ENDEVCO
www.endevco.com Tel: +1 (866) ENDEVCO [+1 (866) 363-3826]
IM133, Page 4
®
1.2
DESCRIPTION
The ENDEVCO® Model 133 ISOTRON/Charge Amplifier is a three-channel signal conditioner
designed for use with piezoelectric accelerometers, ISOTRON® (voltage type) accelerometers,
and remote charge converters. The unit provides an AC output voltage proportional to the charge
or AC voltage input, and it is designed to be powered by 90-240 VAC (9-18 VDC option also
available).
The Endevco Model 133 Signal Conditioner has a fixed 10 Hz 4-pole Butterworth high-pass filter
that can be selected or bypassed. It has a plug-in 4-pole low pass filter whose corner can be set
by an internal header module, which offers optional filter types and multiple corner frequencies.
{See Section 2.4.8 Filter Options and Installation and Appendix 1, (Endevco Model 31875-XXXX-
Y)}. Filter options are available to meet the filter corner requirements for J211 and ISO6487. The
specific filter corners available are: 300 Hz and 1,650 Hz (see Section 2.4.8 Filter Options and
Appendix 1.)
Up to three (3) Model 133 units can be installed in a 19” rack using ENDEVCO Model 31979 Rack
Mounting Kit.
Figure 4 shows a detailed circuit block diagram for the unit.
1.3
FUNCTIONAL CHARACTERISTICS
The Endevco Model 133 can be manually programmed from the front panel (Figure 1) by means
of a “Select Channel” push-button, three (3) “Channel LEDs”, a “Select Function” push-button,
seven (7) “Function LEDs” indicating which function has been selected by the “Select Function”
push-button (referred to in this document as the “function LEDs”), a four (4) character LED display
to show the state of each function, four (4) “EDIT” push-buttons to change the entries in the LED
display, and three (3) LEDs indicating if there are any faults in any of the channels (referred to in
this document as the “Fault LEDs”).
The unit has two modes of operation: (1) Normal and (2) Query/Programming. In the Normal mode
of operation, the unit can be in (a) Monitoring State, or (b) No-Monitoring State. While in the Normal
mode of operation, the selected state will apply to all three channels simultaneously.
The unit will store the settings for all of the function in its internal memory and at power-up it will
automatically restore the settings from the last session.
1.4
KEY FEATURES
The following are some of the highlight features:
•
Three-channel piezoelectric/ISOTRON signal conditioner
•
200 kHz Bandwidth (-3dB corner)
•
10 Volt Full Scale Output
•
Built-in 10 Hz 4-pole Butterworth High Pass Filter
•
Fault indicator for open/short at the ISOTRON input
•
Gain range from 0 to 1000
•
RS-232 Serial Interface
•
Optional Low Pass filter corners available (Butterworth - the standard default filter is a 10
kHz Butterworth)
•
Meets filter requirements of J211 and ISO6487.
