Michigan Scientigic PS-AC-0.8 Operator's Manual

321 E. Huron Street
Milford, MI 48381
[phone]
Fax: [phone]

http://www.michsci.com
[e-mail]

PS-AC-0.8

AC Remote Amplifier Control Unit

8500 Ance Road

Charlevoix, MI 49720

[phone]

Fax: [phone]

OPERATOR’S MANUAL

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rev. 8/05

Table of Contents

INTRODUCTION...................................................................................................................................................................3

FEATURES..............................................................................................................................................................................3

OPERATION...........................................................................................................................................................................4

OPERATION WITH STRAIN GAGE AMPLIFIER..........................................................................................................................4

OPERATION WITH THERMOCOUPLE AMPLIFIER......................................................................................................................4

SPECIFICATIONS.................................................................................................................................................................5

OUTPUT CONNECTIONS....................................................................................................................................................5

DIMENSIONS.........................................................................................................................................................................6

INPUT VOLTAGE..................................................................................................................................................................7

TROUBLESHOOTING..........................................................................................................................................................7

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Introduction

Michigan Scientific’s AC Remote Amplifier Control Unit is a complete system for controlling all
Michigan Scientific Spinning Amplifiers. The PS-AC-0.8 powers the amplifiers, controls excitation to
strain gage bridges, and commands Spinning Strain Gage Amplifiers to apply their internal shunt
calibration resistor to the appropriate arm of the strain gage bridge. The bridge excitation off feature
allows the user to detect self-generated system response (noise) from undesired environmental
conditions.

Features

• Bipolar power supply for spinning amplifiers

• Powers up to 18 spinning strain gage amplifiers*

• Remote bridge excitation On/Off capability

• Remote electronic shunt calibration capability

• Operates on 120 VAC @ 50/60 Hz**

• Ideal for laboratory applications

* with 5 Volt bridge excitation and 350 ohm bridge resistance
** other input voltages available

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Operation

Operation with Strain Gage Amplifier

The power switch on the PS-AC-0.8 unit activates the AC Remote Amplifier Control Unit and
illuminates the LED.

The bridge excitation switch, when used with the modular strain gage spinning amplifier, turns the
excitation to the bridge on or off without turning off the amplifier. This is done by inverting the
polarity of the

The shunt calibration switch remotely applies a positive or negative shunt resistance across bridge
terminals when used with a strain gage amplifier.

The LED is illuminated whenever the power is turned on.

The power switch on the PS-AC-0.8 unit activates the AC Remote Amplifier Control Unit and
illuminates the LED.

+ 15 V supply pins.

Operation with Thermocouple Amplifier

The bridge excitation and shunt calibration switches do not effect the operation of the thermocouple
amplifier.

The LED is illuminated whenever the power is turned on.

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Specifications

PARAMETER SPECIFICATIONS

OUTPUT

Voltage ± 15 V
Maximum Voltage Error (No Load) ± 0.75 V
Ripple and Noise Voltage (No Load) ± 60 mV
Maximum Source Resistance
Temperature Coefficient 0.30 %/°C
Maximum Current 0.8 A
Maximum Transient Response

INPUT

Voltage 100 - 120 VAC or 220 - 240 VAC
Frequency 50 / 60 Hz

ENVIRONMENT

Operation 0 to +50°C (+32 to +122°F)

e -40 to +85°C (-40 to +185°F

Stora

0.40

< 50

s

Output Connections

Switch Position Output (Volts)

Socket on Output Connectors

Bridge

Excitation

Off Center -15 V 15 V
Off Positive -15 V 15 V
Off Negative -15 V 15 V
On Center +15 V 15 V
On Positive +15 V 15 V
On Negative +15 V 15 V

Shunt

Calibration

A

B

C

+15 V 15 V

Common

+15 V 15 V

Common

+15 V 15 V

Common

-15 V 15 V

Common

-15 V 15 V

Common

-15 V 15 V

Common

D
Common
Common
Common
Common
Common
Common

E

Input

Ground

Input

Ground

Input

Ground

Input

Ground

Input

Ground

Input

Ground

F

0.0 V

+15 V

-15 V

0.0 V

+15 V

-15 V

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Dimensions

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rev. 8/05

Input Voltage

Normal input voltage for the AC Remote Amplifier Control Unit is 120 VAC at 50/60 Hz.
However, Michigan Scientic Corp. can modify the AC Remote Amplifier Control Unit to use 220
VAC or 240 VAC at 50/60 Hz. If the unit has been modified, it will be indicated on the rear
panel near the power cord.

Troubleshooting

Symptom Possible Cause Test to Verify Problem Solution

Power Light doesn’t

come on

+15 V shorted to common Remove cable from output

connector

+15 V shorted to –15 V Remove cable from output

connector

Blown fuse Check resistance across

fuse

No Power to Unit Check Voltage from

source

Find short and fix it
Find short and fix it

Replace fuse

Turn on power

Michigan Scientific Corp. Page 7
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rev. 8/05