|
 The
single-channel Model 4040 is used for measurement of flow, rpm, and other
phenomena that can be sensed by pulse transformer transducers with
two-wire isolated windings (tachometer pickups, turbine flowmeters, etc.),
transistor or logic-circuit drivers, "zero-velocity" (true
digital output) sensors, and similar frequency-generating transducers.
This
instrument accepts an exceptionally wide range of waveshapes and voltage
levels. Its analog-input threshold level is selectable to
accommodate signals from 250 mV to 100 V, thus guaranteeing reliable
triggering when the input is at the low end of the frequency
range.
Capacitive
coupling of 0.1 μF and/or 10 μF is provided for low-frequency
inputs, to eliminate false triggering by signal noise or any DC offset
(positive or negative) that exists for the frequency signal. For
"zero-velocity" sensors, nominal ±5 VDC excitation is supplied.
When
you know the manufacturer-supplied full-scale rating of the frequency
source (or the highest frequency expected to be measured), the Model 4040
can be quickly and easily calibrated by issuing a special FREQUENCY
CALIBRATION (FRQ) command through the Interface Port or optional Model
10P80D Extended Keyboard. A precise 2.048000-MHz crystal
frequency reference ensures accuracy of all calibrations.
|
Functions
Provided by the
MODEL 4040
"STANDARD
CONFIGURATION"
(for
a complete listing of the configuration, click
here) |
 |
A
preprogrammed tare function may be activated by front-panel
button |
|
Via
front-panel buttons, you can call to display the
"live" tared input; the maximum (most
positive) value of that input since last reset; the minimum
(least positive) value of that input since last reset; or the
existing net difference between these maximum and minimum
values |
|
The
"MAX" and "MIN" functions can be reset by a front-panel
button |
|
Each of the standard
seven predefined limit
zones of the tared input reading is tied to a specific nonlatching logic output |
|
The
4040's ±10
VDC analog output derives from the
tared analog input, and is initially scaled for 1 mV of output per
10 Hz |
|
For
a 4000 Series instrument based on both the Model 4040 and the Model
4078 AC Strain Gage Instrument, and dedicated to the measurement
of torque, rpm, and horsepower, see the Model
4K/HP Horsepower Instrument.
For
typical 4040 operations, see the following applications:
Frequency
Instrument Specifications [Top 
]
(Click
here for
4000 Series General
Specifications; see also
the statement
on Daytronic accuracy specifications)
|
|
Number
of Inputs |
One |
|
Input
Type |
Any
AC or unipolar pulse signal, grounded or floating, irrespective of
waveform |
|
Frequency
Range |
From
5% to 100% of 250, 500, 1000, or 2000 Hz; from 2% to 100% of 4, 8, 16, or
32 Hz |
|
Threshold
Level |
Selectable
to accommodate signals from 250 mV to 100 V |
|
Excitation
Supplied (for "Zero-Velocity" sensors) |
Nominal
±5 VDC; ±50 mA maximum |
|
Normal-Mode
Range |
±100
V operating; ±200 V without instrument damage |
|
Common-Mode
Range |
±100
V operating and without instrument damage |
|
Common-Mode
Rejection Ratio |
-120
dB at 60 Hz; -60 dB at 1 kHz |
|
Input
Impedance |
Differential:
400 kΩ
Common-Mode: 100 kΩ |
|
Offset |
Initial:
±0.05% of full scale
Vs. Temperature: ±25 ppm/°C
Vs. Time: ±20 ppm/month
|
|
Gain
Accuracy |
±0.02%
of full scale ± 1 count LSD |
|
Gain
Stability |
Vs.
Temperature: ±40 ppm/°C
Vs. Time: ±20 ppm/month
|
|
Analog
Filtering |
|
Filter |
5-pole
modified Butterworth, with characteristics selectable as "1,"
"2," or "3," as follows:
(1) -3 dB at 10 Hz; -60 dB at 75 Hz
(2) -3 dB at 5 Hz; -60 dB at 35 Hz
(3) -3 dB at 2.5 Hz; -60 dB at 20 Hz
|
|
Step
Response Settling Time (Full-Scale Output) |
(1)
To
1% of final value: 40 ms
To 0.1% of final value: 90 ms
To 0.02% of final value: 150 ms
(2)
To
1% of final value: 65 ms
To 0.1% of final value: 135 ms
To 0.02% of final value: 220 ms
(3)
To
1% of final value: 150 ms
To 0.1% of final value: 30 ms
To 0.02% of final value: 450 ms
|
|
Ripple
and Noise |
Readings
are within the stated accuracy from
(1) 30% to 100% of the frequency range in use
(2) 15% to 100% of the frequency range in use
(3) 10% to 100% of the frequency range in use
|
|
