Telequipment DM64, Manual

Page: 11 / 63

~
,
,
,
I
I
I
SAWTOOTH
ill
4. Set TIME/DIV to 1 ms.
5. Connect probe tip to the GATE
OUT.
6. Adjust the probe trimmer for a
square corner on the leading edge
of the display as follows:
In the HZ1 B probe, a screwdriver
adjustment is provided through a hole
in the probe body.
The GE81 000 is calibrated as follows:
1. Slacken the narrower of the two
knurled rings at the BNC connec-
tor end of the probe cable.
2. Rotate the adjacent broader ring
until a square corner is obtained.
3. Tighten the narrow ring without
disturbing the broad ring.
If a 1kHz squarewave is used, the
amplitude should be about 500 mV
and a few cycles of the waveform
should be displayed. The above
calibration procedure should be
followed with X10 probe tip applied
to the squarewave generator output.
The compensation should be checked
if the probe is transferred to INPUT 2.
provides a positive-going ramp wave-
form when the sweep is running. A
recurring sawtooth is produced when
the STABI L1TY is fully clockwise for
the sweep generator to free-run. The
resistance of an applied load should
exceed 47 k,Q to avoid loading the
sweep generator.
th is is connected to the chassis of the
instrument.
2.2.1 Before connecting the instrument to the supply, check
that the rear voltage-selector plug is indicating the local
supply voltage or the nearest value to it. Check also that the
fuse fitted is 1 A for 100-125 V operation or 500 mA for
200-250 V.
NOTE:-
The 3-core supply lead is alternatively colour coded
as follows:
Brown
Black
Earth
(Chassis)
Green/Yellow
Green
Blue
White
1. CRT
BRILLIANCE
FOCUS
ASTIG
STORAGE
TRACE ROTATION
Mid Position
Central
Fully anti-clockwise
Off
As set
2. HORIZONTAL DISPLAY
POSI TI ON Central
FINE Central and pushed in
3. SWEEP
STABILITY
TIME/DIV
VARIABLE
LEVEL
TRIG MODE
SINGLE SHOT
Fully clockwise
5 ms
Fully clockwise
Any position
A 11buttons out
REP.
4. VERTICAL DISPLAY CH1 & CH2
OFF-ON ON
INT TRIG 1
CHOP AL T-SUM CHOP
POSITION Central
INVERT-NORMAL NORMAL
VOL TS/DIV 0.2 V
VARIABLE Fully clockwise
DC-GND-AC GND
1. Plug into the supply and switch on by the ASTIG. LUM.
2. Allow a few minutes for warm up then adjust CRT and
POSITION controls for a two-trace display.
3. Adjust TRACE ROTATION if necessary to make the
traces horizontal.
4. Apply the supply frequency squarewave from the CAL
500 mV peak to peak socket to both I NPUT connectors
via co axial leads and switch both DC-GND AC to DC.
5. Rotate STABILITY anti-clockwise to lock display.
6. If the supply frequency is 50 Hz, 2.5 cycles of the
calibrator waveform will be displayed. each display being
2.5 div in amplitude.