131: Difference between revisions

Revision as of 20:44, 5 April 2023

Tektronix Type 131
Current Probe Amplifier Type 131 Model 4 Current Probe Amplifier Produced from 1960 to (?) Manuals Tektronix P6016 manual (includes 131 schematics) (All manuals in PDF format unless noted otherwise)

Manuals – Specifications – Links – Pictures

The Tektronix Type 131 is a current probe amplifier used only with the P6016 current probe. Type 131s were never given serial numbers, instead, they were produced chronologically in "Models." Models 1 thru 3 looked alike, while Model 4 got a redesigned enclosure like that used later by the Type 134.

Key Specifications

Sensitivity	1 mA/Div to 1 A/Div, 1−2−5 (scope input fixed at 50 mV/Div)
Noise	0.1 mA_p-p
Risetime	20 ns (eq. 17 MHz −3 dB bandwidth)
Lower frequency limit	50 Hz
Delay time	32 ns typ.

(all specifications are overall values including the P6016 probe)

Connectors

All models of the 131 use a BNC input connector.

The vast majority of 131s, including all the Models 1 thru 3, have a UHF output connector. 131 Model 4s with UHF outputs were Tektronix #015-0029-00.

A few very late 131 Model 4s were supplied with a locking BNC output connector, as Tektronix #015-0050-00.

Internals

All four Type 131 models used PNP transistors, thus requiring a negative power source. Models 1 thru 3 were hard-wired to their separate minus ~19 V power supplies, while Model 4 got a power supply, 015-027 for 115 V_AC, with a proprietary Tektronix coaxial connector. While the Type 134 uses the same coaxial power supply connector, the power supplies are not interchangeable. So the Type 131 Model 4 will only work with the correct 015-027 power supply.

See the Type 131 power supply page for more information.

Pictures

Type 131 Model 3 Front
Type 131 Model 3 with P6016
Type 131 Model 3, with attached power supply
Type 131 Model 3, with UHF to BNC adaptor
Type 131 Model 3
Type 131 Model 3
Type 131 Model 3
Type 131 Model 3
Type 131 Model 3
Type 131 Schematic, Models 1-3
Type 131 Model 4 Front
Type 131 Model 4 Side View

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 ==Internals==
-All four Type 131 models used PNP transistors, thus requiring a negative power source. Models 1 thru 3 were hard-wired to their separate minus ~19 V power supplies, while Model 4 got a power supply, [[015-027]] for 115 V<sub>AC</sub>, with a proprietary Tektronix coaxial connector.  The center pin of the Type 131 Model 4 power supply connector is grounded, so the outer contact is ~19 V negative. Note that the [[015-0058-01]] power supply for the Type [[134]] uses the same connector with the same relative voltage levels (center conductor ~19 V more positive than the outer contact) but the negative outer contact on the Type [[134]] power supply is held close to ground. So the Type 131 Model 4 will only work with the correct [[015-027]] power supply.
+All four Type 131 models used PNP transistors, thus requiring a negative power source. Models 1 thru 3 were hard-wired to their separate minus ~19 V power supplies, while Model 4 got a power supply, [[015-027]] for 115 V<sub>AC</sub>, with a proprietary Tektronix coaxial connector. While the Type [[134]] uses the same coaxial power supply connector, the power supplies are not interchangeable. So the Type 131 Model 4 will only work with the correct [[015-027]] power supply.
-Using the wrong power supply with either amplifier type will short circuit the power supply output. Tektronix claims that this will not damage the Type 134 power supply (015-0058-01) if connected to a Type 131. Damage to the Type 131 [[015-027]] power supply seems likely if it is connected to a Type [[134]]. Damage to the amplifier itself is unlikely either way.
+See the Type 131 [[015-027 | power supply page ]] for more information.
-Power supplies for Type [[134]]s are labeled "POWER SUPPLY FOR TYPE [[134]]", while those for Type 131 Model 4 have no marking other than Tektronix and [[015-027]]. All Type 131 power supplies have the AC line connector built onto the end of the power supply housing. Early [[134]] power supplies share the same construction, while later [[134]] power supplies came with a ~1 m AC line cord and plug.
-==Accessories==
-The Type 131 Model 4 could be purchased with a battery adapter instead of a power supply. The 131 / battery adaptor set was sold as a Tektronix 015-026. The adaptor was simply a pair of wires, ending in fork lugs, that came together in a socket that mated with the 131 Model 4 power cord. See [[015-027 | here ]] for more information
 ==Pictures==