Hitachi V-222 Oscilloscope - Page 1
Forum section: electronics / beginners

author: spike47
author_rank: Contributor
timestamp: February 09, 2023, 11:12:39 pm
content: HiHave just got hold of a Hitachi V-222 Oscilloscope, in very good condition, have never used one before so am trying to understand this one, my first question is, why are the Red lights showing (Uncal) for both channels, it just says in the service manual, " When light on VAR is out of CAL detent possition".So how do I get rid of the red lights, or is that normal for them to show all the time.cheersSpike

author: Andy Watson
author_rank: Super Contributor
timestamp: February 09, 2023, 11:28:48 pm
content: The red LEDs are warning you that the channel is uncalibrated. Rotated the channel's gain control to one end or the other - the LED should go out. In this position the gain is "calibrated" and the setting on the switched attenuator is what you see on the screen.

author: bdunham7
author_rank: Super Contributor
timestamp: February 09, 2023, 11:43:47 pm
content: In case that wasn't clear, grab each of the three red knobs and turn them clockwise until they click.I'm not sure what you use it for, but even though it is a pretty basic scope it has a very nice DC offset feature on CH1 that audio specialists and so forth like for looking at power supply issues.

author: james_s
author_rank: Super Contributor
timestamp: February 09, 2023, 11:46:09 pm
content: Those Hitachi scopes are nice. Looks like the trace rotation is a bit off, use a small screwdriver to tweak the rotation control and that should line it up.Be sure to watch Dave's video on how to not blow up your oscilloscope. Also something to note about analog scopes, if you turn the deflection rate way down, be sure to reduce the brightness a bit so you don't burn a spot in the screen.

author: SuzyC
author_rank: Frequent Contributor
timestamp: February 10, 2023, 12:50:39 am
content: Google and you will see several sites offering free download of V-222 scope manual and even service manual!Uhmm...:https://idoc.pub/queue/hitachi-model-v-422-v-222-oscilloscope-operation-manual-5143pxjjx2nj

author: tautech
author_rank: Super Contributor
timestamp: February 10, 2023, 09:27:48 am
content: Quote from: spike47 on February 09, 2023, 11:12:39 pmOnce the red knobs are returned to their Cal positions don't use them and the UnCal lights won't show.Then just use the black part of the timebase and V/div controls and leave the red ones alone, they're red for a reason.

author: EEVblog
author_rank: Unknown
timestamp: February 10, 2023, 09:35:32 am
content: Quote from: james_s on February 09, 2023, 11:46:09 pmYeah I love them. Really sharp trace. Nice score.It was my bench scope at my first job.As others have said, the red knob in the middle of the veritcal controls need to be rotated until it clicks. Only then will your 1V/div etc vertical setting be accurate. This knob is called the vertical vernier, or "fine adjustment". You can also pull the knob out for x5 gain. So the 5mV/div becomes 1mV/div.Same for the Horizontal knob.

author: spike47
author_rank: Contributor
timestamp: February 10, 2023, 04:02:15 pm
content: hiThanks everyone for your feed back, just got it really to check out a Sony Amp and a old Sony Turntable.Never used one before , so it is going to be a long learning curve for me.Ps: Just a quickie what is the "SWP VAR" switch used for ?.cheersSpike

author: wasedadoc
author_rank: Super Contributor
timestamp: February 10, 2023, 04:24:06 pm
content: Quote from: spike47 on February 10, 2023, 04:02:15 pmIt is the horizontal equivalent to the variable red knobs on the Y sensitivity switches. It gives you fine control of the time per horizontal division.

author: EEVblog
author_rank: Unknown
timestamp: February 10, 2023, 10:51:03 pm
content: Quote from: wasedadoc on February 10, 2023, 04:24:06 pmAnd again, if you don't keep it locked in the CAL position then your horizontal timebase or 1us/div etc will not be accurate.These fine vertical and horizontal controls are useful to adjust waveform height and length to match up with the graticule (grid) lines on the screen for convenience and % measurements etc.