Introduction to 85108A
Pulsed Network Analyzers
Pengcheng Jia
Dec 13, 2001
Outline
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What is measurement?
What is 85108 Pulsed Network Analyzer?
What are the Connectors & Cables?
What are the Calibration Kits?
What is Non-Insertable Calibration?
How to do Pulsed Measurement?
How to Control by Computer?
What is measurement
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Define Measurement:
f, P, T, expected values and tolerance.
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Define System Configuration
Configure Hardware:
User setting, Gauging, Always use ESD Protection
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Check Hardware: DUT, Cables, Connectors
Calibrate
Verify
Measure
Analyze and Archive
Measure S Parameters
85108A System Configuration
System Cabling Diagram
LO source: 10M-20 G
RF source: 10M-50 G
Test Set:
Test Set works from 1-50 GHz in 2 Bands:
1-20 GHz Use directly LO source.
6-50 GHz Use third harmonic of LO source.
1-50 GHz
85110A Test Set Signal Flow
Simplified NA - 8722D
•50 MHz to 40 GHz
•100 dB of dynamic range
•Excellent measurement accuracy
•Two measurement channels
•Four display channels
Difference: 85108A—8722D
Freq Range
8722D
50M-40G
85108A
1-20G,6-50G
Accuracy
N/A
0.01dB
Pulsed RF
N
Pulse Profile (Time Domain) N
Sweep Mode
Ramp Mode
IF Bandwidth
3KHz
Y
Y
Step Mode
1.5MHz, 10KHz
High Power Meas.
Y
N
Avoid Large Time Delay of DUT
Frequency Sweep
Step Mode: 85108A
f
t
200 ms
Ramp Mode: 8722D f
t
DUT
=10 ns
Original
3KHz BW
Ramped
8722D with 3K IF BW
4KHz
f
Pulse Meas.- Freq Domain
Point-in-Pulse
•Freq Domain Meas.
•Use 1.5M Broadband IF
filter (Normal meas. use
10K IF filter)
•Adjustable Duty Cycle
Default: 10%
•Adjustable Pulse Width
Default: 10 ms, min 1us
•Trigger time: 5ms from 0
Pulse Meas.-Time Domain
•Display Time
Domain Pulse Profile
•Choose Pulse Profile
in Domain menu
•Measure only at a
single frequency
High Power Meas.
+43 dBm
+17 dBm
+43 dBm
+17 dBm
Never Exceed the Power Limitation on the Test Port
Port1 & Port2: +43 dBm
RF Input Port: +17 dBm
Connectors for NA
Connector Dielectric Freq
Mate
with
Wrench
Note
SMA
Yes
18G
3.5, 2.9
5lb.in
Not recommend to
mate with 3.5, 2.9
3.5
No
26.5G SMA,2.9 8lb.in
HP PSC connector
2.9(K)
No
40G
SMA,3.5 8lb.in
HP PSC, Wiltron K
2.4
No
50G
1.85
HP PSC
1.85(V)
Yes
65G
2.4
8lb.in
PSC: Precision Slotless Connector
HP PSC, Wiltron V
Cables for NA
•Cables (only following cables can be used for NA):
Semi-Rigid with K connectors
Flexible—Thin Jacket with K connectors (Blue, from Gore)
Flexible—Thick Jacket with 2.4 mm connectors (Black,
from Agilent)
• Connectors on Port 1 & 2 is 2.4 mm
• 2.4 to 2.9 (K) adaptors are put to mate with K
connector cables, Never Remove Them
• Always Keep Connects & Adaptors Clean
• Treat Them Gentle and Put Back to Box
Cautions:
• Select Correct Cal Kit and Load Calibration
Constants before Calibration
• Never Remove a Calibration Standard from
the Box or Use for Any Purpose Other Than
Calibration
• Never Drop the Standards to Ground
• Always Use Special Wrench Correctly
• Put the Cal Kits Back to Cabinet after Use
• Report Any Discrepancy
Load Configuration Disk
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Load the Test Set Configuration Disk for 85110A
with H60/61 option
(Disks are stored in Drawers, never remove them)
Disk->Storage is Internal
Load->More->Machine Dump
MD_1_20_NP, 1-20 GHz, Non-Pulsed
MD_1_20_PL, 1-20 GHz, Pulsed
MD_6_50_NP, 6-50 GHz, Non-Pulsed
MD_6_50_NP, 6-50 GHz, Pulsed
Calibration Procedure
• Press Cal menu
• Choose Calibration Kit, if not installed in equipment,
load the cal constant from disk
• Choose in the Calibration Menu
LRM for on-wafer Calibration, Full 2-port for cable
calibration
• Follow instruction, connect standards and measure
• Save calibration data
• You will see “Correction On”
Error Model for Full 2-Port Cal
Calibration Non-Insertable DUT
Swap Equal Adaptors
Swap Equal BetweenSeries Adaptors
Swap Equal In-Family
Adaptors
Adaptor Removal
• Calibration with adaptor on
Port 2, save as Cal Set 1
• Calibration with adaptor on
Port 1, save as Cal Set 1
• Modify Cal Set->Adaptor
Removal
•Refer the additional document for more details
•More calibration methods are included in that file
Calibration with On-Wafer Kit
• Use WinCal on Controller-Dizzy
• Calibration Constant is set in program
• Choose LRM, since short is not good
• LRRM is recommended for more accuracy
How to do Pulsed Meas.(1)
Frequency Domain (Point-in-Pulse)
• Domain->Frequency
• System->More->Pulse Config->Detector:
Wide BW
• Select Maximum Points
• Calibration
• System->More-> Pulse Config-> High or Low
• Set Pulse Width, Duty Cycle
• Stimulus->More->Trigger Mode->Trigger Delay
• Measure
How to do Pulsed Meas.(2)
Pulse Profile Domain - Single Frequency
• Domain->Frequency
• Stimulus->Step mode & Start->Set desired frequency
• Domain->Pulse Profile
• Select Maximum Points
• Calibration
• Measure
• Repeat for Next Frequency
How to do Pulsed Meas.(3)
Pulse Profile Domain – Frequency List
• Cal->Correction off
• Domain->Frequency
• System->More->Pulse Config->Detector: Wide BW
• Stimulus->More->Edit List
• Add->Start->3 G/n, Number of Points->51x1->Done
• Add->Start->4 G/n x1->Done
• Add->Start->5 G/n x1->Done
• Done Frequency List, and Proceed with Calibration
How to do Pulsed Meas.(4)
Using Frequency List – Continue:
•When begin to Measure:
Domain-> Pulse Profile
Stimulus->Frequency List->Single Segement
The last selected segment will be active and ready for
measurement
Calibration will be effective for each frequency point
• Set Pulse Polarity, Pulse Width and Duty cycle if needed
Computer Control
• 2 GPIB Connectors are on the back of 8510C
1 for 85108 System bus (don’t touch)
1 for computer controller (already connected)
• Dizzy is the controller
• Use WinCal for On-Wafer Calibration and SParameter Measurement
Choose the correct VNA first
Config->Option->VNA->8510 or 8722
• Use Labview Program for 85108 configuration