Measurement Computing WBK40 - Manual (Page 31)

Additional Specifications for WBK41
In addition to the preceding specifications, the following apply to WBK41. They do not apply to WBK40.
Power Out (accessed from front panel Terminal Block connectors):
+15V @ 500 mA; -15 VDC @ 500 mA; +5VDC @ 1000 mA
WBK41 includes a Power Terminal Block on the front panel. When used, it draws from the total power
available to P1. The terminal block is not used to power DBK84 modules, but is for general use.
Note that the P1 connector, located on the rear panel, supplies power to up to eight DBK84 modules.
For applications with 9 to 15 DBK84 options, a DBK32A must be added to the system.
Analog Output (accessed from Terminal Block Connectors, if the optional DBK46 is installed)
Providing that the DBK46 factory-install has been made, four analog output channels can be updated
synchronously relative to scanned inputs, or clocked from either an internal onboard clock, or an
external clock source. Analog outputs can also be updated asynchronously, independent of any other
scanning in the system.
Channels: 4 (DAC0, DAC1, DAC2, and DAC3)
Resolution: 16 bits
Data Buffer: 256 Ksample
Output Voltage Range: ±10V
Output Current: ±10 mA
Offset Error: ±0.0045V max
Gain Error: ±0.01%
Update Rate: 100 kHz max, 1.5 Hz min (no minimum with external clock)
Settling Time: 10 µsec max to 1 LSB for full-scale step
Digital Feed-thru: a spike of up to 50 mV may occur on the DAC output each time that the
DAC output is updated.
Clock Sources: 4, programmable
1. Onboard D/A clock, independent of scanning input clock
2. Onboard scanning input clock
3. External D/A input clock, independent of external scanning input clock
Digital I/O (16 Channels accessed from front panel Terminal Block Connectors, 24 channels accessed from the
DB37 P2 connector on the on rear panel):
Channels: 40, expandable up to 272 with external digital DBK options
Input Scanning Modes: 2
1. Asynchronous, under program control at anytime relative to input scanning
2. Synchronous with input scanning
Ports: 3 x 8-bit from the rear panel DB37 (P2) connector; and 1 x 16-bit (front panel screw terminal);
each port is programmable as input or output
I/O Levels: TTL
Sampling/Update Rate: 200 kHz max
P2 – Digital I/O Characteristics:
Output Driver:
Resistor & Pull-up: 33
Ω series resistor with a 680 Ω pull-up to 5 V
Current: can only sink current, source-current from pull-up resistor
Output Voltage:
High Level: 2.0 V min @ 4 mA; 4.0 V min @ 1 mA
Low Level: 0.5 V min @ 4 mA
Input Voltage: valid range of - 0.3 V to + 5.0 V
Note: Specifications are subject to change without notice.
Thermocouple & Multifunctional Modules 926896 WBK40 & WBK41, pg. 31