Overview
Manual operation using front panel or PC - control via GPIB - Interface
Calibration Pulse Generators are indispensable for the test of emi - receivers, especially the pulse weighting curves which are specified in the standards.
Calibration Pulse Generators up to now
For many decades the Schwarzbeck Calibration Pulse Generators IGLK 2914 (Band A, 9 kHz - 150kHz and Band B, 150kHz - 30MHz) and IGU 2912 (Band C / D, 30MHz - 1GHz) have been recognised as world wide standard. Their mechanical relay contacts generate spectrum beyond 1GHz with both high voltage and high precision. The IGUU 2916 got auxiliary generators, which opened the pulse frequency range beyond 200Hz. So finally this limit of the mechanical relay contact has been overcome. Pulse frequency in the range of 0.1Hz to 20kHz became available. This means complete testing of emi - receivers including detectors for cispr - quasi - peak, average and peak / mil.
And now the IGUU 2918
- The enhanced auxiliary generators have an extended pulse frequency range from 0.1Hz to 1MHz (Band C/D). Now it is possible to test all previous detectors and additionaly also True RMS detectors.
- Rotary encoders and matrix - displays are used for pulse frequency and amplitude (main generator only) tuning and reading. The new keypad allows a direct entry of the desired frequency and amplitude. Pulse frequency is derived from a DDS-IC.
- The optional Coaxial Switching Unit KU 9618 connects one of the four outputs of the IGUU 2918 to the e. u. t., controlled by the IGUU 2918. This is very convenient and time saving because there is no need to change coaxial connections.
- The GPIB - Interface serves for complete PC-control of all generator functions. Automatic testing is possible by using interface and coaxial switching unit KU 9618.
| Technical Data | |
| Main Generators | |
| Pulse frequency range | 0.1Hz - 200Hz in 0.1Hz steps |
| Pulse frequency accuracy | 2.3·10-3Hz |
| Pulse shape | Almost rectangular |
| Pulse duration | Band A: 270ns, |
| Band B | 6ns Band C/D: 0,3ns |
| Pulse polarity | positive/negative (switchable) |
| Pulse level | (CISPR weighting Q.P.): Band A / B 10 - 70dB, in 1dB - steps, Band C / D 0 - 60dB, in 1dB - steps |
| Max. Output Voltage acr. 50? | 80 V - 110 V |
| Pulse Area at 60dB attenuator setting | Corresponds to CISPR 16 Standard equivalent to 1 mVrms across 50? with standardized Q.P. - Detector. |
| Frequency flatness | typ. + / - 0dB to - 0.5dB at upper frequency limit for Band A / B Band C: typ. + / - 0,5dB 30 - 100MHz (100MHz is reference frequency for level calibration). Level increase Between 200MHz and 800MHz + 0,5 to + 1dB, 800 - 1000MHz decrease to + / - 0dB to - 1dB. |
| Level Accuracy | |
| Band A / B | + / - 0,5dB at 50kHz, 1MHz |
| Band C / D | + / - 0,8dB at 100MHz. |
| Auxiliary Generators | |
| Pulse frequency ranges | Band A: 0.1Hz – 2kHz Band B: 0.1Hz – 50kHz Band C/D: 0.1Hz – 1000kHz 0.1Hz – 999.9Hz, 0.1Hz steps 0.1kHz – 1000kHz, 0.1kHz steps |
| Pulse frequency accuracy | 2.3·10-3Hz |
| Pulse duration (values for orientation) | Band A: 260ns, Band B: 6.5ns, Band C / D: 500ps |
| Pulse level | ((CISPR weighting Q.P.): Band A / B 60dB fixed level Band C / D 40dB fixed level |
| Frequency flatness | Band A / B same as 1. Main Generators Band C (D): typ. + / - 0,75dB 30 – 1000MHz |
| Dimensions | W x H x D : 447mm x 180mm x 460mm |
| Weight | 12kg |
Warning
Both Main Generators of this Calibration Pulse Geerator are so powerful that they may destroy (burn out) the front end of spectrum analysers and receivers. This is also true for external preamplifiers, attenuators and any kind of auxiliary equipment. Input protection circuitry and autoranging most often do not respond fast enough and are no effective protection here. One way for safe operation is to insert a fixed attenuator between generator output and receiver input. Choose an attenuator with suitable pulse dissipation and frequency range. Increase generator output voltage slowly beginning at the lowest possible level. Increase output voltage only as high as needed for your measurement. It may sometimes occur with slow pulse frequencies (< 20Hz) that the receiver reading doesn't increase when the generator voltage increases. This is usually caused by receiver overload or saturation. In this case do not increase generator level any more. Refer to the instruction manual of the equipment under test and stay within these limits.
