HP 85020A Operating And Service Manual page 28

Operation
Model 85020A/B
3. Perform an OPEN/SHORT calibration as follows:
Press 8756A
MAIN MENU
soft keys
[CAL] [OPEN/SHORT] [CHAN 1].
Connect the 75-ohm calibrated short to the test port of the
85020B, and press
[STORE SHORT]
to store the short calibration
data. Remove the short and leave the test port open. On the
8756A press
[STORE OPEN]
to store the open calibration data.
On the 8756A Channel
1
press
[DISPLAY]
until
M-MEM
is
selected. The Channel 1 normalized trace will be displayed.
4. Connect the minimum loss pad to the 85020B test port. Leave
the other end of the minimum loss pad unterminated.
5. On the 8756A press
[CURSOR].
The return loss of the
unterminated minimum loss pad (5.7 dB in each direction) will
be displayed. The display should read -11.4 dB +2 dB.
Figure 3-3. 85020B Operator's Check (2 of 2)
SWEEP
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BLANK
SWEEP
OSCILLATOR
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RF
PLUG-IN
SCALAR
NETWORK
ANALYZER
RF
OUT
DEVICE
UNDER
TEST
DETECTOR
BRIDGE
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For 75£2 measurements using the 85020B, refer to paragraph 3-16.
3-8
Figure 3-4. Typical Measurement Setup Using 87'56A