| DCV-1 | Documentation of calibration values |
| DCV-2 | Documentation of calibration values |
| DCV-ZP | Printout of DCV (additional, in combination with DCV-Option only) |
| ELS3.C3 | Three years of standard calibration coverage based on the R&S recommended calibration interval - includes test data. The first calibration is included with product delivery with 2 additional depot calibration(s). |
| ESL3.C5 | Five years of standard calibration coverage based on the R&S recommended calibration interval - includes test data. The first calibration is included with product delivery with 4 additional depot calibration(s). |
| ESL3.R3 | Three years of depot repair coverage, including standard recalibration and test data if necessary to complete the repair. First year of repair coverage is provided by the 12-month new product warranty. |
| ESL3.R5 | Five years of depot repair coverage, including standard recalibration and test data if necessary to complete the repair. First year of repair coverage is provided by the 12-month new product warranty |
| FSL-B10 | GPIB interface |
| FSL-B22 | RF preamplifier gain 20 dB |
| FSL-B30 | DC power supply 12 - 28 V |
| FSL-B31 | NiMH battery pack |
| FSL-B4 | OCXO reference frequency |
| FSL-B5 | Additional interfaces video/IF-output, power meter 28 V - DC for noise source |
| FSL-B8 | Gated sweep function for FSL and for ZVL with ZVL-K1 |
| FSL-K30 | Application firmware for noise figure and gain measurements for FSL and for ZVL with ZVL-K1 |
| FSL-K7 | Analogue demodulation AM/FM/PM for FSL and for ZVL with ZVL-K1 |
| FSL-K9 | Power sensor measurements with NRP |