HP 85027A/B/C Performance Tests
Procedure
1.
Set up the equipment as shown in Figure 4-5, preset the instruments and allow 30
minutes for warm-up.
2.
Adjust the RF plug-in as required to 7 dBm at 50 MHz CW.
3.
Set the attenuator to 0 dB attenuation.
4.
On the analyzer, turn on the cursor and press [MEAS-->MEM] and
[MEAS-MEM]. This should result in a 0 dB reading.
5.
Step down the attenuator 10 dB at a time and note the cursor readings on the
appropriate lines of Table 4-3.
6.
All of the test results should be within the specifications as tabulated in column
two of Table 4-3. However there is a source of error which can adversely affect
the results. This error is that of attenuator inaccuracy: the attenuator at a
nominal setting of, say 10 dB, may not actually attenuate 10 dB.
To overcome this error, refer to the attenuator’s calibration data and use the
actual attenuation value for each setting.
7.
If after removing the source of cr1-or from the test results as noted above you
believe that the bridge still does not meet its specifications, refer to Section 8,
Troubleshooting.
8.
If you are using an HP 8757A with the bridge and wish to test its DC dynamic
power accuracy, return to the SYSTEM menu, select DC mode and perform a
short/open calibration by pressing these keys: [SYSTEM] [MODE] [CAL]
[SHORT/OPEN] [DISPLAY]and [MEAS-MEM].
9.
Perform steps 3 through 8 and enter the results in the fourth column of Table 4-3.
Table 4-3. Dynamic Power Accuracy Performance Test Record
Delta Power
AC/DC Spec
AC Test Result
DC Test Result
Nominal
Actual
0 dB
________
Ref
Ref
Ref
-10dB
______
-10±0.4dB
______
______
-20 dB
________
-20±0.4dB
________
________
-30
dB
________
-30±0.5dB
________
________
-40dB
______
-40±1.0dB
______
______
4-10
