5080A
Service Manual
66
models if necessary.
Equipment Required
Table 44 is a list of the equipment necessary to make hardware adjustments to
the Product.
Table 44. Test Equipment for Hardware Adjustments
Test Equipment Recommended Model
Extender card Fluke PN 661865 (5800A-7006K Extender kit)
Oscilloscope and Sampling head
Tektronix 11801 with SD-22/26 or Tektronix
TDS 820 with 8 GHz bandwidth
10 dB Attenuator Weinschel 9-10 (SMA) or Weinschel 18W-10
Spectrum Analyzer HP 8590A
Cable supplied with SC200 Fluke
You will also need a standard adjustment tool for adjusting the pots and trimmer
capacitors.
How to Adjust the Leveled Sine Wave Function
This is one adjustment procedure for the leveled sine wave function that adjusts
the harmonics. To adjust the level sine wave function:
1. Set the Product into leveled sine wave mode.
2. Set the Product output to 5.5 V p-p at 50 MHz.
3. Push .
4. Connect the Product to the Spectrum Analyzer.
5. Set the spectrum analyzer so it shows one peak across the horizontal
centerline. The far right of the peak is fixed at the far right of the centerline, as
shown in Figure 19.
6. Set the spectrum analyzer to the parameters in Table 45.
Table 45. Spectrum Analyzer Parameters
Parameter Value
Start Frequency 50 MHz
Stop Frequency 500 MHz
Resolution Bandwidth 3 MHz
Video Bandwidth 3 kHz
Reference Level 20 dBm
7. Use the search function on the spectrum analyzer to find the reference signal.
The spectrum analyzer display will show the fundamental with the second
and third harmonics. This adjustment will set the second harmonic to -34 dBc.
The third harmonic can be at -39 dBc or more as shown in Figure 19.
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