Test Products International 460 - Manual (Page 21)

Chapter 4
Advanced Functions
This chapter assumes the user has now become proficient with the general use of the tpi Scope
Plus 460, and is ready to utilize the more enhanced operations of the 460’s built-in oscilloscopes
and related logic circuits.
In this chapter we will look at triggering, trend mode and different aspects of capturing glitches.
We will also look at screen saves, use of the 10:1 probe and probe adjustments.
Triggering
Trigger level refers to the control of the threshold voltage amplitude level that is triggered from
the input signal, in turn synchronizing the waveform. Once the voltage exceeds or recedes the
trigger level, the meter will draw a trace of the signal with greater stability allowing the technician
to analyze the portion of interest more efficiently.
With Channel A on the 460 active, connect the Common and Probe Lead A to a signal source
(Sine Wave preferred), and proceed with the following steps:
1. Click SCOPE, then select A=ACU, Mode=Auto, B=Off. Then select ENTER
2. Move the highlight to TRIGGER and press ENTER
3. Use the mV / V Channel A rocker key to size the waveform.
4. With the highlight on TRIG. LEVEL, use the up and down keys to stabilize the waveform.
5. Observe that you have now stabilized the waveform without changing the frequency and
without intentionally freezing the waveform. So this is a stabilized live waveform suitable
for analysis or monitoring.
6 Use the SOURCE or TRIG. SLOPE highlight options in conjunction with the direction
buttons to modify the waveform.
7. Use the EXIT box (F1) to Exit from the trigger operation and / or to move the
waveform position on the screen.
Trend Mode
The Trend mode graphs signals over time to capture problems. This option has menu
boxes but is inactive on the current model of the 460.
460 User s Guide Advanced Functions
C4-1