Unit UT-P43 Series User manual

UT-P43&UT-P44 Series Current Probe
Instruction Manual

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UT-P43&UT-P44 Series
Current Probe
Instruction Manual
Please read the instruction manual carefully to avoid injury
and prevent damage to this product.
Ver. 1.03 2021-5-17

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Preface
At first, thank you very much for using our product UT-P43&UT-P44
series high voltage isolating probes. This instruction manual includes
safety summary, brief introduction, main specifications and operating
basics etc. Please read the manual carefully prior to use the product.
Warranty
UNI-T warrants that this product will be free from defects in materials
and workmanship for a period of one (1) year from the date of shipment.
If any such product proves defective during this warranty period, UNI-T,
at its option, either will repair the defective product without charge for
parts and labor, or will provide a replacement in exchange for the
defective product. Parts, modules and replacement products used by
UNI-T for warranty work may be new or reconditioned to like new
performance. All replaced parts, modules and products become the
property of UNI-T.
This warranty shall not apply to any defect, failure or damage caused by
improper use or improper or inadequate maintenance and care.
THIS WARRANTY IS GIVEN BY UNI-T WITH RESPECT TO THE
PRODUCT IN LIEU OF ANY OTHER WARRANTIES, EXPRESS OR
IMPLIED. UNI-T AND ITS VENDORS DISCLAIM ANY IMPLIED
WARRANTIES OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE. UNI-T AND ITS VENDORS WILL NOT
BE LIABLE FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR
CONSEQUENTIAL DAMAGES IRRESPECTIVE OF WHETHER
UNI-T OR THE VENDOR HAS ADVANCE NOTICE OF THE
POSSIBILITY OF SUCH DAMAGES.

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Table of contents
1. Safety Summary …………………………………………4
2. Brief Introduction…………………………………………5
3. Main Specification ………………………………………6
4. Unpacking and Preparation for Use ………………………8
5. General View of Product …………………………………9
6. General View of Accessories………………………………10
7. Operating Basics …………………………………………11

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1. Safety Summary
Please Review the following safety precautions to avoid injury and
prevent damage to this product or any products connected to it.
Use proper AC adapter. Use only the AC adapter specified for this
product.
Connect and disconnect properly. Connect the probe output to the
measurement instrument before connecting the probe to the circuit under
test. Disconnect the probe input from the circuit under test before
disconnecting the probe from the measurement instrument.
Do not connect or disconnect probes while they are connected to a
voltage source.
Ground the product. This product is indirectly grounded through the
grounding conductor of the mainframe power cord. To avoid electric
shock, the grounding conductor must be connected to earth ground.
Before making connections to the input or output terminals of the
product, ensure that the product is properly grounded.
Do not operate without covers. Do not operate this product with covers
or panels removed.
Power disconnect. The power cord disconnects the product from the
power source. Do not block the power cord; it must remain accessible to
the user at all times.
Do not operate in an explosive atmosphere.
Do not operate in wet/damp conditions.

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2. Brief introduction
UT-P43&UT-P44 series current probe applies Advanced
magneto-electric sensors. It is used to measure the circuit current with an
oscilloscope Using electromagnetic induction and magneto-electric
induction.
UT-P43&UT-P44 series current probe can measure 20A（DC + peak AC）
or 40A（DC + peak AC）current. The frequency bandwidth of measured
signal is 25MHz or 50MHz.
UT-P43&UT-P44 series current probe can be used to do power analysis
of high frequency signal with our UT-P35&UT-P36 Series high voltage
isolating probe. The delay time of any two probes is less than 1ns.
UT-P43&UT-P44 series current probe is small and robust. It has very
high stability, reliability and accuracy.
It may be used at the following location usually:
Measure current without connect to circuit
Power analysis
Switch-mode power supplies design
Power convert design
AC inverter and UPS
Transducer design
Electronic ballast design
Electromotor drive design
CRT display design
Electric and electronic experiment

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3. Main Specifications
Electrical Specification
Model
UT-P43
UT-P44
Bandwidth (-3dB) 25MHz 50MHz
Rise time 14ns
7ns
Max. measurable current 20A（DC + peak AC）40A（DC + peak AC）
Current transfer ratio 100mV/A 50mV/A
Accuracy ± 3%
Max. measurable pulse
current
50A（Tp ≤10μs）
Max. voltage on
uninsulated wire
400V（DC + peak AC）
Noise ≤1mVrms
Linearity ±1%
Delay time 20ns±1ns
AC adapter output DC9V，1000mA
AC adapter input AC100~240V，50~60Hz
Typical mechanical specification
Jaw opening 4.5mm
Output cable length About 130cm

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Probe body
188×40×24
（
mm
）
Weight (probe only) 150g
Environment Specification
Operating temperature 0~40℃
Storing temperature
-10~45
℃
Operating humidity 85%RH
Storing humidity
90%RH
Operating altitude 3000m
Storing altitude 12000m

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4. Unpacking and Preparation for Use
4-1 Unpacking
This product has been checked and tested for the quality before it comes
out of the factory. Please check if there is damage during the
transportation when unpacking. If there is, please inform the
transportation company and the local agent immediately.
Packing list:
Current probe 1pcs
Instruction manual 1pcs
AC adapter 1pcs
4-2 Preparation for use
Please check the line voltage prior to connect the AC adapter to the
electric outlet. The line voltage should be coincident the following list. If
the incorrect line voltage is used, it will damage the product and the AC
adapter.
AC adapter input voltage
Frequency
AC100V~240V
50~60Hz
Warning：Use only the AC adapter specified for this product to
avoid injury and prevent damage to this product.

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5. General View of Product

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6. General View of Accessories
The product include an accessories: An AC adapter

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7. Operating Basics
UT-P43&UT-P44 series current probe is very convenient to operate.
But we suggest every new user should read the manual perfectly prior to
begin operating.
7-1 Operation steps
a. Check and affirm the AC adapter input voltage is correct prior to
use.
b. To get accurate measuring result, degauss and balance the probe
according to following step:
After turning on the oscilloscope and allowing a 20-minutes
warm-up period.
Connect the current probe to an input terminal or the
oscilloscope. Set the input channel to the highest sensitivity
and set a zero reference point.
With the probe jaw empty, push the slide on the probe until it
locks completely.
Press the DEGAUSS button.
Adjust the BALANCE thumbwheel until the displayed signal
is zero.
c. Slide the lid of probe jaw and open the probe jaw, then put the
measured wire into the probe jaw and close the probe jaw
completely as shown in Figure 7-1. The positive current is aligned
with the arrow on the probe jaw.
d. After complete the previous steps, power on the wire circuit.
e. Adjust the oscilloscope to display the signal.
f. When the measure is over, power off the wire circuit, then open the

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probe jaw to get out the wire.
Figure7-1 Figure7-2
7-2 Attention to use：
a. To measure differential or null current, you can place two wire in the
probe jaw.
b. If you are measuring DC or low-frequency AC signal of very small
amplitudes, you can increase measurement sensitivity of your current
probe by winding several turns of the wire under test around the probe
as shown in Figure 7-2.
7-3 Troubleshooting
The Power LED does
not remain lit
Check that the AC adapter is plugged in and
functional.
The measured
waveform can’t be
displayed right and
stability
Check that the probe
jaw and keep it closed
completely.
Check the probe connection to the oscilloscope.
Change a different channel on the oscilloscope
or change a different oscilloscope.

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