Service manual

6 Agilent 382A Operating and Service Manual
Operation
at all frequencies. Therefore, above cutoff of the TE
21
mode, in the top
one-quarter of the frequency band, some sharp resonance could occur unless
these modes are suppressed. Polyiron grooves are added in the center section
to overcome these sources of error.
Table2 shows the test instruments and accessories required for performance
checking. Test instruments other than those listed may be used provided
their performance equals or exceeds the critical specifications.
Table 2 Test Equipment Required
Instrument Type Critical Specifications Recommended Agilent
Model
(if applicable)
Sweep Oscillator
1
1. May need additional TWT amplifier depending upon band, output, sensitivity of detector, etc. A TWT
amplifier should not be used unless necessary due to increased noise level.
Sweep Oscillator*
Internal AM: 1000 Hz square wave
Leveling: ± 0. 5 dB from external signal
/Sweep Output: for recorder
Directional Couplers (3)
(1 with calibration curve)
Coupling: 10 dB ± 0. 4 dB
Directivity: > 40 dB
752C
Calibrated Variable Attenuator Attenuation: 0 to 50 dB
Insertion Loss: < 1 dB
SWR: < 1. 15 over entire range
382A
Crystal Detectors (3) Frequency: band of 382A
Response: flat, no tuning
SWR Meter Frequency: 1000 Hz
Input Impedance: 200K ohm
Output: compatible with Recorder
WG-Coaxial Adapter SWR: < 1.25 281A
X-Y Recorder with
1000 Hz Filter
Compatible with SWR Meter and Sweep Oscillator used
Waveguide Short Frequency: band of 382A
Moveable Load Frequency: band of 382A SWR: < 1. 0 1