Operation
Manual 21568, Rev. F, March 2008
2.3.10
Measuring Rise-Time
Rise time measurements can be performed using a technique similar to the pulse width
measurement. This example uses a linear Watts display readout rather than the more common
logarithmic dBm readout for convenient identification of the 10% and 90% levels.
1.
Preset the delay offset to 0 ns.
2.
Press [dBm/mW] to obtain a linear, Watt, display readout.
3.
Set the sample delay equal to about half the pulse width.
4.
Press [REL] to set the 100% reference level.
5.
Set the sample delay to a position on the rising edge of the pulse. Increment or decrement the
sample delay value until the power level display reads approximately 10%.
6.
Remember or write down the sample delay value.
7.
Press [MENU]. Select SETUP MENU then PEAK SNSR SETUP. Proceed to the SAMPLE
DELAY OFFSET selection. Set the offset value to the same value from Step 6.
8.
Return to the measurement display and increment the sample delay until the display reads
approximately 90%.
The sample delay currently displayed is the 10% to 90% rise time.
2.4
GPIB Commands
These commands supplement the commands given in the Series 8540C Universal Power
Meter Operation and Maintenance Manual.
2.4.1
Setting Trigger Modes
These commands set the trigger method for the 8035XA sensor. The sensor can be set to
trigger on the rising RF envelope of the power signal. This is the internal trigger mode. An
external TTL trigger can be used, or the sensor can “free run” and allow a CW measurement
mode with no trigger required.
The terms digital filter (as used in some instrument instructions) and averaging buffer (as used
here) are interchangeable.
Examples:
OUTPUT 713;PEAK A INT TRIG -10.00
! Configure sensor A for internal trigger at
! -10.00 dBm trigger level
OUTPUT 713;PEAK B EXT TRIG 1.50
! Configure sensor B for external trigger at
! 1.50 Vdc trigger level
OUTPUT 713;PEAK A CW
! Configure sensor A for CW measurements
In this example, the address 713 means "Type 7" GPIB instrument, and address 13 for the
power meter. The GPIB control command (the portion to the left of the semicolon) may vary.
Trigger Modes With a Peak Sensor
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