Pico Technology
Lemo
®
,
Probus
®
and Pico Technology
are registered trademarks.
Issue history:
Manufactured in Republic of China.
Warning statements identify conditions or practices
or practices
to this product or other
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
1 8.8.2008.
James House
Colmworth Business Park
St. Neots
PE19 8YP
www.picotech.com
Terms appearing in this manual:
WARNING
CAUTION Caution statements identify conditions
that could result in injury or death.
that could result in damage
property.
Symbols appearing on the product:
Danger
High Voltage
Protective
(Earth) Terminal
Refer to Manual
Attention
8 © Copyright Pico Technology 2008 DO139-1
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is
output lead is grounded. You
may do this either by connecting the BNC shell to a
, or by
the auxiliary grounding terminal to a
ad the next paragraph for
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
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.
probe, ensure that its
grounded measurement instrument
connecting
reliable ground point. Re
further advice.
8. Derating curve
The derating curve for absolute maximum input voltage is as follows:
10 000
250 0
10 00
10 0
Voltage (V rms)
10
1.0E+05 1.0E+06 1.0E+07 1.0E+08
2500
200
20
Fre quenc y (Hz)
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.
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.
2 © Copyright Pico Technology 2008 DO139-1
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.
DO139-1 © Copyright Pico Technology 2008 7
use only the
accessories designed for use with this differential
the circuit
under test. It is not intended for electrically
insulating the circuit under test and the measuring
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)
Common Mode Range* ±7000V (DC + Peak AC) or 2500 V rms
Absolute Max. Voltage*
Common mode ±7000 V (DC + Peak AC) or 2500 V rms
Differential mode ±7000 V (DC + Peak AC) or 5000 V rms
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**
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.
±700 V (DC + Peak AC) or 700 V rms
±7000 V (DC + Peak AC) or 5000 V rms
(1/100 and 1/1000)
(1/100 & 1/1000)
(1/100 & 1/1000)
or regulated 9 V DC / 120 mA mains adaptor**
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,
d. Using the appropriate probe accessories, connect the input to the circuits under
measurement.
CAUTION This probe is designed for carrying out differential
probe.
measurements between two points on
instrument.
6 © Copyright Pico Technology 2008 DO139-1
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A B C
5. Appearance
The differential probe looks like this:
A. Output Lead The BNC output connector and an auxiliary grounding
B. Input Leads The input leads of the differential probe connect to sprung
C. Sprung Hooks The sprung hooks are connected safely to test points in the
terminal are connected to the oscilloscope.
hooks that come with the probe.
circuits under test.
6. Power leads
Two types of power leads are available for use with this instrument:
a. Lemo
b. Probus
®
Lead: For oscilloscopes with Lemo® power connectors.
®
Lead: For oscilloscopes with Probus® power connectors.
Oscilloscope front panel
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