Monarch Instrument Nova-Strobe vbx - Manual (Page 5)

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1.0 OVERVIEW
The Nova-Strobe vbx is a truly portable, battery-operated stroboscope
that is suited for a wide range of industrial, institutional, and educational
applications, and is able to interface with several of the Vibration Data
Collectors that are currently available. Several interface cables are available.
Sturdy and compact, the strobe can be operated anywhere in the plant or
field to permit visual inspection (freeze motion), phase shift studies, and
digital measurement of rotary, reciprocating, or linear motions of various
equipment while it is in operation.
The Nova-Strobe vbx has a special “tuning” circuit that allows it to track
vibration transducer (accelerometer) signals. This capability makes it
different from general-purpose strobe lights. It also has a Narrow and Wide
Bandwidth filter selection to discriminate fundamentals from harmonics.
The Narrow Bandwidth filter limits the influence of harmonics around the
selected frequency, providing a more stable phase reading.
The Nova-Strobe vbx requires an input signal to synchronize the flash rate
with an external source, typically a vibration transducer in the tracking
mode or optical pickup in the external mode. This signal is applied, using a
special cable, to the Input (S pointing into socket) jack connector on the
side of the strobe light. The Nova-Strobe vbx generates a tachometer signal
that is on the Output (T pointing away from socket) jack. Information
about the use of these signals is given in other sections of this manual.
Special adapter cables are available to suit several commercially available
Vibration Analyzers.
The Nova-Strobe vbx is ideally suited for:
1. Balancing
2. Inspection of High Speed Rotating Parts
3. Motion Analyses, or Phase Shift Measurement
4. Over speed Trip Tests
5. Online coupling Inspections
6. RPM/RPS Measurements
9.0 SPECIFICATIONS
Internal Mode:
Flash Range
30 - 50,000 FPM (Flashes Per Minute)
Flash Rate Accuracy 0.004% of setting or ± last digit
Flash Rate Resolution 0.01 to 1 FPM (menu selectable), 0.1 FPM
max resolution above 9,999.99 FPM
Display Update Rate Instantaneous
External Modes:
Flash Range and Display same as internal mode - External flash rates to
0 are acceptable
Tachometer Measurements 5 to 250,000 RPM
Accuracy: ±0.001% of reading or ± last digit
Display Update Rate 0.5 second typical
Trigger to Flash Delay 5 µsec typical
Phase Delay Phase: 0.1 to 359.9 degrees, Time: 0.01 to 1000
milliseconds, Auto: 0 to 200 VRPM
External Input TTL Compatible (24V pk max), 500 nanosec min pulse
width, Positive or Negative edge triggered (menu selectable)
Tracking (Accelerometer) Mode:
Flash Range
100 - 50,000 FPM (Flashes Per Minute)
Tachometer Measurements 100 to 50,000 RPM
Accuracy: ±1 RPM
Display Update Rate 0.5 second typical
Trigger to Flash Delay 5 µsec typical
Phase Delay Phase: 0.1 to 359.9 degress, Time: 0.01 to 1000
milliseconds, Auto: 0 to 200 VRPM
Tracking Filter Selectable Wide and Narrow Bandwidths. The filter
may not lock below 100 FPM
External Input 10 or 100 mV/g accelerometer sensitivity (menu selectable)
Positive or Negative edge triggered (menu selectable)
Accelerometer Power 18 Vdc ±10% @ 2mA (menu selectable: on=yes, off=no)
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