7B85: Difference between revisions

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The delay function (with digital delay and delta time read-out capability) differentiates the 7B85 from the otherwise similar [[7B80]].

The [[7B87]] is also similar to the 7B85 but provides an acquisition clock for a digital storage mainframe instead of a delay.

The [[7B85]]/[[7B80]] combination was introduced in 1976 to replace the 200 MHz [[7B71]]/[[7B70]] that had no delay read-out.

The [[7B85]]/[[7B80]] combination was introduced in 1976 to replace the 200 MHz [[7B71]]/[[7B70]] that had no digital delay read-out.

==Specifications==

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===Measurements===

These are examples of measurements with a [[7B85]] in the Horizontal A and a [[7B80]] in the Horizontal B compartment (of a [[7904]]).

Horizontal mode is set to alternating to show the pulse signal being triggered (A) and the delayed/magnified part (B).

File:7b85-risetime-5n.jpg ‎| Measuring rise time of a pulse. Delayed signal is scaled for 0-100% on graticule. Delay time is adjusted so the trace crosses the 10% level on the center line. Delta time is adjusted to so the delta-delayed trace crosses 90% on the same vertical line. Delta time readout indicates rise time directly.

File:7b85-risetime-10n.jpg | Measuring rise time of a pulse. Same as before, rise time increased to 10 ns (HP8112A generator).

File:7b85-pulse-width.jpg ‎| Pulse width measurement. Delayed signal and delta-delayed trace cross at 50%. Delta time readout indicates pulse width directly.

File:7b85-period-1.jpg | Pulse period measurement. Delta time is adjusted to overlay the delayed trace with one delayed by an additional period. In this picture, the two traces do not yet overlay exactly.

File:7b85-period-2.jpg | Pulse period measurement. Two traces overlay, delta tie reads pulse period.

</gallery>

@@ Line 15: / Line 15: @@
 The delay function (with digital delay and delta time read-out capability) differentiates the 7B85 from the otherwise similar [[7B80]].
 The [[7B87]] is also similar to the 7B85 but provides an acquisition clock for a digital storage mainframe instead of a delay.
-The [[7B85]]/[[7B80]] combination was introduced in 1976 to replace the 200 MHz [[7B71]]/[[7B70]] that had no delay read-out.
+The [[7B85]]/[[7B80]] combination was introduced in 1976 to replace the 200 MHz [[7B71]]/[[7B70]] that had no digital delay read-out.
 ==Specifications==
@@ Line 53: / Line 54: @@
 ===Measurements===
+These are examples of measurements with a [[7B85]] in the Horizontal A and a [[7B80]] in the Horizontal B compartment (of a [[7904]]).
+Horizontal mode is set to alternating to show the pulse signal being triggered (A) and the delayed/magnified part (B).
 <gallery>
+File:7b85-risetime-5n.jpg  ‎| Measuring rise time of a pulse.  Delayed signal is scaled for 0-100% on graticule.  Delay time is adjusted so the trace crosses the 10% level on the center line.  Delta time is adjusted to so the delta-delayed trace crosses 90% on the same vertical line.  Delta time readout indicates rise time directly.
+File:7b85-risetime-10n.jpg | Measuring rise time of a pulse.  Same as before, rise time increased to 10 ns (HP8112A generator).
+File:7b85-pulse-width.jpg  ‎| Pulse width measurement.  Delayed signal and delta-delayed trace cross at 50%.  Delta time readout indicates pulse width directly.
+File:7b85-period-1.jpg | Pulse period measurement.  Delta time is adjusted to overlay the delayed trace with one delayed by an additional period. In this picture, the two traces do not yet overlay exactly.
+File:7b85-period-2.jpg | Pulse period measurement.  Two traces overlay, delta tie reads pulse period.
 </gallery>

7B85: Difference between revisions

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