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4. Remove the 50
Calibrator Mainframe goes to STBY.
5. Reconnect the 50
6. Program the Calibrator Mainframe output for 5.000 V, AC (OUT VAL blue
softkey).
7. Press on the Calibrator Mainframe to activate the output and verify that the
OPR display timer increments.
8. Remove the 50
Calibrator Mainframe goes to STBY.
3-61. Hardware Adjustments
Hardware adjustments must be made to the leveled sine and edge functions each time the
5820A is repaired. In addition to the adjustment procedures, this section provides lists of
the required equipment and some recommendations on models that have the capabilities
required by these procedures. Equivalent models can be substituted if necessary.
3-62. Equipment Required
The following equipment is necessary for performing the hardware adjustments
described in this section. The models listed are recommended for providing accurate
results.
Standard adjustment tool for adjusting the pots and trimmer caps
Extender Card
Oscilloscope Mainframe 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, or equivalent)
Cable provided with 5820A
Spectrum Analyzer (Hewlett-Packard 8590A)
3-63. Adjusting the Leveled Sine Wave Function
There are two adjustment procedures that need to be made for the leveled sine wave
function. The first procedure adjusts the balance out of the LO VCO so that the signal is
balanced between the two VCOs. The second procedure adjusts the harmonics.
3-64. Equipment Setup
This procedure uses the spectrum analyzer. Before you begin this procedure, verify that
the Calibrator Mainframe is in leveled sine wave mode (the Levsine menu is displayed),
and program it to output 5.5 V p-p @ 600 MHz. Press to activate the output.
Refer to Figure 3-7 for setup connections and connect the Calibrator Mainframe to the
Spectrum Analyzer. Adjust the Spectrum Analyzer so that it displays one peak across its
horizontal center line. The far right of the peak is fixed at the far right of the center line,
as shown below.
3-65. Adjusting the Leveled Sine Wave VCO Balance
Once you have completed the setup described above, perform the following procedure to
adjust the VCO balance for the leveled sine wave function.
feedthrough termination before 60 seconds and verify that
feedthrough termination to the end of the N to BNC cable.
feedthrough termination before 60 seconds and verify that
Calibration and Verification
Hardware Adjustments
3
3-59
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