Tektronix 2A63 Product guide

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INSTRUMENT REFERENCE BOOK
for the Tektronix Type
2A63
differential amplifier unit
For all serial numbers
• TEK 2A63 IRB 1-25-64 1

2
©, 1964, Tektronix, Jnc., P. 0. Box 500
Beaverton, Oregon. All ri,:htr, rG§Cfvcd,
1-25-64 TEK 2A63 !RB

MPI EXTRACT
MPIMay 1964
2A63 (also see Interim IRB)
~C Stabilized neon, insufficient sustaining voltage
Accessories included
* Calibration procedure
Compatibility with 560 Series
*Demo tips
*Designation change
*Instruction Manual
*Q454 and Q464 sockets must be rewired to accommodate
new transistors
Test specifications
*Tube 157-066 suitable for 63 (see 503 story)
*Tubes, use 157-066 6DJ8 1s for easier balancing
*!nduded within IRB.
TEK 2A63 IRB 9-25-64
FEN 8-10-62
061-499
061-209
FEN 5-11-62
FEN 6-16-61
SPR-131 8-15-62
070-266
FEN 9-29-61
061-209
FEN 1-12-62
FEN 3-8-63

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CONTENTS-SALES
CATALOG
Catalog #25 corrections
Change in plug-in type designation, 8-15-62
DEMO
Demo tips, 6-16-61
Modified products
TEK 2A63 PRB 1-17-67 1

9-3l9
INSTRUMENTPERFORMANCECHARACTERISTIC
CHANGENOTICE
Change No. 2A63-l
-----
Instrument Type: ____ 2_A6....3____________________________ _
Publication affected: Catalog No. 25
------------------ Dated Apr 0 '66
Page: 148 Item -------------------------------
Bandwidth (ACLF -3 dB)
~add:
AC LF -3 dB
Reason for change:
Addition to catalog information
Approved by :__ (.=?........,,_V_.---"~'--·.,..'/_...,·____________ Effective date __ l_l_/_
2_9/_
6
_6 __ _
(Project Manager)

.

CATALOG
CHANGE IN PLUG-IN TYPE DESIGNATION
Sometime in the next few months Type 63 will be-
come Type 2A63.
The primary reason for the change is to make the
type-designations consistent with the new system.
TEK 2A63 IRB 1-25-64
SPR-131 8-15-62
Examples; 3S76, 3T77, 3A74, 3Al, 3Bl, 3B3.
Except for the 2B67, there will be no electrical dif-
ferences. Grey knobs instead of black knobs will
be a distinguishing mechanical difference on the
2A63.

DEMO
Jerry Racanelli (Union) points out that there are
some traps to avoid in demoing the Type 63 in the
560 or 561. A few new and unusual design features
in these instruments, plus some old familiar traps
await the field engineer who hasn'tthoroughlyfam-
iliarized himself with the instruments before the
demo.
1. The low rep-rate on the 560/561 calibrator
provides a much wider pulse (8.3 msec) than
the more familiar (500µsec) cal waveform--
meaning much more tilt with AC-coupling.
2. The calibrator being driven by60 cycles means
that any pickup in test leads between Cal Out
and Vert input will be locked into a calibrator
display, distorting the waveform badly.
3. The AC-stabilized feature of the Type 63 pro-
vides different coupling time constants in the
l-2-5-10-20mv/cm settings where it is in the
circuit.
4. ·The DC balance control in the Type 63 is a 10
turn pot--a planetary-drive job, for easy ad-
justment, but which feels a little like a normal
pot that has slipped its moorings.
So here's the good word from Jerry:
A. Use a shielded lead (P52 cable or probe), not
a red patch cord, to demo the high-sensitivity
ranges of the 63. Otherwise, you'll see some-
thing like Fig. 1.
TEK 2A63 IRB 1-25-64
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Fig. 1. 561 with Type 63.
1 MV/DIV, AC Stabilized,
input via red patch lead.
FEN 6-16-61
,...
-
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B. Be prepared to explain the operation of the AC-
stabilized circuit, and the procedure called out
in the Type 63 manual (070-266) for setting
DC balance. With a shileded lead and good DC
balance (save the balancing and DC-coupling
demo until after a few minutes' warm-up), a
waveform like Fig. 3 at 1mv/cm will be easy
as pie.
-
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r-- -I--; i--_ 1--..
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Fig. 2. AC-stabi Iized display.
Note approx. 50 msec time-
constant.
Fig. 3. DC-coupled, AC-stabi Iized
"off." About 50µv of 120-cycle
ripple is normal in 2mv calibrator
waveform.
1-25-64 TEK 2A63 IRB

Product Mod
2A63/RM565/3A75
2170
2A63 217F
2A63 236G
2A63 237E
2A63 243C
2A63 802G
2A63 802K
2A63 803E
TEK 2A63PRB
MODIFIED PRODUCTS
Description
Oversized panel. Panel must be anchored at top.
2 inputs paralleled to rear, oelrin. Tek ident removed.
Paint 24660. RFI.
2 vertical inputs paralleled to rear, BNC. Long tail and
internal release.
Letter of certification, Tek ident removed. Nameplate, new
panel.
Tek ident and type number removed. Cannonminiature coax
rear connector. No inputs. Newpanel. Iridite panel and
subpanel.
Twovertical inputs switchable to rear. Newpanel.
Twovertical inputs paralleled to rear through blue-ribbon
connector.
Twovertical inputs paralleled to rear, BNC.
10-12-66 l

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Inter-City Mfg. Co., Inc
St. LouisII, Mo.

CONTENTS-ENGINEERING
PERFORMANCE
AC-stabilized time-constants
Power drain, 5-21-65
Environmental characteristics, 1-23-65
TECHNOLOGY
Operating instructions
Circuit description
(Troubleshooting)
(Calibration)
TECHNIQUES
Diodes hilp with ground-loop problems, 10-11-63
TEK 2A63 RB 2-12-68