Philips PM3055 Operation Manual page 32

3-18E
3.4.3
Brief checking of controls and functions.
Step sequence Controls
Requirements
STEP 2.0 DC input coupling
SE cew
CW
STEP 2.1 AC input coupling
— VAR Aor B:
ccw
STEP 2.3. Chopped display
SERS enEee
Sais
CP le
fhe eee
|_|} fp
RRR ESRERE,
Rae See
— Y POS Aor B:
— YPOSAorB:
— Square-wave of 6 div.p-p (compensate
both probes)
— Check that the signals shift
downwards.
— Check that the signals shift
upwards.
— Check that the signals shift downwards
since the attenuator inputs are AC—
coupled.
— Check that the amplitude
decreases.
— Check that the signals are displayed
alternately.
— Check that the signals are displayed
simultaneously,
giles occ
preoenns
ecto
4