Model 706 & 766
 These instruments are full featured current conditioner/readouts; the Model 706 handles one and the Model 766 handles two transmitters (2 or 4 wire) or current sources. Both provide fast, accurate data for each input. Twenty (20) useful processing functions and real-time digital calculations make the Model 706/766 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.
Features
- 2000 Samples/Sec./Channel
- Built-in Ranges of 4-20 mA, 12±8 mA, 0±10 mA and 0±20 mA
- 1 millisecond response for speed, flow or velocity input
- 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
- Protected Excitation Supplies
- 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
Compatibility
These instruments are compatible with virtually any transmitter or current source. They are particularly well suited for torque transmitters, pressure transmitters, or current sensors.
They are compatible with Himmelstein 2 Wire Torque Transmitters: MCRT 3900X Series, Please consult factory for verification of compatibility.
Specifications
| Current Input |
May be used either differentially/floating or single ended. |
| Ranges |
4-20mA, 12±8mA, 0±10mA, or 0±20mA selectable from the keypad or remotely |
| Overrange Capability |
50% of full scale. |
| Input Protection |
±130VDC or 130Vrms at each input to ground. Differential inputs protected by 62mA fuse. |
| Input Impedance |
100 OhmΩ differential, 200k from negative input to ground. |
| Calibration |
Absolute calibration is automatic when current range is selected. |
| 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 Ratio |
with 1/10/100/200Hz filters 86/80/72/66dB. |
| Common Mode Rejection Ratio |
>80dB DC to 10MHz. |
| Resolution |
0.01% of F.S. |
| Overall Accuracy (at 77oF/25oC) |
0.02% of full scale typical, 0.03% 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 |
2,000ft. |
| 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 OR’d 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.
Eight User-defined Patterns: Patterns of Logic inputs, outputs and Matrix signals drive Logic outputs and internal Matrix signals.
State Machine Capability: User enabled/disabled. Permits up to eight states and allows event driven testing. See AN7000 for details. |
| 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 47kΩ pull-up. Input current is -100µA @ 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).
120ohm 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/O’s: Use a 9 pin D connector. They are ±15kV ESD protected and float (100kohm) 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. |
| Dual Analog Outputs |
(each assignable to any of the displayed channels)
Output Impedance/Minimum Load Resistance: <1ohm/10kohm.
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. |
| Notes: |
1. The ratio expressed in decibels (dB), of Full Scale signal to noise spread. Measurements are made for a 1 minute interval using a 100 ohm source impedance.
2. Both excitation voltages can be used simultaneously with the following restrictions: 4.8 x (12V current) + (5V Current) =< 700 mA AND 12V current =< 125 mA AND 5V current =< 250 mA.
3. Option MA converts voltage output to 4-20mA or 12±8mA current output(s). See Bulletin 389-1 for complete details.
4. Specification is subject to change without notice. |
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