DayTronic System 10 - Model 10 A76 Vibration Conditioner Card; 1 General Description and Specifications

1 GENERAL DESCRIPTION AND SPECIFICATIONS
The single-channel Model 10A76 measures the true RMS value of the vibratory com-
ponent of the output signal of a conventional
strain gage accelerometer of up to 50
mV, full scale—for which selectable excitation of 1, 5, or 10 V-DC is provided. It is ideal
for any number of applications where the accurate monitoring of vibration is critical—
as, for example, in the testing of motors, gear-boxes, pumps, engines, conveyors,
fans, and compressors.
The 10A76 yields two “subchannels,” with corresponding analog outputs to wire-wrap
pins:
• Subchannel No. 1:VIBRATORY COMPONENT (RMS)
• Subchannel No. 2:AVERAGE ACCELERATION
Providing a “front-end” signal amplifier with fixed gain of 100, the 10A76 also features
a 10-Hz high-pass filter with selectable gain, followed by a band-pass filter with selec-
table upper cut-off frequencies. It can thus be configured for specific test or process
conditions such as operating frequency or RPM, expected vibration amplitude, etc.
(see Section 3, below).
As explained in Section 3.d, the 10A76 employs a combined “calculated” and “two-
point” calibration procedure.
ADDITIONAL 10A76 SPECIFICATIONS
Input Range:
Accepts a signal of up to 50 mV, full scale, from a conventional strain
gage accelerometer
; for “type” codes assigned to 10A76 data channels on the
basis of desired pass-band cutoff frequency, Table 2, Section 3.c, below
Excitation: Selectable 1, 5, or 10 V-DC nominal; 80 mA, maximum
Amplifier:
Normal-Mode Range: ±100 mV operating; ±5 V without instrument damage
Common-Mode Range: ±2 V operating; ±5 V without instrument damage
Common-Mode Rejection Ratio: DC: -90 dB; 60 Hz: -60 dB; 1 kHz: -50 dB
Input Impedance (Differential and Common-Mode): 10
8
MΩ and 5-nanoamp
bias current; for special analog filtering provisions, see the
Filter specification,
below
Offset: Initial: ±0.2% of full scale; vs. Temperature: ±50 ppm/°C
(cont’d)
MODEL 10A76
VIBRATION
CONDITIONER CARD
GENERAL DESCRIPTION AND SPECIFICATIONS 10A76.1
1.E.2.10A76
SYSTEM 10
ANALOG INPUT CARDS