MEILHAUS REDLAB WEBDAQ316 Datasheet

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Am Sonnenlicht 2
D-82239 Alling bei München

16 thermocouple channels

1 internal cold-junction compensation channel

ADC resolution

24 bits

Type of ADC

Delta-Sigma

Sampling mode

Scanned

Voltage measurement range

±78.125 mV

Temperature measurement
ranges

Works over temperature ranges defined by NIST
(J, K, T, E, N, B, R, S thermocouple types)

Sample Rate (all channels): 1 S/s

High-speed mode:

Common-mode voltage
range

Channel-to-COM: ±1.2 V min
COM-to-earth ground: ±250 V

High-resolution mode at DC
and 50 to 60 Hz

Channel-to-COM: 100 dB
COM-to-earth ground: >170 dB

Channel-to-COM: 70 dB
High-resolution mode

14.4 Hz

High-speed mode

78 Hz

High-resolution noise
Overvoltage protection

±30 V between any two inputs

impedance

Input current

50 nA

High-resolution mode

200 nVrms

High-speed mode

7 µVrms

0.03% typ at 25 °C

0.15% max at 0 °C to 60 °C

0.16% max at 0 °C to 60 °C

High-resolution mode

4 µV typ, 6 µV max

High-speed mode

14 µV typ, 17 µV max

Offset error from source

Add 0.05 µV per Ω, when source impedance

Specifications

All specifications are subject to change without notice.
Typical for 0 °C to 50 °C unless otherwise specified.

Thermocouple input

Table 1. Thermocouple input specifications

Parameter Condition Specification

Number of channels

Timing mode

Common-mode rejection
ratio (CMMR)

Input bandwidth

Automatically set for either high­resolution or high-speed mode based
on the requested scan rate,
regardless of the number of
channels.

High-speed mode at 0 to 60 Hz

1 internal auto zero channel

High resolution mode:

 Requested scan rate: ≤1 Hz
 Conversion Time (per channel): 55 ms



 Requested scan rate: >1 Hz
 Conversion Time (per channel): 740 µs
 Sample Rate

(all channels): 75 S/s

COM-to-earth ground: >150 dB

rejection

Differential input

Input noise

Gain error

Offset error

impedance

50 Hz and 60 Hz 60 dB

78 MΩ

High-resolution mode

0.07% typ at 0 °C to 60 °C

0.04% typ at 25 °C

High-speed mode

0 °C to 60 °C

0.08% typ at 0 °C to 60 °C

>50 Ω

Parameter Condition Specification

Cold-junction compensation
accuracy

The device is lying flat or facing

temperature.

Measurement sensitivity

High-resolution mode

Type J, K, T, E, N: <0.02 °C

High-speed mode

Type J, K, T, E: <0.25 °C

Type R, S: <2.8 °C

0.8 °C typ, 1.7 °C max

Warm-up time

upward and is in a constant ambient

15 minutes recommended

Temperature measurement accuracy

Measurement sensitivity represents the smallest change in temperature that a sensor can detect. It is a function
of noise. The values assume the full measurement range of the standard thermocouple sensor per
ASTM E230-87.

Table 2. Temperature accuracy specifications

Parameter Condition Specification

Type B, R, S: <0.15 °C

Type N: <0.35 °C
Type B: <1.2 °C

The following figures show the errors for each thermocouple type when connected to the WebDAQ 316 with
auto zeroing performed. The figures display the maximum error over a full temperature range, and the typical
error at room temperature. The figures account for gain errors, offset errors, differential and integral
nonlinearity, quantization errors, noise errors, 50 Ω lead wire resistance, and cold-junction compensation errors.
The figures do not account for the accuracy of the thermocouple itself.

Thermocouple Types J and N Errors

Thermocouple Type K Errors

Thermocouple Types T and E Errors

Thermocouple Type B Errors

Digital input/output

Digital type

CMOS (Schmitt trigger) input / open drain output

Number of I/O

One port of 4 bits

Configuration

Each bit can be independently configured for input or output

Power on conditions

Power on reset is input mode

Pull-up configuration

Each bit is pulled up to 5 V with a 100 kΩ resistor

Input frequency range

DC – 10 kHz (Note 1)

Input high voltage threshold

1.9 V min, 3.6 V max

Input low voltage threshold

2.3 V max, 1.0 V min

Schmitt trigger hysteresis

0.6 V min, 1.7 V max

Input high voltage limit

15 V max

–0.5 V absolute min
0 V recommended min

0 V to +5 V (no external pull up resistor)
0 V to +15 V max (Note 2)

Output off state leakage
current

capability

Output transistor on­resistance (drain to source)

Parameter Specification

Input low voltage limit

Output voltage range

10 µA max

Thermocouple Types R and S Errors

Table 3. Digital input/output specifications

Output sink current

Note 1: Applying a signal with a frequency higher than this specification will adversely affect system performance and

could cause errors.

Note 2: The external pull-up resistor is connected between the digital output bit and an external supply. Adding an external

pull-up resistor connects it in parallel with the internal 100 kΩ pull-up resistor of that particular digital
input/output bit to the internal 5 V supply. Careful consideration should be made when considering the external
pull-up resistor value and the resultant pull-up voltage produced at the load.

100 mA max (continuous) per output pin

1.6 Ω

Network

100 Base-TX
10 Base-T

Connector

RJ-45, 8 position

Cable length

100 meters (328 feet) max

Additional parameters

HP Auto-MDIX support

DHCP, link-local, static

back to link-local and request the IP address 169.254.100.100.

The default name is webdaq-xxxxxx, where xxxxxx are the lower 6 digits of the
device MAC address. This name may be changed using the web interface.

Network name publication

By mDNS

Factory default IP address

192.168.0.101

Factory default subnet mask

255.255.255.0

Factory default Gateway

192.168.0.1

Factory default DHCP
setting

Factory default password

admin, case sensitive; can be modified with the web interface

Factory default user name

admin, case sensitive; cannot be changed.

Microprocessor

Type: Quad core Broadcom BCM2837

Memory

RAM: 1 GB LPDDR2

Ethernet connection

Table 4. Ethernet connection specifications

Parameter Specification

Ethernet type

Communication rates 10/100 Mbps, auto-negotiated

Network interface

Table 5. Factory default specifications

Parameter Specification

Network IP configuration

Network name

DHCP may be disabled by the user and a static IP address assigned
If DHCP is enabled but is unsuccessful at obtaining an IP address, the device will fall

Network factory default settings

Table 6. Factory default specifications

Parameter Specification

DHCP + link-local enabled

Processor / Memory

Table 7. Processor / memory specifications

Parameter Specification

Speed: 1.2 GHz

Flash: 4 GB eMMC (3 GB available for user data storage)

USB ports

Number of USB ports

Two

USB device type

USB 2.0 (high-speed)

Device compatibility

USB 1.1, USB 2.0, USB 3.0

Memory card type

SD, SDHC, SDXC, MMC, TransFlash

File systems supported

FAT16, FAT32, exFAT, ext2/3/4, NTFS

1: POWER

Steady yellow

Device is booting up.

Steady green

Device boot is successful.

Blinking yellow

Device is shutting down.

Off

Device is off.

2: STATUS

Blinking yellow

Device is configuring hardware.

Steady green

Hardware configuration is complete.

Flashing green

Waiting for the schedule start condition to be met. (Note 4)
Blinking

The configured schedule start condition is met; waiting for job start
Blinking green

The configured job start condition is met – the job is running. (Note 4)

Off

Device is off.

3: ERROR

Blinking yellow

Error condition is detected. LED blinks even when the software is

Error state is cleared on the next schedule start.

Off

No error is detected, or the device is off

4: MEDIA

Blinking yellow

A job is configured to log to external media, but the job hasn't started
yet; push button will not let you eject media.

Steady yellow

External media is inserted into the SD card slot or USB storage port.

Blinking green

Currently logging to an external SD card or USB storage device.

Steady green

Media has been made safe for removal using the FUNC button, but is
still inserted in the device.

Off

No external media is detected, or the device is off.

Table 8. USB specifications

Parameter Specification

Note 3: The USB ports are provided for connection to a mass storage device or approved WiFi adapter.

SD memory card slot

Table 9. SD card specifications

Parameter Specification

LED indicators

Table 10. LED specifications – normal operating mode

Label State Description

100 ms on,
2s off

heartbeat

Note 4: Use the WebDAQ software to configure start and stop settings for jobs and schedules.

condition to be met. (Note 4)

configured to ignore the error.

Table 11. LED specifications – software update mode

All LEDs

Solid yellow

Software update is starting.

1. POWER

Blinking yellow

Software update is running.

2. STATUS

Blinking green

Update file is located; device is being updated.

Blinking yellow

Update file cannot be located; insert media containing the update file.

3. ERROR

Blinking green

Update is successful; device reboot in approximately 5 seconds.

Blinking yellow

Update failed; user must retry.

Power button

POWER

Variable function:

Function button

FUNC

Dual function:

interface

Factory reset button

CONFIG

Restores network settings to factory default values
Ground connector

#6-32

Connector port for the #6-32 ground screw

Input voltage

Center positive

6 VDC to 16 VDC

Input wattage

4 W typ, 10 W max

External power adapter

MCC p/n PS­9V1AEPS230V

9 V, 1.67 A, 110 VAC to 240 VAC input range

Battery

One 3 V button cell lithium battery (BR1225 or CR1225) required to
maintain time of day clock when device is powered off.

LED State Description

Push buttons

Table 12. Push button specifications

Component Label Description

 Press briefly: turns the device on
 Press for ~1 second: shuts down the device; release the button when

the POWER LED blinks yellow

 Press and hold ~4 seconds: forces the device to power off

 Ejects, or safely unmounts, all removable media for safe removal

from the device (default)
o This function is disabled when a job that uses external media is

running

o The MEDIA LED is steady green when all media is unmounted

but still inserted in the device

 Starts or stops an acquisition; requires configuration via the web

RESET

Ground connector

Table 13. Ground connector specifications

Component Label Description

Power

Table 14. Power specifications

Parameter Conditions Specification

Mechanical

Dimensions (L × W × H)

158.8 × 146.1 × 38.1 mm (6.25 × 5.75 × 1.50 in.)

177.0 × 146.1 × 38.1 mm (6.97 × 5.75 × 1.50 in.) includes spring terminal

Weight

635 g (1.45 lb)

Operating temperature range

0 °C to 50 °C max

Storage temperature range

–40 °C to 85 °C

Ingress protection

IP30

Operating humidity

10% to 90% RH, noncondensing

Storage humidity

5% to 95% RH, noncondensing

Maximum altitude

2,000 m (6,562 ft)

Pollution Degree

2

Between any two terminals

±30 V max

Channel-to-channel isolation

None

Channel-to-earth ground

Continuous

250 Vrms, Measurement Category II (Note 6)

Withstand

2300 Vrms, verified by a 5 second dielectric withstand test

Connector types

36-position spring terminal for thermocouple connections
6-position screw terminal for digital connections

Screw terminal wiring

14 to 30 AWG copper conductor wire with 5 to 6 mm (0.20 to 0.24 in.) of insulation

Spring terminal wiring

16 to 26 AWG copper conductor wire with 10 mm (0.39 in.) of insulation stripped from

Table 15. Mechanical specifications

Parameter Specification

Environmental

Table 16. Environmental specifications

Parameter Specification

Note 5: WebDAQ 316 operation is intended for indoor use only, but may be used outdoors if installed in a suitable

enclosure.

Safety voltages

Connect only voltages that are within the limits specified in this table.

Table 17. Safety specifications

Parameter Conditions Specification

isolation

Note 6: Measurement Category II is for measurements performed on circuits directly connected to the electrical

distribution system. This category refers to local-level electrical distribution, such as that provided by a standard
wall outlet, for example 115 V for US or 230 V for Europe.

Caution! Do not connect the device to signals or use for measurements within Measurement Categories

III or IV.

Signal connectors

Table 18. Screw terminal specifications

Parameter Specification

stripped from the end

the end

Screw terminal

#

Label

Use # Label

Use

1

GND

Digital ground

4

DIO2

Digital bit 2

3

DIO1

Digital bit 1

6

GND

Digital ground

#

Label

Use # Label

Use 1 NC

No connection

29

NC

No connection

2

TC0[+]

Channel 0 HI

30

TC0[–]

Channel 0 LO

3

TC1[+]

Channel 1 HI

31

TC1[–]

Channel 1 LO

4

TC2[+]

Channel 2 HI

32

TC2[–]

Channel 2 LO

5

TC3[+]

Channel 3 HI

33

TC3[–]

Channel 3 LO

6

TC4[+]

Channel 4 HI

34

TC4[–]

Channel 4 LO

8

TC6[+]

Channel 6 HI

36

TC6[–]

Channel 6 LO

10

TC8[+]

Channel 8 HI

38

TC8[–]

Channel 8 LO

11

TC9[+]

Channel 9 HI

39

TC9[–]

Channel 9 LO

12

TC10[+]

Channel 10 HI

40

TC10[–]

Channel 10 LO

13

TC11[+]

Channel 11 HI

41

TC11[–]

Channel 11 LO

14

TC12[+]

Channel 12 HI

42

TC12[–]

Channel 12 LO

15

TC13[+]

Channel 13 HI

43

TC13[–]

Channel 13 LO

17

TC15[+]

Channel 15 HI

45

TC15[–]

Channel 15 LO

Table 19. Screw terminal pinout

Terminal Terminal

2 DIO0 Digital bit 0 5 DIO3 Digital bit 3

Spring terminal

Table 20. Spring terminal pinout

Terminal Terminal

7 TC5[+] Channel 5 HI 35 TC5[–] Channel 5 LO

9 TC7[+] Channel 7 HI 37 TC7[–] Channel 7 LO

16 TC14[+] Channel 14 HI 44 TC14[–] Channel 14 LO

18 COM Common 46 COM Common