HP 8340B Manual page 30

4-5. MAXIMUM LEVELED OUTPUT POWER AND POWER ACCURACY
TEST (Cont'd)
HP 83408/41B
UNDER TEST
Figure 4-5.
Procedure
MAXIMUM LEVELED POWER
1. Connect the equipment as shown in Figure 4-5. Connect the 10 dB pad and crystal detector to the
DUT RF output and connect the detector output to the oscilloscope channel A input. Allow the
equipment to warm up for one hour.
2. Press [INSTRPRESET]. Press [PEAK] o n. Press [STOPFREQUENCY] and enter [2]
Adjust the oscilloscope to view the swept output of the crystal detector.
In Band 0 (10 MHz to 2.3 GHz), the crystal detector may pass a portion of the RF signal. This RF
feedthrough may be visible on the low frequency portion of the oscilloscope trace.
Also, as the power in Band 0 is increased toward maximum leveled, the level of the harmonics
may increase and cause a perturbation in the swept response. This will cause the maximum
power indication on the oscilloscope to increase without causing the UNLEVELED indicator to
light. Therefore, flatness is only specified at
3. Press the [POWERLEVEL] key and, using the front panel rotary knob, increase the power level
until the UNLEVELED indicator comes on. Slowly decrease the power level until the UNLEVELED
indicator just goes off. Note the ENTRY DISPLAY power indication.
4-28
Performance Tests
Maximum Leveled Output Power and Power Accuracy Test Setup
-4-10 dBm in Band 0.
=
OSCILLOSCOPE
[3] [GHz].
[.]
HP 8340B/41B