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Type 1A7 is a high-sensitivity differential plug-in for [[500-series scopes]].
{{Plugin Sidebar 2 |
It senses down to 10uV/div, either AC or DC-coupled.  It's possible to
title=Tektronix 1A7 |
apply up to +/-300mV offset to the reading while maintaining sensitivity.
summary=Differential amplifier |
image=Tek 1a7a 2.JPG |
caption=Tektronix 1A7A |
introduced=1965 |
discontinued=1975 |
series=[[500-series scopes]] |
manuals=
* [http://w140.com/mmm/tek-1a7.pdf Tektronix 1A7 Manual (PDF)]
* [http://w140.com/tek_1a7a.pdf Tektronix 1A7A Manual (PDF)]
* [[Media:Tek 1a7a product reference book.pdf|Tektronix 1A7A Product Reference Book (PDF)]]
* [[Media:Tek 1a7a fcp april 1968.pdf|Tektronix 1A7A Factory Calibration Procedure, April 1968]]
}}
The '''Tektronix Type 1A7''' is a high-sensitivity differential plug-in for [[500-series scopes]].
It senses down to 10 μV/Div, either AC or DC-coupled.  It's possible to
apply up to ± 300 mV offset to the reading while maintaining sensitivity.
Upper and lower cutoff frequency is selectable on the front panel.
Upper and lower cutoff frequency is selectable on the front panel.
Maximum bandwidth is 500kHz, and common-mode rejection is 50,000 to 1.
Maximum bandwidth is 500 kHz, and common-mode rejection is 50,000 to 1.


Type 1A7's front end is a matched quad of [[7586]] [[nuvistor|nuvistors]],  
Type 1A7's front end is a matched quad of [[7586]] [[nuvistor|nuvistors]],  
Line 11: Line 25:
heater voltages on the 7586's.
heater voltages on the 7586's.


Type 1A7 was [[introduced in 1966]].  In 1968 it was superseded by
Type 1A7 (initially named [[F|Type F]]) was designed by [[John Addis]] and [[introduced in 1966]].   
the FET-equipped Type 1A7A, which also doubled the bandwidth
 
and the common-mode rejection. Type 1A7A remained available
====Type 1A7A====
until the end of the [[500-series scopes|500-series]] line after 1974.
In 1968, the 1A7 was superseded by the FET-equipped '''Type 1A7A''' (designed by [[Thor Hallen]]),  
which also doubled common-mode rejection and bandwidth (to 1 MHz).
 
The 1A7A's differential amplifier design was re-used with some modifications
in the [[3A9]], [[3A10]], [[7A22]], [[5A22N]] and [[5030]]/[[5031]] scopes. The [[AM502]] and [[26A2]] use BJTs instead of JFETs for the offset current sources.
 
Type 1A7A remained available until the end of the [[500-series scopes|500-series]] line.
 
{{BeginSpecs}}
{{Spec | Deflection | 10 μV/Div to 10 V/Div in 1–2–5 sequence }}
{{Spec | Input impedance | 1 MΩ // 47 pF (either input) }}
 
{{SpecGroup | 1A7}}
{{Spec | Bandwidth | 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 100 kHz in ×3/×10 steps, and 500 kHz; AC coupling 1.6 Hz }}


* [http://w140.com/mmm/tek-1a7.pdf Tektronix 1A7 Manual (PDF)]
{{SpecGroup | 1A7A}}
* [http://w140.com/tek_1a7a.pdf Tektronix 1A7A Manual (PDF)]
{{Spec | Bandwidth | 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 1 MHz in ×3/×10 steps, AC coupling 1.6 Hz }}
{{Spec | Signal ranges | }}
{| class="wikitable" border=1 style="margin-left: 8em;" |
!Range
! Differential signal
! DC Offset
! Common mode
|-
| 10 μV/Div to 10 mV/Div || ±0.4 V || ±0.4 V    || ±10 V
|-
| 20 mV/Div to 0.1 V/Div || ±4 V  || ±4 V    || ±100 V
|-
| 0.2 V/Div to 1 V/Div  || ±40 V  || ±40 V  || ±500 V
|-
| 2 V/Div to 10 V/Div    || ±400 V || ±400 V  || ±500 V
|-
|}
{{EndSpecs}}


==Pictures==
===1A7===
<gallery>
Tek 1a7 front.jpg
Tek 1a7 top.jpg
Tek 1a7 right.jpg
Tek 1a7 left.jpg
Tek 1a7 bottom2.jpg
Tek 1a7 bottom.jpg
Tek 1a7 in 133 1.jpg|1A7 in [[133]]
Tek 1a7 in 133 2.jpg|1A7 in [[133]]
Tek 1a7 in 133 3.jpg|1A7 in [[133]]
Tek 1a7 top2.jpg|1A7
Tek 1a7 right2.jpg|1A7
Tek 1a7 left2.jpg|1A7
Tek 1a7 left rear2.jpg|1A7
Tek 1a7 front2.jpg|1A7
</gallery>
===1A7A===
<gallery>
<gallery>
File:Tek 1a7a 1.JPG|1A7A
Tek 1a7a 1.JPG|1A7A
File:Tek 1a7a 2.JPG|1A7A
Tek 1a7a bf.jpg|1A7A
File:Tek 1a7a 3.JPG|1A7A
Tek 1a7a 2.JPG|1A7A
File:Tek 1a7a 4.JPG|1A7A
Tek 1a7a 3.JPG|1A7A
File:Tek 1a7a 5.JPG|1A7A
Tek 1a7a 4.JPG|1A7A
File:Tek 1a7a 6.JPG|1A7A
Tek 1a7a 5.JPG|1A7A
Tek 1a7a 6.JPG|1A7A
</gallery>
</gallery>
[[Category:Introduced in 1966]]
[[Category:500 series plugins]]
[[Category:Differential amplifiers]]

Revision as of 10:54, 8 June 2019

Template:Plugin Sidebar 2 The Tektronix Type 1A7 is a high-sensitivity differential plug-in for 500-series scopes. It senses down to 10 μV/Div, either AC or DC-coupled. It's possible to apply up to ± 300 mV offset to the reading while maintaining sensitivity. Upper and lower cutoff frequency is selectable on the front panel. Maximum bandwidth is 500 kHz, and common-mode rejection is 50,000 to 1.

Type 1A7's front end is a matched quad of 7586 nuvistors, with two in parallel - to reduce noise - on each input. These tubes are in temperature-equalizing housings, and mounted on a rubber-isolated subchassis. The "coarse" balance adjustment controls the relative heater voltages on the 7586's.

Type 1A7 (initially named Type F) was designed by John Addis and introduced in 1966.

Type 1A7A

In 1968, the 1A7 was superseded by the FET-equipped Type 1A7A (designed by Thor Hallen), which also doubled common-mode rejection and bandwidth (to 1 MHz).

The 1A7A's differential amplifier design was re-used with some modifications in the 3A9, 3A10, 7A22, 5A22N and 5030/5031 scopes. The AM502 and 26A2 use BJTs instead of JFETs for the offset current sources.

Type 1A7A remained available until the end of the 500-series line.

Key Specifications

Deflection 10 μV/Div to 10 V/Div in 1–2–5 sequence
Input impedance 1 MΩ // 47 pF (either input)
     — 1A7
Bandwidth 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 100 kHz in ×3/×10 steps, and 500 kHz; AC coupling 1.6 Hz
     — 1A7A
Bandwidth 1 MHz, LF limit switchable DC, 0.1 Hz to 10 kHz in ×10 steps, HF limit switchable 100 Hz to 1 MHz in ×3/×10 steps, AC coupling 1.6 Hz
Signal ranges
Range Differential signal DC Offset Common mode
10 μV/Div to 10 mV/Div ±0.4 V ±0.4 V ±10 V
20 mV/Div to 0.1 V/Div ±4 V ±4 V ±100 V
0.2 V/Div to 1 V/Div ±40 V ±40 V ±500 V
2 V/Div to 10 V/Div ±400 V ±400 V ±500 V

Pictures

1A7

1A7A