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:

z In the presence of noxious, corrosive, flammable fumes, gases,

vapors, chemicals, or finely-divided particulates.

z In environments where there is a danger of any liquid being

spilled on the probe.

z In air temperatures exceeding the specified operating

temperatures.

z In 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

z Meets IEC 61010-031 safety standard
z 70 MHz bandwidth (-3dB)
z Up to ±700 V (DC + AC peak) common mode
z Selectable attenuation settings of 10x/100x

z Power indicator
z High accuracy (±1%)
z Powered by 4 AA batteries (included)

z Power 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:

z Differential probe
z (2) Hook probes, black & red
z (4) AA batteries
z Offset adjustment tool
z User 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

1

10 100

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