4 Calibration Procedures
66 Keysight 33210A Service Guide
The flatness verification procedures use both a DMM and a Power Meter to make
the measurements. To correct the difference between the DMM and Power Meter
measurements, the Power Meter reference measurement level is adjusted to set
the 0.00 dB level to the DMM measurement made at 1 kHz. The flatness error of
the DMM at 100 KHz is used to set the required 0.00 dB reference.
The instrument internally corrects the difference between the high-Z input of the
DMM and the 50 Ω input of the Power Meter when setting the output level.
The reference measurements must also be converted from Vrms (made by the
DMM) to dBm (made by the Power Meter).
The equation used for the conversion from Vrms (High-Z) to dBm (at 50 Ω) is as
follows:
Power (dBm) = 10 log(5.0 * V
rms
2
)
Flatness measurements for the –10 db, –20d B, and –30 dB attenuator ranges are
verified as a part of the 0 dB verification procedure. No separate verification
procedure is given for these ranges.
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