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ENDEVCO
MODEL
2792B
ISOTRON®Signal Conditioner
Model 2792B
• 9-Channel Constant Current Supply/
Amplifier for ISOTRON (Piezoelectric
Voltage Mode) Accelerometers
or Remote Charge Convertors
• Transducer Sensitivity Normalization
and LED Status Indicators
• Wide Frequency Range: 1 Hz to 80 kHz
DESCRIPTION
The ENDEVCO®Model 2792B nine-channel signal conditioner is a versatile power supply/amplifier
for ISOTRON accelerometers and other piezoelectric voltage mode transducers. It can also power
Remote Charge Convertors (RCC) in a high impedance piezoelectric measurement system. Each
channel provides a constant current excitation (4 mA or 10 mA) for the transducer or the RCC, input
sensitivity normalization, and a switched gain output. Individual LED status indicator informs the user
of short, open, or normal conditions.
Model 2792B
(2 of 9 channels shown)
ISOTRON / Voltage Type
Accelerometer
High Impedance
Piezoelectric
Accelerometer
Remote Charge
Converter
BNC
Outputs
Analyzer
4 mA
or
10 mA
Transducer
Input
Status
Indicator
Sensitivity
Normalization
Gain Selection
1 to 10
Decoupling
Capacitor
AC/DC
Power Supply
(Common)
AC Power
Input
Output
Model 2792B Block Diagram, Per Channel
Typical Applications
Not actual size
ISOTRON / ICP Type
Accelerometer
H igh Impedance
Piez oelect ric
Acc ele rometer
4 mA
or
10 mA
Transducer
Input
Model 2792B
(2 of 9 channels shown)
BNC
1 or 10
Ou tputs
AC/ DC
Power Supply
(Common)
Analyzer
Decoupling
Capacitor
Remote Charge
Convertor
Typical Applications
Status
indicator
Sensitivity
Normalization
Model 2792B Block Diagram, Per Channel
Gain Selection
AC Power
Input
Output
APPLIES TO CALIFORNIA FACILITY
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ENDEVCO
MODEL
2792B
ISOTRON®Signal Conditioner
SPECIFICATIONS
INPUTS
TYPE Single-ended, constant current two-wire system
INPUT IMPEDANCE > 20 k Ω
EXCITATION CURRENT 4 mA or 10 mA±10%, set by internal jumper, per channel
COMPLIANCE VOLTAGE > 18 V. This voltage is the sum of AC and DC components
OUTPUTS
TYPE Single-ended one side connected to circuit ground
OUTPUT IMPEDANCE < 10 Ω, in series with at least 40 µF
LINEAR OUTPUT VOLTAGE 10 V pk-pk (3.535 V rms) or greater
LINEAR OUTPUT CURRENT 2.0 mA pk-pk or greater
TRANSFER CHARACTERISTICS
GAIN 0.001 to 99.9 continuously
Adjustable using the full scale Digi switch and THD x1/x10 switch
Accuracy ±1.5% (Including variation with temperature and time)
FREQUENCY RESPONSE Flat within ±5% from 1 Hz to 30 kHz, reference at 100 Hz
Lower Cutoff Frequency -5% at 1 Hz, -3dB at 0.3 Hz (typical)
Upper Cutoff Frequency -5% at 30 kHz, -3dB at 80 kHz (typical)
AMPLITUDE LINEARITY 1% of reading from best-fit straight line approximation
RESIDUAL NOISE 0.4 mV rms maximum for gains 0.5 to 2.0 gain. 2 mV rms maximum for 5.0 to 20.0
or 2.0 or 2 mV rms gains of 5.0 to 20.0 within a 30 KHz bandwidth.
TOTALHARMONIC DISTORTION Less than 1% for signals of full scale or less at any gain from .5 to 20.0
CROSSTALK 20.0 mV rms maximum RTO or 1.0 mV rms RTI whichever is greater
Crosstalk specification is valid for the following conditions:
One channel set at 100% of nominal sensitivity and x1 gain
Adjacent channel set at any gain up to 20.0 (eg. 50% nominal sensitivity
and x 10 gain) with a 250 Ω shunt resistor at the input
ENVIRONMENTAL CHARACTERISTICS
TEMPERATURE Operating +32°F to +122°F (0°C to +50°C)
Storage -65°F to +185°F (-54°C to +85°C)
HUMIDITY 95% R.H.
POWER
LINE VOLTAGE 100/120/220/240 VAC 50 to 60 Hz (switch selectable)
PHYSICAL
DIMENSIONS 19" rack mounting, 1.73" h x 19.00" w x 9.45" d (44 mm x 483 mm x 240 mm)
WEIGHT 3.97 lbs. (1.8 kg)
FRONT PANEL FEATURES
Power Indicator LED indicates when power is applied
Gain Switch Two-position, recessed switch for gain of 1 or 10
Sensitivity Normalization Four-digit pushbutton switch. See example below
Status Indicators LED will light green, when the transducer is connected properly. The LED
will light red when the input is shorted. The LED will not light when the input
is open
REAR PANELFEATURES
Input Connectors BNC
Output Connectors BNC
ACCESSORIES
Instruction Manual
EW599 AC POWER CORD
SENSITIVITY NORMALIZATION/ADJUSTMENT:
A four digit push button switch is used to normalize each channel to allow for
variation in nominal sensitivity of the transducer. The switch is set to read the
actual percentage of nominal (desired) sensitivity. For example, if the nominal
(desired) sensitivity is 10.0 mV/g and the actual sensitivity is 10.21 mV/g, set
Percentage of Nominal Sensitivity Switch to 102.1; Gain Switch to x1. If nominal
(desired) sensitivity is 100 mV/g and the actual sensitivity is 10.21 mV/g, set
Percentage of Nominal Sensitivity Switch to 10.21 and Gain Switch to x 10.
Continued product improvement necessitates that Endevco reserve the right to modify these specifications without notice. Endevco maintains a program of constant surveillance over all products to ensure a high level of reliability. This program includes attention to reliability factors during product design, the support of
stringent Quality Control requirements, and compulsory corrective action procedures. These measures, together with conservative specifications have made the
name Endevco synonymous with reliability.
ENDEVCO CORPORATION, 30700 RANCHO VIEJO ROAD, SAN JUAN CAPISTRANO, CA92675 USA (800) 982-6732 (949) 493-8181 fax (949) 661-7231
www.endevco.com Email:applications@endevco.com
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