LCD Scope Firmware Revision History

[ Known Bugs ]

113-06201-200 [ 2010.09.26 ]
Up to 20MSa/s Equivalent-Time Sampling was implemented. Now you are able to see much detailed waveforms that you could not see with earlier version of firmwares. For example, This a 400KHz square signal displayed with 2MSa/s real-time sampling (the maximum of old firmware). And this is the same signal displayed with 20MSa/s equivalent-time sampling.

How to Use:
When time base is set to 2us or faster equivalent-time sampling method is used automatically, regardless of trigger mode setting. However, two conditions must be met before the equivalent-time sampling can work for you. 1 ) The signal to be watched must be a repeative signal. 2 ) Trigs must happen. This is because with equivalent-time sampling a displayed waveform is actually constructed by samples taken at diffenent spots from multiple cycles. Trigs serve as reference points so that correct time relation between samples can be established and waveform can be correctly constructed. If there is no trig you will not be able to see display refreshes. So it is recommended first to use real-time sampling (i.e. setting time base to 5us or slower) to get a rough idea of the signal you are not fimiliar with. Then set to equivalent-time sampling and change trigger level to make trig happen.

Limitation:
1. 062 oscilloscope has only 1MHz analog bandwidth. So you will not be able to see signal higher than that even though the 20MSa/s sampling rate is good for frequency of 3 -4 MHz or higher. This is a bit wasted. But still for signal under 1MHz now you can see much more details that you did not see with old firmware. Look at this 200KHz signal . It was only one division with old firmware and now it is expanded to one full screen.
2. For signals close to 1MHz you will find trig is difficult. This is because there is a Low Pass Filter (R30, C23) for the trigger. The purpose of this filter is for stablizing trigs and its cut-off frequency was set to about 120KHz. For frequency greater than 500KHz signal level is greatly reduced by this filter before reaching the trigger. To solve this problem we can change the values of R30 and C23. For example, R30 can be changed to 470 ohm and C23 to 330pF. But after this change you will find the trig is not that stable for low frequency signals (you may see waveform jumping).

113-06201-101 [ 2010.04.23 ]
Fixed a bug in versions since -092. This bug caused trig output not function properly when time base was set to 5us/DIV.

113-06201-100 [ 2010.04.09 ]
FFT function is added. Features: 1 ) 256 points and 512 points selectable; 2 ) Sampling Rate from 1Ksps to 2Msps selectable.

113-06201-092 [ 2010.03.20 ]
Added trig output. Now it is possible to cascade several oscilloscopes to do multi-channel capture.
Added EEPROM auto setup. EEPROM programming is not required because the firmware will automatically initialize EEPROM if it has not been done.
Removed bootloader detection.
Added codes to generate two pulses at PB2 pin when scope boots. These pulses can drive LED for troubleshooting purpose.

113-06201-091 [ 2009.11.10 ]
"VPos" key replaces "MODE" key to do capture saveing under HOLD state. Now trig mode can be changed under HOLD. This is to avoid the situation where under certain conditions scope is stuck in HOLD at single(SIG) trig mode.

Here is the Bootloader file (No changes).

113-06201-090 [ 2009.09.28 ]
Fixed the known bugs in version -080.

Here are the Bootloader file and EEPROM file.

113-06201-080 [ 2009.07.06 ]
Higher real-time sampling rate - 5Msps (5Msps works in AUTO mode only)
Significant faster display refresh rate
External trig is now available
Save up to 6 captures to EEPROM and retain after power down
Retrieve and display saved captures
Transfer screen to PC as bitmap file via serial connection

Here are the Bootloader file and EEPROM file.

113-06201-070 [ 2009.03.31 ]
Improved ADC timing margin of TLC5510.

Here are the Bootloader file and EEPROM file.

113-06201-060 [ 2008.10.13 ]
Trig position was changed to 1/4 from 1/2 of waveform buffer so that bigger portion of after-trig waveform was displayed. In most cases we are more interested in waveform after trig.
Period measurement feature was taken off since same information can easily be obtained from reading screen. As a result the small wire connecting pin 9 and pin 31 of U4 is unnecessary. For customers who still want this feature please use [113-06205-060] and make sure the small wire is in place.

113-06201-050 [ 2008.09.27 ]
Changes: when a button is pressed waveforms would stay instead of refresh itself as in earlier versions.

113-06201-040