Blanking Adjustment (Test 54); Preparing The Instrument - Agilent Technologies 8719ET Service Manual

Adjustments and Correction Constants

Blanking Adjustment (Test 54)

Blanking Adjustment (Test 54)
This adjustment sets the output power level during retrace. If incorrectly adjusted, the
first data points in a sweep may not be stable.
Required Equipment and Tools
Equipment Description
Power Meter
Power Sensor
Adapter 3.5-mm (f) to 3.5-mm (f)
Adapter 2.4-mm (f) to 2.4-mm (f)
Non-Metallic Adjustment Tool
Analyzer warmup time: 30 minutes.
Power meter warmup time: 30 minutes.

Preparing the Instrument

1. With the analyzer turned off, remove the top two corner standoffs and the top cover.
2. Locate the metal source assembly cover that is on the top-left, front-side of the
instrument.
3. Unplug the flexible SMB cables coming out of the source assembly cover.
The 8719ET/ES and the 8720ET/ES have 2 SMB cables. The 8722ET/ES have
NOTE
4 SMB cables. All cables are clearly marked for easy re-assembly.
4. Remove the 3 screws on source assembly cover and lift it off the frame.
5. Reattach the SMB cables to the proper connectors.
6. Turn the analyzer on. If it does not phase lock, check the cable connections.
7. Zero and calibrate the power meter and connect the power sensor to PORT 1
(REFLECTION port on the ET models).
8. Press
Preset FACTORY: PRESET
9. Press
SERVICE MENU
System
10.For the location of the blanking adjustment, refer to
value indicated on the analyzer display.
3-30
8719ET/ES
8720ET/ES
436A, 437B, 438A, E4418A (EPM-441A) or
E4419A (EPM-442A)
8485A
part number 85052-60012
(part of 85052B)
N/A
part number 8830-0024
Preset Sweep Setup
TESTS 54
x1
Figure
8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers
8722ET/ES
8487A
N/A
part number 85056-60006
(part of 85056A)
CW FREQ 50.5
.
EXECUTE TEST
3-6. Adjust it to obtain the
Service Guide
.
M/µ