Clamp for oscilloscope
MH 60
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Oscilloscope clamp
16
Thank you for purchasing this oscilloscope clamp.
For best results from your instrument:
read these operating instructions carefully,
comply with the precautions for use.
Meaning of the symbols:
Attention! Refer to the operating instructions before using the instrument. Those preceded
by this symbol, if omitted or not correctly performed, may cause bodily injury or damage the
In the European Union, this product is subject to selective collection and recycling at end-of life as waste electric and electronic equipment under directive 2002/96/EC (WEEE): this
equipment must not be treated as an ordinary household waste. The spent batteries must
not be treated as household wastes. Take them to the appropriate collection point for
recycling.
This product or this packaging can be recycled.
Instrument entirely protected by double insulation or reinforced insulation
Can be applied to or removed from conductors at dangerous voltages
Earth
instrument and the installations.
Device for DC and AC
PRECAUTIONS FOR USE
Do not expose the clamp to running water or spattering.
Do not use the clamp on uninsulated conductors at a potential exceeding 600V with respect to
earth.
Do not use the clamp on conductors of which the temperature >90°C.
For DC measurements, make sure of the zero of the output. Adjust it if necessary.
During the measurement, make sure that the conductor is correctly aligned with the marks on the
jaws and that the clamp is correctly closed.
If the conductors are not insulated, it may be necessary to wear PPE (Personal Protective
The MH60 oscilloscope clamp includes a NiMH storage battery that must be recharged before any
Except as otherwise stated, our warranty is valid for twelve months starting from the date on
which the equipment was sold (extract from our General Conditions of Sale provided on request).
Equipment)
prolonged storage.
WARRANTY
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Oscilloscope clamp
17
CONTENTS
1. INTRODUCTION ........................................................................................................................... 18
1.1. Presentation .............................................................................................................................. 18
1.2. Safety ......................................................................................................................................... 18
2. Description ................................................................................................................................... 19
3. FUNCTIONS OF THE KEYS AND OF THE LEDS ......................................................................... 19
3.1. Functions of the ON/OFF key ................................................................................................... 20
3.1.1. Switching on........................................................................................................................... 20
3.1.2. Switching off .......................................................................................................................... 20
3.1.3. Deactivate/Activate AUTO OFF ..................................................................................... 20
3.2. Functions of the Filter key .............................................................................................. 20
3.2.1. Change the filter ..................................................................................................................... 20
3.2.2. Adjust the DC-Zero ................................................................................................................ 21
3.3. Indication of the LED ........................................................................................................ 21
3.3.1. Over limit ................................................................................................................................ 21
3.3.2. Failure of the DC zero ............................................................................................................ 21
3.4. Indications of the BAT LED ................................................................................................. 21
3.4.1. Charge state, number of blinks of the LED ...................................................................... 21
3.4.2. Operation with the USB supply ............................................................................................. 22
4. Power supply ............................................................................................................................... 22
4.1. Recharging of the internal storage battery ............................................................................. 22
4.2. Cables ........................................................................................................................................ 22
5. OPERATING ................................................................................................................................. 23
5.1. Precautions ............................................................................................................................... 23
5.2. Use ............................................................................................................................................. 23
5.3. Maintenance .............................................................................................................................. 23
6. TECHNICAL Characteristics ........................................................................................................ 24
6.1. Reference conditions ................................................................................................................ 24
6.2. Characteristics .......................................................................................................................... 24
6.3. Nominal range of use ................................................................................................................ 25
6.3.1. Environmental conditions ..................................................................................................... 25
6.3.2. Electromagnetic compatibility and susceptibility ................................................................ 26
6.3.3. Protection from electric shocks ............................................................................................ 26
6.3.4. Variations in the nominal of the use ..................................................................................... 26
6.4. Extreme conditions ................................................................................................................... 27
6.5. Frequency limits depending on the measurement current .................................................... 27
7. MECHANICAL CHARACTERISTICS ............................................................................................ 28
7.1. Replacing the storage battery .................................................................................................. 29
7.2. Gain adjustment procedure for the MH 60 .............................................................................. 30
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Oscilloscope clamp
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1. INTRODUCTION
1.1. Presentation
The clamp is an oscilloscope current probe using a Hall effect cell, allowing the
measurement of direct or alternating currents up to 100Arms without intervention on
the electrical installation (cutting off of the current to be measured). It is a transducer
delivering a voltage output.
This ammeter clamp, with a round core and air gap, allows rapid measurements of
current in conductors; the measurement output is completely insulated from the
conductor. Its user-friendly shape and small size are especially well suited to this
type of measurement.
Its measurement sensitivity, its metrological performance, and its very good
frequency response qualify it as an oscilloscope accessory.
The connection is made by a BNC coaxial cable.
The clamp is powered by an internal storage battery and by a standard type B 5V
µUSB connector.
1.2. Safety
Never make measurements on uninsulated conductors at potentials
exceeding 600V with respect to earth.
This clamp is protected by double insulation or reinforced insulation. It does not need to
be connected to a protective earth to ensure electrical safety. The USB power
connector is isolated from the measurement output, preventing any hazardous potential
from the BNC connector.
It is designed for indoor use, altitude ≤2000m, in an environment of degree of
pollution 2.
It can be used for measurements on CAT II installations up to 600V and CAT III installations
up to 300V and complies with international standards IEC 61010-1 and IEC 61010-2-032.
Do not use it on conductors carrying currents at high frequency, greater than
4 Arms@1MHz risk of burns and of deformation of the jaws of the clamp.
The protection provided by this clamp may be impaired if it is used other than as
specified.
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Oscilloscope clamp
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1. Jaws
2. Passage of the conductor
3. Non-slip guard
4. Keypad (see below)
5. Opening trigger
6. Integrated leads: 2m BNC and 0.3m USB
3kHz filter (green)
30kHz filter (green)
Overload (red)
Filter key
DC-Zero (2s)
Auto Off symbol
LED POWER
LED BAT
ON / OFF
3. FUNCTIONS OF THE KEYS AND OF THE LEDS
2. DESCRIPTION
This keypad is item 4 in the figure above:
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Oscilloscope clamp
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3.1. Functions of the key
3.1.1. Switching on
Long-press the key. The clamp MH60 acknowledges with the LED. Then
release . The "ON" state of the MH60 clamp is indicated by the sequential lighting
of the "BAT" LED.
3.1.2. Switching off
Long-press the key (2s). The MH60 clamp acknowledges the long press by the rapid
blinking of the LED, then all of the LEDs. When the key is released, the MH60
clamp switches off.
3.1.3. Deactivate/Activate AUTO OFF
Reminder: Each time the device is switched on (by pressing ), AUTO OFF is
active.
If operation is interrupted because the storage battery charge is too low, the current
state of the AUTO OFF function is stored, then restored when the power supply is
restored.
Start from the following state: the MH60 clamp is "ON".
Hold the key down and press xx.
Keep it pressed (approx. 2s) until acknowledged, then rapid blinking of the LED.
Release the XXX and keys.
The LED stops blinking The AUTO OFF function is deactivated.
To reactivate , proceed in the same way or switch On/Off using .
Remarks: The "AUTO OFF" timer is reset whenever one of the keys is pressed.
The Auto Power Off hold-off time is approximately 10mn.
3.2. Functions of the Filter key
3.2.1. CHANGE THE FILTER
A short press on the key changes the filter. Depending on the filter chosen, it is the
3kHz LED or the 30kHz LED that lights (green LED). If both LEDs are off, it means
that it there is no filter.
The state of the filter is stored. It is restored at each power up.
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Oscilloscope clamp
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3.2.2. Adjust the DC-Zero
The clamp must not be on a conductor, the jaws must be closed.
Long-press the key (approx. 2s). The DC-Zero function is then activated.
During the process, the LED is lit. At the end of the process, if there is no ERR, the
LED goes off. Otherwise, it remains lit.
The ERR status is generally caused by the flow of a current in a
conductor in a clamp.
The MH60 clamp includes a magnetometer that reduces the influence of external
fields, notably the Earth's field.
Example: I adjust the zero with the plane of the horizontal: to "clamp", I turn my
clamp to the vertical. Thanks to the magnetometer, my zero is preserved.
3.3. Indication of the LED
3.3.1. Over limit
The LED is lit when the measurement current exceeds 110Arms ±3%.
This function does not take the frequency derating into account.
3.3.2. Failure of the DC zero
The LED remains lit following failure of the DC zero adjustment.
3.4. Indications of the BAT LED
3.4.1. Charge state, number of blinks of the LED
When the clamp is in operation, the LED of the power supply flashes sequentially
according to the charge level of the storage battery:
If the remaining life is 2h, the LED blinks once every 3s.
For 2 additional hours, it flashes one more time.
E.g.: If the LED flashes 5 times every 3s, the remaining life of the storage battery
is 7 to 8h.
At the end of discharging, when the last 2 hours have been consumed,
the LED scintillates permanently, until a complete shutdown occurs automatically.
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Oscilloscope clamp
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3.4.2. Operation with the USB supply
The clamp is "OFF". Connect the USB.
The storage battery charges blinking every second; at the end of
charging, this LED remains lit.
The clamp is "ON". Connect the USB, the storage battery is in permanent
trickle charging the LED is lit permanently.
4. POWER SUPPLY
The clamp is powered either from the internal storage battery or from an external 5 VDC
supply connected to the Type B µUSB connector.
Power supply: from the internal storage battery
Life between charges: from 7 to 8 hours of non-stop operation
Type: 1 1.2V NiMH AAA cell with soldered lug, connected by
connector
Life: 2 years minimum
Nr. of recharging cycles: 300
This type of storage battery can be procured from CHAUVIN ARNOUX.
Power supply: from the Type B µUSB connector.
Max. consumption (with storage battery charging): <170mA
4.1. Recharging of the internal storage battery
The internal storage battery can be recharged in the presence of an external
power source, with the clamp off.
A complete charging cycle lasts approximately 10 hours.
If the clamp is in operation, only a trickle charge is applied, so the storage battery
keeps its charge, but it is not recharged in this case.
4.2. Cables
Output: BNC coaxial cable 2m long
Power supply: the power supply cable, 30cm long, has a female Type B µUSB
connector.
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Oscilloscope clamp
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5. OPERATING
5.1. Precautions
Do not exceed the voltage of 300V (CAT III) or 600V (CAT II) with respect to
earth with an uninsulated conductor.
Use the clamp on conductors in which the current is less than or equal to the
maximum continuous value allowed, namely 100Arms or 140A peak.
Do not expose the clamp to running water or spattering.
Keep your hand and fingers behind the guard.
If the housing of the product is cracked or broken, and/or the front panel with the
buttons separates, there is a risk of electrocution; make sure that the product is
not used in that condition, and replace it or have it repaired.
5.2. Use
Adjust the DC-Zero.
Press the trigger to open the jaws of the clamp, then place the clamp on the
conductor with the current in the right direction (source P1 towards the back of
the arrow, receiver P2 towards the tip of the arrow).
Close the clamp. Make sure that it is correctly closed and centred on the
conductor, in order to obtain optimum measurement accuracy.
The pass band can be modified on demand: 1MHz, 30kHz, 3kHz.
5.3. Maintenance
Before any maintenance work is done, the clamp must not enclose a conductor; it must
also be disconnected from the external instrument to which it is connected.
Maintenance of the magnetic circuit
Keep the air gaps of the clamp perfectly clean.
Wipe them, if necessary, with a soft cloth.
Maintenance of the housing
Clean the clamp with a cloth moistened with soapy water and rinse with a cloth
moistened with clear water. Never run water on the clamp.
Dry using a dry cloth or forced air (max. temperature +70°C).
Check of the calibration
Annual verification of the measurement characteristics by an approved
organization.
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Quantity of influence
Reference conditions
Starting up before measurement
1mn
Ambient temperature
23°C ±5K
Humidity
20% to 75% RH
Frequency
from DC to 400Hz
Position of the conductor
centred in the jaws
External AC magnetic field
no field
External DC magnetic field
<40A/m (Earth's field)
Impedance of the measuring instrument
1M and C <100 pF
Parameter
Value
Nominal range
100 ADC (or 100 AAC)
Output/input ratio
10mV/A
Resolution
10mA
Error in % of measurement
0.5 to 64 Arms
±1.5% ±0.1mV1
64 to 90 Arms
±4%
90 to 100 Arms
±5%
Phase error at 50Hz
and without filtering
±1°
Pass band according to filter
chosen
1MHz @ -3dB
30kHz @ -3dB
3kHz @ -3dB
Noise at output, mArms
15 5 4
Rise time
from 10 to 90%
350ns
11.7µs
117µs
di/dt
5A/s at 2A peak/peak
150A/ms
15A/ms
Output voltage for Ip= 0
after compensation of the zero
±0.5mVDC or ±50mADC
Range of zero or counter-
current compensation
±3 ADC approximately
Insertion impedance
0.25m (at 400Hz) or in RF: 0.1µH for a primary transition
6. TECHNICAL CHARACTERISTICS
6.1. Reference conditions
6.2. Characteristics
Oscilloscope clamp
(1) concerning the residual offset
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Oscilloscope clamp
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Life versus storage temperature, storage battery
fully charged.
40°C to 50°C 3 months
30°C to 40°C 6 months
-20°C to 30°C 24 months
6.3. Nominal range of use
6.3.1. Environmental conditions
1 = Reference range
2 = Operating range
3 = Storage range
The storage range is reduced by the presence of a storage battery. At high
temperatures, the self-discharge current is higher. It is a deep discharge that
causes deterioration of the storage battery. It is therefore necessary to
completely pre-charge the storage battery prior to prolonged exposure to high
temperatures. Recharge if the exposure to 50°C lasts more than 3 months
(6 months at 40°C, 24 months at 30°C).
Below, foreseeable storage durations, storage battery fully charged:
- Tightness with clamp closed: IP40 with clamp jaws closed, per EN 60529
- Transport altitude: 12000m
- Use: indoor
- Temp. on BNC output cable: 90°C max.
- Temp. on housing and jaws: 90°C max.
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Oscilloscope clamp
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Quantity of influence
Influence
Typical
Maximum
USB supply voltage
5 VDC ±5%
or storage battery voltage
between 20% and
100% charge
0
none
Relative humidity
10% at 90% RH
0.1% of Is
Temperature on
measurement
-10°C to +45°C
±0.12%/°C
45°C to +50°C
±0.22%/°C
Settling time
upon start of operation
10 s
Pass band (without
filter)
DC to 1kHz
1%
to 100kHz
-0.2dB
-0.5dB
to 500kHz
-0.5dB
-1dB
to 1MHz
-1.5dB
-3dB
Position of the cable
DC to 100Hz
±1.5%
Repeatability of the
measurement
10 open./clos.
mean : 0.3%
Common mode
rejection
50Hz
>90dB or 0.003%
400Hz
>80dB or 0.01%
Rejection of an external
current at 50Hz (1)
near air gap
30dB jaws
34dB
grip
40dB
External magnetic field
(spatial position) (2)
DC (Earth's)
±0.3mV or
±30mA
±1mV or
±100mA
High-frequency
electromagnetic field,
10V/m
between 650MHz and
750MHz
value of the current
1.2A
1.5A max
6.3.2. Electromagnetic compatibility and susceptibility
Compliant with IEC 61326-1 for emissions and immunity in industrial use.
6.3.3. Protection from electric shocks
Type A clamp with double insulation or reinforced insulation in the grip part in
normal use, and double insulation or reinforced insulation between the primary
and the secondary output and the terminations part of the USB power supply and
the BNC output.
Maximum service voltage per EN61010-2-032
- 300V in installations of category III and degree of pollution 2.
- 600V in installations of category II and degree of pollution 2.
6.3.4. Variations in the nominal of the use
(1) Conductor outside the jaws and parallel to the position of a conductor in the jaws.
(2) Measurement made after demagnetization of the clamp. For this purpose, set to AC, I = 0, gradually
increase the value to I = 40A. Gradually reduce the value to I = 0.
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Oscilloscope clamp
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45/1F
6.4. Extreme conditions
- Overload: 1500 ADC for 1mn.
6.5. Frequency limits depending on the measurement current
In normal use, 100Arms permanent up to the frequency of 45kHz.
Derating at frequency above 100A, 45kHz:
Per the formula: 100A x
(F in kHz)
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7. MECHANICAL CHARACTERISTICS
Type
Part concerned
Characteristics
Note
Clamp
dimensions
138 x 49 x 28mm
overall
mass
200g approx.
with cable and storage
battery
self-extinguishing
housing
V2 (UL94)
jaws
V0 (UL94)
cables
V0 (UL94)
BNC and USB
Jaws
and trigger
maximum opening
27mm
colour red
clamping of cable
1 cable 26mm in
diameter
max. temperature:
<90°C
Cables
type
1 ready-made BNC
coaxial
BNC cable
length
diameter
2m
4mm approx.
tensile strength
100N
Flexions
30000
at the housing
connection of the
connector
5000
connections/disconnections
USB cable
type
female µUSB cable
length
diameter
30cm
4mm approx.
Power supply
connector
type
female µUSB
5 VDC
Measurement
connector
type
Insulated male BNC
Height of fall
clamp
1m
NF EN 60068-2-32
Protection against
impacts
Housing and jaws
IK04 0,5J
EN 50102
Oscilloscope clamp
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Oscilloscope clamp
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7.1. Replacing the storage battery
Procure the replacement storage battery (ref. P0 1296049).
Disconnect the USB charger and remove the clamp from any circuit.
Withdraw the two screws closing the housing.
Identify the two-point storage battery connector and disconnect it.
Lift the storage battery clear and unclip it.
Refitting: proceed in the reverse order.
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Step
Action
1
Switch the clamp on and clamp it centred on the coil. Connect the clamp to the
multimeter using the adapter.
2
Optional: Demagnetize the clamp (0…3A....0/50 or 60Hz) 2.
3
Adjust the DC-Zero with no current and do not subsequently move the clamp.
The measurement must be < 0.1mV DC.
4
Establish a current of 3A1 60Hz in the coil.
5
Measure the output voltage with the multimeter set to AC rms and note this value.
Step
Action
1
Switch the clamp on and clamp it centred on the coil
2
Optional: Demagnetize the clamp (0…3A....0/50 or 60Hz) 2.
3
Adjust the DC-Zero with no current and do not subsequently move the clamp.
4
Press the DC-Zero key and the ON/OFF key for approx. 30s, until all of the indicators
blink. At this point, there is no turning back: the procedure must be completed.
5
Release the keys. The BAT and ON/OFF LEDs blink.
6
Establish a current of1 3A 60Hz in the coil.
7
Adjust the output by successive presses3 on the DC-Zero key until you reach 300mV
1.5mV. Wait for the display to stabilize between presses.
8
Press the ON/OFF key 2s (the ON/OFF LED blinks) to store the gain.
9
Gradually reduce the current from 3A to zero.
10
Check the gain as before.
Oscilloscope clamp
7.2. Gain adjustment procedure for the MH 60
Make sure you are technically qualified to perform this operation.
Warning: Make this adjustment only if the gain coefficient is manifestly outside
tolerances. Check first that nothing interferes with the movements of the jaws
and that the air gap is clean. Make sure that the clamp is adequately charged.
Disconnect the USB charger.
Check of the gain:
Equipment necessary: AC current calibrator accurate to 0.1% capable of delivering least 3A
at 50/60Hz, 10-turn coil, RMS AC multimeter accurate to better than 0.1%, female
BNC/male banana adapter, leads.
- If 295.1mV ≤ Reading ≤304.9mV Do not adjust.
- Otherwise: adjust the gain.
Adjusting the gain:
(1) Gradually increase the current starting from zero.
(2) Gradually increase the current, starting from zero, up to 3A, then gradually reduce it to zero.
3
(
) The increment is approximately 0.5mV.
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