General Specifications

Strain Gage Input(s)
(directly wired)

Resistance: 80 to 2,000Ω with 5V excitation, 170 to 2,000Ω with 10V excitation.
Connections:  Provision for 4, 6, or 7 wire circuits.

Maximum Cable Length

500ft for transducer impedance >100Ω and 200ft for transducer impedance <100Ω.

Transducer Excitation

5V or 10V dc, user selected. Regulated, and short circuit protected.

Input

Sensitivity: 1 to 4.5mV/V with 50% overrange; automatically scaled.
Differential Impedance: 100MΩ.

Automatic Zero Range

±10% of Full Scale (with 50% overrange), ±60% of Full Scale (with 0% overrange).

Tare Range (tare may actuated from keypad for remotely via logic I/O or serial communication port)

±100% of Full Scale.

Auto Calibration

Shunt and Load Type:  Dual polarity with provision for CAL resistor feedback.
mV/V Type:  ±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.

Antialias Filter

200Hz, 5 pole Bessel response filter.

Low Pass Filtering

4 pole Bessel response digital filters with 11 cutoff frequencies from 0.1 to 200Hz in 1-2-5 steps.

Signal-to-Noise Ratio¹

@ 1mV/V F.S. and 5V Excitation: 80/70/59/56dB with 1/10/100/200Hz filters.
@ 1mV/V F.S. and 10V Excitation: 80/74/65/60dB with 1/10/100/200Hz filters.
@ 4.5mV/V F.S. and 5V Excitation: 86/74/68/65dB with 1/10/100/200Hz filters
@ 4.5mV/V F.S. and 10V Excitation: 86/86/74/68dB with 1/10/100/200Hz filters.

Resolution

0.01% of Full Scale.

Overall Accuracy
(at 77°F/25°C)

0.01% of Full Scale typical, 0.02% of Full Scale, worst case.

Temperature Effects

Zero: ±0.001% of Full Scale/°F (max)
Span: ±0.001% of Full Scale/°F (max).

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, upper/lower case, user-entered legend/descriptor.

Number of Channels

Hardware: Supports one (Model 708) or two input channels (Model 788).
Calculated: One (CH3). Choose from 26 formulas based on CH1, CH2, and a constant.

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.

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 outputs an 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 destination, protected to ±130VDC or 130Vrms.
Type: 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 overrange (fuse) protected.
Type: 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

(user selectable as RS232, RS422, or RS485.  Supports 32 devices on RS485 port and 1 device on RS232/422)
BAUD Rate: 300 to 38400. Maximum Cable Length: 4000ft (RS422/RS485), 50ft (RS232).
120Ω 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 (100kΩ) 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 3channels, are short circuit (current limit) and overvoltage (fuse) protected.)
Output Impedance/Minimum Load Resistance: <1Ω/10kΩ.
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

+41°F to +122°F (+5°C to +50°C).

Input Power

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.

Notes:

1. The ratio expressed in decibels (dB), of Full Scale to noise spread. Measurements are made for a 1 minute interval using a 1000Ω 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 ≤ 125mA AND 5V current ≤ 250mA.
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.