Procedure - Keysight 537A Operating Note

Table 3
Instrument type
Low-pass filter(s)
Termination (s)
[a] Two single directional couplers connected as a dual directional coupler can also be used.

Procedure

1 Connect the equipment as shown in
2 Set the analyzer control to 0 dB.
3 Set CHANNEL A OFFSET CAL switch to OFF.
4 Press CHANNEL A DISPLAY POSITION push button.
5 Adjust CHANNEL A screwdriver adjustment marked POSITION to place trace on the center
graticule. Increase resolution and make fine adjustment.
6 Place short on reflectometer.
7 Press CHANNEL A push buttons marked DISPLAY R and 10 dB/DIV
8 Set the sweep oscillator to sweep the band of interest.
9 Adjust the sweep oscillator output power level to place the trace on the second graticule below
the center graticule. (Power input is -20 dBm to the R detector.)
10 Press CHANNEL A push button marked DISPLAY A/R.
11 Turn CHANNEL A OFFSET CAL control to ON and adjust the OFFSET CAL control to place the
trace on the center graticule.
12 Increase the dB/DIV resolution by steps to 0.25 dB/DIV if necessary, adjust the OFFSET CAL
control to return the trace to the center graticule.
13 Disconnect the short from the reflectometer test port.
14 Connect the 537A under test to the reflectometer test port by disconnecting the short and
inserting the properly terminated 537A under test.
15 Use CHANNEL A OFFSET dB thumbwheel to return the trace to the center of the screen, or as
close as possible.
16 Read the return loss at the CHANNEL A OFFSET dB window and on the oscilloscope. Return
loss is the total indication of both the CHANNEL A OFFSET dB window and the trace on the
oscilloscope. Add the trace indication to the window reading if the trace is below the center
graticule, subtract if above.
Keysight 537A Operating Note
Equipment (continued)
Suggested Keysight model
Figure
GHz or connector type
700 MHz cutoff
1.2 GHz cutoff
2.2 GHz cutoff
4.1 GHz cutoff
APC-7
Type-N male
2.
Performance Test
17