1.2 GHz Active FET Probe Kit
Overview:
The CT4121 is a compact FET probe with
very high input resistance and low input
capacitance. With a 1.2 GHz bandwidth,
this probe is ideal for timing analysis or
troubleshooting high speed logic circuits, for
design verification of disk drives, as well as
for wireless and data communication design.
The CT4121 can measure up to ±40 V (DC +
AC peak). Compatible with oscilloscopes from
all major manufacturers, the probe is powered
by the included 9 V battery or direct from the
oscilloscope using the included USB power
lead.
CT4121
Datasheet
Features:
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1.2 GHz bandwidth (-3 dB)
Up to ±40 V (DC + AC peak)
Attenuation 10x
High accuracy (±2%)
Power indicator LED
SMD accessory kit
Technical data subject to change.
© Cal Test Electronics 2017.
caltestelectronics.com
All specifications apply to the unit after a temperature stabilization time of 20 minutes over an ambient
temperature range of 25 °C ± 5 °C.
Electrical Characteristics
Bandwidth (-3dB)
Rise Time (probe only)
Attenuation ratio
Accuracy
Input Dynamic Range (DC + AC peak)
Maximum Input Voltage (DC + AC peak)
Input Impedance
Output Voltage Swing
Offset (typical)
Adjustable output offset range
Noise (typical)
Source Impedance
Power Supply
Safety Specifications
1.2 GHz
291 ps
10x
±2%
±15 V
±40 V
1 MΩ // 3 pF typical
±1.5 V (driving 50 Ω oscilloscope input)
±5 mV
±28 mV
0.3 mVrms
50 Ω
9 V battery (included) or
CT4122 USB power lead (included) or
CT3723 power adapter (optional)
IEC 61010-031 CAT I
Mechanical Characteristics
Weight
Dimensions
Cable Length
200 g
83 x 19 x 14 mm
120 cm (Total)
Environmental Characteristics
Operating Temp/Humidity
Storage Temp/Humidity
Pollution Degree
Altitude
-10°C to 40°C / Up to 85% RH
-30°C to 70°C / Up to 85% RH
Pollution Degree 2
Operating: 3,000 m
Nonoperating: 15,300 m
Specifications are subject to change without notice. To ensure the most current version of this manual,
please download the current version from our website: caltestelectronics.com
Technical data subject to change.
© Cal Test Electronics 2017.
caltestelectronics.com
Performance Data Plots
Maximum Input Voltage Derating Curve
100
Voltage (V)
(DC + ACpeak)
10
1
10
5
10
6
10
7
Frequency (Hz)
Figure 1
Maximum Input Voltage Derating Curve
10
8
10
9
Input Impedance vs Frequency Data Graph
10
7
Input Impedance (Ohm)
10
6
10
5
10
4
10
3
10
2
10
1
1
10
1
10
2
10
3
10
4
10
5
10
6
10
7
10
8
10
9
Frequency (Hz)
Black - Measured by LCR meter
Grey - Simulated by Altium software
Figure 2
Input Impedance vs Frequency Data Graph
Technical data subject to change.
© Cal Test Electronics 2017.
caltestelectronics.com
Kit Contents:
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Active FET probe
50 Ω feed-through terminator (CT2944-50)
USB power lead (CT4122)
9 V battery
Offset adjustment tool
User manual
SMD kit
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(2) SMD test clip, gray (CT3659-8)
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(2) MicroLeads, 0.8 mm, Pin-Jack, 5 cm, Black/Red
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(2) MicroLeads, 0.8 mm, Pin-Jack, 10 cm, Black/Red
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(4) Ground pin, bent
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(6) Test tip, uninsulated, 0.8 mm x 11.6 mm
Technical data subject to change.
© Cal Test Electronics 2017.
caltestelectronics.com
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