B-Time Base Adjustment; R4840: X-Magnification X10 - Hameg HM1004 Service Manual

Move trace with X-Pos. control so that the first time mark coincides with the first left graticule
line of the screen.
Rotate VAR. 2.5:1 (TIME/DIV) (24) until the 11th time mark coincides with the last right
graticule line. If only 10 time marks are visible, set the 10th time mark on the last but one
(next to the last) right graticule line.
Save the time base adjustment by pressig the SAVE pushbutton.
Set time mark generator to 10 MHz and time base to 0.1µs/div.
Rotate VAR. 2.5:1 (TIME/DIV) (24) until the 11th time mark coincides with the last right graticule
line. If only 10 time marks are visible, set the 10th time mark on the last but one (next to
the last) right graticule line.
Save the time base adjustment by pressig the SAVE pushbutton.
Operate for each time base setting in the same way until 500ms/div.
Set time base from 500ms/div to 0.05µs/div.
Set time mark generator to 20 MHz (0.05µs/period) and connect the signal to CH I input.
Set input attenuator CH I to a suitable setting for a signal display of approx. 4 divisions height.
Press both NORM pushbuttons briefly for normal triggering mode.
Turn TRIG. LEVEL knob for exact triggering.
Set time base to 0.05µs/div.
Move trace with X-Pos. control so that the first time mark coincides with the first left
graticule line of the screen.
Rotate time base variable control to fully left position.
Now more than 2.5 time marks per division must be displayed.
Check all TIME/DIV. settings with suitable signals in the same way.

25) B-Time Base Adjustment.

Set time mark generator to 20 MHz (0.05µs/period) and connect the signal to CH I input.
Set input attenuator CH I to a suitable setting for a signal display of approx. 4 divisions height.
Press both NORM pushbuttons briefly for normal triggering mode.
Turn TRIG. LEVEL knob for exact triggering.
Set A-time base to 5µs/div.
Press A/ALT/B pushbutton two times.
Set B-time base to 50ns.
Move trace with X-Pos. control so that the first time mark coincides with the first left graticule line
of the screen.
Rotate VAR. 2.5:1 (TIME/DIV) (24) until the 11th time mark coincides with the last right graticule
line. If only 10 time marks are visible, set the 10th time mark on the last but one (next to the last)
right graticule line.
Save the time base adjustment by pressig the SAVE pushbutton.
Set time mark generator to 10 MHz and time base to 0.1µs/div.
Rotate VAR. 2.5:1 (TIME/DIV) (24) until the 11th time mark coincides with the last right
graticule line. If only 10 time marks are visible, set the 10th time mark on the last but one
(next to the last) right graticule line.
Save the time base adjustment by pressig the SAVE pushbutton.
Adjust B-time base up to 5µs/div the same way.
Press A/ALT/B pushbutton once.
Set A-time base to 1ms/div.
Press A/ALT/B pushbutton two times.
Set B-time base to 10µs/div.
Set time mark generator to 100KHz.
Rotate VAR. 2.5:1 (TIME/DIV) (24) until the 11th time mark coincides with the last right
graticule line. If only 10 time marks are visible, set the 10th time mark on the last but one
(next to the last) right graticule line.
Operate for each time base setting in the same way until 20ms/div.

26) R4840: X-Magnification x10.

Locate and identify R4840 (26) on MB-Board.
Press pushbutton X-Mag. x10 (x10 LED lit).
Set time base to 1µs/div. Set time mark generator to 10 MHz and connect signal to channel I input.
Set input attenuator CH I to a suitable setting for a signal display of approx. 4 divisions height.
Set X-POS control to mechanical center.
Using X-POS control, move the first visible time mark to the first left graticule line.
Adjust R4840 (28) so that the next time mark coincides with the last (right) graticule line.
Press RECALL pushbutton to exit SWEEP-GENERATOR adjust.
Subject to change without notice 53