Model 133 PE and Isotron® signal conditioner Features • Three-channel PE/Isotron® signal conditioner • 100 kHz bandwidth (-3dB Corner) • Built-in 4-pole Butterworth high-pass filter with optional corner frequencies • Gain range 0 to 1000 • RS-232 serial interface • 12 VDC power option • Meets filter requirements of J211 and ISO 6487* The Endevco® model 133 is a three-channel, Piezoelectric and Isotron signal conditioner that is manually or computer programmable. Manual control is accomplished at the front panel by means of a “Select Channel” push-button, three (3) “Channel LEDs”, one “Select Function” push-button, seven “Function LEDs”, a four character LED display, showing the state of each function/channel, and four “Edit” push-buttons to change the entries in the LED display. There are three LEDs used as fault status indicators for open/short at the Isotron inputs. Computer control is accomplished using the standard RS-232 port and optional application software. There are two modes of operation, Normal and Programming/Setup. Both modes of operation utilize the front panel LED display. In the Normal Mode, there are two states, Monitoring and Non-Monitoring. In the Monitoring state the LED display indicates the RMS valve (±10%) of the signal present at the output of the selected channel. The Non-Monitoring state turns off the LED display for lower noise applications and to minimize power consumption. In the Programming Mode, the unit is ready for manual programming of existing channel setups. The unit will automatically return to the Normal Mode of operation after 20 seconds of inactivity of the front panel or after pressing the “Select Function” pushbutton while the “Monitoring State” function LED is flashing. The rear panel contains an RJ-11 connector for the RS-232 serial communications port, an input power connector, and on a per-channel basis, a BNC output connector, a 10-32 input connector for the PE input, and a BNC connector for the Isotron input. Three model 133 units may be installed in a 19-inch rack mount adapter. The standard unit is powered by 90-264 VAC, 50/60 Hz. The -1 option is powered by 9 to 18 VDC, making it ideal for portable use in automobile test applications. Charge Convertor (0.303 mV/pC) Gain = 3 24 VDC ISOTRON INPUT Programmable Gain: 0 to 100 4-Pole Butterworth Low-Pass Filter or Other Options Technical Drawing

Model 133 PE and Isotron® signal conditioner Specifications The following performance specifications conform to ISA-RP-37.2 (1964) and are typical values, referenced at +75˚F (+24˚C) and 100 Hz, unless otherwise noted. Calibration data, traceable to National Institute of Standards and Technology (NIST), is supplied. Piezoelectric Maximum charge input Source resistance Source capacitance Isotron Constant excitation current Accuracy Compliance voltage Maximum input voltage Input impedance AC voltage Maximum linear output Display non-linearity Maximum current output DC offset Protection Single-ended...