|
Current Monitor Table for Pulse Applications
|
Model Number
|
Output
Sensitivity
Volts/Amp
|
Hole
Diameter
inch
|
Max. Peak Current
kA
|
Droop
%/ms
|
Usable
Risetime
Nano-seconds
|
Saturation No Bias
∫idt
As
|
Saturation
With Bias
∫idt
As
|
|
CM-100-M
|
1
|
0.5
|
0.5
|
50
|
8
|
0.0004
|
0.0015
|
|
CM-10-M
|
0.1
|
0.5
|
5
|
2.5
|
12
|
0.005
|
0.015
|
|
CM-1-M
|
0.01
|
0.5
|
50
|
0.4
|
60
|
0.05
|
0.17
|
|
CM-100-MG
|
1
|
0.5
|
0.5
|
20
|
10
|
0.0008
|
0.003
|
|
CM-10-MG
|
0.1
|
0.5
|
5
|
1.0
|
10
|
0.008
|
0.03
|
|
CM-1-MG
|
0.1
|
0.5
|
50
|
0.1
|
50
|
0.04
|
0.15
|
|
CM-500-L
|
5
|
1.5
|
0.1
|
38/µs
|
3
|
0.0002
|
0.0005
|
|
CM-100-L
|
1
|
1.5
|
0.5
|
50
|
5
|
0.0015
|
0.0045
|
|
CM-10-L
|
0.1
|
1.5
|
5
|
1.0
|
10
|
0.06
|
0.15
|
|
CM-1-L
|
0.01
|
1.5
|
50
|
0.04
|
60
|
0.6
|
1.75
|
|
CM-01-L
|
0.001
|
1.5
|
500
|
0.02
|
350
|
2.0
|
6.0
|
|
Model Number
|
Output
Sensitivity
Volts/Amp
|
Hole
Diameter
inch
|
Max. Peak Current
kA
|
Droop
%/ms
|
Usable
Risetime
Nano-seconds
|
Saturation No Bias
∫idt
As
|
Saturation
With Bias
∫idt
As
|
|
CM-100-H
|
1
|
2.0
|
0.5
|
30
|
10
|
0.004
|
0.015
|
|
CM-10-H
|
0.1
|
2.0
|
5
|
0.7
|
25
|
0.25
|
0.9
|
|
CM-1-H
|
0.01
|
2.0
|
50
|
0.03
|
80
|
1.5
|
5
|
|
CM-01-H
|
0.001
|
2.0
|
500
|
0.006
|
350
|
2.0
|
8
|
|
CM-100-B
|
1
|
2.37
|
0.5
|
25
|
15
|
0.005
|
0.015
|
|
CM-10-B
|
0.1
|
2.37
|
5
|
0.65
|
35
|
0.2
|
0.9
|
|
CM-1-B
|
0.01
|
2.37
|
50
|
0.035
|
80
|
1.5
|
6
|
|
CM-01-B
|
0.001
|
2.37
|
500
|
0.012
|
700
|
4.0
|
15
|
|
CM-100-C
|
1
|
3.5
|
0.5
|
20
|
17.5
|
0.008
|
0.025
|
|
CM-10-C
|
0.1
|
3.5
|
5
|
0.3
|
35
|
0.4
|
2.0
|
|
CM-1-C
|
0.01
|
3.5
|
50
|
0.02
|
100
|
4.5
|
15
|
|
CM-01-C
|
0.001
|
3.5
|
500
|
0.003
|
700
|
10
|
40
|
|
Model Number
|
Output
Sensitivity
Volts/Amp
|
Hole
Diameter
inch
|
Max. Peak Current
kA
|
Droop
%/ms
|
Usable
Risetime
Nano-seconds
|
Saturation No Bias
∫idt
As
|
Saturation
With Bias
∫idt
As
|
Current-Time Product
This spec is the most common limitation for high current applications. If
the product of peak current and pulse width exceeds the amp-second-product rating,
the core of the monitor saturates and the displayed signal is greatly diminished
from that moment on. This limit is specified for a single, unidirectional pulse.
For repetitive pulses, the limit is reduced further as the repetition rate increases.
If none of the listed models
have a satisfactory current-time product, it is
often possible to meet the requirements by increasing
the cross section of the core. A small DC bias
will also extend the point of saturation (see
section on Saturation
and Bias). Physical reversing of the monitor
will approximately double the ampere second limit,
but only for one pulse. Saturation does not damage
the monitor.
Droop
In pulse applications, the output voltage signal
from the monitor will always decay more rapidly
than the current pulse being measured. A model
with lower sensitivity tends to have a lower droop.
DC current will increase (see section: Effect
of DC Current on Lower Db Frequency.)
Usable Risetime
This spec lists the fastest risetime recordable while keeping the reproduced
pulse to less than 10% under- or over-shoot.
Maximum Peak Current
This value determines the maximum current the monitor can tolerate. This limitation
is primarily determined by the voltage breakdown rating of the connector, which
is typically 500V. Also important is the voltage and power handling capability
of the 50Ω feed-through termination at the scope.
Sensitivity
The monitor sensitivity, expressed in output voltage
per Amp of primary current, should consider the
sensitivity of the oscilloscope, which is generally
adjustable over a wide range. Monitors with lower
sensitivity have generally less droop and higher
current rating and exhibit higher current-time
product values.
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