3 - 4
BRIEF CHECKING PROCEDURE
Repeatedly pressing the TEXT OFF key allows you to select the amount of
information on the display.
3.3
Vertical section
The vertical section consists of four channels CH1, CH2, CH3 and CH4. The
vertical section in PM3370B/80B/90B consists of two channels CH1 and CH2 that
must be checked. These are almost identical. The procedure is described for
CH1. Steps for CH2, CH3 and CH4 are shown in parenthesies. To check all four
or two channels, the procedure must be done four or two times. For PM3370A/
80A/90A this section includes a separate check of the EXT TRIG input and TRIG
VIEW function.
Differences in the keys for AC/DC input coupling, grounded trace (GND) and 50
Ω
input impedance may exist. This is indicated in the text. These test steps may be
skipped.
Proceed as follows:
Preparation:
-
Connect a probe to the CH1 (CH2, CH3, CH4) input.
-
Connect the probe tip to the Probe Adjust output socket.
-
Press the AUTOSET key.
Figure 3.2
CRT viewing area, softkeys, menu keys, and symbols used in this
chapter.
CURSOR READ OUT
SETTINGS READ OUT
CURSOR MENU HEADER
SOFTKEYS
SYMBOLS:
:INVERT ON
:DC COUPLED INPUT
:AC COUPLED INPUT
:GROUNDED INPUT
↓
=
ST6648
9312
:POS TRIGGER SLOPE
:NEG TRIGGER SLOPE
CURSORS DTB
DISPLAY
TB MODE TRIGGER
....
:DUAL SLOPE (DIGITAL MODE)