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Field Tools
Pulse Scope
Installation
Operation &
Specifications
Manual
General Description
TM
101-0012
Pulse Scope is a USB oscilloscope designed to aid fi eld service technicians and
engineers with troubleshooting pulse or frequency related equipment. Use Pulse
Scope to test PLC digital inputs and outputs, fl ow meters with pulsed outputs,
speed sensors, and more. Pulse Scope’s simplicity and portability allows you
to quickly visualize and measure waveform features. Actually seeing the
waveform can help locate possible voltage level or pulse width issues making
your system more reliable.
• Can be set to wait and capture a single pulse event with long delays
between events (Single Sweep)
• Quickly measure max voltage, minimum voltage, peak-peak voltage, positive
width, negative width, period, frequency, and duty cycle
• Count pulse events over extended time periods with a maximum count of
over 4 billion pulses
• Trigger on rising or falling pulse edge to increase measurement accuracy
620-0006 R1 © Microfl ex 2009
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Safety Considerations
Warning - Non Isolated Input
Pulse Scope does not provide electrical isolation between the USB port and
the pulse input leads. USB ground and the pulse input black lead are at the
internally connected. Connecting to a signal at a different ground potential
than the USB ground could damage equipment.
Observe Input Voltage Limits & Polarity
Exceeding the pulse input voltage levels, or connecting in reverse polarity
may permanently damage the device. Pulse Scope is designed for low
voltage pulses less than 30 volts peak to peak.
Connecting Pulse Scope to your computer
Pulse Scope uses the Human Interface Device (HID) class driver. The HID
driver is included as a part of the Windows operating system and no third party
device driver is required. When you connect the Pulse Scope to your computers USB port, your computer will automatically detect it and confi gure the
necessary software. Power for Pulse Scope is taken from the USB port and no
external power source is necessary.
Software Requirements
• Windows® 7, Vista, or XP
• Windows .NET Framework 2
• 3MB Disk Space
• USB 2.0 Port
• CD/DVD Drive to install the software
Software Setup
To install the Pulse Scope software run setup.exe from the CD and follow the
on-screen prompts. The setup utility (setup.exe) will auto-run when the CD
is inserted in your CD drive if this feature is enabled on your computer. The
required .NET framework will also be installed if it is not already installed on
your computer.
Running the Software
With Pulse Scope connected to a USB port, run the software by either clicking
on the Pulse Scope icon on your desktop or by choosing it from
Start > All Programs > Microfl ex > Pulse Scope.
Pulse Scope Icon
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Program Features
6 7
5
10
8
9
The yellow line is the measured value plotted with time as the horizontal scale and
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volts as the vertical scale.
The green line is for visualization of how the measured pulse would relate to an
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upper trigger level of a device that the pulse connects to. Measured pulse voltages
should be higher than the green line to ensure that the device the pulse is driving will
see a high logic level. The actual value is set using the Setup > Trigger menu or by
pressing F4. See the Trigger Settings section in this manual for details.
The red line is for visualization of how a measured pulse would relate to the lower
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trigger level of the device that the pulse connects to. Measured pulse voltages should
fall lower than the red line to ensure that the device the pulse is driving will see a low
logic level. The actual value is set using the Setup > Trigger menu or by pressing
F4. See the Trigger Settings section in this manual for details.
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1
2
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The pulse scope internal trigger voltage level. Input voltages must cross this voltage
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before the measured pulse edge can be synchronized. Also, the pulse count (item 6)
will increment as the pulse edge crosses the trigger voltage. The value is determined
by a comparison of the upper and lower trigger levels (green and red lines).
Selects, and shows, which pulse edge (rising or falling) to use for synchronization. A
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green dot will appear on the button when the input is synced.
Displays the total number of pulses counted since the last count reset. When the trig-
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ger edge is set to rising, the count is incriminated when the input voltage increases
past the trigger voltage. When the trigger edge is set to falling, the count is incriminated when the input voltage falls below the trigger voltage.
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Resets the pulse counter.
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Increases the voltage scale.
8
Decreases the voltage scale.
9
Indicates the active volts scale in reference to the available scales.
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Decreases the time scale and reduced the time between voltage samples.
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Increases the time scale and increases the time between voltage samples.
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Indicates the active time scale in reference to the available scales.
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Stop acquiring data.
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Run or start acquiring data.
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Trigger Settings
To change the trigger settings choose Setup > Trigger from the top pull-down
menu or press F4 to open the Trigger Settings dialog.
Auto Acquire
In auto acquire mode Pulse Scope
will look for a pulse edge to sync
the frame. If a trigger edge is not
detected after a short delay, a frame
of data (100 voltage samples taken
at the active sample rate) will be
acquired. Auto is best when the time
between pulses is short enough that
a new trigger edge can be detected
without sync loss. If there is a long
delay between pulse edges, try using
the normal acquire mode for a more
stable sync.
Normal Acquire
In normal acquire mode Pulse Scope will not start acquiring data until a trigger
edge is detected. Normal is best when there is a long delay between pulse edges
because the Pulse Scope will wait for the pulse event before acquiring the frame.
Normal + Single Sweep Acquire
Single sweep is only available when normal is selected. It functions the same
as normal but stops acquiring after one sweep. To acquire a frame press the run
button.
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Trigger Edge
Selects whether to trigger or sync the frame when the pulse voltage is increasing
(Rising) or when the pulse voltage is decreasing (Falling).
Trigger Levels
The voltages to use for trigger levels (green and red lines) should be taken from
the data sheet or manual for the pulse or digital input that the pulsing device will
connect to. Using the actual values that your equipment uses will provide an accurate visual representation to reveal if the pulse displayed by Pulse Scope will
cross the trigger levels used by your digital or pulse input. If High and Low are
set to the same voltage, the red line will be drawn over the green line and only
red will be visible.
If these values are unknown, choose a voltage that is approximately between the
maximum and minimum measured voltages (Vmax and Vmin).
The Pulse Scope Internal Trigger level is automatically selected to be between
the High and Low voltage levels. Pulse scope only has a few values it can use
for the internal trigger and determined from the High and Low settings.
View Measurements
To view the pulse measurements choose Setup > View Measurements from the top
pull-down menu. Choosing this menu item again will hide the measurements.
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Getting Started
With the Pulse Scope connected to a USB port and the software running, connect the black lead to the (-) side and the red lead to the (+) side of the signal
you would like to measure. It is important to remember that Pulse Scope does
not provide isolation between the USB port and input leads. Consider this when
you connect the black lead to your equipment. In most cases you can connect the
black lead to the power supply return or ground.
Start with the default scales and trigger settings then adjust the scales to fi t the
measured waveform on the chart. Make sure there are no errors due to slow sample rates be reducing the time scale (see Sample Rate Errors below) as a quick
check before taking measurements.
When viewing measurements – some measurements will only show when the
pulse is synced and at least two pulses are visible.
Sample Rate Errors
Pulse Scope builds a visual representation of the measured waveform by taking
voltage readings of the input signal at evenly spaced sample intervals - 100
samples per frame. The sample interval depends on the time scale. If the sample
interval is too slow, it is possible for the Pulse Scope to provide a waveform that
is not representative of the true waveform. Reducing the time scale will decrease
the time between samples (sample interval).
In the illustration below (a), the sample interval is too slow for the waveform.
The two pulses fall between samples causing a sample rate error. Always reduce
the time scale (faster sample interval) to make sure there are no sample rate errors before taking measurements (b).
(a) Sample rate error caused by slow sample
interval. Hi pulse levels are not sampled
because time between samples is too long.
(b) Fast sample interval (reduced time scale)
provides more samples and reduce errors.
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Pulse Scope Specifications
USB
Connector .........................................................................................USB-A
Standard Cable Length .................................................... 6 Feet (2 Meters)
Compatibility .................................................................................. USB 2.0
Scope Input
Leads ................................3 Feet (1 Meter) High Flexibility Test Lead Wire
Termination ......Confi gurable (Alligator Clips, Spade Terminals, or Probes)
Input Voltage Range ................................................................0 to 30 Volts
Input Frequency Range .......................................................... DC to 10Khz
Resolution ...........................................................................................8-bits
Accuracy ................................................................................ ±5% of Scale
Input Impedance ............................................................................ >500KΩ
Volt Scales ...................................................... 5V, 10V, 15V, 20V, 25V, 30V
Time Scales;
Time
Scale
1 10uS 1mS
2 25uS 2.5mS
3 50uS 5mS
4 100uS 10mS
5 250uS 25mS
6 500uS 50mS
7 1mS 100mS
8 2.5mS 250mS
9 5mS 500mS
10 10mS 1S
Sample
Interval
Frame
Width
Pulse Counter
Maximum Count ........................................................................... 4.2 billion
Pulse Count Rate ........................................... 0 to 100K pulses per second
Enclosure
Molded ABS Plastic
Weight (including USB cable) .......................................................5 ounces
Pulse Scope Dimensions ...............................................1.38” x 2.36” x 0.8”
Environmental
Operating Temperature ...............................-30ºC to 50ºC (-22ºF to 122ºF)
Storage Temperature .................................. -40ºC to 70ºC (-40ºF to 158ºF)
Humidity ............................................................0 to 95% (non-condensing)
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Limited Warranty
Microfl ex, LLC warrants this unit against defects in materials and
workmanship for a period of one year from the date of shipment. Microfl ex,
LLC will, at its option, repair or replace equipment that proves to be defective
during the warranty period. This warranty includes parts and labor.
A Return Authorization (RA) number must be obtained from the factory
and clearly marked on the outside of the package before equipment will be
accepted for warranty work.
Microfl ex, LLC believes that the information in this manual is accurate. In the
event that a typographical or technical error exist, Microfl ex, LLC reserves
the right to make changes without prior notice to holders of this edition.
The reader should consult Microfl ex, LLC if any errors are suspected. In no
event should Microfl ex be liable for any damages arising out of or related to
this document or the information contained in it.
EXCEPT AS SPECIFIED HEREIN, MICROFLEX, LLC MAKES
NO WARRANTIES OR MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE. CUSTOMER’S RIGHT TO RECOVER
DAMAGES CAUSED BY FAULT OR NEGLIGENCE ON THE PART
OF MICROFLEX, LLC SHALL BE LIMITED TO THE AMOUNT
THERETOFORE PAID BY THE CUSTOMER. MICROFLEX, LLC
WILL NOT BE LIABLE FOR DAMAGES RESULTING FROM
LOSS OF DATA, PROFITS, USE OF PRODUCTS, OR INCIDENTAL
OR CONSEQUENTIAL DAMAGES, EVEN IF ADVISED OF THE
POSSIBILITIES THEREOF . This limitation of the liability of Microfl ex will
apply regardless of the form of action, whether in contract or tort, including
negligence. Any action against Microfl ex, LLC must be brought within
one year after the cause of action accrues. The warranty provided herein
does not cover damages, defects, malfunctions, or service failures caused by
owners failure to follow Microfl ex’s installation, operation, or maintenance
instructions; owners modifi cation of the product; owner’s abuse, misuse, or
negligent acts; and power failure or surges, fi re, fl ood, accident, actions of
third parties, or other events outside reasonable control.
Microfl ex, LLC
2202 Red Bird Lane
Brookshire, Texas 77423
USA
Phone 281-855-9639
Fax 832-422-4391
www.microfl x.com
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