Caltest CT4192 User manual

CT4192
User Manual

450866-001 Rev. B caltestelectronics.com 1
Safety Summary
To avoid personal injury and/or product damage, review and comply with
the following safety precautions. These precautions apply to both operating
and maintenance personnel and must be followed during all phases of
operation, service, and repair of this probe.
A WARNING statement calls attention to an operating procedure,
practice, or condition, which, if not followed correctly, could result in injury
or death to personnel.
A CAUTION statement calls attention to an operating procedure, practice,
or condition, which, if not followed correctly, could result in damage to or
destruction of parts or the entire product.
Do Not Work Alone
Do not work alone when working with high voltages.
Inspect the Probe
Inspect the probe and accessories for cracks and frayed or broken leads
before each use. If defects or damages are noted, DO NOT USE the
probe.
Dry Conditions
Hands, shoes, oor, and work bench must be dry. Avoid making
measurements under humidity, dampness, or other environmental
conditions that might affect safety.
Do Not Remove the Probe’s Casing
Removal of the probe’s casing may expose you to electric shock. If
necessary, disconnect the inputs and outputs of the probe before opening
the case.
Hazardous Contact
To avoid injury, remove jewelry such as rings, watches, and other metallic
objects. Do not touch exposed connections and components when power
is present.
Unexpected Charges
Hazardous voltages may be present in unexpected locations in circuitry
being tested when a fault condition in the circuit exists.

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Capacitors inside the instrument may retain a charge even if the instrument
is disconnected from its source of supply.
Use Only in Ofce-Type Indoor Setting
The probe is designed to be used in ofce-type indoor environments. Do
not operate the probe:
zIn the presence of noxious, corrosive, flammable fumes, gases,
vapors, chemicals, or finely-divided particulates.
zIn environments where there is a danger of any liquid being
spilled on the probe.
zIn air temperatures exceeding the specified operating
temperatures.
zIn atmospheric pressures outside the specified altitude limits or
where the surrounding gas is not air.
Not for Critical Applications
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.
Do Not Substitute Parts
Do not install substitute parts or perform any unauthorized modication to
the instrument.
Only Qualied Personnel
Only qualied personnel should use this probe. This differential voltage
probe is designed to be used by personnel who are trained, experienced,
or otherwise qualied to recognize hazardous situations and who are
trained in the safety precautions necessary to avoid possible injury when
using such a device.
Observe Maximum Working Voltage
Do not use the CT4192 probe above its maximum working voltage ranges.
See “Electronic Characteristics” on page 8.
Use Proper Power Source
Do not operate this probe from a power source that applies more than the
voltage specied.

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Must be Grounded
This probe is grounded by the shell of the BNC connector through the
grounding conductor of the power cord of the measurement instrument.
Before making connections to the input leads of this probe, ensure
that the output BNC connector is attached to the BNC connector of the
measurement instrument, and that 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.
Compliance Statements
Disposal of Old Electrical & Electronic Equipment
(Applicable in the European Union and other European
countries with separate collection systems). This product is
subject to Directive 2012/19/EU of the European Parliament
and the Council of the European Union on waste electrical
and electronic equipment (WEEE), and in jurisdictions
adopting that Directive, is marked as being put on the market
after August 13, 2005, and should not be disposed of as
unsorted municipal waste. Please utilize your local WEEE
collection facilities in the disposition of this product and
otherwise observe all applicable requirements.
This probe is in compliance with IEC-61010-031 CAT II, Pollution Degree
2.

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1 Introduction
Overview
Differential probes allow safe, accurate measurement between two
voltage points where neither point is referenced to ground. The
CT4192 offers a 70 MHz bandwidth. Compatible with oscilloscopes
from all major manufacturers, the probe can be battery operated, or
powered by the optional 9 V adapter (CT3723).
Features
zMeets IEC 61010-031 safety standard
z70 MHz bandwidth (-3dB)
zUp to ±700 V (DC + AC peak) common mode
zSelectable attenuation settings of 10x/100x
zPower indicator
zHigh accuracy (±1%)
zPowered by 4 AA batteries (included)
zPower adapter, CT3723 (optional)
Initial Inspection
This unit 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. After
the inspection, verify the contents of the shipment. The included
accessories for this product are:
zDifferential probe
z(2) Hook probes, black & red
z(4) AA batteries
zOffset adjustment tool
zUser manual

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2 Product Overview
CT 4192 Description
CT4192
1 M
Hook probes,
black and red
Attenuation Function Switch
Output BNC Connector
Power On/Off
Switch
Power Indicator (Red)
Offset Adjust
External Power Connection
Figure 1 Front Panel Features
Leads,
black and red
Rubber boot

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3 Using the Probe
Power Connection
Take the rubber boot off of the probe. Slide open the battery
compartment and insert 4 AA batteries, being sure to match polarity
with the printed indicators inside the compartment. Then Slide the
cover back and replace the rubber boot. See Figure 2.
AA
AA
AA
AA
Figure 2 Battery Connection
Alternatively, connect the 9 VDC power adapter to the power jack on
the probe. See Figure 3. Connect power adapter to an appropriate
voltage source.
Power
Jack
Figure 3 Power Jack

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Getting Started
1. Connect the BNC output connector to the vertical input of
a general purposed oscilloscope or other measurement
instrument. The measurement instrument must have a ground
referenced.
2. Connect power source.
3. Select the proper attenuation ratio. When measuring signals
below 70 V, switch the attenuation ratio to 10x in order to get
higher resolution and less noise ratio. For voltages up to 700 V,
set the attenuation ratio to 100x.
4. Plug the hook probes onto the test leads and connect the circuit
to be tested.
5. Slide the power switch on the probe to the “ l ” position. The
indicator will light up.
CAUTION
This probe is used to carry out differential measurements between
two points on the circuit under test. This probe is not designed for
electrically insulating the circuit under test or the measuring instrument.

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Vertical Scale on Oscilloscope
The actual vertical scale of the oscilloscope is equal to the attenuation
factor multiplied by the range of vertical scale selected on the
oscilloscope. For example, with the probe on factor 10x and the
oscilloscope on 0.5 V/div, the real vertical scale is 10 x 0.5 = 5 V/div.
With the probe on 100x, the real vertical scale is 100 x 0.5 = 50 V/
div. These values apply when the oscilloscope is set to the typical 1
MΩ impedance input. When the scope is set to 50 Ω input, the actual
vertical scale will be doubled: 10 V/div for the 10x setting and 100 V/div
for the 100x setting. See the chart below.
Vertical Scale on Oscilloscope
Scope Input
Impedance
Probe
Attenuation
Setting
Actual
Attenuation
Setting
Vertical Scale
Reading on the
Oscilloscope
Actual Vertical
Scale of the
Oscilloscope
1 MΩ 10x 10x 0.5 V/div 5 V/div
1 MΩ 100x 100x 0.5 V/div 50 V/div
50 Ω 10x 20x 0.5 V/div 10 V/div
50 Ω 100x 200x 0.5 V/div 100 V/div
Table 1 Oscilloscope Readings

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Offset Zero Procedure
The CT4192 can be adjusted to zero the probe’s offset voltage
using the offset adjustment tool supplied with the probe. Follow this
procedure to perform the offset adjustment.
1. Connect the probe to Channel 1 of the oscilloscope. Turn on the
probe power. You may use the CT3723 or batteries to power the
probe. Set the probe attenuation ratio to the low setting.
2. Short the + and - probe inputs together with the hook tips.
3. Turn on power to the oscilloscope. Leave both the instrument
and the probe turned on for 30 minutes to stabilize.
4. Press [Default Setup] and [Auto] on the oscilloscope.
5. Press the Channel 1 button, then press the probe softkey and
set the attenuation to match that of the probe.
6. Set the oscilloscope to DC coupled mode and then the trace on
the scope to 0 volts.
7. If possible, set the oscilloscope to average mode (x16) or high-
resolution mode to reduce oscilloscope noise.
8. Using the offset adjustment tool (included), adjust the probe
offset voltage to 0 volts.
4 Cleaning
This probe does not require any particular cleaning. If necessary, clean
the case with a soft cloth.
WARNING
Dry the probe thoroughly before attempting to make voltage
measurements.
CAUTION
Avoid immersing or using abrasive cleaners or solvents containing
Benzene (or similar solvents) on the probe as these can cause
deterioration of the probe body and cables.

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5 Specications
All specications apply to the unit after a temperature stabilization time
of 20 minutes over an ambient range of 25 °C ± °C.
Electrical Characteristics
Bandwidth 70 MHz
Rise Time 7.5 ns
Attenuation 10x/100x
Accuracy ±1%
AC CMRR
-80 dB @ 50 Hz
-60 dB @ 20 kHz
-46 dB @ 1 MHz
-40 dB @ 10 MHz
Maximum Differential
Input Voltage
(DC + AC peak)
±70 V @ 10x
±700 V @ 100x
Maximum Common-
Mode Input Voltage (DC
+ AC peak)
±70 V @ 10x
±700 V @ 100x
Absolute Max Rated
Input Voltage (each side
to ground)
1000 Vrms
Input Resistance //
Capacitance 4 MΩ // 5.5 pF (each side to ground)
Output Voltage Swing ±7 V (driving 1 MΩ oscilloscope input)
Offset (typical) ±5 mV (adjustable)
Noise (typical) 2 mVrms
Source Impedance 50 Ω
Power Supply 4 AA batteries (included)* or
CT3723 power adapter (optional)
Power Consumption 80 mA (about 9 VDC)
*Power indicator will icker when battery voltage drops to 4.5 V or below

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Environmental Characteristics
Operating Temp/Humidity -10°C to 40°C / up to 85% RH
Storage Temp/Humidity -30°C to 70°C / up to 85% RH
Pollution Degree Pollution Degree 2
Altitude Operating: 3,000 m
Nonoperating: 15,300 m
Safety Specications
IEC 61010-031 CAT II
Mechanical Characteristics
Weight 400 g (with probe and rubber boot)
Dimensions 170 x 63 x 21 mm
BNC Cable Length 95 cm
Input Leads Length 45 cm each
Specications are subject to change without notice. To ensure the most current version of this
manual, please download the current version from our website: caltesetlectronics.com.

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6 Voltage Derating Curve
The derating curve of the absolute maximum input voltage in common
mode is shown as follows:
1,000
10,000
100
10 110 100
Frequency (MHz)
Volgage (Vrms)
CT4192 Maximum Input Voltage Derating Curve
1,000
661
154 90
72
Figure 4 Derating Curve

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7 Service & Warranty Information
Limited One-Year Warranty
Cal Test Electronics warrants this product to be free from defective
material or workmanship for a period of 1 year from the date of original
purchase. Under this warranty, Cal Test Electronics is limited to
repairing the defective device when returned to the factory, shipping
charges prepaid, within the warranty period.
Units returned to Cal Test Electronics that have been subject to abuse,
misuse, damage, or accident, or have been connected, installed, or
adjusted contrary to the instructions furnished by Cal Test Electronics,
or that have been repaired by unauthorized persons, will not be
covered by this warranty.
Cal Test Electronics reserves the right to discontinue models, change
specications, price, or design of this device at any time without notice
and without incurring any obligation whatsoever.
The purchaser agrees to assume all liabilities for any damages and/or
bodily injury which may result from the use or misuse of this device by
the purchaser, his employees, or agents.
This warranty is in lieu of all other representations or warranties
expressed or implied and no agent or representative of Cal Test
Electronics is authorized to assume any other obligation in connection
with the sale and purchase of this device.
Service
If you have a need for calibration or repair services, technical, or sales
support, please contact us:
22820 Savi Ranch Parkway
Yorba Linda, CA 92887
800-572-1028 or 714-221-9330
caltestelectronics.com

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Notes

© 2017 Cal Test Electronics450866-001 Rev. B