TA044 - PICO TECHNOLOGY - Datasheet.Live

8 © Copyright Pico Technology 2008 DO139-1

Pico Technology

James House

Colmworth Business Park

St. Neots

PE19 8YP

www.picotech.com

Lemo

Probus

and Pico Technology

are registered trademarks.

Issue history:

1 8.8.2008.

Manufactured in Republic of China.

DO139-1 © Copyright Pico Technology 2008 1

TA044

70 MHz High-Voltage Differential Probe

User’s Manual

This probe complies with IEC-1010.2-031 CAT I, Pollution Degree 2.

1. Safety terms and symbols

Terms appearing in this manual:

WARNING

Warning statements identify conditions or practices

that could result in injury or death.

CAUTION Caution statements identify conditions

or practices

that could result in damage

to this product or other

property.

Symbols appearing on the product:

Danger

High Voltage

Protective

(Earth) Terminal

Attention

Refer to Manual

2 © Copyright Pico Technology 2008 DO139-1

2. General safety summary

Please review the following safety precautions to avoid injury and prevent damage

to this probe or any products that are connected to it.

Observe maximum working voltage

To avoid any injury, do not use the probe above 2500 V rms CAT I between each

input lead and earth or above 5000 V rms CAT I between the two input leads.

Must be grounded

This probe is grounded with the shell of the BNC connector and an auxiliary

grounding terminal.

WARNING Before making connections to the input leads of th

probe, ensure that its

output lead is grounded. You

may do this either by connecting the BNC shell to a

grounded measurement instrument

, or by

connecting

the auxiliary grounding terminal to a

reliable ground point. Re

ad the next paragraph for

further advice.

You must verify that the probe is securely grounded before connecting the probe

input leads. Some types of measuring instrument, such as a USB oscilloscope

connected to a laptop, are unlikely to be grounded even if the laptop is powered

from the mains. Bench-top oscilloscopes are usually grounded, but in some cases

may have been isolated from ground. A USB oscilloscope connected to a desktop

computer is usually grounded. In any case, do not assume that the measurement

instrument is grounded. Always verify the ground connection for yourself

before connecting the probe input leads.

Use fused test prods if necessary

If this probe is intended to use for measurements in circuits of INSTALLATION

CATEGORY III, it should incorporate with fused test prods.

Do not operate without covers

To avoid electric shock or fire hazard, do not operate this probe with the covers

removed.

Do not operate in wet or damp conditions

To avoid electric shock, do not operate this probe in wet or damp conditions.

Do not operate in explosive atmosphere

To avoid injury or fire hazard, do not operate this probe in an explosive atmosphere.

Avoid exposed circuitry

To avoid injury, remove jewelry such as rings, watches and other metallic objects.

Do not touch exposed connections and components when power is present.

DO139-1 © Copyright Pico Technology 2008 7

8. Derating curve

The derating curve for absolute maximum input voltage is as follows:

9. Overrange indicator

The overrange indicator lights up red if the voltage of the input signal exceeds the

linear operating range of the probe. When this happens, the signal on the probe

output may not accurately represent the signal on the probe input.

10. Test procedure

a. Connect the BNC output connector to the vertical input of a general-purpose

oscilloscope.

b. Install four AA cells or connect an appropriate mains adaptor to this probe.

c. Set the oscilloscope input coupling to DC and 1 V/div. Center the trace on the

display.

d. Connect the sprung hooks of the probe to power lines.

e. Set the range of the probe to 1/100.

f. A 50 Hz / 60 Hz sine-wave of proper amplitude will be displayed on the screen

of the oscilloscope. This means the probe is working properly.

11. Cleaning

Use a soft cloth to clean the probe, taking care not to cause damage.

a. Do not immerse the probe.

b. Do not use abrasive cleaners.

c. Do not use chemicals contains benzene or similar solvents.

200

2500

100

1000

10000

1.0E+05 1.0E+06 1.0E+07 1.0E+08

Frequenc y (Hz)

Voltage (V rms)

6 © Copyright Pico Technology 2008 DO139-1

7. Specifications

Bandwidth DC to 70 MHz (-3 dB)

Attenuation ratio 1:100/1000

Accuracy ±2%

Input Impedance 10 MΩ// 10 pF each side to ground

Input Voltage

Differential Range* (1/100)

Max. Differential* (1/1000)

±700 V (DC + Peak AC) or 700 V rms

±7000 V (DC + Peak AC) or 5000 V rms

Common Mode Range* ±7000V (DC + Peak AC) or 2500 V rms

(1/100 and 1/1000)

Absolute Max. Voltage*

Common mode ±7000 V (DC + Peak AC) or 2500 V rms

(1/100 & 1/1000)

Differential mode ±7000 V (DC + Peak AC) or 5000 V rms

(1/100 & 1/1000)

Output Voltage

Swing ±7V into 50 kΩ load

Offset (typical) <±5 mV

Noise (typical) 0.9 mV rms

Source Impedance (typical) 50 Ω

CMRR (typical) -80 dB @ 60 Hz; -50 dB @ 1 MHz

Ambient Operating Temperature -10 to 40 ℃

Ambient Storage Temperature -30 to 70 ℃

Ambient Operating Humidity 25 to 85% RH

Ambient Storage Humidity 25 to 85% RH

Power Requirements

Standard 4xAA cells or 6 V DC / 200 mA mains adaptor**

or regulated 9 V DC / 120 mA mains adaptor**

Options Power leads

Length of Input Leads 60 cm

Length of BNC Lead 90 cm

Weight 500 g

Dimension (LxWxH) 202 mm x 83 mm x 38 mm

* Voltage limit is the lesser of the DC+Peak AC and RMS values.

a. The supplied voltage must be less than 12 V and greater than 4.4 V, otherwise

the probe could be damaged or might not operate properly.

b. Polarity is “+” inside and “–” outside. If the polarity is wrong, a built-in circuit

protects the probe so that no danger or damage will occur.

c. When the voltage of the cells becomes too low, the power indicator on the

panel will flicker.

Use proper power source

To ensure proper functioning of this probe, use four AA cells or a 6 VDC / 200 mA

mains adaptor or 9 VDC / 120 mA mains adaptor or power leads.

Do not operate the probe if it is damaged

If you suspect there is damage to this probe, have it inspected by qualified service

personnel.

3. Description

By enabling conventional oscilloscopes to display and measure in-circuit waveforms

that are referenced to high common-mode voltages, this differential probe extends

the measurement capability of oscilloscopes to electronic power converters,

inverters, motor speed controls, switch-mode power supplies and many other

applications.

4. Installation

a. Simply plug in the BNC output connector to the vertical input of a

general-purpose oscilloscope or other measurement instrument, and connect

the auxiliary grounding terminal to a proper ground. The measurement

instrument must have a ground reference.

b. Install four AA cells or connect an appropriate power source to this probe.

c. Select the proper attenuation ratio. When measuring signals below 700 V,

switch the attenuation ratio to 1/100 in order to get higher resolution and less

noise. Otherwise, set the attenuation to 1/1000.

WARNING To protect against electric shock,

use only the

accessories designed for use with this differential

probe.

d. Using the appropriate probe accessories, connect the input to the circuits under

measurement.

CAUTION This probe is designed for carrying out differential

measurements between two points on

the circuit

under test. It is not intended for electrically

insulating the circuit under test and the measuring

instrument.

5. Appearance

The differential probe looks like this:

A. Output Lead The BNC output connector and an auxiliary grounding

terminal are connected to the oscilloscope.

B. Input Leads The input leads of the differential probe connect to sprung

hooks that come with the probe.

C. Sprung Hooks The sprung hooks are connected safely to test points in the

circuits under test.

6. Power leads

Two types of power leads are available for use with this instrument:

a. Lemo

Lead: For oscilloscopes with Lemo

power connectors.

b. Probus

Lead: For oscilloscopes with Probus

power connectors.

Oscilloscope front panel