Chapter 2 133
Making Adjustments
20. Checking the External ALC for Option 010 or 011
Figure 2-31 External ALC Verification Adjustment
10.Connect the equipment as shown in Figure 2-31. For Option 011
only: Use the 75 Ω power sensor with an adapter, instead of the 50 Ω
power sensor.
75 Ω input only: Press
AMPLITUDE, More 1 of 2, AMPTD UNITS, dBm.
11.Set the DMM to measure dc volts.
12.Set the analyzer by pressing the following keys.
FREQUENCY, 300, MHz
SPAN, 0, Hz
AUX CTRL, TRACK GEN, SRC PWR ON OFF (ON), 2, −dBm.
13.Ensure that the power meter reads −2 ±2 dB, then press
RANGE
HOLD on the power meter.
14.On the analyzer, press
More 1 OF 2, ALC MTR INT XTAL (MTR).
15.Adjust the SRC PWR for 0 dBV by turning the front-panel knob on
the analyzer. Note that the display will read the power dBm.
16.Note the voltage on the DMM. This is the error at source power
0 dBV. Record the automatic leveling control (ALC) voltage in the
space provided.
ALC voltage at 0 dBV # = ______________volts dc
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