|Triggering to 200 MHz|
|Calibrated 20ns/div to 5s/div in 26 Steps|
|2ns/div with x10 Magnifier||
The 7B70 and 7B71 are horizontal TIME-BASE units intended primarily for use with the 7700-FAMILY mainframes
to provide bandwidth/sweep speed compatibility. However, the 7B70 and 7B71 may be used in any 7000-Series mainframe.
They are identical units except in two particulars. In combination, they provide a delaying-sweep mode of operation;
the 7B71 being the DELAYING SWEEP and the 7B70 the DELAYED SWEEP. The 7B70 also has a horizontal amplifier input for
uncalibrated X-axis deflection from an external source.
The calibrated TIME/DIV range is from 2 ns/div to 5 s/div. The 2 ns/div rate, obtained with the X10 MAGNIFIER,
complements the realtime capability of the 7700-FAMILY vertical systems.
Triggering control is very flexible with 12 push-button positions to program MODE, method of COUPLING, and SOURCE.
For routine applications, hands-off triggering is accomplished by actuating the three upper-most push-button switches:
INT source, AC COUPLING, and P-P AUTO MODE which is the most generally used combination. The new P-P AUTO MODE
provides a baseline trace in the absence of a signal and a triggered trace at any position of the LEVEL/SLOPE
control when a signal of 0.5 div or greater is present. Except for the selection of + or - SLOPE this mode
is completely automatic. The other triggering positions are useful for specific applications.
The triggering frequency range is from DC to 200 MHz, selectable within that range by the method of COUPLING.
AC LF REJ attenuates undesirable trigger components below 30 kHz (60 Hz would be almost totally rejected);
AC HF REJ attenuates high-frequency components (above 50 kHz) which can cause triggering problems during
low-frequency applications. SINGLE-SWEEP functions with lighted READY indicators and manual reset are associated
with the trigger MODE controls.
For delaying-sweep operation, the 7B71 (occupying the A horizontal channel) contains the DELAY TIME MULTIPLIER
and control circuitry to release the 7B70 DELAYED SWEEP (B horizontal channel) at a predetermined point during
the delaying sweep. After release, the delayed sweep can be programmed to begin immediately or wait for the next
Both units can be used singly in all 7000-Series mainframes, or in combination to add the delaying-sweep
function. Independent dual-sweep operation is possible only in mainframes with two horizontal amplifers using
CHOP or ALT modes.
(excerpts from 1969 and 1973 Tektronix Catalogs>
|1- 1||366-1064-00||Knob,Gray (Level/Slope small front)|
|1- 2||354-0342-00||Ring, Knob Skirt (Level/Slope rear)|
|1- 4||214-1235-00||Drive, Turns Reduction (Level/Slope)|
|1- 6||366-1077-00||Knob,Gray (large outer) (Position)|
|1- 7||366-1319-00||Knob,Gray (small inner) (Fine Position)|
|1- 36||366-1189-00||Knob,Gray (Variable)|
|1- 45||366-1166-00||Knob,Red "CAL IN" (small inner) (Variable)|
|1- 44||366-1103-00||Knob,Gray "TIME/DIV" (larger outer)|
|1- 3(R146/S146)||311-0912-00||Res, Var 2.5K, 10K (level)|
|1- 8 (R744)||311-1162-00||Res, Var, 10K / 10 K (pos fine & coarse)|
|1- 37 (R194)||311-0091-00||Res, Var 1K (variable (amplifier))|
|1- 39 (R740)||311-0486-00||Res, Var 500 ohm (swp cal)|
|1- 123 (R531)||311-0959-00||Res, Var, 10K (var/cal)|
|U752||156-0077-00||Single operational amplifier, LM301A|
|U192||156-0077-00||Single operational amplifier, LM301A|
|U260||156-0049-00||Operational Amplifier, uA741C|
|U267||156-0049-00||Operational Amplifier, uA741C|
|Tektronix Catalog Cost||Low Bid||High Bid||average|
$26.00 8/28/01 #1630118011 bargainprospectors|
$26.00 8/28/01 #1630118011 bargainprospectors
$19.95 10/31/01 #1654550135 del1935
$14.30 11/9/01 #1658313389 judinkes
$15.50 1/15/02 #1687943735 steil
$19.27 1/23/03 #3108423987 jwalton1 (calibrated) (6 bids $1 start)