Table of Contents
Advertisement
Model 423A/8470A
Connect output of CW generator to power meter.
Measure adjusted levels (set in step b) of CW gener¬
ator output. The peak power of the pulse envelope
observed in step a is equal to the output power of
the CW generator.
28. Reflectometer Application. For information
about reflectometer systems and measurements,
see HP Application Note Index, copies of which
are available upon request.
29. Harmonic Frequency Comparison Measure¬
ment Application. The detector can be used as a
mixer in harmonic-frequency comparison measure¬
ments (see HP Application Note Index for further
information).
30. PERFORMANCE TESTS
31. The following paragraphs suggest methods to
use for testing detector specifications. For these
tests refer to the manuals of the equipment involved
for operating instructions.
32. Frequency Response Test
a.
Using signal sources covering 10 MHz to
18 GHz with a 10 dB isolating attenuator and a
power meter, connect power sensor to attenuator.
Adjust RF power level to —20 dBm input to power
sensor.
b.
Without changing RF power level of sig¬
nal source, disconnect power sensor.
c.
Connect detector to attenuator. Measure
dc voltage output from detector and record meas¬
urement.
d.
Change frequency of signal source and re¬
peat steps a through c.
e.
Since the detector follows a square-law
response at this power level, its output is propor¬
tional to power (P^g = 10 log VQ). Total variation
of detector readings should meet specifications (see
Table 1) for all frequencies of interest across the
band.
NOTE
Multiple mismatch errors caused by atten¬
uator SWR, power meter SWR, and detec¬
tor SWR should be taken into account
,
as
well as the accuracy of the indicator used
to measure the detector's output.
Page 5
33. High Level Sensitivity Test
a.
Using signal sources covering 10 MHz to
18 GHz and a dc voltmeter or oscilloscope as the
indicator, connect detector to signal source. Ad¬
just RF power level for a 100 mV detected output
from detector.
b.
Disconnect detector from signal source
and measure RF output level. The RF output
level should be < 0.35 mW.
c.
Repeat steps a and b for all frequencies
of interest across the band.
34. Low Level Sensitivity Test
a.
Using a signal source (covering 100 MHz
to 1 GHz), a 10 dB attenuator, and a power meter,
connect attenuator to signal source and power sen¬
sor to attenuator. Adjust RF power level for
—20 dBm output from attenuator. Verify the am¬
bient temperature.
b.
Disconnect power sensor from attenuator
and connect detector. Measure dc voltage output
from detector. The output should be > 4.0 mV
at 25° C. The sensitivity slope is typically
-0.015 dB/°C from 0°C to +55° C.
NOTE
Multiple mismatch errors caused by atten¬
uator SWR, power meter SWR, and detec¬
tor SWR sould be taken into account, as
well as accuracy of indicator used to meas¬
ure detector's output.
35. Match Test (SWR)
36. To verify the detector's SWR specifications,
use any system whose measurement accuracies for
SWR (residual SWR) are known.
37. ADJUSTMENTS
38. The detectors have no internal adjustments.
39. REPLACEABLE PARTS
40. The succeeding paragraphs contain informa¬
tion pertaining to replaceable parts (see Table 2)
and the ordering of replaceable parts for the
Models 423A, 8470A, and 11523A.
41. To order a replacement part, address order or
inquiry to the nearest Hewlett-Packard office (see
Advertisement
Table of Contents
