131: Difference between revisions

Revision as of 16:46, 30 March 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 connector for its output. 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. 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.

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.

Power supplies for Type 134s 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.

Pictures

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

@@ Line 14: / Line 14: @@
 * [[Media:070-237.pdf|Tektronix P6016 manual]] (includes 131 schematics)
 }}
-The '''Tektronix Type 131''' is a current probe amplifier used only with the [[P6016|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.
+The '''Tektronix Type 131''' is a current probe amplifier used only with the [[P6016|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.
 {{BeginSpecs}}
@@ Line 24: / Line 24: @@
 {{EndSpecs}}
 (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]] connector for its output. 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]], 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.  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.
-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.
+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.
 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.