Manual - 8500A Series Peak Power Meter - Giga-tronics

Series 8500A Peak Power Meters
5.2.6 Delay Accuracy Test
Be sure that a Pulse Generator with at least 10 ppm frequency accuracy is used for this test.
Pulse Generator
Signal Generator
Series 8500A
Modulation
Trigger
Input
RF Out
Peak Power
Sensor
Figure 5-2. Delay Accuracy Test Setup
1. Set the peak average value to 20 by pressing [MENU] (2) [F2] [20] [UNITS]. Set the internal
delay for 75 µs by pressing [MENU] (9) [F2] [75] [µs].
2. Set the Pulse Generator to generate a 10 µs wide pulse with a repetition rate of exactly 10 kHz.
Adjust the amplitude to 5 V. Connect the Pulse Generator to the RF source (Signal Generator) as
shown in Figure 5-2. Set the Source to generate a 50 µs pulse when triggered by the Pulse
Generator. Adjust the amplitude of the Source to 0 dBm or greater. The frequency of the Source
is not important. Any Source operating within the range of the PPM will be satisfactory if it can
be modulated with an external pulse signal and has a rise time less than about 30 ns.
3. Set the PPM to read in the Graph Mode by pressing [GRAPH]. Press [GRAPH] again to cause
the autoscale function to be performed after the PPM has been connected to the Pulse Generator.
A graph of the pulse profile should now be displayed.
4. Select a delay window of 0.2 µs and set the cursor delay to place the cursor at the 50% point on
the rising edge of the pulse. Note the Cursor Delay Value.
5. Press [MENU] (4) [F1]. Set the Reference Delay to be the value read at the 50% point of the
first pulse (causing the cursor delay to be zero).
6. Set the start delay to 99.90 µs. Set the cursor delay to place the cursor on the 50% point of the
rising edge of the pulse. The cursor delay should read 100.00 µs ±0.01 µs.
5-6 Manual No. 20790, Rev C, November 1998
Superceded by Revision D, March 2009