Atec Endevco-2792B User Manual

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

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 [phone] [phone] fax [phone]
www.endevco.com Email:[e-mail]

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