Philips SCOPEMETER PM93 Service Manual page 96

PERFORMANCE VERIFICATION PROCEDURE 4 - 25
Settings/procedure/requirements:
Square wave
A Switch on the ScopeMeter and press the SCOPE key to get into scope mode.
B Press the SPECIAL FUNCT key. Now press the left most soft key, marked GENERATE. This will
reveal the GENERATE pop- up menu.
C Use the select/adjust keys to select "Square: 976 Hz" and press the right most ENTER soft key
to activate the generator.
D Press the LCD key, and then press the softkey PROBE CAL. This will reveal the CAL&ADJUST
pop-up menu. Use the select/adjust keys to select "Channel A 1: 1" and press the ENTER soft key
to activate 1: 1 coupling.
E Now press AUTO SET.
F Press the CURSOR DATA key. This will get you to the CURSOR DATA menu.
G Press the CURSOR softkey. Use the <-CURSOR 1-> key to position the left cursor line on the
most negative part of the square wave signal. Use the <-CURSOR 2-> key to position the right
cursor line on the top of the square wave signal.
H Now press the FUNCTION softkey. This will reveal the FUNCTION pop-up menu. Use the
select/adjust keys to select "FREQUENCY" and press the ENTER softkey to activate the
frequency measurement. Press the FUNCTION soft key again. This will remove the FUNCTION
pop-up menu.
The ScopeMeter display will look like figure 4.12. The generator must produce a square wave
signal with an amplitude of 5V and a frequency of 976 Hz (typical values).
A 2V AC
500llS/DIV
- - 1 -
B 2V OFF PROBE 10: 1
TRIG: AS
A
dV:
5.00
V
dt:
2.64
ms
FREQ:
976
Hz
CURSOfll DATA
FUNCTION MARK on A
IN.';U!t·,.
~ [1I1Ij~1.';1
NONE
~
f1 %
ST6178
Figure 4. 12 Generator produces square wave signal
Sine wave
J Now press the SPECIAL FUNCT key. Press the GENERATE soft key to reveal the GENERATE
pop-up menu. Use the select/adjust keys to select "SINEWAVE" and press the ENTER softkey
to activate the generator.
K Use the mVN keys to adjust the attenuator.