Compact Immunity Test System   Conducted Immunity


The CIT-10 is a complete test system for conducted RF-immunity tests according to IEC/EN 61000-4-6, ISO 11452-4, MIL-STD 461 CS114, SAE-J1113-2, DC 10614 and similar standards. Its internal RFgenerator and RF-power amplifier produce output signals with max. up to 150 W within a frequency range from 100 (10) kHz up to 400 MHz. Generated signals are measured via one of the max. 3 internal RFVolt-meters. Furthermore via an optional, internal directional coupler forward and reflected power can be measured. The whole test system allows full au-tomatic tests for the specified frequency range. As a “stand-alone” test system the CIT-10 is convincing by its easy and comfortable handling and the excellent cost-performance ratio. Addons like coupling/decou-pling devices are available as well.

Special Features

Conducted RF immunity tests acc. to IEC/EN61000-4-6 and BCI tests acc. to ISO 11452-4 and MIL-STD 461 CS 114

Signalgenerator,RF-power amplifier, RF-power meter and directional coupler (optional) in one 19”-case

Stand-alone operation possible with optional available netbook

Control-software included

Most important parameters are shown on an integrated display

Automatic EUT-monitoring

Operation via USB port of a PC or Notebook

Complete range of CDNs available


Immunity Testing
Testing according to IEC/EN 61000-4-6, ISO 11452-4, MIL-STD 461 CS114, DC10614 can be performed automatically.



Generation, amplification and 
verification of RF-Signals

The internal amplifier amplifies any signal from 100 (10) kHz up to 400 MHz. By using the internal generator a desired narrowband signal can be generated. Signals up to 30 dBm can be measured at the same time. If a directional coupler is installed, forward and reflected power are measured as well.

Technical specifications

(external in-/output)                          CIT-10
Frequency range                            10 kHz to 400 MHz
Measuring range                            +30 dBm to -40 dBm
Accuracy                                         ±0.5 dB
VSWR                                              < 1.1 : 1
Input                                                BNC, 50 Ω

RF Voltmeter

Technical specifications

Amplifier                       CIT-10        
Frequency Range        Power       Gain             Distortion
10kHz – 250 MHz        75 W         51 dB           < -20dBC

                                                      ± 1.5 dB       @ 50W
100kHz – 400 MHz      75 W        51 dB           < -20dBC

                                                      ± 1.5 dB       @ 50W
100kHz – 250MHz       75 W         46 dB ±       < -20dBC

                                                      1.5 dB          @ 20W
Input impedance        50 Ω, VSWR < 1.5:1
Output impedance     50 Ω, VSWR < 1.5:1


RF-Signal Generator                      CIT-10
Output                                             BNC, 50 Ω
Frequency range                            10 kHz to 400 MHz
Frequency resolution                    1 Hz
Output level range                          0 to – 63 dBm
Output level resolution                  0.1 dB
Ouput level accuracy                     ±0.5 dB (± 1 dB max)
Accuracy (frequency)                    ±5 ppm (TCXO)
Harmonics                                       < -30 dBc
Non harmonics                               < -45 dBc
Amplitude modulation (internal)    0 to 100 %; resolution 0.5%
                                                         (internal AF-Generator)
Amplitude modulation (external)   BNC jack 1 Hz to 100 kHz,
                                                         0 to 100% Input

                                                         impedance > 100 kΩ
Pulse modulation                           variable duty cycle 10 – 90 %;
                                                         resolution 1 % (internal AF                                                               Generator)
VSWR                                              < 1.5:1

EUT-fail input                       CIT-10
Input resistance                   2.2 kΩ
Level                                     TTL/CMOS compatible,

                                              optical decoupled

EUT-Monitor input               CIT-10
Input voltage                        0-10 V
Input impedance                  100 kΩ


Test (2)

The menu option <Test> offers the selection possibilities <Complete Test>, <Selective Test> and <Protocol>. The settings for a test, e.g. start and stop frequency, step width and test voltage are made automatically via the calibration file of the selected coupling unit. It is now possible to decide whether the test is to be performed exactly according to these pre-settings, i.e. exactly as in the calibration, or whether modifications of the pre-settings shall be admissible. If the calibration run was performed, for example, for a test voltage of 10 V, and the test is to be performed now with 3 V without having to perform a new calibration run for this purpose, this can be done by selecting menu item <Extrapolation>.

The CIT-10 is a PC-controlled test equipment. It can be operated by any commercial IBM compatible PC (Microsoft® Windows software) via USB port. All settings of the equipment, e.g. start frequency, stop frequency,
step width, test voltage etc. are made by means of the control software which is also included in the delivery. The three functional units RF-signal generator, RF-power amplifier and RF-voltmeter are set automatically by the software, depending on the pre-set test parameters. Each component, however, may also be called and operated as separate measuring and testing equipment. This means: using the CIT-10 as testing system, you have three full, additional “single units” at your disposal, for which separate inputs and outputs are available as BNC connections. Due to the computer-aided control of the CIT-10, any modifications which may become necessary, for example, due to the revision of standards, may be performed without problems and without having to manipulate the hardware of the equipment.

Amplifier monitor                 CIT-10
Output                                   BNC, 50 Ω
Level                                     -40 dB (amplifier output), ±3 dB

Calibration (1)

Is a suitable measuring instrument connected to the specified serial port of the CIT-10, EUT can be monitored automatically. Data are shown graphically. During all test routines the amplifier output is monitored in a bar display. This guarantees correct tests. In the case of <Complete Test>, a test is performed over the complete selected frequency range; in this case the test frequency is increased by the control software according to the selected step width and the
entered dwell time. If there is a malfunction of the EUT, the test may be stopped at any time. It is then possible to either increase or reduce the frequency by any number of steps, as well as to switch on and off the modulation and test voltage. Besides, a description of the malfunction occurred may be entered in a comment line which is included in the test record.

<Selective Test> offers the possibility of testing the EUT at discrete frequencies. This can be done either with a fixed test voltage or, optionally, with a ramp function. In case of the ramp function, the start and stop voltage, the step width by which the test voltage is to be increased, as well as the dwell time between the individual steps may be preset by the tester.

The standard <Protocol> consists of the head of the protocol and a diagram which shows the test results. In the head of the protocol the date and time are taken over from the computer; in addition, details like temperature, air humidity, tester, as well as testing set-up and EUT, may be registered. The protocol may be printed directly. It is also possible to edit the protocol individually.

In <CDN-Calibration> the CDNs (Coupling/Decoupling Networks) serve to inject the test voltage into the lines to be tested and/or to decouple any connected peripheral equipment from the EUT. The characteristics of the CDNs as well as of the power amplifier are not absolutely linear over the whole frequency range, i.e. the amount of power required to generate a constant test voltage over the whole frequency range varies slightly, depending on the frequency. In the calibration run, the frequency-dependent output level of the signal generator, which is necessary for a constant test voltage, will be determined and stored in the software, together with the defined frequency range and the desired test voltage. The data records thus created may then be stored and recalled for tests.

Interface                                CIT-10
USB-A                                   Multimeter (for EUT control)
USB-A                                   Relay switching unit
USB-B                                   Connection to computer

RF-Voltmeter (internal, 2 pcs.)      CIT-10
Frequency range                            10 kHz to 400 MHz
Measuring range                            +53 dBm to – 0 dBm
Accuracy                                         ±0.5 dB

RF Generator                                  CIT-10
Output jack                                     BNC
Frequency range                            1 Hz to 100 kHz
Frequency resolution                     0.1 Hz
Output voltage                                0 to 1 V amplitude;         

                                                         resolution 5 mV
Accuracy (frequency)                      ±50 ppm
Signal                                              Sine wave / square wave /


When selecting <Self-calibration>, the test equipment will perform a self-calibration. In this case, the output of the signal generator must be connected to the input of the voltmeter.


The equipment is ready for operation immediately after connection with the USB port and installation of the drivers and the control software. After starting the control software, the main menu offers the manual control of <RF-Generator> and <RF-Power Meter>. Further options in the menu are <Calibration> (1) (<CDN-Calibration>, <Self-Calibration>) and <Test> (2) (<Complete Test>, <Selective Test>).

Directional coupler (optional)       CIT-10
Frequency range                            10 kHz to 400 MHz
Power                                              200 W CW
Insertion loss                                  0.5 dB max
VSWR                                              1.25 : 1 max
Directivity                                        20 dB min

General data                         CIT-10
Temperature range              0 to 40 °C
Warm-up time                       15 min.
Housing                                19”-Subrack or desktop case
Dimension (W x H x D)        449 mm x 133 mm x 435.5 mm
AC input                               100 – 240 VAC; 50/60 Hz
Volume of delivery               CIT-10 (basic equipment),
                                               cabling, system software

Part Number                         CIT-10/25 with integrated
                                               25 W RF-power amplifier

Part Number                         CIT-10/75 with integrated
                                               75 W RF-power amplifier
Part Number                         CIT-10/75MIL with integrated
                                               75 W RF-power amplifier

Part Number                         CIT-10/W without
                                              internal RF-power amplifier


Internal RF-Power Amplifier
Several amplifier modules are available. Highest output power can be 75 W over the specified frequency range. The amplifier input can be accessed via the back panel of the CIT-10, so that the amplifier can also be used with any external generator. 25 W and 75 W amplifiers are available as standard.



Amplitude Modulation
Frequencies generated by the generator can also be modulated with a LF signal. Modulation frequencies may vary from 1 Hz up to 100 kHz, modulation levels are available from 0 % to 100 %.



BCI-Tests with additional RF-Power Meter
Frequencies generated by the generator can also be modulated with a LF signal. Modulation frequencies may vary from 1 Hz up to 100 kHz, modulation levels are available from 0 % to 100 %.



Internal RF-Voltmeter
Accurate measurements of RF signals from -40 dBm up to +30 dBm are done by the internal RF-voltmeter which can be accessed (for separate use) via a BNC connector. Two internal voltmeters measure the forward and reverse power on an optional available directional coupler. If no directional coupler is installed, the output voltage of the amplifier is measured.



Internal RF-Signal Generator
As the internal generator generates its output signal without any internal mixing components, low harmonics and spurious frequencies are assured.



User defined signals
External signals (e.g. EUT-fail or external instruments) can be connected and monitored using the application software.


The CIT-1000 is a further development of the for years available and proven „CIT-10“, with the extended frequency range up to 1200MHz, stand-alone-operation via integrated Touch-Screen-PC as well as integrated directional coupler and power-meter for forward and reverse power measurement.

As usual with our CIT-series, all integrated instruments, like Signalgenerator, RF-Power-Amplifier and the 3-channel-RF Power Meter can be used as „stand-alone-unit“, too.

Hence, the Signal-generator and the RF-power-meter can also be used for radiated immunity tests acc. IEC/EN 61000-4-3. Furthermore an additional external RF-Power-amplifier could be connected to the CIT-1000 for this purpose.

Special Features

Conducted RF immunity tests acc. to IEC/EN 61000-4-6, BCI-tests acc. to ISO 11452-4 and MIL-STD 461

Signalgenerator, RF-Power-Amplifier, 3-channel power-meter and directional coupler combined in one 19“-case.

Stand-alone operation via integrated touch-screen-PC

Frequency-range 10kHz-1200MHz

With integrated amplifier 25W / 75W / 180W

Control-Software included

Temperature-mesuring-input for control and display of the BCI-clamp temperature

Interfaces: USB, LAN, GPIB

RF-Generator                                                                                                  CIT-1000
Two switchable outputs (only one can be used simultaneously)              2 x SMA
Frequency range                                                                                             9 kHz to 1.2 GHz
Frequency resolution                                                                                     1 Hz
Output level range                                                                                          0 to -63 dBm
Output level resolution                                                                                  0.1 dB
Harmonics                                                                                                       < 30 dBc
Spurious                                                                                                          < 45 dBc
Amplitude modulation (internal)                                                                   0 to 100%, resolution 1%
Amplitude modulation (external)                                                                  0 to 100% , max. Amplitude 1V = 100%, BNC jack
Pulse modulation (internal)                                                                           5 to 95%, resolution 1%
Pulse modulation (external)                                                                          DC…1MHz, 3,3/5V CMOS/TTL, BNC jack

Technical specifications

LF-Generator (modulation)                                                                            CIT-1000
Connector                                                                                                       BNC jack
Frequency range                                                                                            1 Hz to 100 kHz
Frequency resolution                                                                                     0.1 Hz
Signal                                                                                                              Sine wave / square wave / triangular
Amplitude                                                                                                        0…1 V

RF-voltmeter 2+3 (forward and reverse power)                                           CIT-1000
Connector                                                                                                        2 x SMA
Frequency range                                                                                             9 kHz to 1.2 GHz
Measuring range                                                                                             -40 to + 33 dBm + directional coupler typ. 40 dB

RF-Voltmeter 1 (test level)                                                                             CIT-1000
Connector                                                                                                       BNC jack
Frequency range                                                                                             9 kHz to 1.2 GHz
Measuring range                                                                                             -40 to +30 dBm

EUT-Monitor input                                                                                           CIT-1000
input voltage                                                                                                    0 to 10 V DC
resolution                                                                                                         2.5 mV
Input impedance                                                                                             100 Ω

EUT-failed input                                                                                               CIT-1000
Input signal                                                                                                      3,3/5V CMOS/TTL level
Detection mode                                                                                               status or edge controlled
Temperature measurement                                                                            10 to 100 °C (1039 to 1385 Ω) resolution < 1 °C (PT 1000)

SCPI interfaces                                                                                                CIT-1000
USB 2.0                                                                                                             USB-B
LAN, 100 Mbit                                                                                                   RJ45
GPIB (optional)                                                                                                Centronics

Digital I/Os                                                                                                       CIT-1000
Out                                                                                                                    4 Bit Digital out, 5 V CMOS/TTL
In                                                                                                                       4 Bit Digital in, 5 V CMOS/TTL

Interlock                                                                                                           CIT-1000
Closes at                                                                                                          R < 1 kΩ