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VISION
17-9-1970
GENERAL
Cd 667
TEST AND
MEASURING
INSTRUMENTS
RE: TEST INSTRUMENTS
FOR OSCILLOSCOPES
The importance of using appropriate test and calibrating instruments for pre-sale testing and ser-
vicing of equipment is now generally recognised. After careful study, in co-operation with develop-
ment and quality-control specialists, we compiled a recommanded list especially for oscilloscopes.
Depending on the local needs and availabilities, we advise the National Service Organizations to
consider investing in the following test instruments.
A. REAL-TIME
OSCILLOSCOPES
a. Calibrating deflection factors and sweep speeds
b. Checking the square-wave response of probes and attenuators
For a) and b) use Oscilloscope Calibrator, type 156, by G & E Bradley Ltd, Electrical House,
Neasden Lane,
London NW10,
England.
c. Checking bandwidth™)
For the new procedure, applicable to PM 3200, PM 3210, PM 3220/21, PM 3230, PM 3231, PM 3250
and future oscilloscopes or units up to 199 MHz bandwidth,
a constant amplitude generator,
a 50 2
cable and a 50 2 termination pad, ordering code PM 9585 (i.e. type XE 101 96) are required.
The advised generator is Tektronix type 191.
In general, an oscilloscope may be rejected when the sum of the tolerances of the oscilloscope un-
der test and the measuring instrument are exceeded.
d. Checking rise times®)
For this check we recommend
square-wave generator Tektronix type 284. As under c) the generator
should be connected via a 50 2 cable, terminated by a 50 2 pad. The rise time of the generator
should be taken into account and preferably be checked with a sampling oscilloscope,
e.g.
PHILIPS
PM 3400,
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