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These
instruments accept any type of AC or pulse input signal,
single-ended or differential, irrespective of waveform. Each
instrument produces one standard 5 VDC output (see Specifications),
each precisely proportional to the frequency of the
source.
These
conditioners are useful for measuring rpm, flow, and other
phenomena that can be sensed by frequency-generating devices like
magnetic pickups or turbine flowmeters (see the applications
listed below).
The
Model 3140A Frequency Conditioner is the basic "Form
1" instrument.
The
Model 3240A Frequency Conditioner / Indicator is the "Form
2" instrument, providing vivid front-panel digital
indication of measured values, scalable in desired engineering
units.
The
Model 3340A Frequency Conditioner / Indicator /
Controller is the "Form
3" instrument, and includes HI/LO limit
detection. This feature is useful in various control and
safety alarm functions (e.g., shaft overspeed, low oil flow,
etc.). |
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A
wide selection of frequency ranges accommodates virtually any mechanical
measurement requirement. Input sensitivity level is continuously
adjustable via front-panel control.
A
simple procedure, using an internal crystal reference oscillator and
adjustable span controls, allows precise calibration in terms of
frequency, rpm, gallons per hour, or any other appropriate unit. An
auxiliary excitation supply of -9 VDC is available on the rear connector.
For
typical 3140A/3240A/3340A operations, see the following
applications:
3000
Series options applying to these instruments include
Frequency
Instrument Specifications [Top 
]
(Click
here for 3000 Series General Specifications)
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Input
Type |
Any
AC or unipolar pulse signal, floating or grounded, irrespective of
waveform |
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Input
Threshold Level |
Automatic
triggering at 75% and 25% of the input amplitude |
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Input
Ranges (full-scale) |
Switch-selectable
0 to 100, 200, 500, 1000, 2000, 5000, 10000, 20000, or 50000 Hz |
|
Sensitivity
(full-scale) |
Continuously
adjustable from 0.1 to 200 V* |
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Excitation
Supplied |
-9
VDC auxiliary supply available on rear connector |
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Analog
Output |
One
output, ±5 VDC full-scale with 50% overrange, 5 mA maximum; low-pass corner
frequency of 2 Hz for 100, 200, and 500 Hz ranges; 10 Hz for all other
ranges |
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Output
Ripple and Noise |
Less
than 0.1% of full scale from 20% to 100% of the selected range |
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Step-Function
Response Time (to 99% of final full-scale value) |
1.8
sec for 100, 200, and 500 Hz ranges; 350 msec for all other ranges |
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Accuracy
(typical, following calibration) |
0.05%
of full scale |
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Display
Resolution (Models 3240A and 3340A) |
0.02%
of full scale |
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*
Input sensitivity decreases above 10 kHz by 0.01 V/kHz (to 0.5 V at 50
kHz). |
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