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PG505: Difference between revisions
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|discontinued=(?) | |discontinued=(?) | ||
|designers= |manuals= | |designers= |manuals= | ||
* [[Media:070-1583-01.pdf|Tektronix PG505 Manual]] | * [[Media:070-1583-01.pdf|Tektronix PG505 Manual 070-1583-01]] | ||
: '''''See erratum''''' | |||
}} | }} | ||
The output section is isolated from chassis ground and can float up to ±200 V. | The output section is isolated from chassis ground and can float up to ±200 V. | ||
{{BeginSpecs}} | {{BeginSpecs}} | ||
{{Spec | Period | {{Spec | Period | 10 μs to 100 ms in decade steps, one custom position (≥10 μs), variable control ×1 to ×10 }} | ||
{{Spec | Pulse width | {{Spec | Pulse width | 5 μs to 50 ms in decade steps, one custom position (≥5 μs), variable control ×1 to ×10 }} | ||
{{Spec | Rise/Fall times | 1 ms to | {{Spec | Rise/Fall times | 1 ms to 1 μs in decade steps, variable control ×1 to ×20 }} | ||
{{Spec | Amplitude | {{Spec | Amplitude | ±4 to min. ±80 V from a 4 kΩ source, floating up to ±200 V to chassis ground (with grounding strap removed, see note) }} | ||
{{Spec | Trigger output | {{Spec | Duty cycle | min. pulse width to 99% }} | ||
{{Spec | Input | Delay, 0 – 10 V; Ext. Duration, ≥0.5 V (TTL) active; ≥10 kΩ }} | |||
{{Spec | Gate input | +5 V to inhibit free-running rate generator (rear interface only) }} | |||
{{Spec | Trigger output | min. +4 V into 10 kΩ / 3 V into 600 Ω, same duration as output }} | |||
{{EndSpecs}} | {{EndSpecs}} | ||
| Line 23: | Line 27: | ||
{{Documents|Link=PG505}} | {{Documents|Link=PG505}} | ||
{{PatentLinks|PG505}} | {{PatentLinks|PG505}} | ||
===Notes=== | |||
* '''''Manual erratum:''' In manual 070-1583-01, Fig. 4.3 Output Delay Range Check (p. 4-5), the PG 505 connections are drawn correctly but the connector labels are swapped – the left connector fed from the FG501A via the BNC "T" is the Delay/Duration input, not the output.'' | |||
* The PG505 is shipped with the output connector ground connected to chassis ground through a removable ground strap. This must be cut/removed to float the output, in which case output common remains grounded through a 100 kΩ resistor (R545). The manual says this resistor may be removed but doing so causes unspecified "degradation of performance". | |||
==Operation== | |||
The main controls are a pair of concentric switches for pulse period and pulse duration, with the latter mechanically limited to prevent the duration range to be set higher than the period range. | |||
In the leftmost position of the duration switch, the output is locked in its "on" state so that the amplitude can be set conveniently with a DC voltmeter attached to the output. | |||
The second-rightmost position of either switch is reserved for a custom period or duration that is defined by an optional, customer-installed capacitor for each. | |||
Two pairs of test point lugs on the circuit board (near the cam switch cover) are provided to install these capacitors. | |||
In the rightmost position of the period switch ("OUTPUT DELAYED"), the rate generator is disabled. | |||
The signal on the Delay/Ext Duration input, assumed to be a positive-going 10 V ramp, is compared to the setting of the Output Delay potentiometer. | |||
When the ramp reaches the threshold, an output pulse of the set duration is triggered. | |||
When the duration switch is put in the rightmost position (which mechanically forces the period switch to the same), both the rate and duration generator circuits are disabled. | |||
In this "EXT DURATION" mode, the output simply follows the Delay/Ext Duration input | |||
==Rear Interface== | ==Rear Interface== | ||
| Line 28: | Line 50: | ||
* B24: Ext Delay In (9A/9B ground) | * B24: Ext Delay In (9A/9B ground) | ||
* B24: Ext Gate In (9A/9B ground) | * B24: Ext Gate In (9A/9B ground) | ||
Family key: Signal source (between pins 23 and 34) | |||
==Internals== | |||
The rate generator (free-running, discrete) and duration generator (a Fairchild 9601 TTL monoflop) are operating on the chassis-referenced power rails. | |||
A small toroidal transformer couples the generated pulse to the output section in the form of differentiated positive and negative pulses. | |||
On the floating side, a Schmitt trigger section restores the square pulse, which steers the output of a pair of current sources via a diode bridge into one of four switch-selected capacitors to create the variable rise and fall time. | |||
The output amplifier has a dual FET ([[2N3958]]) source follower input, with the switching threshold set by the Delay potentiometer. | |||
Two half-wave rectifiers, fed by the series-connected floating 25 V mainframe transformer windings, produce an unregulated floating supply of about ±65 V, from which regulated +48 V, +20 V, –10 V, –10 V, –20 V, and –48 V are derived. | |||
Depending on the selected output polarity, either +48 or –48 (less an adjustable component) V is referenced to output ground. The push-pull output stage therefore has about 96 V supply available. | |||
The output is short-circuit protected by a fixed 4 kΩ series resistor. | |||
==Prices== | ==Prices== | ||
| Line 33: | Line 68: | ||
|- | |- | ||
! Year | ! Year | ||
! 1974 | |||
! 1975 | ! 1975 | ||
! 1980 | ! 1980 | ||
! 1982 | |||
|- | |- | ||
! Catalog Price | ! Catalog Price | ||
| align="right" | $265 | |||
| align="right" | $295 | | align="right" | $295 | ||
| align="right" | $550 | | align="right" | $550 | ||
| align="right" | $840 | |||
|- | |- | ||
! In 2024 Dollars | ! In 2024 Dollars | ||
| align="right" | $1,700 | |||
| align="right" | $1,700 | | align="right" | $1,700 | ||
| align="right" | $2,100 | | align="right" | $2,100 | ||
| align="right" | $2,700 | |||
|} | |} | ||
==Pictures== | ==Pictures== | ||
<gallery> | <gallery> | ||
Tek pg505 front1.jpg | |||
Tek pg505 front2.jpg | |||
Tek pg505 rear.jpg | |||
Tek pg505 top.jpg | |||
Tek PG505 circuit_board.jpg | | |||
Tek PG505 output.jpg | Output connector – not ground strap (to chassis lug) | |||
Tek pg505 1.jpg | Tek pg505 1.jpg | ||
Tek pg505 2.jpg | Tek pg505 2.jpg | ||
Tek pg505 3.jpg | Tek pg505 3.jpg | ||
Tek pg505 4.jpg | Tek pg505 4.jpg | ||
Tek pg505 5.jpg | Tek pg505 5.jpg | ||
Tek pg505 6.jpg | Tek pg505 6.jpg | ||
Tek pg505 7.jpg | Tek pg505 7.jpg | ||
</gallery> | </gallery> | ||
==Components== | ==Components== | ||
{{Parts|PG505}} | {{Parts|PG505}} | ||