Philips SCOPEMETER PM93 Service Manual page 91

4 - 20 PERFORMANCE VERIFICATION PROCEDURE
4. Power supply voltage range
*** All models ***
This test checks the correct operation of the ScopeMeter within the boundaries of the DC supply
voltage.
Test equipment:
Philips PE 1537 Power Supply 0-40V/0-1A
Tektronix SG 503 Constant Amplitude Sine Wave Generator
5 mm Power Jack connector plug with attached cable (for example order 4822 321 20125)
Test set-up:
Tektronix
SG 503
Settings/procedure:
DDDDD
Dc:::::Jc:::::JD
DDDDD
D D D
DDBDD
DDDDD
D DDD
ScopeMeter
Power
Connector
Plug
PHILIPS PE1537
Power Supply
A Insert the power plug into the power adapter contact on the side of the ScopeMeter.
B Switch on the power supply and set the voltage to a wanted value between 8 and 20V DC.
C Apply a 50 kHz sine wave with an amplitude of 100 mV peak-to- peak to channel A. Use a 50n
termination.
D Switch on the ScopeMeter. At power on, a beep tone must be audible.
E Press AUTO SET and verify that a well triggered signal with an amplitude of approximately 5
divisions is displayed over the whole supply voltage range.
Requirements:
A The ScopeMeter must start at any DC voltage between 8 and 20V, applied at its power adapter
contact.
B The ScopeMeter must remain operative over the indicated voltage range.
C The amplitude of the trace displayed must be approximately 5 divisions, independent of the
supply voltage.
5T6001
Figure 4. 10 Power Jack connector