Voltage Conditioners

1550 Kingston Rd. #1116
Pickering, ON
L1V 6W9
TEL: 1 800 809 7167 CDA/USA
Load Cells/Transducers
Pressure Sensors
Torquemeter/Torque Sensor
Vibration/Shock Monitors
Voltage Conditioners  

Model 703 & 733

These instruments are full featured voltage conditioner/readouts; the Model 703 handles one and the Model 733 handles two inputs. Both provide fast, accurate data for each input. Twenty (20) useful processing functions and 26 real-time digital calculations make the Model 703/733 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.


  • 2000 Samples/Sec./Channel
  • ±1V to ±10V Inputs Protected To 130Vrms
  • Accepts Differential Or Single Ended Inputs
  • 6 Digit Engineering Unit Display With Legends And 0.01% Resolution
  • Real-Time Cross Channel Calculations And Math Operations
  • 20 Built-In Data Acquisition And Control Functions
  • Includes Protected 15V And 5V Sensor Excitation
  • RS232, RS422 Or RS485 Serial Communication
  • User Assignable Logic Inputs And Outputs
  • Auto-Scaled ?5v And/Or ?10v Analog Outputs
  • No Manual Adjustments, No Batteries, No Fans, No Maintenance
  • CE Marked


These instruments are compatible with virtually dc voltage output sensor. They are particularly well suited for DC operated torquemeters, DC LVDT's, Watts, vars, current, voltage and potentiometric sensors.

They are compatible with Himmelstein DC Operated Torquemeter Models: MCRT 4800V Series, MCRT 48000V Series MCRT 4900V Series, MCRT 49000V Series MCRT 27000V Series Wheel Torquemeters. Please consult factory for verification of compatibility.


Voltage Input

May be used either differentially or single ended.


1V to 10V. Maximum allowable (no damage) input is 130VDC or 130Vrms.

Overrange Capability

50% of full scale.

Zero Control Range

10% of full scale (F.S.) with 50% overrange and 60% of full scale with 0% overrange.

Input Impedance

2M!& differential, 1M!& single ended.


Dual polarity calibration with engineering unit scaling.

Antialias Filter

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.

Signal-to-Noise Ratio1

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 77oF/25oC)

0.01% of full scale typical, 0.02% of full scale, worst case.

Temperature Effects

Zero: 0.001% of F.S./ oF (max); Span: 0.001% of F.S./ oF (max).

Maximum Cable Length


System Display

Type: 2 line by 16 alphanumeric characters, each 0.2" wide by 0.3" high. Backlit LCD with adjustable contrast.
Views: Select either 2 Channels, 1 Channel with Limit Status, or 1 Channel with I/O Status.
Data Displayed: Select from Current, Max, Min, Spread, Held data and Tare value.
Data Format: Engineering units with 6 digits (1-2-5 format) and 5 character 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.

System Control

(All I/O functions can be ORd in any combination. The pattern function adds ANDing capabilities.)

Input Actions/channel: 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.
Output Events/channel: 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.

Limit Checking

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 function -- destination)

Type: TTL compatible, Schmitt Trigger, low-true with 47k.© pull-up. Input current is -100A @ 0V.
Protection: to 130VDC (or 130Vrms).

Six Logic Outputs

(each with programmable function -- source)

Type: Open collector, low-true. Operating @ 24V (max) and 0.3A max sink current.
Protection: Short circuit (current and thermal limits) and overvoltage (0.5A fuse).

External +5VDC Power (on I/O connector)

250mA, short circuit (current limit) and overvoltage (fuse) protected.

Serial Communication Port

(user selectable as RS232, RS422, or RS485)

BAUD Rate: 300 to 38400. Maximum Cable Length: 4000ft (RS422/RS485), 50ft (RS232).
Maximum Number of Devices: 32 (RS485), 1 (RS232/422).
120.© Termination Resistors (RS485): user selectable for RXD and TXD.
RS422/485 Transceivers: Slew-rate limited, short circuit protected (current & thermal limits).
RS232 Drivers: Short circuit protected (current limit).
Serial I/Os: Use a 9 pin D connector. They are 15kV ESD protected and float (100k.©) with respect to Earth Ground.
Commands: Control of all modes, settings, and measurements.

Non-Volatile Memory Storage for System Settings

EEPROM, batteries are not used.

External +5VDC Power

(on I/O connector) 250mA, short circuit (current limit) and overvoltage (1A fuse) protected.

Dual Analog Outputs

(each assignable to any of the displayed channels)

Output Impedance/Minimum Load Resistance: <1.©/10k.©.
Full Scale: 5V or 10V (user selectable). Resolution is 2mV @ 5V FS or 4mV @ 10V FS.
Overrange: 8.2V @ 5V FS or 13.5V @ 10V FS.
Non-linearity: 2mV @ 5V FS or 4mV @ 10V FS.
Overall Error (worst case, including temperature effects): 5mV @ 5V FS or 10mV @ 10V FS.
Filter: 100Hz, 5 pole Bessel response low pass filter.
Protection: Short circuit (current limit) and overvoltage (0.25A fuse) protected.

Size and Weight

6.5" wide, 2.9" high, 8.7" deep. Weight is 3 pounds.

Operating Temperature

+41oF to +122oF (+5oC to +50oC).

Input Power

90VAC to 250VAC, 50/60Hz @ 25VA, max. Two 2A/250V fuses, line filter, and rear power switch.


1. The ratio expressed in decibels (dB), of Full Scale to noise spread. Measurements are made for a 1 minute interval using a 350.© bridge.

2. Both excitation voltages can be used simultaneously with the following restrictions: 6 x (15V current) + (5V Current) "d 700 mA AND 15V current "d 100 mA AND 5V current "d 250 mA. The Model 733 has two pairs of these supplies.

3. Specification is subject to change without notice.

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