2245

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The Tektronix 2245 is a 100 MHz four-channel analog oscilloscope, introduced in 1987 (2245A in 1988).

Channels 1 and 2 are full-featured, whereas 3 and 4 are limited in both deflection factor and coupling, as they are intended mainly for digital and trigger signals.

The 2245 includes features like AUTO SETUP which automatically adjusts vertical, horizontal, and triggering and display controls to provide a stable, triggered display of the waveform in seconds. It offers a dual time base with delayed sweep, and cursor time/voltage measurements with on-screen readout of cursor data and scale factors.

Key Specifications

Bandwidth	100 MHz
Deflection	CH 1, CH 2: 2 mV/div to 5 V/div in 1-2-5 seq; CH 3, CH 4: 0.1 V/div and 0.5 V/div, all ±2%; BW limit: 20 MHz ±15%
Vertical modes	CH1,2,3,4, CH2 Invert, Add, Alt, Chop (625 kHz)
Input impedance	1 MΩ ±1.0% // 20 pF ±1 pF
Maximum input	400 V (DC + peak AC) or 800 V (p-p ac at ≤ 10 kHz)
Sweep	A Time Base: 0.5 s/div to 20 ns/div in 1-2-5 seq; B Time Base: 5 ms/div to 20 ns/div in 1-2-5 seq (×10 magnifier to 2 ns/div)
Trigger	DC, Noise Reject, HF Reject, LF Reject, AC, TV Line, TV Field
Trigger modes	A Mode: Auto Level, Auto, Norm, TV Line, TV Field, Single Seq. B Mode: Runs After Delay, Auto Level, Norm, TV Line (From A Source)
Cursors	Time, Volts
Interface	Ext Counter/Timer Base Input connector; Ext Z-Axis Input connector
CRT	Acceleration 16.4 (−2.7/+13.7) kV
Probes	Two P6109 100 MHz ×10 probes, BNC connector with a readout pin
Power	90 − 250 VAC, 48 − 445 Hz; 100 W max.

Repair Information

• 2245 Power Supply Repair Information

Links

Backup Battery in Tek 2245A

Pictures

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  2245A

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  2245A

CRTs used in the 2245

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CRTs used in the 2245A

Page	Part nos	Description	Designers	Used in
T4656	154-0905-00	CRT		2245A • 2246 • 2246A • 2247A

Custom ICs used in the 2245

Custom ICs used in the 2245A

Page	Model	Part nos	Description	Designers	Used in
155-0322-00	M429	155-0322-00	vertical output amplifier		2245A • 2246
156-2654-00	156-2654-00	156-2654-00	ECL "fast logic"		2245A • 2246
156-2655-00	156-2655-00	156-2655-00	"slow logic"		2245A • 2246
165-2232-01	165-2232-01	165-2232-01	buffer amplifier		2245A
234-0203-20	M376-003	234-0133-20 • 234-0203-20 • 234-0238-20	amplifier		2245A • 2246
234-0401-20	234-0401-20	234-0401-20 • 234-0401-21	horizontal preamplifier		2245A • 2246
M376-004	M376-004	234-0204-20 • 234-0239-30 • 234-0239-31	trigger		2245A • 2246
M377	M377	165-2129-03 • 165-2089-06 • 155-2089-05	amplifier	John Addis	11A16 • 11A32 • 11A33 • 11A34 • 11A52 • 2245 • 2245A • 2247 • 2247A • 2252 • TDS410 • TDS420 • TDS460 • TDS520D • TDS540D • TDS580D • TDS680C • TDS684C • TDS714L • TDS724D • TDS754D • TDS784D