31,818
edits
No edit summary |
No edit summary |
||
(40 intermediate revisions by 7 users not shown) | |||
Line 1: | Line 1: | ||
The 1A4 is a 1-series vertical plug-in | {{Plugin Sidebar | ||
|manufacturer=Tektronix | |||
|series=500-series scopes | |||
|type=1A4 | |||
|summary=50 MHz quad input amplifier plugin | |||
|image=Tek_1A4_Front_–_Tight.jpg | |||
|caption=Tektronix 1A4 front | |||
|introduced=1967 | |||
|discontinued=1974 | |||
|designers=Al Allworth | |||
|manuals= | |||
* [[Media:070-0545-00.pdf|Tektronix 1A4 Manual]] (PDF) / [https://w140.com/mmm/tek-1a4.pdf Alternate] | |||
* [[Media:Tek 1a4 fcp jan 1967.pdf|Tektronix 1A4 Factory Calibration Procedure, January 1967]] | |||
* [[Media:Tek 1a4 mods.pdf|Tektronix 1A4 Product Modification Index]] | |||
}} | |||
The '''Tektronix Type 1A4''' is a 1-series vertical plug-in for [[500-series scopes]]. | |||
It has four input channels and 50 MHz bandwidth. | |||
The | Type 1A4 was [[introduced in 1967]] and lasted until the end of the [[500-series scopes]] line. | ||
The four channels are grouped into two groups of two channels. | |||
Type 1A4 has a special "trace slaving" mode which, when used in a [[547]] mainframe, allows channels 1 and 2 to be displayed using the A time base, | |||
and channels 3 and 4 to be displayed with the B time base. This allows high-speed and low-speed signals to be displayed together, | |||
similar to what a dual-beam scope can do, but without some of the cost and complexity. | |||
Like the Type [[1A2]] and unlike the Type [[1A1]], the Type 1A4 has a Trigger Output selector that controls which channel provides triggering when the mainframe trigger is in Plug-In mode, | |||
for scopes having this feature ([[544]], [[546]], [[547]], [[549]], [[556]], late [[555]]). | |||
{{BeginSpecs}} | |||
{{Spec | Plug-in Bandwidth | DC to 50 MHz }} | |||
{{Spec | Maximum Input Sensitivity | 10 mV/div }} | |||
{{Spec | Rise time | 7 ns }} | |||
{{Spec | Input Impedance | 1 MΩ // 20 pF }} | |||
{{Spec | Maximum Input Voltage | 600 V combined DC and peak AC }} | |||
{{Spec | Signal Output Impedence | 50 Ω}} | |||
{{EndSpecs}} | |||
Cascaded operation using the Signal Out jack can achieve a sensitivity of approximately 200 μV/div AC with about 20 Hz - 1 MHz bandwidth. | |||
==Internals== | |||
The signal path of each channel begins with the signal passing through the attenuators. | |||
Then it is clamped by two diodes and applied to the gate of a JFET source follower. | |||
The source of the source follower is the trigger pickoff point. | |||
From there the vertical signal path goes through an NPN emitter follower, then an NPN differential amplifier, at which point the signal becomes differential. | |||
Next, the signal passes through an analog multiplexer made with [[1N4152]] silicon switching diodes. | |||
After the multiplexer network, the signal passes through a common base amplifier followed by [[6DJ8]] tube operating in common grid configuration. | |||
There is an "identify" switch for each channel, which when pressed shifts the trace up by ~3 mm, to aid identification of the corresponding signal/channel. | |||
This is achieved by offsetting position control circuitry with a small resistance to shift position. | |||
The 12.1 V and −15 V power for the plug-in is generated onboard using a step-up transformer, whose primary is connected to the 6.3 V heater supply from the mainframe and the two secondaries drive the onboard series regulators. | |||
==Pictures== | |||
<gallery> | |||
Tek_1A4_Front.jpeg | Front | |||
Tek 1A4_RHS.jpeg | RHS | |||
Tek_1A4_LHS.jpeg | LHS | |||
Tek_1A4_Top.jpeg | Top | |||
Tek_1A4_Bottom.jpeg | Bottom | |||
Tek 1A4_Iso.jpeg | Front/Side | |||
Tek 1a4 front n1.jpg | |||
Tek 1a4 left n1.jpg | |||
Tek 1a4 top n1.jpg | |||
Tek 1a4 right n1.jpg | |||
Tek 1a4 bottom n1.jpg | |||
Tek 1a4 rear n1.jpg | |||
Tek 1a4 frontclose n1.jpg | |||
1a4 front.jpg | |||
1a4 right2.jpg | |||
1a4 top.jpg | |||
1a4 bottom.jpg | |||
</gallery> | |||
[[Category:500 series plugins]] |