Instrument Options—455/A2/B2
VOLTAGE CONDITIONS
•
Voltages shown on this schematic diagram were measured with a Tektronix DM 501 Digital Multimeter. Voltage measurements can vary as
|nuch as ±20%.
The B2 A COUPLING switch was set in the FIE LD position.
WAVEFORM CONDITIONS
Waveforms below were taken from a Tektronix 7000-series oscilloscope equipped with readout, 7B series time-base, 7A13 Differential
Comparator and a 10X probe. The offset voltages were read directly from the 7A13 in the dc coupled mode. If a different test oscillo
scope system is used, the ac coupled mode may have to be used due to high dc offset voltages. This can cause some waveforms to appear
slightly different. Waveforms may vary as much as ±20%.
The 455 was powered from a 24 V dc source. The INTENSITY control was set for normal trace brightness or about midrange.
The test oscilloscope was externally triggered using the waveform at the collector of Q662.
0
____________
0
0
500 mV
1 ms
jM
*
4
m
i
i
• *
Ml
i
-
L
IT
2 V
J_ 1
ms
1 .
-
\
“
1
1
!
I
u jr -
0
1 V 1 ms
!...
.....
u
j
J_
J_
1
GATE
I
-----------------------------
TRANSISTORS----------------------------1 I-----------------------------1
SILICON CONTROLLED
RECTIFIER
1907-4
REV. C, APR. 1977
Option 7 Page 7
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