4-10.
POWER SWEEP TEST (Cont’d)
Equipment
Power
Meter
HP 436A Option 022
Power Sensor
HP 8485A
Adapters
APC 3.5 (f) to APC 3.5 (f)
HP P/N S061-5311
(1 required if DUT
is
HP 8340B)
Type N
(in)
to APC 3.5 (f)
HP P/N 1250-1 744
(1 required if DUT is HP 8341 B)
Procedure
1. Connect equipment as shown in Figure 4-10. Connect the HP
8485A
Power Sensor to the Power
Meter. Allow a one hour warm up time. Set the Power Meter’s calibration switch to include 1 GHz,
then zero and calibrate the Power Meter before connecting the Power Sensor to the DUT.
2. Press the DUT’s [INSTRPRESET]. Press the [CW] key and enter [1] [GHz].
3. Press [SHIFT] [PWR SWP] to allow the ALC and RF step attenuator to be independently con-
trolled.
NOTE
The step up and step down keys control the RF attenuator. The numeric
key pad and rotary knob control the ALC power level.
4. Enter
[—]
[2] [0] [dBm]ALC
Power level to set the start of the power sweep
at —20 dBm. Press
[PWRSWP] and enter [2] [1] [dBm]to set the power sweep range to >20 dB (The maximum
power sweep range is from —20 dBm to maximum power).
5. Press the [MANUAL] key. Turn the rotary knob counterclockwise to find the beginning of the
power sweep (i.e., the power meter indication is at maximum and no longer changing). Record the
power meter indication.
NOTE
The POWER dBm display will indicate the approximate output power
during a very slow or manual sweep.
6. Rotate the rotary knob clockwise to find the end of the power sweep (i.e., the power meter
indication is at maximum and no longer changing). Record the power meter indication.
7. The difference between the power meter indications recorded in step S and step 6 must be =20
dB.
8. Press the [CW] key and enter
[51
[GHz].Set the power meter’s calibration factor switch to include
this frequency. Repeat steps S through 7 at CW frequencies of 10, iS, and, if the DUT is an
HP 8340B, 26 GHz.
4-54
Performance Tests
HP 8340B/41B