These advanced instruments provide engineering unit display of a dc strain gage (mV/V) input and a frequency input. They also compute power and perform 21 functions including limit checks, tare, hold, and max/min capture. You needn't write code or add hardware to be up-and-running a productive test.
The two line alphanumeric readout displays measured and computed data, units of measure and test status. Transducer calibrations are fully automatic, requiring no manual adjustments.
DCSA (Model 8) DC Strain Gage Amplifier
Strain Gage Input
Any 80Ω to 2kΩ with 5V excitation, 170Ω to 2kΩ with 10V excitation.
5V or 10V DC, user selected. Regulated, and short circuit protected.
1 to 4.5mV/V with 50% overrange; automatically scaled.
Maximum Cable Length
Automatic Zero Range
±10% of Full Scale (with 50% overrange), ±60% of Full Scale (with 0% overrange). .
Shunt and Load Type
Dual polarity shunt calibration with provision for CAL resistor feedback.
±1 mV/V to ±4.5 mV/V. Absolute accuracy is ±0.01% typical, ±0.02% worst case
Spurious Signal Rejection
130dB for 60Hz common mode signal.
200Hz, 5 pole Bessel response filter.
Low Pass Filtering
4 pole Bessel response digital filter with 11 cutoff frequencies from 0.1 to 200Hz in 1-2-5 steps.
@ 1mV/V F.S. and 5V Excitation: 80/70/59/56dB with 1/10/100/200Hz filters.
0.01% of F.S.
Overall Accuracy (at 77°F/25°C)
0.01% of Full Scale typical; 0.02% of Full Scale, worst case.
Zero: ±0.001% of F.S./ °F (max);
CTUA (Model 2) Frequency Input Module
Any uni-directional or bi-directional (quadrature) source including self generating and zero velocity magnetic pickups, optical encoders, flowmeters, etc. When used with bi-directional sensors, the conditioner outputs both direction and magnitude.
Input Threshold (keypad selectable)
10, 20, 50, 100, or 200mVpk-pk (between inputs) or TTL.
±130VDC or 130Vrms.
Input Signal Bandwidth
0.001 to 200kHz (10 to 200mV pk-pk threshold), 0.001 to 400kHz (TTL threshold).
Display Ranges and Resolution
Rangeless (use any F.S. Engineering Unit value) with 50% overrange. Resolution is 0.01% of F.S.
Low Pass Filter (keypad selectable)
20kHz (-3dB) or none. This filter is not available for TTL inputs.
Greater of: 1 ms, typical (2 ms worst case) or the input pulse length.
Common Mode Rejection
80dB (60Hz), 55dB (0 to 10kHz).
Low Pass Filtering of Sampled Data
Unfiltered or 4 pole Bessel filter. Cutoff frequencies from 0.1 to 100 Hz in 1-2-5 steps.
0.01% of F.S. @ +77°F (+25°C), 0.015% of F.S. @ +41°F to +122°F (+5°C to +50°C).
+12V@125mA2 or +5V@250mA2. short circuit (current limit) and overvoltage (fuses) protected.
General System Specifications
2 line by 16 alphanumeric characters, each 0.2" wide by 0.3" high. Backlit LCD with adjustable contrast.
Select either 2 Channels, 1 Channel with Limit Status, or 1 Channel with I/O Status.
Select from Current, Max, Min, Spread, Held data and Tare value.
Engineering units with 6 digits (1-2-5 format) and 5 character, upper or lower case, user-entered legend/descriptor.
System Response (per channel)
Data Sampling & Max/Min Update Rates: 2000Hz (hardware channels), 50Hz (CH3 calculation).
Limit Checking Rate: 1000Hz (hardware channels), 50Hz (CH3 calculation).
Logic I/O Response Time: 1ms (hardware channels), 20ms (CH3 calculation).
Update Rate for Each Analog Output: 1000Hz.
All I/O functions can be OR’d in any combination. The pattern function adds ANDing capabilities.
Logic inputs, outputs, and internal Matrix signals control following actions. Tare, Clear Tare, Hold, Clear Hold, Reset Max/Min, Clear Latched Limits, Check Limits, Do Max/Mins, Apply +CAL, Apply -CAL.
The following events drive Logic outputs and internal Matrix signals. HI Limit, NOT HI Limit, IN Limit, NOT IN Limit, LO Limit, NOT LO Limit, At Max, NOT At Max, At Min, NOT At Min.
Three User-defined Patterns
Patterns of Logic inputs, outputs and Matrix signals drive Logic outputs and internal Matrix signals.
Each channel has a HI and LO limit which may be latched or unlatched, absolute or signed, and with or without hysteresis. Select either Current, Max, Min, Spread or Held data for limit checking. Limit violations on any or all channels can be set to trigger backlight flashing in any of the display view modes.
Four Logic Inputs
Each with programmable destination, protected to ±130VDC or 130Vrms.
TTL compatible, Schmitt Trigger, low-true with 47kΩ pull-up. Input current is -100μA @ 0V.
Six Logic Outputs
Each with programmable source, short circuit (current and thermal limits) and overvoltage (fuse) protected.
Open collector, low-true. Operating @ 24V (max) and 0.3A max sink current.
External +5VDC Power (on I/O connector)
250mA, short circuit (current limit) and overvoltage (fuse) protected.
Serial Communication Port
(selectable as RS232, RS422, or RS485. Supports 32 devices on RS485 port and 1 device on RS232/422)
300 to 38400. Maximum Cable Length: 4000ft (RS422/RS485), 50ft (RS232).
120Ω Termination Resistors (RS485)
user selectable for RXD and TXD.
Slew-rate limited, short circuit protected (current & thermal limits).
Short circuit protected (current limit).
Use a 9 pin D connector. They are ±15kV ESD protected and float (100kΩ) with respect to Earth Ground.
Size and Weight
6.5" wide, 2.9" high, 8.7" deep. Weight is 3 pounds.
+41°F to +122°F (+5°C to +50°C).
90VAC to 250VAC, 50/60Hz @ 25VA, max. Two 2A/250V fuses, line filter, and rear power switch.Option 12D1 converts from AC line power to 10 to 15VDC operation @ 15 Watts, max. It includes a rear power switch, fuse & filter.
1. The ratio expressed in decibels (dB), of Full Scale to noise spread. Measurements are made for a 1 minute interval using a 350Ω bridge.
2. Both excitation voltages can be used simultaneously with the following restrictions: 4.8 x (12V current) + (5V current) ≤700mA AND 12V current ≤ 125mA AND 5V current ≤ 250mA