Omega Products OMB-DBK7 User Manual
⻬ Programmable from 1 Hz
to 950 kHz Per Channel
⻬ Frequency Resolution
to 0.00025 Hz
⻬ Provides Per-Channel,
User-Configurable
Low-Pass Filters
The OMB-DBK7 frequency-input
card provides OMB-LOGBOOK
and OMB-DAQBOARD-2000
Series data acquisition systems
with four channels of frequencymeasurement capability. The
card measures the input signal’s
frequency and converts the
frequency to a voltage, which
can then be measured by the
data acquisition system. The
OMB-DBK7’s output is read by the
data acquisition system along with
any other analog channels included
in the analog scan group, allowing
easy correlation of readings from
the OMB-DBK7 with other test
parameters. As many as as sixtyfour OMB-DBK7’s can be connected
to one OMB-LOGBOOK and
OMB-DAQBOARD-2000 series
acquisition system, for a total of
up to 256 channels.
Analog Inputs
The OMB-DBK7 accepts
AC-coupled analog inputs up to
80 V p-p. Each of its channels is
equipped with a low-pass input filter
that is jumper selectable for 100
kHz, 300 Hz, or 30 Hz.
OMB-DBK7
4-Channel Frequency-Input Card for
OMB-DAQBOARD-2000 Series and OMB-LOGBOOK
OMB-DBK7, 749,
frequency-input
card, shown
smaller than
actual size
The card can accommodate 1 Hz to
100 kHz measurement of signals
from 50 mV to 80 V p-p.
Digital Inputs
The OMB-DBK7’s digital inputs,
which can measure signals from
0.001 Hz to 950 kHz, feature TTL
Schmitt-trigger levels and can accept
DC-coupled signals from -15 V to
+15 V. The OMB-DBK7’s digital
inputs are equipped with
pull-up resistors for use with relays
or switches.
Frequency Range
The OMB-DBK7 provides 12-bit
resolution at any frequency from
1 Hz to 950 kHz.
Update Rates
For ranges from 1 Hz to the userdefined maximum upper range
boundary, the voltage conversion
update will occur every 2 to 4 ms
or the period of the input frequency,
whichever is greater. With a range
of 0 to 10 kHz, the OMB-DBK7 will
update every 2 to 4 ms. If the range
is 0 to 60 Hz, the output will update
every cycle or 16.6 ms.
Specifications
Connector: DB37 male, mates
with P1 connector on the
OMB-LOGBOOK and OMBDAQBOARD-2000 Series; BNC
connectors for signal inputs
Number of Channels per Card: 4
Maximum Cards per System: 64
Frequency-to-Voltage Ranges:
Programmable from 1 Hz to 950 kHz
Accuracy: 0.1%
Low-Pass Filters: 300 Hz & 30 Hz
Debouncing: off 0.6, 2.5, & 10 ms
Input Characteristics
Low-Level Analog Signals
Minimum: 100 mV guaranteed
Maximum: 80 V p-p sine wave
Minimum Slew: 5 V/s
Hysteresis: 15 mV
Impedance: AC-coupled (0.33 µF),
in series with 20 KΩ to ground
High-Level Analog Signals
Minimum: 1.25 V guaranteed
Maximum: 80 V p-p sine wave
Minimum Slew: 50 V/s
Hysteresis: 250 mV
Impedance: AC-coupled (0.33 µF),
in series with 20 KΩ to ground
Digital Signals
Input Voltage: -15 V to +15 V
Threshold Voltage (low):
0.8 V typ, 0.5 V min
Threshold Voltage (high):
1.6 V typ, 2.1 V max
Hysteresis: 400 mV min
Pulse Width: 520 ns min
Input Impedance: 27 KΩ pull-up
to +5 V in parallel with 50 pF
Power Consumption: 420 mW
Ordering Example: OMB-DBK7 4-channel frequency-input card, $749.
To Order (Specify Model Number)
Model Number Price Description
OMB-DBK7 $749 4-Channel Frequency-Input Card
H-61
Model OMB-DBK7
$
749
AVAILABLE FOR FAST DELIVERY!
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