Philips SCOPEMETER PM93 Service Manual page 90

PERFORMANCE VERIFICATION PROCEDURE
3. Trigger level control range channel A and B
*** All models ***
This test checks the trigger level control range.
Test equipment:
Tektronix SG 503 Constant Amplitude Sine wave Generator
Test setup:
Connect the banana jack COM to the BNC common
Tektronix
SG 503
Settings/procedure/requirements:
0 0 0 0 0
OCJCJO
0 0 0 0 0
O D D
DDBDD
0 0 0 0 0
o
000
ScopeMeter
Sr'6035
4 - 19
A Apply a 500 kHz sine wave with an amplitude of 950 mV peak-to-peak to channel A. Use a 50n
termination.
B Switch on the ScopeMeter and press the SCOPE key to get into SCOPE mode. Now press the
AUTO SET key.
C Verify that the signal is well triggered.
D Set channel A to 100 mV/div.
E
F
Press the TRIGGER key. Use the select/adjust keys to verify that the trigger level range is more
than 8 divisions (4 divisions up and 4 divisions down). The selected trigger level is shown on the
display (reversed indication "~ LEVEL"). Also the trigger level indication, marked with an A
I
will shift, while shifting the trigger level. See figure 4.9.
Repeat the same procedure for channel B.
I
~
II I \
I
\
1\
V
\
aJ
\
J
\
I
\
\
I
\
jA
,
I
\
r
I 1 I
1
\ I
\
II
\ I
\
ST5988
Figure 4.9 Trigger level indication on screen