DBK98-Channel RTD Card

Overview …… 1
Hardware Setup …… 2
Card Connection …… 2
Card Configuration …… 2DBK9 Calibration …… 3
DaqBook /100 Series & /200 Series and DaqBoard [ISA type] Configuration …… 3
DaqBook/2000 Series & DaqBoard/2000 Series Configuration …… 3
Software Setup …… 3
DBK9 – Specifications …… 3
Reference Notes:
o Chapter 2 includes pinouts for P1, P2, P3, and P4. Refer to pinouts applicable to yoursystem, as needed.
o In regard to calculating system power requirements, refer to DBK Basics located nearthe front of this manual.

Overview
Temperatures sensed by RTDs are attached to the LogBook or the Daq Device through the DBK9 RTD
expansion card.
Up to eight RTDs can attach to each DBK9 and up to 8 DBK9s can attach to the LogBook or the Daq
Device for measuring a maximum of 256 temperatures. The DBK9 card supports 3- or 4-wire RTDs andoperates by reading 3 voltages and using them in the following equation:
RTD = [Va - Vd - 2(Va - Vb) Rsense] / Vd(Result in Ohms)

Where: Rsense = 100 Ω (a constant derived from the actual hardware)
The result of this equation is converted into a temperature via software (using a complex formula andlookup tables). The DBK9 features an on-board Programmable Gain Amplifier for measuring 100 Ω,500 Ω, or 1000 Ω type RTDs. For each RTD, the DBK9 can measure temperatures in a range of-200 to +850°C.

DBK Option Cards and Modules

879895

DBK9, pg. 1

Hardware Setup
Card Connection
The DBK9 is equipped with screw terminals for the connection of 3-wire or 4-wire RTDs as shown in thefigure.

Card Configuration
Factory Defaults:

JP2 RTD Type: 100ohm
JP3 RTD Source Type: 100 ohm
Two aspects of card configuration are the channel address and the RTD type.
Channel Address Jumpers

Channel Group Select (JP4)
One or two DBK9s may be connected to each channel (2×8 signals × 16 channels for a maximum of 256
inputs). Since this is a daisy-chain type of interface, each card must appear unique to the LogBook or theDaq Device. This is accomplished by setting the Channel Select jumper (JP1) and the Channel Group
Select jumper (JP4) of each DBK9. JP4 selects either Upper (8-15) or Lower (0-7) channels.
No two cards in a system are to have the same channel settings.

RTD Type Selection Jumpers (JP2 and JP3)
The DBK9 was designed to measure 100 Ohm, 500 Ohm, and 1000 Ohm RTDs (all 8 RTDs must be thesame type for each DBK9). The different RTD types can be selected by changing the RTD Type jumper(JP2) and the RTD Voltage Source jumper (JP3). The default settings are shown in the figure.
JP2 and JP3 must use the same setting.

DBK9, pg. 2879895

DBK Option Cards and Modules

DBK9 Calibration
The DBK9 is default-calibrated for a 100 Ω RTD. To use theDBK9 with a 500 Ω or a 1000 Ω RTD, the user must calibrate
the card as follows:
1.

Purchase the resistors above for the given RTD type.

2.

Measure the resistor with a reliable meter, and record theexact value.

3.

Refer to the charts, and match up the proper temperature
with the measured Resistance.

4.

Connect the resistor to Channel 0 on the DBK9.

5.

Run DaqCal from the Windows support for DBK9.

6.

Adjust RP1 for the temperature that was found in thecharts.

7.

After the temperature is matched, the DBK9 is calibrated.

8.

Repeat this procedure to use a different RTD type.

RTD TypeRequired Resistor*100 Ω374 Ω, 1.0%
500 Ω
1870 Ω, 1.0%1000 Ω3740 Ω, 1.0%
* These resistors are theoreticalvalues that correspond to 795°C.

Note: Be sure JP2 & JP3
settings are correct for the RTD
type that is being calibrated.

DaqBook/100 Series & /200 Series and DaqBoard [ISA type] Configuration
Use of the DBK9 expansion card with
DaqBooks/100 Series & /200 Series andDaqBoards [ISA type] requires three jumpersettings.
1. If not using auxiliary power, place the JP1jumper in the expanded analog mode.
Note: This default position is necessary topower the interface circuitry of theDaqBook/DaqBoard Jumpers for the DBK9
DBK9 via the internal ±15 VDC power
supply. If using auxiliary power cards
DBK32A or DBK33, you must remove both JP1 jumpers. Refer to Power Requirements in theDBK Basics section and to the DBK32A and DBK33 sections of the manual for more information.
2.

For DaqBook/100, DaqBook /112, and DaqBook /120 only, place the JP3 jumper in Bipolar mode.

3.

For DaqBook/100, DaqBook /112, and DaqBook /120 only, place the JP4 jumper in Single-EndedMode.

DaqBook/2000 Series & DaqBoard/2000 Series Configuration
No jumper configurations are required for these /2000 series devices.

Software Setup
Reference Notes:
o DaqView users - Refer to chapter 2, DBK Setup in DaqView.
o LogView users - Refer to the chapter 3, DBK Setup in LogView.

DBK Option Cards and Modules

879895

DBK9, pg. 3

DBK9 – Specifications
Name/Function: 8-Channel RTD Measurement Card
Connector: DB37 male, mates with P1 pinout; screw terminals for signal connections
Configurations: 3-wire or 4-wire
Alpha: 0.00385
Inputs: 8 channels
Temperature Ranges: -200 to +850°C
RTD Excitation Current:
100 Ω500 µA

500 Ω227 µA

1000 Ω

160 µA

Accuracy: ±1.5°C (wide band)
Resolution: 0.3°C
Range and RTD Type Adjustments: Jumpers on circuit board

DBK9, pg. 4879895

DBK Option Cards and Modules