PCB Piezotronics 441A35 User manual

Model 441A35
5-slot chassis with computer control (for Series 440 modules)
Installation and Operating Manual
For assistance with the operation of this product,
contact PCB Piezotronics, Inc.
Toll-free: 800-828-8840
24-hour SensorLine: 716-684-0001
Fax: [phone]
E-mail: [email protected]
Web: www.pcb.com

Manual 21354 Rev E
ECN 50523
Repair and Maintenance
PCB guarantees Total Customer Satisfaction through its
“Lifetime Warranty Plus” on all Platinum Stock Products
sold by PCB and through its limited warranties on all other
PCB Stock, Standard and Special products. Due to the
sophisticated nature of our sensors and associated
instrumentation, field servicing and repair is not
recommended and, if attempted, will void the factory
warranty.
Beyond routine calibration and battery replacements
where applicable, our products require no user
maintenance. Clean electrical connectors, housings, and
mounting surfaces with solutions and techniques that will
not harm the material of construction. Observe caution
when using liquids near devices that are not hermetically
sealed. Such devices should only be wiped with a
dampened cloth—never saturated or submerged.
In the event that equipment becomes damaged or ceases
to operate, our Application Engineers are here to support
your troubleshooting efforts 24 hours a day, 7 days a
week. Call or email with model and serial number as well
as a brief description of the problem.
Calibration
Routine calibration of sensors and associated
instrumentation is necessary to maintain measurement
accuracy. We recommend calibrating on an annual basis,
after exposure to any extreme environmental influence,
or prior to any critical test.
PCB Piezotronics is an ISO-9001 certified company whose
calibration services are accredited by A2LA to ISO/IEC
17025, with full traceability to SI through N.I.S.T. In
addition to our standard calibration services, we also offer
specialized tests, including: sensitivity at elevated or
cryogenic temperatures, phase response, extended high
or low frequency response, extended range, leak testing,
hydrostatic pressure testing, and others. For more
information, contact your local PCB Piezotronics
distributor, sales representative, or factory customer
service representative.
Returning Equipment
If factory repair is required, our representatives will
provide you with a Return Material Authorization (RMA)
number, which we use to reference any information you
have already provided and expedite the repair process.
This number should be clearly marked on the outside of
all returned package(s) and on any packing list(s)
accompanying the shipment.
Contact Information
PCB Piezotronics, Inc.
3425 Walden Ave.
Depew, NY14043 USA
Toll-free: [phone]
24-hour SensorLine: [phone]
General inquiries: in[email protected]
Repair inquiries: [e-mail]
For a complete list of distributors, global offices and sales
representatives, visit our website, www.pcb.com.
Safety Considerations
This product is intended for use by qualified personnel
who recognize shock hazards and are familiar with the
precautions required to avoid injury. While our equipment
is designed with user safety in mind, the protection
provided by the equipment may be impaired if equipment
is used in a manner not specified by this manual.
Discontinue use and contact our 24-Hour Sensorline if:
Assistance is needed to safely operate equipment
Damage is visible or suspected
Equipment fails or malfunctions
For complete equipment ratings, refer to the enclosed
specification sheet for your product.
Definition of Terms and Symbols
The following symbols may be used in this manual:
DANGER
Indicates an immediate hazardous
situation, which, if not avoided, may
result in death or serious injury.

Manual 21354 Rev E
ECN 50523
CAUTION
Refers to hazards that could damage
the instrument.
NOTE
Indicates tips, recommendations and
important information. The notes
simplify processes and contain
additional information on particular
operating steps.
The following symbols may be found on the equipment
described in this manual:
This symbol on the unit indicates that
high voltage may be present. Use
standard safety precautions to avoid
personal contact with this voltage.
This symbol on the unit indicates that
the user should refer to the operating
instructions located in the manual.
This symbol indicates safety, earth
ground.

Manual 21354 Rev E
ECN 50523
PCB工业监视和测量设备 - 中国RoHS2公布表
PCB Industrial Monitoring and Measuring Equipment - China RoHS 2 Disclosure Table
部件名称
有害物质
铅(Pb)
汞
(Hg)
镉
(Cd)
六价铬(Cr(VI))
多溴联苯 (PBB)
多溴二苯醚(PBDE)
住房
O
O
O
O
O
O
PCB板
X
O
O
O
O
O
电气连接器
O
O
O
O
O
O
压电晶体
X
O
O
O
O
O
环氧
O
O
O
O
O
O
铁氟龙
O
O
O
O
O
O
电子
O
O
O
O
O
O
厚膜基板
O
O
X
O
O
O
电线
O
O
O
O
O
O
电缆
X
O
O
O
O
O
塑料
O
O
O
O
O
O
焊接
X
O
O
O
O
O
铜合金/黄铜
X
O
O
O
O
O
本表格依据 SJ/T 11364 的规定编制。
O：表示该有害物质在该部件所有均质材料中的含量均在 GB/T 26572 规定的限量要求以下。
X：表示该有害物质至少在该部件的某一均质材料中的含量超出 GB/T 26572 规定的限量要求。
铅是欧洲RoHS指令2011/65/ EU附件三和附件四目前由于允许的豁免。
CHINA RoHS COMPLIANCE

Manual 21354 Rev E
ECN 50523
Component Name
Hazardous Substances
Lead (Pb)
Mercury (Hg)
Cadmium (Cd)
Chromium VI
Compounds
(Cr(VI))
Polybrominated
Biphenyls (PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
Housing
O
O
O
O
O
O
PCB Board
X
O
O
O
O
O
Electrical Connectors
O
O
O
O
O
O
Piezoelectric Crystals
X
O
O
O
O
O
Epoxy
O
O
O
O
O
O
Teflon
O
O
O
O
O
O
Electronics
O
O
O
O
O
O
Thick Film Substrate
O
O
X
O
O
O
Wires
O
O
O
O
O
O
Cables
X
O
O
O
O
O
Plastic
O
O
O
O
O
O
Solder
X
O
O
O
O
O
Copper Alloy/Brass
X
O
O
O
O
O
This table is prepared in accordance with the provisions of SJ/T 11364.
O: Indicates that said hazardous substance contained in all of the homogeneous materials for this part is below the limit
requirement of GB/T 26572.
X: Indicates that said hazardous substance contained in at least one of the homogeneous materials for this part is above the limit
requirement of GB/T 26572.
Lead is present due to allowed exemption in Annex III or Annex IV of the European RoHS Directive 2011/65/EU.

CHASSIS AND POWER SUPPLY
CHASSIS: MODELS 441A33, 441A35, 441A42, 441A43, 441A45 AND 441A49 ...............................................................................2
EQUIPMENT RATINGS ..............................................................................................................................................................2
MULTIPLE CHASSIS CONFIGURATION.......................................................................................................................................2
CHANGING THE FUSE ...............................................................................................................................................................2
DISABLING COOLING FAN ........................................................................................................................................................2
AVAILABLE MODULES ...................................................................................................................................................................2
AC POWER SUPPLY: MODEL 441A101...........................................................................................................................................3
DC POWER SUPPLY: MODEL 441A102...........................................................................................................................................3
OPERATION .............................................................................................................................................................................3
CHARGING THE BATTERY .........................................................................................................................................................3
APPENDIX A: FIGURES...................................................................................................................................................................4

CHASSIS AND POWER SUPPLY 2
Manual 19680 Rev. C
ECN 50523
Chassis: Models 441A33, 441A35,
441A42, 441A43, 441A45 and 441A49
The PCB Series 440 Modular Chassis is the enclosure into
which the modules of the PCB Modular Signal
Conditioning System are inserted. Its configuration varies
by model, ranging from two slots to nine; one slot is
reserved for the power supply, while Eurocard-style plug-
in modules occupy the remaining slots and are secured
to the inside frame using mechanical fasteners. A circuit
board assembly in the rear of the chassis distributes
power to the modules and provides the means by which
modules communicate with each other, the rest of the
system, and a personal computer.
Models 441A33, 441A35 and 441A38 are the computer-
controlled, master versions of the standard chassis. The
back panel of these master chassis have two RS-485
connectors marked IN and OUT and one RS-232 connector.
Models 441A45 and 441A49 are slave chassis designed to
be controlled by the masters. Slave chassis also have two
RS-485 connectors, but no RS-232 connector. In a multiple
chassis system, the master controller communicates to the
other modules via the common RS-485 network and to the
computer via the RS-232 connection.
Equipment Ratings
This equipment operates at 104F (40C), in an
environment having 93% relative humidity. Its frequency
range is 50/60 Hz. Operation of this unit is limited to
environments having an altitude of less than 2 000 meters.
The pollution degree for operation of the Model 440 is two
(2), meaning that normally, only non-conductive pollution
occurs. The over voltage category is II, indicating the
transient voltage levels that may be tolerated by the
equipment.
Multiple Chassis Configuration
High voltage electrostatic discharge
(ESD) can damage electrical devices.
To avoid triboelectric transfer:
1. Connect the cables only with the AC power off.
2. Temporarily “short” the end of the cable before
attaching it to any signal input or output.
Each master controller can control up to four chassis filled
with modules. Each chassis (or rack) must, however, be
uniquely defined. This is accomplished by setting rack
addresses. There are two jumpers on the upper right
portion of the backplane labeled RAD1 and RAD0, as shown
on Figure 1 in Appendix A. The settings are as follows:
RAD1
RAD0
Rack 1
Low
Low
Rack 2
Low
High
Rack 3
High
Low
Rack 4
High
High
Refer to Figure 2 in Appendix A for a four-rack
configuration. Notice on the drawing that the RS-485 IN
connection on Rack 1 requires termination, as does the 485
OUT connection on Rack 4. The 485 IN is terminated with
the TER1, TER2 and TER3 terminators on the backplane.
The termination settings are also shown.
Changing the Fuse
Two rear panel fuses, located below switch in the AC
receptacle, protect the power line inputs of the instrument.
The fuse type is a T 1.6A, L 250 V. To change the fuse,
disconnect the power cord. Find the slot just above the
power switch and pull forward to open the door that
exposes the fuse drawers. Pull the individual drawer
forward and insert a new fuse.
Disabling Cooling Fan
If it is necessary to turn off the cooling fan in order to
reduce acoustical noise, a jumper “J2,” located on the
motherboard, must be removed. In order to access this
jumper, the rear panel must be taken off. The fan may then
be disabled via a command from the host computer
controlling the master. The fan should be disabled for as
short a period as possible to ensure continuous cooling.
Contact the factory for more details.
Available Modules
For more information on individual modules, please see the
individual manual accompanying each of the following:

CHASSIS AND POWER SUPPLY 3
Manual 19680 Rev. C
ECN 50523
Model 442A102: Single-channel, line powered
ICPsensor signal conditioner, unity gain.
Model 442A103: Single-channel, line powered ICP
sensor signal conditioner, with gain of x1, x10, x100.
Model 442B104: Four-channel, line powered ICP
sensor signal conditioner, with gain of x1, x10, x100.
Optional 477A-type plugin filters available.
Model 442A101: Single-channel, line powered ICP
sensor signal conditioner, with gain of x1, x10, x100,
AC/DC coupled.
Model 443B101: Dual-mode ICP/charge amplifier –
vibration (2-slot).
Model 443B102 Dual-mode ICP/charge amplifier –
pressure or force (2-slot).
AC Power Supply: Model 441A101
The Model 441A01 is a single-slot, CE marked, AC-line
power supply designed to fit only the extreme right slot of
the PCB Series 440 Modular Chassis. It supplies a maximum
of 45 watts of power and may be used to operate single or
multiple signal conditioning modules housed in the two-,
three-, or nine-wide standard chassis and optional auxiliary
chassis. Please note that while this unit is rated for a
maximum wattage of 45, CE requirements mandate that it
be used only up to 30 watts.
For wattage calculations, refer to the specification sheet for
the individual module. To determine power capability of
your particular set-up, add all the powers for all modules.
CE mandates that these totals must be < 30 watts.
DC Power Supply: Model 441A102
Model 441A102 is a single width, CE marked, rechargeable
DC battery power supply that can be used in place of the
441A101 AC Power. Standard accessories include:
Model 017A22 power cord
Model 488A08 battery charger
Built-in 3.0 Ah NiMH rechargeable battery
The optional Model 488A09 is a 12VDC @3.4A AC Power
Adaptor that allows the 441A102 to be used with any AC line
power in the world. (100-240VAC 50/60Hz).
The 441A102 can be used to power up to 30 watts of PCB
modular series units. For wattage calculations, refer to the
specification sheet for the individual module. To determine
power capability of your particular set-up, add all the powers
for all modules. CE mandates that these totals must be < 30
watts.
Operation
To operate, slide into the power supply slot of the PCB Series
440 Modular Chassis, tighten up the two mounting screws
and turn the power switch to ON.
Charging the Battery
To calculate the estimated battery life, divide 30 by the total
number of watts of all the modules being used. Refer to
module specification sheets for the number of watts to use in
your calculation. To charge the battery:
1. Turn power off on the front panel of the 441A102.
2. Plug the Model 488A08 into the charger input jack.
3. The yellow charge light on the charger will light solid
during fast charge as indicated on the charger. Typical
charge time for a totally depleted battery is 1.5 to 2
hours.
4. After the battery is charged about 90%, the charge light
will begin to blink (1/8 sec blink). If possible, leave
charger on with charge light blinking for another few
hours to get maximum charge.
Remove the charger plug by pulling
on the body of the connector, not
the cord. This is a locking feature to
ensure a good connection while
charging.
The 441A102 has some components that
will get hot under heavy loads.
Do not remove the module from the
enclosures immediately after continuous
heavy use. Let completely cool first.
It is not recommended to charge the
441A102 while the power switch is ON. No
damage will occur, but charge time will
increase.

CHASSIS AND POWER SUPPLY 4
Manual 19680 Rev. C
ECN 50523
Appendix A: Figures

CHASSIS AND POWER SUPPLY 5
Manual 19680 Rev. C
ECN 50523

Model 443B102
Dual Mode Modular Signal Conditioner Card
Installation and Operating Manual
For assistance with the operation of this product,
contact PCB Piezotronics, Inc.
Toll-free: 800-828-8840
24-hour SensorLine: 716-684-0001
Fax: [phone]
E-mail: [email protected]
Web: www.pcb.com

Manual 21354 Rev E
ECN 50523
Repair and Maintenance
PCB guarantees Total Customer Satisfaction through its
“Lifetime Warranty Plus” on all Platinum Stock Products
sold by PCB and through its limited warranties on all other
PCB Stock, Standard and Special products. Due to the
sophisticated nature of our sensors and associated
instrumentation, field servicing and repair is not
recommended and, if attempted, will void the factory
warranty.
Beyond routine calibration and battery replacements
where applicable, our products require no user
maintenance. Clean electrical connectors, housings, and
mounting surfaces with solutions and techniques that will
not harm the material of construction. Observe caution
when using liquids near devices that are not hermetically
sealed. Such devices should only be wiped with a
dampened cloth—never saturated or submerged.
In the event that equipment becomes damaged or ceases
to operate, our Application Engineers are here to support
your troubleshooting efforts 24 hours a day, 7 days a
week. Call or email with model and serial number as well
as a brief description of the problem.
Calibration
Routine calibration of sensors and associated
instrumentation is necessary to maintain measurement
accuracy. We recommend calibrating on an annual basis,
after exposure to any extreme environmental influence,
or prior to any critical test.
PCB Piezotronics is an ISO-9001 certified company whose
calibration services are accredited by A2LA to ISO/IEC
17025, with full traceability to SI through N.I.S.T. In
addition to our standard calibration services, we also offer
specialized tests, including: sensitivity at elevated or
cryogenic temperatures, phase response, extended high
or low frequency response, extended range, leak testing,
hydrostatic pressure testing, and others. For more
information, contact your local PCB Piezotronics
distributor, sales representative, or factory customer
service representative.
Returning Equipment
If factory repair is required, our representatives will
provide you with a Return Material Authorization (RMA)
number, which we use to reference any information you
have already provided and expedite the repair process.
This number should be clearly marked on the outside of
all returned package(s) and on any packing list(s)
accompanying the shipment.
Contact Information
PCB Piezotronics, Inc.
3425 Walden Ave.
Depew, NY14043 USA
Toll-free: [phone]
24-hour SensorLine: [phone]
General inquiries: in[email protected]
Repair inquiries: [e-mail]
For a complete list of distributors, global offices and sales
representatives, visit our website, www.pcb.com.
Safety Considerations
This product is intended for use by qualified personnel
who recognize shock hazards and are familiar with the
precautions required to avoid injury. While our equipment
is designed with user safety in mind, the protection
provided by the equipment may be impaired if equipment
is used in a manner not specified by this manual.
Discontinue use and contact our 24-Hour Sensorline if:
Assistance is needed to safely operate equipment
Damage is visible or suspected
Equipment fails or malfunctions
For complete equipment ratings, refer to the enclosed
specification sheet for your product.
Definition of Terms and Symbols
The following symbols may be used in this manual:
DANGER
Indicates an immediate hazardous
situation, which, if not avoided, may
result in death or serious injury.

Manual 21354 Rev E
ECN 50523
CAUTION
Refers to hazards that could damage
the instrument.
NOTE
Indicates tips, recommendations and
important information. The notes
simplify processes and contain
additional information on particular
operating steps.
The following symbols may be found on the equipment
described in this manual:
This symbol on the unit indicates that
high voltage may be present. Use
standard safety precautions to avoid
personal contact with this voltage.
This symbol on the unit indicates that
the user should refer to the operating
instructions located in the manual.
This symbol indicates safety, earth
ground.

Manual 21354 Rev E
ECN 50523
PCB工业监视和测量设备 - 中国RoHS2公布表
PCB Industrial Monitoring and Measuring Equipment - China RoHS 2 Disclosure Table
部件名称
有害物质
铅(Pb)
汞
(Hg)
镉
(Cd)
六价铬(Cr(VI))
多溴联苯 (PBB)
多溴二苯醚(PBDE)
住房
O
O
O
O
O
O
PCB板
X
O
O
O
O
O
电气连接器
O
O
O
O
O
O
压电晶体
X
O
O
O
O
O
环氧
O
O
O
O
O
O
铁氟龙
O
O
O
O
O
O
电子
O
O
O
O
O
O
厚膜基板
O
O
X
O
O
O
电线
O
O
O
O
O
O
电缆
X
O
O
O
O
O
塑料
O
O
O
O
O
O
焊接
X
O
O
O
O
O
铜合金/黄铜
X
O
O
O
O
O
本表格依据 SJ/T 11364 的规定编制。
O：表示该有害物质在该部件所有均质材料中的含量均在 GB/T 26572 规定的限量要求以下。
X：表示该有害物质至少在该部件的某一均质材料中的含量超出 GB/T 26572 规定的限量要求。
铅是欧洲RoHS指令2011/65/ EU附件三和附件四目前由于允许的豁免。
CHINA RoHS COMPLIANCE

Manual 21354 Rev E
ECN 50523
Component Name
Hazardous Substances
Lead (Pb)
Mercury (Hg)
Cadmium (Cd)
Chromium VI
Compounds
(Cr(VI))
Polybrominated
Biphenyls (PBB)
Polybrominated
Diphenyl Ethers
(PBDE)
Housing
O
O
O
O
O
O
PCB Board
X
O
O
O
O
O
Electrical Connectors
O
O
O
O
O
O
Piezoelectric Crystals
X
O
O
O
O
O
Epoxy
O
O
O
O
O
O
Teflon
O
O
O
O
O
O
Electronics
O
O
O
O
O
O
Thick Film Substrate
O
O
X
O
O
O
Wires
O
O
O
O
O
O
Cables
X
O
O
O
O
O
Plastic
O
O
O
O
O
O
Solder
X
O
O
O
O
O
Copper Alloy/Brass
X
O
O
O
O
O
This table is prepared in accordance with the provisions of SJ/T 11364.
O: Indicates that said hazardous substance contained in all of the homogeneous materials for this part is below the limit
requirement of GB/T 26572.
X: Indicates that said hazardous substance contained in at least one of the homogeneous materials for this part is above the limit
requirement of GB/T 26572.
Lead is present due to allowed exemption in Annex III or Annex IV of the European RoHS Directive 2011/65/EU.

DUAL-MODE AMPLIFIER
443B101/443B102
BEFORE OPERATING ............................................................................................................................................................... 2
ELECTROSTATIC DISCHARGE.........................................................................................................................................................2
EQUIPMENT RATINGS ..................................................................................................................................................................2
GROUNDING................................................................................................................................................................................2
EQUIPMENT OVERVIEW.......................................................................................................................................................... 2
COMPONENTS AND FEATURES ............................................................................................................................................... 2
INPUT ..........................................................................................................................................................................................2
LOW PASS FILTERS .......................................................................................................................................................................3
INTEGRATOR AMPLIFIERS ............................................................................................................................................................3
OUTPUT AMPLIFIER .....................................................................................................................................................................3
OVERLOAD DETECTOR .................................................................................................................................................................3
REFERENCE OSCILLATOR ..............................................................................................................................................................3
OPERATION ............................................................................................................................................................................ 3
SET-UP AND MEASUREMENT .......................................................................................................................................................3
SETTING THE OPERATIONAL MODE..............................................................................................................................................3
SETTING THE SENSOR SENSITIVITY ...............................................................................................................................................3
SETTING THE OUTPUT SENSITIVITY ..............................................................................................................................................4
SETTING THE TIME CONSTANT.....................................................................................................................................................4
ZEROING THE OUTPUT IN LONG TIME CONSTANT MODE (443B102 ONLY)...................................................................................5
SETTING THE LOW PASS FILTER....................................................................................................................................................5
TEDS FEATURES............................................................................................................................................................................5
VELOCITY MEASUREMENT ...........................................................................................................................................................5
DISPLACEMENT MEASUREMENT..................................................................................................................................................6
USING THE SETUP MEMORY ........................................................................................................................................................6
SETTING THE LCD BACKLIGHT LEVEL.............................................................................................................................................6
COMPUTER / RS-232 CONTROL....................................................................................................................................................6
APPENDIX A: RS-232 CONTROL .............................................................................................................................................. 7
COMMAND SET............................................................................................................................................................................9
APPENDIX B: FIGURES........................................................................................................................................................... 43

443B101/443B102 2
Manual 19854 Rev. D
ECN 50523
Before Operating
Electrostatic Discharge
High voltage electrostatic discharge
(ESD) can damage electrical devices.
To avoid triboelectric transfer:
1. Connect cables only with the AC power off.
2. Temporarily “short” the end of the cable before
attaching it to any signal input or output.
Additionally, internal adjustments should be done
ONLY in an ESD-safe work area. Even ESD-protected
electronics can be vulnerable to extremely high volt-
age.
Equipment Ratings
This equipment operates at 104F (40C), in an
environment having 93% relative humidity. Its
frequency range is 50/60 Hz. Operation of this unit
is limited to environments having an altitude of less
than 2 000 meters. The pollution degree for
operation of the Model 440 is two (2), meaning that
normally, only non-conductive pollution occurs.
The overvoltage category is II, indicating the
transient voltage levels that may be tolerated by the
equipment.
For complete specifications, refer to the enclosed
specification sheet.
Grounding
Indiscriminate grounding of instruments can
introduce ground loop interference. To prevent this,
it is necessary to ensure that the signal ground lines
of the 443B and any other instruments with which it
is used are grounded at one point only in the meas-
urement system.
Connect the signal ground lines of all the instru-
ments together. This is done through the shields of
the input and the output cables used to interconnect
the instruments.
If an instrument with a mains socket chassis terminal
is used in the measurement system, check that a)
only one of the instruments has its signal ground
connected via the chassis to mains ground, and b)
the housing of the transducer is isolated from
grounded measurement sources.
If the measurement set-up is mounted in a metal
instrumentation rack, ensure that only one of the
instruments has its signal ground connected to the
chassis (and chassis connected to mains ground if
the unit has a mains socket chassis terminal).
Equipment Overview
The Model 443B Dual-Mode Amplifier is a
comprehensively equipped charge and ICP®
preamplifier intended for use with piezoelectric
pressure, force and vibration sensors. This amplifier
is particularly useful for field and laboratory
measurement of acceleration, velocity, and
displacement vibration.
Designed to fit into the PCB Modular Signal
Conditioning System, the Model 443B may be used
as a single-channel stand-alone system or as part of
a four-channel package housed in a single cabinet. It
may be controlled remotely via an RS-232 interface
when used with a 441 Series chassis with computer
control.
ICP® accelerometers with TEDS electronics can be
auto-normalized using the Auto TEDS feature. Full
TEDS data may be read from the TEDS menu, or
through the RS-232 port. Additionally, sensor
sensitivity can be digitally selected, and the amplifier
can store up to five setups for easy recall.
The unit has unified output ratings, built-in
integrators for velocity and displacement, switchable
low and high pass filters, and a built-in reference
signal. The output is routed to portable Sony DAT
Recorders, scopes, and frequency analyzers. In addi-
tion, the Model 443B102 offers medium and long
time constant settings.
See Figure 3 in Appendix B for Block Diagram.
Components and Features
Input
The input signal is fed to the amplifier via the input
connector on the front panel. When sensors with

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high temperature transient sensitivity are used, the
high pass filter of the amplifier can be changed from
0.2 Hz to 2 Hz, reducing the influence from
temperature-induced signals. The overall gain of the
amplifier is the ratio of the output sensitivity to the
sensor sensitivity.
Low Pass Filters
Six selectable upper cutoff frequencies are provided
by the low pass filter, located just after the input
amplifier to filter out unwanted signal components
before further amplification. The filters are of the
two-pole configuration, giving a 12 dB/octave cutoff.
The low pass filter section may be turned off giving a
frequency response of >200 kHz.
Integrator Amplifiers
The integrator amplifiers provide single integration
for velocity and double integration for displacement.
Two low-frequency cutoff settings of 1 or 10 Hz are
provided in the velocity and displacement modes to
suppress low-frequency noise.
Output Amplifier
The output amplifier provides the signal to the con-
tinuous gain stage and then to the BNC output
connector on the front panel. It provides a fixed gain
of x1 or x10.
Typical frequency response as a function of
capacitive load of the output of the 443B dual mode
amplifier is shown in Figure 7 of Appendix B. Note
that for a frequency range up to 10kHz, a capacitive
load of up to 50 nF may be applied. For standard
cable with a shunt capacitance of 100pF/m, up to
500 m of output cable can be used to cover this
frequency range.
Overload Detector
The overload detector monitors the output of the
charge amplifier, the low pass filter, and the output,
so overload in various parts of the circuitry are not
masked by filtering. The overload indicator is located
on the front panel. In ICP® mode, the sensor output
is also monitored for overloads.
Reference Oscillator
The Model 443B has a built-in reference signal
source, providing a signal of 100 pC RMS at 159.2 Hz
in charge mode. In ICP®mode, the reference signal is
1 V RMS. These signals can be used as a reference
when using portable DAT recorders.
Operation
Set-Up and Measurement
1. Connect the Model 443B to a suitable power
source. Switch the unit on and let it stabilize for
30 seconds.
2. Connect the output of the 443B to a suitable
indicating instrument, voltmeter, scope or
frequency analyzer.
3. Select a suitable accelerometer to be used for
the measurement and observe the correct
mounting and installation instructions. Connect
it to the input connector of the Model 443B.
4. Refer to the accelerometer’s calibration chart to
select the sensitivity.
Setting the Operational Mode
1. Press the MENU button on the Model 443B. The
main menu appears on the screen of the Model
443B.
2. Select the MODE position with the down button.
3. Press the MENU button again. The display now
shows the following text:
Charge Ref. On
ICP Ref. Off
4. Select the mode by moving the cursor to Charge
or ICP® depending upon which type of sensor is
being used. Note that in ICP® mode, zero
current can be selected, which will put the unit
in voltage mode.
5. The internal sinusoidal reference may be turned
on by moving the cursor to Ref. On and pressing
the MENU button. To turn off the reference,
move the cursor to Ref. Off in the MODE menu
and press MENU.
Setting the Sensor Sensitivity
1. Press the MENU button again and select SEN

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by pressing the right-facing arrow.
2. Press the MENU button again and the cursor is
now in the sensor sensitivity position.
3. Enter the sensitivity for the selected
accelerometer using the keys with up and down
arrows. Note that if the up or down key is held,
the display will increment or decrement
continuously.
4. Press the MENU key again and the selected
charge sensitivity now shows on the Model
443B’s display.
Setting the Output Sensitivity
1. Press the MENU button. Move the cursor to
OUT.
2. Press the MENU button again and the cursor is
at the output position. Set the output to the
desired setting.
3. Press the MENU button again and the desired
output setting shows on the Model 443B.
Setting the Time Constant
1. Press the MENU button again and select the LF
position.
2. Press the MENU button again, and the display
shows:
0.2 Hz 2.0 Hz.
Low Freq. Sel.
Select the suitable lower-limiting frequency of 2
Hz for sensors with high temperature transient
sensitivity.
3. The Model 443B102 includes medium and long
TC options as well. To access them, press the
down key again. The display shows:
Med TC Long TC
Low Freq. Sel
4. Press the MENU button again after selecting the
desired setting. For 0.2Hz, 2Hz and med TC the
Model 443B now indicates the selected setting.
Verify the setting by the indication on the front
panel.
5. If long time constant is selected in charge mode
(443B102 only), the display will briefly indicate:
Time Constant is >10,000 sec
or:
Time Constant is >100,000 sec
depending on the gain selected. And then:
Autozero in Progress
The autozero function zeros the output to
within 50 mV of ground.
6. The next display will be:
Null Drift?
Yes No
The 443B102 has a built-in automated drift
nulling routine which ensures that the drift is
well within the stated specification. This should
be run after the unit has been on for at least
one hour in long TC mode to allow for proper
warm up time. Selecting “Yes” begins the
routine. The internal microprocessor will then
begin adjusting the leakage current so that the
drift is minimized. The process may take up to
about 10 minutes, depending on how much
adjustment is necessary.
It is recommended that the sensor be
disconnected during nulling so that the
input is not disturbed.
During nulling, the display will show:
Nulling Drift
Comp Lvl = X.XXX
Where X.XXX is the voltage used internally to
adjust the drift. It may range between 5v. If it
is necessary to terminate nulling before it is
complete, press the MENU key and the unit will
return to normal operation. Once the nulling
has been completed, the LCD will return to the
operating display.
7. If the microprocessor is unable to satisfactorily
null the drift, the LCD will display:
Unable to Null
Try Again Exit
Selecting “Try Again”will begin the nulling
routine, while “Exit”will return the unit to
normal operation. Common reasons for failing
to null are insufficient warm up time, or leaving
the sensor connected to the input.

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8. Long TC may be selected in ICP® mode, so that
the amplifier is DC coupled. When long TC is
selected, the LCD will display:
Adjust DC Offset
X.XXXX V
The up and down keys may then be used to
adjust the offset so that the sensor bias is
removed from the signal.
Zeroing the Output in Long Time Constant
Mode (443B102 only)
1. To zero the output after making a long time
constant measurement, simply push the ZERO
key. Alternatively, a two-conductor cable with an
SMB connector may be plugged into the EXT
ZERO receptacle on the front panel. When the
center conductor is shorted to the shell, the ZERO
will be actuated.
2. ZERO may be locked in long time constant mode
by holding down the ZERO key for several
seconds. The display will then read:
ZERO LOCKED ON
Push ZERO to Res
This will hold the output at about zero volts,
regardless of the charge input. It is
recommended to lock the zero on when
connecting or disconnecting a sensor, or
whenever there is a possibility of overloading
the amplifier.
3. To release the zero lock, simply push the ZERO
key again.
Setting the Low Pass Filter
1. Press the MENU button.
2. Select LPF using the down and right arrow keys.
3. Press the MENU button again. The 443B now
shows the following:
0.1k 1k 3k
10k 30k 100k Off
Using the up/down and right/left arrow keys,
select the desired low-pass frequency setting.
4. Press the MENU button a final time to verify the
correct LPF setting on the front panel.
TEDS Features
The 443B incorporates several features which allow
the use of sensors with TEDS electronics. The 443B
can read the raw data from any TEDS sensor, and is
able to locally decode the data from sensors using
IEEE 1451.4, UTID 1, and UTID 116225. Raw data in
hex form is also available via the RS-232 interface
which may then be decoded by the host computer.
The RS-232 commands are described in Appendix A.
The easiest way to take advantage of TEDS sensors is
the use the auto normalization feature. This feature
automatically reads the data in a TEDS sensor when
it is connected to the 443B and sets the sensitivity to
the value stored in the sensor. Thus the user is
spared the inconvenience (and potential error) of
locating the sensor’s data sheet and manually
entering this information. The auto-normalize
feature is normally disabled, but may be enabled if
desired by selecting TEDS from the main menu and
then selecting OFF when the Auto TEDS Read menu
is displayed.
The Auto Teds feature can cause erratic
output when used with certain sensors.
To avoid this possibility, Auto TEDS
should be disabled for sensors that have
time constants of 1 second or longer, or
sensors with high sensitivities (1 V/g and
up) .
The remainder of the TEDS data may be viewed by
selecting TEDS from the main menu, and continuing
through the Auto TEDS Read On/Off menu. The next
display will read:
SELECT UNITS
SI ENGLISH
This selection determines whether the TEDS data is
displayed in SI or English units. Once this selection
has been made, all stored data may be viewed by
pushing the down key to scroll through it.
Velocity Measurement
1. Press MENU button. The main menu appears on
the display: