DI-8B45 Frequency Input Modules
FEATURES
SPECIFICATIONS
Typical at T = +25ºC and +5V Power
A
• Accepts Frequency Input Signals 0 to
100kHz
DI-8B45
Input Range
0Hz to 100kHz
• TTL or Zero-Crossing Signal Inputs
• High Level Voltage Outputs
Input Threshold
Zero Crossing
200mVp-p
Minimum Input
Maximum Input
Minimum Pulse Width
TTL Input Low
350Vp-p TTL, 170Vp-p Zero Crossing
• 1500Vrms Transformer Isolation
4µs
0.8V max
2.4V min
• ANSI/IEEE C37.90.1 Transient Pro-
tection
TTL Input High
• Input Protected up to 240VAC Con-
tinuous
Input Hysteresis
Zero Crossing
TTL
±50mV
1.5V
• 100dB CMR
Input Resistance
Input Protection
• 70dB NMR at 60Hz
• ±0.10% Accuracy
Normal
Power Off
Overload
200kΩ
200kΩ
200kΩ
• ±0.05% Linearity
• Low Drift with Ambient Temperature
Continuous¹
Transient
240Vrms max
ANSI/IEEE C37.90.1
• UL, CSA, FM and CE Certifications
Pending
Excitation
+5V at 8mA max
• Mix and Match Module Types
CMV, Input to Output
Continuous
Transient
1500Vrms max
ANSI/IEEE C37.90.1
DESCRIPTION
DI-8B modules are an optimal solution
for monitoring real-world process signals
and providing high level signals to a data
acquisition system. Each DI-8B45 module
isolates and conditions a frequency input
signal and provides an analog voltage
output.
CMR (50Hz or 60Hz)
Accuracy²
100dB
±0.10% Span
±0.05% Span
Nonlinearity
Stability
Offset
Gain
±25ppm/ºC
±100ppm/ºC
The frequency input signal can be either
a TTL level or zero crossing with as little
as ±100mV amplitude. Input circuitry for
each signal type has built-in hysteresis to
prevent spurious noise from corrupting the
module output. TTL signals are applied to
the + and - terminals while zero crossing
signals are applied to the +EXC and - ter-
minals. Reference the block diagram (p 2).
A 5V excitation is available for use with
magnetic pick-up or contact closure type
sensors. The excitation is available on the -
EXC terminal with return on the - terminal.
A special input circuit on the DI-8B45
modules provides protection against ac-
cidental connection of power-line voltages
up to 240VAC. Clamp circuits on the I/O
and power terminals protect against harm-
ful transients.
Noise
Output Ripple
<10mVp-p at Input >2% Span
Response Time, 90% Span
300ms (-01); 175ms (-02); 50ms (-03);
30ms (-04); 30ms (-05); 15ms (-06);
15ms (-07); 2ms (-08)
Output Range
0 to +5V
Output Protection
Continuous Short to Ground
ANSI/IEEE C37.90.1
Transient
Power Supply Voltage
Power Supply Current
Power Supply Sensitivity
Mechanical Dimensions
+5VDC ±5%
110mA
±50ppm/%
1.11" × 1.65" × 0.40"
(28.1mm × 41.9mm × 10.2mm)
Environmental
Operating Temperature
Storage Temperature
Relative Humidity
-40ºC to +85ºC
-40ºC to +85ºC
0 to 95% Noncondensing
Isolation is provided by optical coupling
to suppress transmission of common mode
spikes or surges. The module is powered
from +5VDC, ±5%.
¹240VAC between + and -/+EXC/-EXC terminals. 120VAC between - and +EXC/-
EXC terminals and between +EXC and -EXC terminals.
²Includes nonlinearity, hysteresis, and repeatability.
The modules are designed for installation
in Class I, Division 2 hazardous locations
and have a high level of immunity to envi-
ronmental noise.
DATAQ Instruments, Inc.
• 241 Springside Drive • Akron, Ohio 44333 • Tel: 330-668-1444 • Email: support@dataq.com • www.dataq.com
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