Tektronix 7904 Oscilloscope Specifications - Used Test Equipment at Test Equipment Depot

VERTICAL SYSTEM
Channels		Two left-hand plug-in compartments; compatible with all 7000 Series Plug-Ins. Bandwidth determined by mainframe and plug-in unit.
Modes of Operation		LEFT, ALT, ADD, CHOP, RIGHT
Chopped Mode		Repetition rate is approx. 1 MHz.
Trace Separation Range (Dual-sweep Modes)		The B trace can be positioned 4 divisions above or below the A trace
Delay Line		Permits viewing leading edge of displayed waveform when using 7B80 and 7B90 Series Time Bases. 7B50 Series not recommended.
HORIZONTAL SYSTEM
Single Channel		Two right-hand plug-in compartments; compatible with time bases of the 7B80 and 7B90 Series. 7000 Series Vertical Amplifiers and specialized plug-ins may also be used.
Fastest Calibrated Sweep Rate		500 ps/div with the 7B92A.
Chopped Mode		Repetition rate is approx. 200 kHz
X-Y Mode		Phase shift is within 2° from dc to 35 kHz without phase correction (dc to 1 MHz with phase correction, Option 02) between vertical and horizontal channels. Bandwidth is dc to at least 1 MHz.
CRT AND DISPLAY FEATURES
Standard		Internal 8 X 10 cm graticule with variable illumination. Accelerating potential is 24 kV with P31 Phosphor standard.
Option 01, without CRT readout		No CRT readout
Option 04, Max Brightness CRT With Reduced Area		Internal 4 X 5 cm graticule with variable illumination. Accelerating potential is 24 kV. P11 Phosphor provides max writing rate. This provides extremely high photographic and information writing speed and increases the visibility of low-rep-rate, high-speed signals.
Option 78, P11 Phosphor
Minimum Photographic Writing Speed Using the Optional P11 and Polaroid 3000 ASA Film without Film Fogging		Polaroid Film		Relative Writing Speed
		ASA	Types	Without Fogging	With Fogging
		3000	107 084 47	1 (reference)	3
		10000	410	2	4
In typical applications, P31 Phosphor has approximately one-half the writing speed of P11 Phosphor. The writing speed can be increased by using controlled film fogging with a writing speed enhancer (camera accessory) or by using Polaroid 10,000 ASA film or both. The following table lists the approximate relative writing speed gains that can be achieved using these techniques.
Polaroid Film		Relative Writing Speed
ASA	Types	Without Fogging		With Fogging
3000	107 084 47	1 (reference)		3
10000	410	2		4
Autofocus		Reduces the need for additional manual focusing with changes in intensity after focus control has been set.
Beam Finder		Limits display within graticule area
External Z-Axis Input		2 V p-p for full intensity range. A positive signal blanks the trace. Max input voltage is 15 V (dc + peak ac) and p-p ac. Input is dc coupled.
CALIBRATOR
Output Waveshape		Rectangular positive-going from ground, 1 kHz (± 0.25%), dc or B Gate/2
Voltage Ranges		4 mV, 40 mV, 0.4 V, 4 V, 40 V into an open circuit; 2 mV, 20 mV, 0.2 V, 0.4 V into 50 W (± 1%).
Current Output		40 mA dc or 1 kHz
OUTPUTS/INPUTS
+Sawtooth		Sawtooth starts 1 V or less from ground (into 1 MΩ). Internally selectable from A or B horizontal. Output voltage is 50 mV/div (± 5%) into 50 Ω, 1 V/div (± 10%) into 1 MΩ. Output R is approx. 950 Ω.
+Gate		Positive-going rectangular waveform derived from A, B or Delayed Gate, internally selectable. Output voltage is 0.5 V (± 10%) into 50 Ω, 10 V (± 10%) into 1 MΩ. Rise time is 5 ns or less into 50 Ω, output R is approx. 950 Ω.
Sig Out		Selected by B TRIGGER SOURCE switch. Output voltage is 25 mV.div into 50 Ω, 0.5 V/div into 1 MΩ. Bandwidth depends upon vertical plug-in. See the Vertical System Specifications Chart.Output R is approx. 950 Ω.
Camera Power		Three-prong connector to the left of the crt provides power, ground, and remote single-sweep reset access for the C-50 Series Cameras.
Probe Power		Two rear-panel connectors provide correct operating voltages for two active probes.
POWER REQUIREMENTS		Line voltage ranges, 90 to 132 V ac and 180 to 264 V ac. Line frequency, 48 to 440 Hz. Max power consumption, 160 W, 2 A at 115 V line, 60 Hz.
Dimensions		59.2 cm X 30.5 cm X 34.3 cm (L X W X H)
Weight		approx. 32 lb (14.5 kg)