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SI-9001
25MHz HIGH VOLTAGE DIFFERENTIAL PROBE
USER’S MANUAL
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This probe is in compliance with IEC61010-031 CAT III, Pollution Degree 2.
1. Safety Terms and Symbols
Terms appear in this manual:
________________________________________________
WARNING. Warning statements identify conditions or practice that
________________________________________________
CAUTION. Caution statements identify conditions or practice that
Symbols appear on the product:
could result in injury or loss life.
could result in damage to this product or other property.
Danger Protective Attention
High Voltage (Earth) Terminal Refer to Manual
2. General Safety Summary
Review the following safety precautions to avoid injury and prevent damage to this probe
or any products that connected to it.
Observe Maximum Working Voltage
To avoid any injury, do not use the probe under the condition that the voltage between
either input lead or earth is above 1000Vrms CAT III. This voltage rating applies to both
of 1/10 & 1/100 settings.
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Must be Grounded
This probe is grounded with the shell of BNC connector and an auxiliary grounding terminal,
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 the auxiliary grounding
terminal is connected to a proper ground, while the measurement instrument is properly
grounded.
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 covers removed.
Do Not Operate in Wet/Damp Conditions
To avoid electric shock, do not operate this probe in wet of 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 Circuit
To avoid injury, remove jewelry such as rings, watches, and other metallic objects. Do not touch
exposed connections and components when power is present.
Use Proper Power Source
To ensure this probe function well, use four AA cells or 6VDC/60mA or regulated 9VDC/40mA
mains adaptor or power lead. Do not operate this probe from a power source that applies more
than the voltage specified.
Do Not Operated With Suspected Failures
If you suspect there is damage to this probe, have it inspected by qualified service personnel.
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3. Description
By enabling conventional oscilloscopes to display and measure in-circuit waveforms that are
referenced to high common mode voltages. The differential probe extends the measurement
capability of oscilloscopes in electronic power converters, inverters, motor speed controls,
switch mode power supplies, and many applications.
4. Installation
a. Simply plug-in the BNC output connector to the vertical input of a general purposed
oscilloscope or other measurement instrument, and connects the auxiliary grounding terminal
to a proper ground. The measurement instrument must have a ground referenced.
b. Connect an appropriate power source to this probe and then turn it on.
c. Select the proper attenuation ratio. When measuring signals below 70V, switch the attenuation
ratio to 1/10 in order to get higher resolution and less noise ratio. Otherwise, set the
attenuation ratio to 1/100 when measuring signals up to 700V.
WARNING. To protect against electric shock, use only the
accessories supplied with this probe.
d. Using the appropriate probe accessories, connect the inputs to the circuits under
measurement.
CAUTION. This probe is to carry out differential measurement
between two points on the circuit under measurement.
This probe is not for electrically insulating the circuit
under measurement and the measuring instrument.
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5. Appearance
The differential probe looks as follows.
a. Output Cable 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 circuits
under measurement.
6. Power Leads
We offer the following power leads;
a. Lemo® lead: For the oscilloscope whose power connector is Lemo® connector.
b. USB power cord: For the oscilloscope which offers USB connector.
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7. Specifications
Bandwidth DC to 25MHz (-3dB)
Attenuation Ratio 1:10/100
Accuracy ±2%
Rise Time
Input Impedance
14ns
4MΩ//5.5pF each side to ground
Input Voltage
-Category CAT III
-Differential Range ±70V(DC+AC Peak) and 70Vrms @1/10
±700V(DC+AC Peak) and 700Vrms @1/100
- Common Mode Range
- Absolute Max. Voltage
(Differential or Common Mode)
±700V(DC+AC Peak) and 700Vrms @1/10 & 1/100
±1400V(DC+AC Peak) and 1000Vrms @1/10 & 1/100
Output Voltage
- Swing ±7V (into 50kΩ load)
- Offset (typical) <±5mV
- Noise (typical) 0.7mVrms
- Source Impedance (typical) 50Ω (for using 1MΩ input system oscilloscope)
CMRR (typical) -86dB @50Hz, -66dB @20kHZ
Ambient Operating Temperature
Ambient Storage Temperature
-10 to 40℃
-30 to 70℃
Ambient Operating Humidity
Up to 85% RH
Ambient Storage Humidity Up to 85% RH
Power Requirements*
- Standard 4xAA cells
- Options Power leads, Mains adaptor* (6VDC/60mA
Length of BNC Cable
or regulated 9VDC/40mA), USB power cord
95cm
Length of Input Leads 45cm
Weight 400gms (probe and PVC jacket)
Dimensions (LxWxH) 170mm x 63mm x 21mm
*
a. The supplied voltage must be less than 12V and greater than 4.4V, otherwise the probe could
be damaged or can’t be operated properly.
b. polarity is “+” inside and “–” outside. For wrong polarity, built-in circuit protects the probe,
no danger or damage will occur.
c. When the voltage of the cells become too low, the power indicator on the panel will flicker.
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8. Derating Curve
The derating curve of the absolute maximum input voltage in common mode is shown as
follows;
10000
1000
Voltage (Volt rms)
1000
100
1.0E+06 1.0E+07 1.0E+08
1000
700
150
Frequency (Hz)
9. Inspection Procedure
a. Connect the BNC output connector to the vertical input of a general purposed
oscilloscope.
b. To install four AA cells or connect an appropriate mains adaptor or power lead to the
correct line voltage.
c. Set the oscilloscope input coupling to DC and the 1V/div. Center the trace on the
display.
d. Connect the inputs of the probe to power lines.
e. Set the range of the probe to 1/100.
f. Then, a 50Hz/60Hz sine-wave of proper amplitude will be displayed on the screen of
the oscilloscope and this means the probe is working properly.
10. Cleaning
Use a soft cloth to clean the dirt. Prevent damage to probe.
a. Avoid immersing the probe.
b. Avoid using abrasive cleaners.
c. Avoid using chemicals contains benzene or similar solvents.
Lemo® is the registered trademarks
Date: May 16, 2019
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