Products > Signal Conditioning Systems > Model 9355 Automated Amplifiers > Model 9355  
Download PDF Download PDF     Printable Page     Email Email This Page     Save To Favorites Save To Favorites

Model 9355, Modular High-Performance Instrumentation Amplifier


  • Voltage & current excitation
  • Remote sensing & excitation interrupt
  • Two-range automatic balance
  • DAC shunt calibration
  • 4-step, bipolar resistive shunt calibration
  • Gains 1 to 10,000
  • Voltage substitution calibration
  • 300 Volt common mode
  • Eight low-pass filters, dual outputs
  • Digital excitation & output monitors
  • Windows software


Series 9300 are fully programmable, modular signal conditioning amplifiers for use with transducers and other low-level signal sources. An on-board microprocessor automates operation, reducing setup time and assuring high-quality measurement data. Programming and control are by IEEE-488 interface using a high-level programming language or Windows software. The optional control panel enables setting and display of operating parameters locally with display of excitation voltage and current and amplifier output.

The 9355 is a transducer amplifier with a guarded 2 to 10 wire input. It has bridge completion, programmable constant voltage and constant current excitation with remote sensing and excitation interrupt, automatic balance, shunt calibration, programmable gain instrumentation amplifier and programmable filter. DAC controlled shunt calibration with 4096 steps is standard and 4-step, bipolar double resistive shunt is optional.

Within the 9355, bridge completion and calibration components mount on a plug-in, front panel installed completion card that has a holder for channel identification data. Switches on the completion card set transducer specific operating parameters and identification. Completion cards are available for special requirements such as dynamic strain, 28 Volt excitation, voltage-mode charge, input attenuation and many other standard and customer-specific applications.

Gain is programmable from 1 to 10,000 with 0.05% resolution and 32 preset steps. Ten gain steps are factory calibrated providing ±0.1% accuracy. The remaining gain steps may be user calibrated or employed as variable gains for engineering units calibration. The amplifier operates from grounded or floating sources providing 120-dB rejection for common mode voltages to ±300 Volts.

Buffered Data and Tape outputs supply ±10 Volts full scale. Each output may be selected for wideband or filtered response. The standard filter is a four-pole, Bessel low-pass with eight programmable bandwidths and wideband. Output and excitation can be read over the computer interface and on the optional control panel. The control panel sets and displays excitation, gain and filter; controls balance, zero, calibration and input modes and displays the output and excitation voltage or current level.

Channels may be programmed individually or as a group using IEEE-488 or RS232. Adapters are available for Ethernet. Programmed operating parameters are kept in non-volatile memory and are automatically restored when the system is powered up or reset. PACWin93 control and display software is optionally available for operation under Windows 2000/XP. User programming is supported by a high-level instruction set and National Instruments LabView driver. PI660 software includes a feature for programming the 9355s when used as the front end for Pacific’s Series 6000 data acquisition system.

Ten channels, each with integral isolated power supply, mount in a 7-inch high rack enclosure. Multiple enclosures can accommodate up to 160 channels on each bus address. Interface adapters are available for Ethernet and USB 2.0.

Input  · Voltage Excitation / Transducer Power  · Current Excitation / Transducer Power  · Amplifier  · Filter  · Calibration  · Mechanical  · Ordering Information   · Signal Conditioning  · Control Panel (Option)  · PACWIN93 Software  · User Written Software



2 to 7 wires (10 wires with C4) plus shield. Input components mount on plug-in completion card inserted through the front panel with holder for channel identification.

Input Stability

±50 ppm/ºC

Bridge Balance

Automatic by program command. Balance is digitally stored in non-volatile memory to retain setting when power is off. All outputs programmed to zero during balancing operation.

Balance Range

Range resistors mounted in bifurcated terminals on the completion card. Shipped with 2.5 mV/V and 16 mV/V balance ranges for 350 Ohm bridge.

Balance Resolution

0.025 %

Balance Accuracy

±0.05% of range, ±2 mV RTO

Balance Disable

Balance can be removed by program command without changing the setting.


Components mount in bifurcated terminals on completion card. Switches select local or remote sense and excitation voltage or current for front panel monitor.

Transducer I.D.

Eight switches on the completion card are for entry of a transducer specific identification code. Switches select one of 32 programmed sets of default operating parameters.

AC/DC Coupled

Programmable AC/DC coupled input. Lower frequency response in AC coupled mode is -3dB at 1.6 Hz.

Voltage Excitation / Transducer Power

Voltage Excitation

Programmable from 0.5 to 15 Volts (limited to 25 Volts) with 10 mV resolution. 32 Excitation steps. 15 Steps: 1,2,3,4....,15 Volts are factory calibrated within ±0.2%. 100 mA limited to 140 mA.

Voltage Excitation Regulation

±0.01% or ±200 µV for 10% line change or no load to full load.

Voltage Excitation Stability

±0.01% or ±500 µV for 8 hours.

Voltage Excitation Noise

100 µV plus 0.001% peak-to-peak (0.1 Hz to 20 kHz).

Temperature Coefficient (Voltage Excitation/Transducer Power)

±0.005% or ±100 µV/ºC

Response (Voltage Excitation/Transducer Power)

5 µS to ±0.1% for no load to full load.


10,000 Megohms shunted by 1 pF to power and rack grounds.

Voltage Excitation Sense

Switch on completion card selects local or remote sensing in voltage excitation mode. Full output is supplied at the transducer with up to 1 Volt line drop. Reverts to local sense mode if sense leads disconnected. Sense Current is 10 µA maximum.

Voltage Monitor

Terminals on the front panel measure excitation. Voltage or current monitor is selected by a switch on the completion card. Also, Excitation level is displayed on the control panel and returned by program command. Analog representation of the excitation level is present on the data outputs during execution of the program command.

Current Excitation / Transducer Power

Current Excitation

Programmable 1 mA to 100 mA (limited to 25 Volts) with 50 µA resolution. 32 Excitation steps. Ten steps: 10, 20, 30....100 mA are factory calibrated to ±0.2% accuracy.


0.1 to 15 V

Current Regulation

±0.01% or ±0.1 µA for 10% line change.

Current Excitation Stability

±0.01% or ±2 µA for 8 hours.

Current Excitation Noise

1 µA or 5 µV peak-to-peak (0.1 Hz to 20 kHz)

Temperature Coefficient (Current Excitation/Transducer Power)

±0.005% or ±1 µA/ºC.

Response (Current Excitation/Transducer Power)

50 µS to ±0.1% for 10% load change

Current Monitor

Terminals on the front panel measure excitation. Voltage or current monitor is selected by a switch on the completion card. Also, Excitation level is displayed on the control panel and returned by program command. Analog representation of the excitation level is present on the data outputs during execution of the program command.



1 to 10,000 with 0.05% resolution. Ten factory calibrated gains with ±0.1% accuracy: 1, 2, 5, 10, 20, 50, 100, 200, 500, and 1000. Total of 32 gain steps, 10 of which are preset at factory. Balance may be programmed by user.

Gain Stability

±0.02% for six months. Temperature coefficient is ±0.004%/ºC maximum.

Gain Linearity

±0.01 %

Input Impedance

50 Megohms shunted by 200 pF (100K Ohms when AC Coupling is enabled - Option P only).

Input Protection

±50 Volts differential, and ±350 Volts common mode.

Common Mode

120 dB DC to 60 Hz for gain 1,000 and above. At lower gains, CMR is 63 dB plus gain in dB. CMR decreases at a rate not exceeding 6 dB/octave from the specified value at 60 Hz. (350 Ohm source unbalance).

CM Voltage

±300 Volts DC or peak AC operating.

Zero (Amplifier)

Automatic zero to ±1 µV RTI or ±0.5 mV RTO whichever is greater at power up and change of gain or filter setting.

Zero Stability

±5 µV RTI, ±0.5 mV RTO at constant temperature. Temperature coefficient is ±1 µV/ºC RTI and ±0.15 mV/ºC RTO. Zero shift for any gain or filter setting is less than ±2 mV RTO.

Source Current

±1 nA, ±0.5 nA/ºC

Noise (10 Hz)

1 µV RTI plus 0.5 mV RTO, peak (350 Ohm source or bridge).

Noise (10 kHz)

2 µV RTI plus 0.3 mV RTO, RMS (350 Ohm source or bridge).

Noise (100 kHz)

4 µV RTI plus 0.6 mV RTO, RMS (350 Ohm source or bridge).


100 kHz (-3dB) for all gains to 1,000. Bandwidth decreases proportional to gain above 1,000.

Slew Rate

6 V/µS

Settling Time

75 µS to within ±0.1% final value.

Overload Recovery

100 µS to within ±0.1% for a 10 times overload to ±10 Volts.

Overload Indication

Latched status flag set and front panel LED illuminated when output exceeds ±10.5 Volts. LED is illuminated for 500 mS or duration of overload, whichever is longer. Status flag reset by program command.

Analog Output (Amplifier)

±10 Volts at 10 mA. Output impedance less than 1 Ohm.
Tape Output: ±10 Volts at 10 mA. Output impedance less than 1 Ohm.
Monitor (Analog): Terminals on the front panel for data output.
Monitor (Digital): Output voltage displayed on control panel and returned by program command.
Bandwidth: Jumper selected wideband or filtered response for each output.
Protection: Protected against continuous short. No instability with capacitive loads to 0.22 µF.
Output Isolation: Less than 100 nA RMS leakage to power or rack ground at 60 Hz line frequency.



Four-pole Bessel (24 dB/octave) low pass filter.


Programmable bandwidths of 10 Hz, 30 Hz, 100 Hz, 300 Hz, 1 kHz, 3 kHz, 10 kHz, 30 kHz, and wideband.


Other filter characteristics and cut offs are available.



DAC: DAC controlled shunt calibration providing 4096 levels with selectable range.
Resistive: Four-step resistive, bipolar, double shunt calibration with 10-wire input. Zero-force, plug-in resistor card, calibration resistors not included.

Voltage Substitution

Program instruction selects alternate calibration input to the differential amplifier for application of an external calibration signal.

Zero Calibration

Amplifier output is automatically set to zero. Performed at power up and gain or filter setting change.


Control Panel

Monitor mode: Four-digit display is menu selected to indicate gain, filter frequency, excitation or output and calibration state.
Program mode: Menu selection of all operating parameters and modes. Three switches provide up and down menu or parameter selection and enter.
LED indicators: Indicate status of calibration, overload and power.


The interface coupler is installed in the Master rack enclosure for program control using IEEE-488 or RS232 protocols. The instruction has the format of a command followed by multiple parameters. All programmed operating parameters and calibration status can be read back by program command.

Rack Enclosures

Enclosures for 19-inch wide RETMA rack mounting hold ten transducer amplifiers using 7-inches of panel height. Depth is 26-inches. The initial ten channels require a Master enclosure which provides the IEEE-488 & RS232 interfaces. Subsequent channels, up to 160 total, mount in Slave enclosures that are provided with interconnecting cables to the Master enclosure. Input, output, interface, and power connectors are mounted on the rear panel. Rack enclosure frame is connected to power ground. A screw fastener secures each channel. 120 or 230 VAC, ±10%, 47 to 400 Hz, 15 Watts. Panel indicator is illuminated when power is on and interface is enabled.


Input: R93-010 has 15-pin, 1/4 turn twist lock MS 3102 style input connectors.
Mating connectors are supplied.
Output: Isolated BNC, 2 per channel.

Operating Temperature

0 to +50 ºC

Storage Temperature

-25 to +71 ºC


Up to 95% without condensation.


7 in


1.63 in


17.75 in


5 lb

Ordering Information 

Ordering Information

9355Q - Transducer Amplifier-Filter with Control & Display Panel

9355QS4 - Transducer Amplifier-Filter with Control & Display Panel, Four-Step Double Shunt Calibration.

R93-010-M - 10-Channel Master Enclosure, IEEE-488/RS232 interface, MS Input Connectors.

R93-010-S - 10-Channel Slave Enclosure, MS Input Connectors.

9300-020 - Bridge Completion Card (Standard)

9300-021-01 - Low Impedance Charge Completion Card

9300-021-03 - 100:1 Balanced Attenuator Completion Card

9300-021-04 - Voltage Completion Card

9300-021-05 - Bridge, Single Shunt Cal Completion Card

9300-021-06 - Voltage, AC Coupled Completion Card

9300-035 - Transducer Amplifier

9300-036 - Transducer Amplifier

9300-090 - Bench Service Fixture

FM3A - Fan Assembly, 115 VAC

AMP93 - Maintenance Software

PACWin93A - Operating Software

Signal Conditioning
  • Input configuration determined by plug-in completion card, no rewiring to change gage types
  • Versatile 2 to 10-wire shielded input handles all gages
  • Line powered - isolated excitation and outputs
  • Programmable voltage or current excitation, 0.01% stability
  • Remote sensing improves accuracy by regulating excitation at the gage
  • Automatic voltage-injection balance does not decrease input range even for large unbalances
  • Software enabled automatic calibration using voltage substitution and/or shunt. Four-step shunt using zero force plug-in resistor card is optionally available
  • Gains from 1 to 10,000 in calibrated steps or user selected with 0.05% resolution
  • Four-pole Bessel low-pass filter with eight programmable bandwidths from 10 Hz to 30 kHz and wideband (100 kHz)
    Other filter choices available
  • IEEE-488 & RS232 interfaces for programming and control of up to 160 channels

Control Panel (Option)
  • Program and display gain, filter frequency, excitation and calibration mode
  • Monitors amplifier output, excitation voltage and current
  • Menu buttons select and move up or down through menus on bright LED display. Enter button selects submenus and enters parameter values
  • Displays channel number, error messages and user programmed alphanumeric messages

PACWIN93 Software
  • Ready-to-run, Windows 2000/XP compatible, no user programming required
  • Program channels by selecting them from a transducer database that contains the operating parameters
  • Use Channel Specification window to view and change channel programming
  • Monitor output, excitation voltage or current on scrolling strip chart and tabular windows

User Written Software
  • High-level resident instruction set, National Instruments LabView driver
  • Operating parameters and status can be read back for setting verification


Model 9355
(PDF, 268KB)

© 2015, Pacific Instruments, Inc. Catalog IndexPrivacy PolicySite Map