Fast

90 mV 3 µV 0.01%+20 µV0.013%+23 µV 0.013%+50 µV
300 mV 10 µV 0.01%+40 µV0.013%+49 µV 0.013%+93 µV

3V 100 µV 0.01%+.3 mV 0.013%+.38 mV 0.013%+.64 mV
30V 1 mV 0.01%+4 mV 0.013%+4.9 mV 0.026%+9.5 mV
150/300V 10 mV 0.01%+30 mV 0.013%+40 mV 0.052%+64 mV

Resistance Accuracy

300Ω 10 m Ω 0.02%+60 mΩ 0.02%+.1Ω .02%+.2Ω
3 kΩ 100 mΩ 0.02%+6Ω 0.02%+1Ω .02%+3Ω

30 kΩ 1Ω 0.02%+6Ω 0.02%+10Ω .02%+300Ω
300 kΩ 10 Ω 0.5%+80Ω 0.5%+150Ω 1.0%+3 kΩ
3 MΩ 10 0Ω 1.3%+1 kΩ 1.3%+2 kΩ 2.0%+200 kΩ

Data Acquisition Full Line Specifications Fluke Corporation 9

1,3

σσ

σ, ± (%input + V) 18 to 28°C

σσ

(4-wire), 3

σσ

σ, ±(% input+Ω )

σσ

Measurement accuracy cont.

Model 2680A-PAI

AC Voltage

1,2

Range Resolution Frequency Accuracy

Slow Fast

300mV 1 µV 20 Hz-50 Hz 3.0%+25 6.0%+50

50 Hz-20 kHz 0.4%+25 1.0%+50
20 kHz-50 kHz 2.0%+30 3.0%+50
50 kHz-100 kHz 5.0%+50 5.0%+100

3V 100 µV Same frequencies, similar accuracies as above

30V 1 mV Same frequencies, similar accuracies as above

150/300V 10mV Same frequencies, similar accuracies as above

1,5

RTD (Pt 100) Accuracy

σσ

, 3

σ, ± °C (4-wire)

σσ

Temperature Resolution 90 Day, 1 Year,
°C °C18 to 28°C18 to 28°C

Slow Slow Slow

-200 0.003 0.06 0.09

00.003 0.09 0.13

100 0. 00 3 0.10 0.16

300 0.003 0.14 0.21

600 0.003 0.19 0.30

Thermistor10 2 k to 100 kΩ

-40 °C to 150 °C0.003 0.3 0.4

Frequency Measurement Accuracy

1,8

, -20 to 60°C

Range Resolution Accuracy, 3

Slow Fast Slow Fast

15 Hz-900 Hz 0.01 Hz 0.1 Hz 0.05%+0.02 Hz 0.05%+0.2 Hz

900 Hz-9 kHz 0.1 Hz 1 Hz 0.05%+0.1 Hz 0.05%+1 Hz

9 kHz-90 kHz 1 Hz 10 Hz 0.05%+1 Hz 0.05%+10 Hz

90 kHz-900 kHz 10 Hz 100 Hz 0.05%+10 Hz 0.05%+100 Hz

1 MHz 100 Hz 1 kHz 0.05%+100 Hz 0.05%+1 kHz

Frequency Measurement Sensitivity (sine wave)

Frequency Minimum Signal Maximum Signal

15 Hz - 200 Hz 100 mV rms 150/300V rms

200 Hz - 70 kHz 100 mV rms 30V rms

70 kHz - 100 kHz 100 mV rms 20V rms

100 kHz - 200 kHz 150 mV rms 10V rms

200 kHz - 300 kHz 150 mV rms 7V rms

300 kHz - 1 MHz linearly increasing from linearly decreasing from

150 mV rms at 300 kHz to 7V rms at 300 kHz to
2V rms at 1 MHz 2V rms at 1 MHz

1

Total instrument accuracy for the indicated time period and ambient temperature
range. Includes A/D errors, linearization conformity, initial calibration error,
isothermality errors, reference junction conformity and power line voltage effects
within the range from 100VAC to 264VAC.

2

Sine wave inputs >2000 counts (slow), >200 counts (fast). Accuracies for crest
factor ≤2.0.

3

For two-wire measurements add 5Ω to basic accuracy (does not include lead­wire resistances).

4

For two-wire measurements add 700-1000Ω to basic accuracy (does not include
lead-wire resistances). Ohms varies due to the resistance of the solid state
switches.

5

DIN/IEC 751 only, assumes no lead-wire resistance errors.

σσ

,3

σ,±(% input+counts)

σσ

σσ

σ,± (% input +Hz)

σσ

Model 2680A-FAI

AC Voltage

1,2

Range Resolution Frequency Accuracy

σσ

,3

σ,± (% input+counts)

σσ

Slow Fast

300mV 10 µV 20 Hz-50 Hz 3.0%+25 6.0%+50

50 Hz-20 kHz 0.4%+25 1.0%+50
20 kHz-50 kHz 2.0%+30 3.0%+50
50 kHz-100 kHz 5.0%+50 5.0%+100

3V 100 µV Same frequencies, similar accuracies as above

30V 1 mV Same frequencies, similar accuracies as above

1,5

RTD (Pt 100) Accuracy

σσ

, 3

σ, ± °C (4-wire)

σσ

Temperature Resolution 90 Day, 1 Year,
°C °C18 to 28°C18 to 28°C

Slow Slow Slow

-200 0.03 0.16 0.25

00.030.20 0.31

100 0. 03 0.23 0.34

300 0.03 0.30 0.41

600 0.03 0.53 0.63

Thermistor 10 k to 100 kΩ

-40 °C to 150 °C0.03 0.4 0.5

Frequency Measurement Accuracy

Range Resolution Accuracy, 3

1,8

, -20 to 60°C

σσ

σ,± (% input +Hz)

σσ

Slow Fast Slow Fast

15 Hz-900 Hz 0.01 Hz 0.1 Hz 0.05%+0.02 Hz 0.05%+0.2 Hz

900 Hz-9 kHz 0.1 Hz 1 Hz 0.05%+0.1 Hz 0.05%+1 Hz

9 kHz-90 kHz 1 Hz 10 Hz 0.05%+1 Hz 0.05%+10 Hz

90 kHz-900 kHz 10 Hz 100 Hz 0.05%+10 Hz 0.05%+100 Hz

1 MHz 100 Hz 1 kHz 0.05%+100 Hz 0.05%+1 kHz

Frequency Measurement Sensitivity (sine wave)

Frequency Minimum Signal Maximum Signal

15 Hz - 200 Hz 100 mV rms 30V rms

200 Hz - 70 kHz 100 mV rms 30V rms

70 kHz - 100 kHz 100 mV rms 20V rms

100 kHz - 200 kHz 150 mV rms 10V rms

200 kHz - 300 kHz 150 mV rms 7V rms

300 kHz - 1 MHz linearly increasing from linearly decreasing from

150 mV rms at 300 kHz to 7V rms at 300 kHz to
2V rms at 1 MHz 2V rms at 1 M Hz

6

Resolution is 0.02°C or 0.04°F over the useful range of base metal thermocouples
(J, K, T, E, N, L, U) and 0.1°C or 0.2°F resolution for types R, S, B, and C with
slow scan.

7

Resolution is 0.2°C or 0.4°F over the useful range of base metal thermocouples (J,
K, T, E, N, L, U) and 1.0°C or 2.0°F resolution for types R, S, B, and C with slow
scan.

8

Accuracy for both slow and fast scan speeds.

9

Open thermocouple detection is performed on each thermocouple channel unless
defeated by computer command.

10

Using Stein hart – Hart thermistor polynomial: T = A+B (InR) + C (InR)
T = temp in °K
A, B and C = fitting constants
R = resistance of thermistor in Ω.

3

10 Fluke Corporation Data Acquisition Full Line Specifications

2680A-DIO

Totalizing input

Pre-settable starting count
up/down counter

DC coupled, non-isolated, max
+30V, min -4V

Max count: 4,294,967,295
Minimum signal: 2V peak
Threshold: 1.4V
Rate: 0-5 kHz (debounce off)
Hysteresis: 500 mV
Input debouncing: None or

1.66 ms

Digital inputs/outputs: 20

Threshold: 1.4V
Hysteresis: 500 mV
Maximum input: +30V,

min -4V; non-isolated

Logical “zero” output:

0.8V max |out = -1.0 mA
(1 LSTTL load equivalent)

1.8V max |out = -20 mA

3.25V max |out = -50 mA

Logical “one” output:

Output voltage depends on
external load

3.8V min |out = 0.05 mA
(1 LSTTL load equivalent)

Relays

Quantity: 8
Type: Form C; DPST
Current: 1 amp, non-inductive
Operation time: 75 ms

Alarm associations

Each Digital I/O may be ran­domly assigned as a digital
input, status output, or alarm
output (associated with any
input channel or channels)

General Specifications

Trigger input

Minimum pulse: 5 µs
Minimum latency: 100 ms
Input “High”: 2.0V min, 7.0V max
Input “Low”: -0.6V min, 0.8V max

non-isolated, contact closure
and TTL compatible

Clock

Accurate to within 1 minute/
month for 0°C to 50°C range

Power

100 to 240 VAC, 50 or 60 Hz
100 VA max, or 9 to 45 VDC
(50W DC) (if both sources are
applied simultaneously, the
greater of AC or DC is used.),
at 120 VAC
voltage ~14.5V

Temperature, humidity
(non-condensing)

Operating: -20°C to 28°C,

≤90% RH; 28°C to 40°C, ≤75%
RH; 40°C to 60°C, ≤50% RH
Storage: -40°C to 70°C, 5% to
95% RH

Altitude

Operating: 2000m
Storage: 12,200m

Standards

the equivalent DC

2686A memory card storage capacity

2686A — Active channels and number of scans to card capacity

Memory Card /

Active Channels 20 ch 40 ch 60 ch 80 ch 100 ch 120 ch

16 M B 100,5 48 66,765 50,074 40,059 33,382 28,613

128 MB 800,000 528,000 400,000 320,000 264,000 224,000

256 MB 1.6 M 1.056M 800,000 640,000 528,000 448,000

512 MB 3.2 M 2.112 M 1.6 M 1.28 M 1.056 M 896,000

1 GB 6.2 M 4.224 M 3.2 M 2.56 M 2.112 M 1.792 M

Estimating space: 80 bytes / scan + 4 bytes / channel scanned (allow 4.5% overhead for card
formatting)

All inputs: IEC Overvoltage
rating Category II
Product conforms to the fol­lowing safety and emisssion
standards:

EN50082-2
EN55022-1
EN55011 class A
EN610000-4-2,3,4,6,8
EN61326
EN61010-1, CAT II
CSA C22.2 No. 1010.1

Operating temperature

-20°C to 60°C (-4°F to +140°F)

Storage temperature

-40°C to 70°C (-40°F to +158°F)

Size

18.6˝ x 17˝ x 9.3˝
(473 mm x 423 mm x 237 mm)

Weight

2680A/2686A chassis only:

18.86 lbs. (8.47 kg)
2680A-FAI: 1.74 lbs. (0.79 kg)
2680A-PAI: 2.66 lbs. (1.21 kg)
2680A-DIO: 1.75 lbs. (0.80 kg)

Interfaces

Ethernet: Conforms to IEEE

802.3 Ethernet standard,
compatible with 100BaseT and
10BaseT standards, uses TCP/IP
protocol
RS-232C: For calibration only

Data Acquisition Full Line Specifications Fluke Corporation 11

Fluke measurement specification
philosophy

The accuracy specifications for the
2680A, Hydra and NetDAQ instruments
are calculated conservatively so that
they include 3 standard deviations
from the nominal value: this is referred
to as 3-Sigma. Greater than 99.7% of
the instruments produced will perform
within the error limits. Rigorous
screening and testing procedures catch
and correct the 3 out of 1000 instru­ments which would have fallen outside
their published specifications. Many
other products use a ‘root-sum-square’
scheme, or only specify the error band
within 1 standard deviation (1-Sigma)
of nominal. This method produces a
specification that appears to be more
accurate, but the resulting “typical”
specifications correctly characterize
only ~66% of the instruments pro­duced. This method is kind of like
knowing how accurate “most of the
instruments” will be. Our 3-Sigma
specifications tell you how accurate
ALL of the instruments will be.

Fluke. Keeping your world

up and running.

Fluke Corporation

PO Box 9090, Everett, WA USA 98206
Fluke Europe B.V.

PO Box 1186, 5602 BD
Eindhoven, The Netherlands

For more information call:
U.S.A. [phone] or
Fax [phone]
Europe/M-East/Africa
(31 40) 2 675 200 or
Fax [phone]
Canada (800) 36-FLUKE or
Fax [phone]
Other countries [phone] or
Fax [phone]
Web access: http://www.fluke.com

©2002 Fluke Corporation. All rights reserved.
Printed in U.S.A. 3/2002 1264012 D-ENG-N Rev C

Printed on recycled paper.