Figure 9-11 . Def1 Synchronization; Analog Zero-Span Problems (8560E) - HP 8560E Service Manual

Controller Section
Analog Zero-Span Problems (8560E only)
Analog Zero-Span Problems (8560E only)
1. On the HP 8560E, press
2. Set an oscilloscope to the following settings:
3. Externally trigger the oscilloscope off the signal at A2U207 pin 8
4. The display should be similar to
5. The sweep input from J1-41 should go from 0 V to +10 V; the video In
6. In
Figure 9-11 DEF1 Synchronization
486
, , and
CAL MORE CRT ADJ PATTERN
Amplitude scale ......................................................... 10 V/div
Sweep time ............................................................... 1 ms/div
Triggering ................................................................. External
(LBRIGHT).
the untriggered trace should show at the left edge of the screen. In
these settings, DEF1 causes switching between the line generators
and the analog inputs (sweep and video). DEF1 remains high when
the CRT adjust pattern is on. Refer to function block M of the A2
controller schematic, 1 of 4.
signal should go from about 0 V to 1 V from the bottom to the top of
the screen. Apply a dc voltage to A2J4, Video In, to test the circuit.
Figure 9-11 on page
DEF1 and the video patterns X POS and Y POS when DEF1 is TTL
high. The Y POS level when DEF1 is low is the Video In level.
, ,
PRESET SPAN ZERO SPAN
.
Figure 9-11 on page 486
486, there is no synchronization between
, , 1, ,
SWEEP ms
except that
Chapter 9