Telequipment D75

Manuals – Specifications – Links – Pictures

The Telequipment D75 is a 50 MHz scope. It is a horizontal version of the Telequipment D83 with a smaller CRT. The government version of the D75 is the D755.

The D75 takes two plug-ins that are also compatible with D83, D63 and DM63. Vertical plugins include the V4 dual trace amplifiers, the V3 single channel differential amplifier, the V1 single channel amplifier, and the V5 single channel amplifier with delay line (primarily intended for the DM63/D63 mainframes that have no built-in delay lines, whereas D75/D83 do). Timebase plugins include the S1 single timebase and S2 dual timebase. Calibration fixtures include the 067-0672-00 plug-in for the vertical slot and the 067-0673-00 plug-in for the horizontal slot.

Key Specifications

Bandwidth	DC Coupled DC to 50 MHz (−3 dB) and AC Coupled 2 Hz to 50 MHz (−3 dB)
Deflection Factors	5 mV/div to 20 V/div in 12 calibrated steps (1−2−5 sequence)
Timebase A	2 s/div to 100 ns/div in 23 calibrated steps (1−2−5 sequence)
Timebase B	1 s/div to 100 ns/div in 22 calibrated steps (1−2−5 sequence)
Trigger Modes Timebase A	Auto, DC, AC, HF Reject
Trigger Modes Timebase B	Auto, AC
Trigger Sources	CH1, CH2, Alternate
Input Voltage	max. 400 V DC + AC peak
Rise time	7 ns
Input Impedance	1 MΩ // 29 pF
Operating Modes	CH1, CH2, CH1/CH2 Alt, Chopped, CH1 and CH2 added, CH2 inverted
Sweep Modes	A only, A intensified by B, B delayed by A, A and B mixed, delayed B variable or triggered, repetitive or single shot
Delay Time	10 μs to 20 s
Calibrator	~1 kHz, 30 mV and 300 mV, 3 mA, square wave, ±1% voltage and current, ±20% frequency
CRT	154-0676-10 tube, P31 phosphor, 15 kV acceleration, 8 cm × 10 cm graticule
Mains Voltage	100 V − 125 V in 5V steps, 200 V − 250 V in 10 V steps, selected via primary voltage selector, 40 Hz to 400 Hz
Power Consumption	85 VA
Dimensions and Weight	Height: 136 mm, Width: 380 mm, Depth: 470 mm, Weight: 11.4 kg
Temperature limits	Operating: −5°C to +40°C, Non-operating: -25°C to +70°C

D75 Plug-In Variations

D75 comprises

(a) 50MHz Dual-Channel Amplifier - Type V4

(b) Dual Sweep Unit - Type S2A

D751 comprises

(a) Differential Amplifier - Type V3

(b) Single Sweep Unit - Type S1A

D752 comprises

(a) Differential Amplifier - Type V3

(b) Dual Sweep Unit - Type S2A

D755 comprises

(a) 50MHz Dual-Channel Amplifier - Type V4

(b) Dual Sweep Unit with X-Y facility - Type S2C

Standard Options

Option 4

P7 C.R.T. and amber filter fitted in place of P31 C.R.T. and blue filter

Option 6

Supplied as 115V and fitted with U.S.A. power cord

Special Types

There was a special version of this oscilloscope for post offices, the Post Office Oscilloscope Type 16A. This version had a build in graticule illumination with a brightness control knob on the back panel behind the ETH transformer.

Links

• Telequipment D75 @ radiomuseum.org

Internals

According to this posting, the CRT is a 154-0676-10 Tektronix CRT, the same as in the 465.

Pictures

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75

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  Telequipment D75 with V4 and S2A Plug-ins

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  Telequipment D75 with V4 and S2A Plug-ins

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  Telequipment D75 with V4 and S2A Plug-ins

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  Telequipment D75 with V4 and S2A Plug-ins

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  Telequipment D75 with V4 and S2A Plug-ins

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  Telequipment D75 with V4 amplifier and S2A dual sweep unit

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  Telequipment D75 with V4 amplifier and S2A dual sweep unit (front view)

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  Telequipment D75 with V4 amplifier and S2A dual sweep unit (back view)

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  Telequipment D75 with V4 amplifier and S2A dual sweep unit (top view)

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  Telequipment D75 with V4 amplifier and S2A dual sweep unit (top view without cover)

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  Telequipment D75 with V4 amplifier and S2A dual sweep unit (bottom view)

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  Telequipment D75 with V4 amplifier and S2A dual sweep unit (bottom view without cover)

CRTs used in the Telequipment D75

Custom ICs used in the Telequipment D75

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