Megaimpulse CS-10/500 User manual

CURRENT MEASUREMENT SHUNT
CS-10/500
USER MANUAL
© 2017 Megaimpulse Ltd.

Copyright © 2017 MEGAIMPULSE Ltd. All Rights Reserved.
MEGAIMPULSE LTD. PROVIDES THIS MANUAL "AS IS" WITHOUT WARRANTY OF ANY KIND,
EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OR
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APPEAR IN THIS MANUAL, INCLUDING THE PRODUCTS AND SOFTWARE DESCRIBED IN IT.
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Megaimpulse Ltd. contact information
Address: 26 Polytechnicheskaya str., St. Petersburg, 194021 Russia
www: http://www.megaimpulse.com
e-mail: [email protected]u
fax: [phone]

CONTENTS
Package content ................................................................................................ 2
General view of CS-10/500 current measurement shunt ................................... 2
Safety manual ................................................................................................... 3
Technical specification ..................................................................................... 4
The drawing of CS-10/500 current measurement shunt ................................... 5
Putting the shunt into operation ........................................................................ 6
Warranty ........................................................................................................... 10
CS-10/500 shunt user manual 1

PACKAGE CONTENT
Please check the package for the following items:
CS-10/500 current measurement shunt (hereinafter "shunt")
20dB 18 GHz attenuator with SMA connectors
coaxial cable assembly with SMA connectors
SMA-to-BNC adapter
Fig. 1. General view of CS-10/500 current measurement shunt.
MEGAIMPULSE LTD. 2

SAFETY MANUAL
Electrical safety
CS-10/500 shunt is designed for short pulse current measurement in high
voltage circuits. Please be very careful and operate by qualified personnel
only.
There is a risk of electric shock, strong electromagnetic interference,
damage of electronic equipment in case of improper use.
The registered by shunt signal is applied to the oscilloscope input. Please
ground the oscilloscope obligatory. It is not recommended the connection
of the shunt directly to the oscilloscope input without using of the
attenuator. This attenuator may prevent the damage of the oscilloscope in
case of improper operation.
It is strongly prohibited to connect or disconnect the shunt to/from the
system while HV power supplies or HV pulse generators are switched on.
Operation safety
Please read this manual before installing and using of the shunt.
Before using the product, make sure that all cables are applicable and not
damaged. All the connectors should be clean and dry, free from dust, dirt
and any obstacles.
The shunt is designed to work in normal laboratory conditions. Avoid dust,
humidity and temperature extremes. Do not place the shunt in any place
where it may become wet.
If you encounter any technical problem with the shunt, please contact with
Megaimpulse Ltd. Do not try to repair it by yourself.
CS-10/500 shunt user manual 3

TECHNICAL SPECIFICATION OF CS-10/500
CURRENT MEASUREMENT SHUNT
Current/voltage transfer ratio:
without 20dB attenuator
with 20dB attenuator
10 A/V
100 A/V
Peak pulse current 500 A
Pulse polarity any
Rise time (transient response) 1 ns
Internal impedance
(in measured power circuit) 0.2 Ohm
Maximum dissipated power 2 W
Output connector SMA
Size (for reference only) 27 х38 х18 mm
3
Suitable wire diameter 0.8mm – 2mm, AWG20 – AWG12
To prevent overheating and damage of the shunt please do not exceed the
maximum dissipated power.
The dissipated power can be estimated:
ftRIP
shm
×××=
2
, where
I
m
– peak pulse current,
R
sh
– internal shunt resistance 0.2 Ohm,
t– pulse width,
f– pulse repetition rate.
MEGAIMPULSE LTD. 4

* All the dimensions are in mm and are given for reference only;
Output connector to oscilloscope is SMA type;
Two power circuit screw terminals are suitable for the wires with
diameter 0.8mm – 2mm (AWG20 – AWG12);
The shunt should be installed into the ground wire break between the
load and HV coaxial cable ground contact, i.e. cable braid. HV contact
of the shunt (top on the figure) should be connected to the load, ground
shunt contact (bottom in the figure) should be connected to HV coaxial
cable ground contact.
Fig. 2. The drawing of CS-10/500 current measurement shunt.
CS-10/500 shunt user manual 5

PUTTING THE SHUNT INTO OPERATION
Please follow strictly the next steps. It helps to prevent damage of the
equipment and personnel injury.
Step 1.
Unpack the shunt and check the presence into the package of the following items:
-CS-10/500 current measurement shunt;
-20dB 18 GHz attenuator with SMA connectors;
-coaxial cable assembly with SMA connectors;
-SMA-to-BNC adapter.
Step 2.
Ground the oscilloscope and other testing equipment if required.
Step 3.
Connect the shunt serially with the load. It is very important to install the shunt in
proper place and in proper orientation. Otherwise it may results in the damage of
the connected equipment. The shunt should be installed in the break of the load
ground wire, i.e. between HV coaxial cable ground wire (cable braid) and load
ground contact (please see Fig.3).
Fig. 3. Set up of CS-10/500 current measurement shunt serially with the load.
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The shunt has two screw terminals for connection to the power circuit: ground
contact which is connected with the metal body of the shunt, and isolated HV
contact. Please attach shunt ground contact to the ground of HV coaxial cable and
attach HV shunt contact to the load ground contact correspondingly; the same as is
shown in Fig.3.
It is recommended to keep the total length of the wires between HV
coaxial cable, the load and the shunt below 10 cm.
Attach the signal coaxial cable assembly directly to SMA connector of the shunt,
and connect the other cable assembly end to the oscilloscope through 20dB
attenuator and SMA-to-BNC adapter. The oscilloscope should have 500 MHz or
more bandwidth for correct measurement.
Fig. 4. Improper connection of the shunt which may results in damage of the
equipment.
Step 4.
Set the following oscilloscope operation regime (see Fig. 5):
-Input impedance of the oscilloscope channel – 50 Ohm;
-External attenuation – 100:1 (100x);
-Couping – DC;
-Bandwidth – full;
-Scale 50 V/div or 100 V/div.
CS-10/500 shunt user manual 7

Fig.5. Setting of the oscilloscope CH1 for operation with the shunt.
Do not connect the shunt to the oscilloscope input directly without 20dB
attenuator. It may result in permanent damage of the oscilloscope input
channel. The pulse voltage amplitude of the signal from the shunt is more
than 20V, therefore, it should be divided in 10 times or more.
Step 5.
Switch on the high voltage pulse generator and register pulse current waveform
through the load.
The simple barrier discharge set up with CS-10/500 current measurement shunt is
shown in Fig. 6.
The simultaneous pulse voltage and current measurement by Tektronix P6015A
probe and CS-10/500 shunt is shown in Fig. 7. Please connect the oscilloscope
ground clip contact just to the ground contact of the shunt. It should be noted that
simultaneous voltage-current measurement may lead to higher interference and
noisy registered signal.
MEGAIMPULSE LTD. 8

Fig. 6. CS-10/500 current measurement shunt serially connected with the load.
One can see output HV coaxial cable fixed by the clip, simple barrier
discharge load made of two copper foils separated by polyimide film and
CS-10/500 shunt.
Fig. 7. Connection of P6015A probe and CS-10/500 shunt for simultaneous pulse
voltage and pulse current measurement.
CS-10/500 shunt user manual 9

WARRANTY
Please see your sales agreement to determine the warranty period and warranty
condition. Warranty terminates if the shunt label is removed as well as in case of
mechanical damage of the shunt or improper operation.
MEGAIMPULSE LTD. 10