Step 2. Operator's Check; Description - Agilent Technologies 8719ET Service Manual

8719ET/20ET/22ET
8719ES/20ES/22ES
RF Network Analyzers

Step 2. Operator's Check

Description

The operator's check consists of two softkey initiated tests: Op Ck Port 1 (Test 21) and
Op Ck Port 2 (Test 22).
On the ES models, a short is connected to PORT 1 and PORT 2 to reflect all the source
energy back into the analyzer for an S11 and S22 measurement. To achieve full reflection
for ET models, a short is connected to the REFLECTION port. An RF cable is connected
between the REFLECTION and TRANSMISSION ports for Op Ck Port 2.
On ES models, the first part of Op Ck Port 1 checks the repeatability of the transfer
switch. An S11 measurement is stored in memory and the switch is toggled to PORT 2 and
then back to PORT 1 where another S11 measurement is made. The difference between
the memory trace and the second trace is switch repeatability.
The remaining parts of both tests exercise the internal attenuator in 5 dB steps over a
55 dB range. For ET models, without Option 004, a single measurement is made.
The resulting measurements must fall within a limit testing window to pass the test. The
window size is based on both source and receiver specifications.
The operator's check determines that:
1. The source is phase-locked across the entire frequency range.
2. All three samplers are functioning properly.
3. The transfer switch is operational (ES models only).
4. The attenuator steps 5 dB at a time (ES and ET Option 004 models only).
5. A rough check of the receiver's linearity.
Table 4-1 Required Accessories
Type of Device
Short 3.5 mm (f)
(8719ET/ES and 8720ET/ES)
Short 2.4 mm (f)
(8722ET/ES)
Cable 3.5 mm
(8719ET and 8720ET)
Cable 2.4 mm (f)
(8722ET)
Service Guide
HP/Agilent Part Number
85052-60007 (part of calibration kit 85052B)
85056-60021 (part of calibration kit 85056A)
85131F
85133F
Start Troubleshooting Here
Step 2. Operator's Check
4- 7