HOW TO USE THE INSTRUMENT

4 - 65

DELAYED TIMEBASE

TRACE SEP

The traces displayed by the Main Timebase and Delayed Timebase can be

separated with TRACE SEP.

 

If the DELAYED TIMEBASE menu is activated, you will see the

T symbol next

to the TRACE SEP text. The T indicates that the TRACK control can be used to adjust the trace separation.

-Turn the TRACK control and observe that the DTB trace shifts.

dtb

TRACK

 

ST6728

 

 

DELAYED TIMEBASE

TRIGGER

 

 

Using the Delayed Timebase (Del’d) to select, capture, and display a small portion of the Main Timebase display results in a magnification of the intensified part. Depending on the ratio between the MainTB and Del’dTB settings, this magnification can be very significant.

If the input signal contains jitter or any other form of timing instability, this jitter will be magnified in the same ratio. This can be so much, that the display becomes unusable. To address such a problem, the Delayed Timebase (Del’dTB) can be made to trigger on the input signal after the delay time has passed.

Start with the STANDARD SETUP.

-Connect the Probe Adjust signal to the Channel 1 input.

-Simultaneously press the STATUS and TEXT OFF keys.

-Switch channel 1 to AC coupling ().

-Shift the trace to the upper half of the screen.

-Press the Delayed Timebase (DTB) key to enter the DELAYED TIMEBASE menu.

-Turn on the Delayed Timebase.

 

 

DELAYED

 

 

TIME BASE

 

 

DEL'D TB

 

 

on off

 

 

MAIN TB

1-

 

on off

 

starts

 

 

 

 

trig'd

 

 

TRACE

 

 

SEP

T

 

 

LEVEL

 

 

+0V

Δ

 

 

ac dc

 

 

lf-rej

 

 

 

hf-rej

 

500mV

MTB 1ms

ch1

CH1

DTB 0.1ms >4.300ms ch1

 

 

 

ST6717

Page 110
Image 110
Fluke PM3370B user manual Delayed Timebase Trace SEP, Delayed Timebase Trigger, Start with the Standard Setup