Michigan Scientigic PS-AC-0.8 User manual

Michigan Scientific Corp. Page 1
[phone] [phone]
rev. 8/05
321 E. Huron Street
Milford, MI 48381
[phone]
Fax: [phone]
http://www.michsci.com
[email protected]
8500 Ance Road
Charlevoix, MI 49720
[phone]
Fax: [phone]
PS-AC-0.8
AC Remote Amplifier Control Unit
OPERATOR’S MANUAL

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 +15 V supply pins.
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.
Operation with Thermocouple 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 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 0.40
Ω
Temperature Coefficient 0.30 %/°C
Maximum Current 0.8 A
Maximum Transient Response < 50
µ
s
INPUT
Voltage 100 - 120 VAC or 220 - 240 VAC
Frequency 50 / 60 Hz
ENVIRONMENT
Operation 0 to +50°C (+32 to +122°F)
Stora
g
e -40 to +85°C
(
-40 to +185°F
)
Output Connections
Switch Position Output (Volts)
Socket on Output Connectors
Bridge
Excitation Shunt Calibration A B C D E F
Off Center -15 V 15 V
Common +15 V 15 V Common Input Ground 0.0 V
Off Positive -15 V 15 V
Common +15 V 15 V Common Input Ground +15 V
Off Negative -15 V 15 V
Common +15 V 15 V Common Input Ground -15 V
On Center +15 V 15 V
Common -15 V 15 V Common Input Ground 0.0 V
On Positive +15 V 15 V
Common -15 V 15 V Common Input Ground +15 V
On Negative +15 V 15 V
Common -15 V 15 V Common Input Ground -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
+15 V shorted to common Remove cable from output
connector Find short and fix it
+15 V shorted to –15 V Remove cable from output
connector Find short and fix it
Blown fuse Check resistance across
fuse Replace fuse
Power Light doesn’t
come on
No Power to Unit Check Voltage from
source Turn on power
Michigan Scientific Corp. Page 7
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rev. 8/05