User`s guide

Chapter 4 119
Performance Tests
3. Multiple Response Rejection Test
Performance Tests
CAUTION When you are using an 11975A Amplifier with an 11974, you must set the
amplifier rear-panel ALC switch to ON before you connect the amplifier to the
test setup. If the ALC switch is left in the OFF position, the amplifier output
power is high enough to destroy the mixer diodes.
4. On the 11975A Amplifier, set the rear-panel ALC switch to ON, then connect the 8481A
Power Sensor to the free end of the cable installed on the OUTPUT connector of the
amplifier. Set the 436A Power Meter Cal Factor % to the appropriate value for a
frequency of 5 GHz.
5. Adjust the amplifier OUTPUT POWER LEVEL for a reading of +15.2 dBm
±0.1 dBm on
the power meter.
6. Connect the equipment as shown in Figure 4-1 on page 106.
CAUTION Turn off the ac power on the 8349B prior to connecting or disconnecting the
source module interface cable.
Turn off the ac power on the 11974-60028 Preselector Power Supply prior to
connecting or disconnecting the 11974.
On the 11974 rear panel, set the instrument select switches to the
appropriate settings before applying power to the 11974.
7. Enter the appropriate millimeter-wave source module frequency multiplication factor
into the synthesized sweeper by pressing
SHIFT and START FREQ and entering the
corresponding value for the band listed below:
for an 11974A:
2 Hz
for an 11974Q: 3 Hz
for an 11974U: 3 Hz
for an 11974V: 4 Hz
8. Set the synthesized sweeper for a CW signal at the frequency listed below:
for an 11974A: 26.5 GHz
for an 11974Q: 33.0 GHz
for an 11974U: 40.0 GHz
for an 11974V: 50.0 GHz
9. Activate external leveling on the synthesized sweeper by pressing
XTAL.
10.Adjust the output power of the synthesized sweeper for a reading of approximately
0 dBm on the 8349B display.