These instruments are full featured voltage conditioner/readouts; the Model 723 handles one high level dc voltage input and one pulse input. A third included math channel calculates horsepower. Twenty (20) useful processing functions and 26 real-time digital calculations make the Model 723 powerful production and performance test analyzers with easily configured characteristics.
A two line alphanumeric display publishes measured and computed data, units of measure and test status. Transducer calibration is automatic, requiring no manual adjustments.
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.
DCVA (Model 3) DC Voltage Input Module
May be used either differentially or single ended.
±1V to ±10V. Maximum allowable (no damage) input is ±130VDC or 130Vrms.
50% of full scale.
Zero Control Range
±10% of full scale (F.S.) with 50% overrange and ±60% of full scale with 0% overrange.
2MΩ differential, 1MΩ single ended.
Dual polarity calibration with engineering unit scaling.
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.
with 1/10/100/200Hz filters 86/80/72/66dB.
Common Mode Rejection Ratio
>80dB DC to 10MHz.
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); Span: ±0.001% of F.S./°F (max).
+15V@100mA and +5V@250mA short circuit (current limit) and overvoltage (fuses) protected.
Maximum Transducer Cable Length
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