Tektronix 549 Instruction Manual page 7

B Time Base2
Source Coupling
NORM Minimum 0.2 cm of deflection, DC
DC
(internal) to 1 M Hz, increasing to 1 cm at 10
M Hz.
Same amplitude as DC, 300 H z to
AC
10 M Hz.
AC LF REJ Same amplitude as DC, 200 kH z to
10 M Hz.
Triggering
PLUG -IN
unit performance.
(internal)
Minimum 0.3 volt signal, DC to 1
EXT DC
M Hz, increasing to 1.5 V at 10 M Hz.
AC Same amplitude as DC, 300 H z to
10 M Hz.
AC LF REJ Same as DC, 200 kH z to 10 M Hz.
Automatic Mode: Time Base A and Time Base B3
Source
NORM (internal) Minimum 0.2 cm of deflection, 50
H z to 10 kHz, increasing to 2 cm at
1 M Hz.
EXT Minimum 0.3 volt signal, 50 H z to
10 kHz, increasing to 3 V at 1 M Hz.
External Trigger Input characteristics:
Time Base A 1 megohm paralleled with 25 pF
except the AC
which is approximately 91 kilohms.
3 U p p e r a n d lo w e r fre q u e n c y trig g e rin g re q u ire m e n ts a re sh o w n in
F ig . 1 - 3 .
3 The A u to m a tic M od e trig g e rin g
1-3 a r e a p p lic a b le o n ly w h e n u sin g A C c o u p lin g .
®I
Condition
dependent on plug-in
Condition
'
LF REJ coupling
fe a tu re s sh o w n in F ig . 1 -2 an d
Time Base B 1 megohm paralleled with 40 pF,
except the AC
which is approximately 91 kilohms.
Maximum Exter- 50 volts, combined DC and AC
nal Input Voltage peak.
PO W ER SUPPLY REQ UIREM EN TS
A N D FEA TURES
Trans Pri Sel A switch selects the center voltage
of two operating ranges: 94 to 138
VAC or 187 to 279 VAC.
LIN E RANG E Selector LO W : 104
VAC ± 1 0 % .
MED:
VAC ± 1 0 % .
HIG H : 127 VAC
VAC ± 1 0 % .
Line Voltage Frequency 50 to 60 Hz.
Input Power (Maximum) 750 volt amperes, 650 watts.
Thermal Protection Automatic resetting thermal cutout
which interrupts instrument power
if internal temperature exceeds a
safe operating level.
MECHANICAL FEA TURES
Construction Aluminum alloy chassis. Anodized
front panel. Blue vinyl coated cabi­
net.
Overall Dimensions 13 inches wide, 24 inches long and
17 inches high.
Standard accessories supplied with the instrument w ill be
found on the last pull-out page at the back of the manual.
For optional accessories see Tektronix, Inc. catalog.
Characteristics— Type 549
LF REJ coupling
VAC ± 1 0 % or 208
115 VAC ± 1 0 % or 230
± 1 0 % or 254
1-3