Cal Test CT3688A User Manual
Active Differential Probe Kit, 200 MHz, 10x Small Signal ±20V
CT3688A
USER MANUAL
CAL TEST ELECTRONICS
CT3688A Active Differential Probe Kit, User Guide
© Cal Test Electronics. All rights reserved.
Cal Test Electronics products are covered by US and foreign patents, issued
and pending. Information on this publication supersedes all earlier versions.
Specications are subject to change without notice.
Made in Taiwan
SYMBOLS AND TERMS
The following symbols may appear on the product or in the documentation.
Caution Symbol (ISO 7000-0434) – Statements or instructions
that must be consulted in order to nd out the nature of the
potential hazard and any actions which must be taken.
Caution, possibility of electric shock Symbol (IEC 604027-
6042) - To identify equipment that has the risk of electric shock.
A statement calling attention to an operating procedure,
WARNING
CAUTION
WARNING
practice, or condition, which if not followed correctly, could result
in damage to or destruction of parts or the entire product.
A statement calling attention to an operating procedure,
practice, or condition, which if not followed correctly, could result
in injury or death to personnel.
DEFINITIONS
POLLUTION (P) – addition of foreign matter solid, liquid or gaseous (ionized
gases), that may product a reduction of dielectric strength or surface
resistivity.
• Degree 2 (P2) – only non-conductive pollution occurs except that
occasionally a temporary conductivity caused by condensation is
expected.
MEASUREMENT CATEGORY (CAT) – classication of testing and measuring
circuit according to the type of mains circuits to which they are intended to
be connected.
• MEASUREMENT CATEGORY other than II, III, or IV: - measuring
circuits that are not directly connected to the mains supplies.
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GENERAL SAFETY INFORMATION
Safety is compromised if instructions are not read, understood, and followed.
• Disconnect from all devices and sources before attaching test leads or
adapters.
• Check for damage before usage - Do not use if any part is damaged.
• Do not use in wet or explosive atmospheres.
CAUTION
CAUTION
WARNING
WARNING
WARNING
WARNING
WARNING
WARNING
Do not install substitute parts or perform any
unauthorized modication to the probe.
This probe is not authorized for use in contact with the
human body or for use as a component in a life-support
device or system.
Never exceed the maximum voltage or measurement
category of the probe and adapter assembly as
congured for usage.
Never remove the probe’s casing as this may expose you
to electric shock. If necessary, disconnect the inputs and
outputs of the probe before opening the case.
To avoid injury, remove jewelry such as rings, watches,
and other metallic objects. Do not touch exposed
connections and components when power is present.
Hazardous voltages may be present in unexpected
locations in circuitry being tested when a fault condition
in the circuit exists. Capacitors inside the instrument may
retain a charge even if the instrument is disconnected
from its source of supply.
Do not operate this probe from a power source that
applies more than the voltage specied.
This probe must be grounded by the shell of the BNC
connector through the grounding conductor of the power
cord of the measurement instrument. Before making
connections make sure the measurement instrument is
properly grounded. Whenever it is likely that the ground
protection is impaired, you must make the instrument
inoperative and secure it against any unintended
operation.
• If the probe is used in a manner not specied by this user guide, the
protections provided may be impaired.
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DESCRIPTION
Dierential probes allow safe, accurate measurement between two voltage
points where neither point is referenced to ground. The CT3688A oers a 200
MHz bandwidth and can test up to ±60 V (DC + AC peak). Compatible with
oscilloscopes from all major manufacturers, the probe can be battery operated
or powered directly from an oscilloscope using the included USB cable.
Features:
• Meets IEC 61010-031 safety standard
• Small compact size
• Up to ±20 V dierential
• High accuracy ±1%
• 200 MHz bandwidth (-3 dB)
• Excellent CMRR
• Kit comes in foam-lined plastic case and contains:
• Dierential probe
• (2) Sprung hook probes,1000 V, CAT III, 20 A (black & red)
• (2) Alligator clips, 300 V, CAT II (black & red)
• 9 V Battery
• USB Power Cable
This probe is tested prior to shipment. It is therefore ready for immediate use
upon receipt. An initial physical inspection should be made to ensure that no
damage has been sustained during shipment.
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