• 4 channels, DC - 400 MHz
• Maximum sensitivity of CH1 and CH2: 2 mV/div (at 400 MHz)
• Built-in 6-digit display counter can count frequencies up to 400 MHz
• Iwatsu Test Instruments Corporation-developed bright, sharp CRT
  For the most important part of the analog oscilloscope -the CRT- Iwatsu Test Instruments Corporation uses its own original CRT. Based on our more than 40 years experience in CRT design, this advanced model features superlative brightness and sharpness that even allows you to easily observe signals with slow repetition and a high-speed rise.
• DC offset function (CH1, CH2)
  This function is convenient when you need to observe a signal with a very small amplitude superimposed over a signal with a large amplitude. It's especially useful when observing high-frequency noise superimposed over video signals or the ripple of a high-voltage DC power supply. DC offset equivalent to ±500 div max. can be applied.
• TV / HDTV triggering
  Field (EVEN, ODD, BOTH) and line selection is possible for NTSC, PAL (SECAM), HDTV.
• TV clamp (Pedestal clamp) function (CH1, CH2)
  A function that displays the backporch level of a composite signal fixed to ground level can be used to conveniently monitor signals that deviate from the average voltage.
• Event trigger
• High-speed automatic setup function sets optimum vertical and time axes as well as trigger level at the push of a button
• Save and recall functions for setting up to 256 items on the panel

1) High-brightness CRT (Japan made): 6-inch, meshless CRT with internal graticule displays waveforms with bright and sharp traces.  2) High-accuracy 6-digit frequency counter: A frequency counter with ±0.0025% accuracy is built in.  3) Save/recall function: Up to 256 different setups with 12-character comments can be saved and recalled.  4) Wide frequency bandwidth of DC - 470MHz (SS-7847A)/400MHz (SS-7840A)/300MHz (SS-7830A): CH1/CH2 sensitivity: 2 mV/div; CH3/CH4: 100 mV/div or 500 mV/div selectable (1 Mω/50 ω).  5) Power supply output terminals for FET or current probe: Optional SFP-5A/4A (DC - 1GHz/800MHz) FET probe and SS-250 (100MHz)/SS-240A (50MHz) current probe can be used.  6) Powerful TV triggering TV-H, ODD, EVEN or BOTH fields can be selected. Line selection is possible from NTSC: 1 - 525H, PAL (SECAM): 1 - 625 and HDTV: 1 - 1125.  7) Direct selection of the cursor measurement  Alternates Dt and DV. Up to four cursors can be displayed simultaneously.  8) Quick auto setup Automatically displays an optimum range for input waveform (CH1/CH2).

Eye-patterns in optical disc manufacturing process

When evaluating optical discs such as Blu-ray Discs, HD-DVDs, CDs or DVDs, eye patterns need to be observed. With this analog oscilloscope, accurate observation of the eye patterns of high-speed and high-density media is easily possible.
* Blu-ray Disc signal eye pattern waveform

Video head frequency modulation signals
Input and output signals to/from video heads are frequency modulation waveforms. The voltage of recorded or read-out signals to/from the video heads is specified. To observe these FM signals, an analog oscilloscope is indispensable.
* VHS deck head signal waveform

ATM 155 Mbps signal eye patterns
The standard transmission rate for most networked communication systems is 155 Mbps (STM-1). The amount of jitter can be estimated by observing the signal waveform with the eye pattern and following the pulse mask standard.
* 155 Mbps signal eye pattern waveform measured with SS-7847A (DC - 470MHz)

Full TV triggering
TV-V (ODD field, EVEN field, BOTH fields) and TV-H are available. Line number selection in TV-V mode is useful for detailed evaluation of video signals. HDTV can be selected, as well as NTSC or PAL/SECAM (except for SS-7805A/7804A/7802A)

Switching power supply measurement

A switching power supply unit with a higher harmonics measure switches the voltage of a commercial power supply at high speed. In terms of circuit operation, switching stops at the zero cross of the AC power supply. To observe this condition, an analog oscilloscope is required. Analog oscilloscopes are also superior when simultaneously observing voltage and current waveforms. In addition, when magnifying a switching waveform for observation on an analog oscilloscope, no complicated operations are required to trigger the waveform.

Quick auto setup (CH1, CH2)
SS-7847A/7840A/7830A/7821A/7811A/7810A, Input signals are quickly shown in the optimum range.

Frequency counter

• All models: 
• 6-digit: SS-7847A/7840A/7830A, 
• 5-digit: SS-7821A/7811A/7805A/7804A/7802A

The built-in 6/5-digit counter is accurate within a range of ±0.0025% / ±0.01% and can measure frequencies between 2Hz and 400MHz. Also shows the trigger signal frequencies.

DC offset function (CH1, CH2), SS-7847A/7840A/7830A
Convenient when you need to observe a signal with very small amplitude superimposed over a signal with large amplitude. Especially useful when observing high-frequency noise superimposed over video signals or ripple of high-voltage DC power supply.

TV/HDTV triggering

• TV: All models, HDTV: SS-7847A/7840A/7830A/7821A/7811A/7810A
• TV-V field (EVEN, ODD, BOTH) and line selection is possible for HDTV, NTSC, PAL/SECAM, meeting the needs of engineers who want to observe HDTV signals without any attenuation (even as low as 0.1 dB).

Pedestal clamp function (CH1, CH2) for TV signals SS-7847A/7840A/7830A
The amplitude of video signals varies dynamically depending on the picture. This function ensures stable observation.

CH2 skew adjust - SS-7847A/7840A/7830A
The delay time of CH2 in response to CH1 can be adjusted with a range of 1 ns. Therefore, accurate measurement is possible by compensating for the delay time difference between the probes.

DC - 470MHz/400MHz/300MHz (all channels) high-sensitivity of 2 mV/div (CH1, CH2) DC - 470MHz (SS-7847A)/DC - 400MHz (SS-7840A)/DC - 300MHz (SS-7830A) for all channels.

CH1 and CH2 have max. sensitivity of 2 mV/div, ensuring extremely high-quality waveforms. IWATSU-developed bright, sharp CRT (Japan made) SS-7847A/7840A/7830A/7821A/7811A/ 7810A/7805A/7804A Features superlative brightness and sharpness that even allows you to easily observe signals with slow repetition and a high-speed rise time transition.

IWATSU-developed preamp IC for improved signal stability

• All models
• To increase signal stability, a preamp circuit has been provided for the IC.
• Panel settings save/recall function
• All models
• To increase signal stability, a preamp circuit has been provided for the IC.
• Event trigger
• All models
• To increase signal stability, a preamp circuit has been provided for the IC.
• Probe power supply provided as standard
• All models
• To increase signal stability, a preamp circuit has been provided for the IC.