Service Manuals generally provide information and instructions pertaining to product disassembly, schematic diagrams, parts lists, exploded views, troubleshooting guides, wiring diagrams, and much, much more. Not all appliances and electronics have Tech Sheets or Fast Track publications. Training Manuals generally contain more in-depth servicing information and circuit explanations. Not all appliances and electronics have Training Manuals. The button s show the contents of the info block s and allows you to upload new data to them, should you wish.
When the button is clicked, the following is displayed:. A file containing the desired InfoBlock text can be uploaded by clicking the button: the web-browser's normal upload facility is used.
Clicking the button returns the display to the previous state. The next section of the screen controls the filtering mode of the digitiser and optionally enables strong motion calculations.
In this mode, the last stage of the digital filtering is changed from finite impulse response FIR, acausal to infinite impulse response IIR, causal and packets are output each second at twenty samples per second in order to achieve very near real time data. These modes cannot be selected unless the first decimator output is set to two hundred samples per second.
The button is enabled only when this condition is satisfied. The DM24 uses the calibration information from the InfoBlock see section 8. The InfoBlock must be correctly populated for this to work. The acquisition system demultiplexes the strong motion packets and generates individual GCF streams for each type of data. Because GCF streams can only carry integer values, the floating point values from the strong motion packets are each multiplied by before being packed as GCF data.
Strong motion mode requires that the highest tap the one with the fastest sample rate is set to samples per second. The sps data are passed through a fast-response, divide-by-ten IIR filter in order to produce the low-latency 20 sps data which are used for the calculations.
This 20 sps low-latency stream can be enabled for direct output: it's stream ID will have the suffix 'E'. Strong motion mode can be configured using buttons on the web page.
If the highest tap is configured for samples per second operation, the following is displayed:. If the highest tap is not set to samples per second, an additional button is displayed:. The first reconfigures the taps so that the highest tap is set to samples per second and then enables strong motion mode.
If the highest tap is already set to samples per second, the button is active and, when clicked, enables strong motion mode. The last filter in a decimation chain has the biggest effect on the overall latency of the chain. Scroll to the bottom of the page and click. Once the digitiser has rebooted, a new section appears on the screen, as shown below:. The causal filter may be disabled by clicking the button, then scrolling to the bottom of the page and clicking.
Compression mode: Controls how samples are packed, affecting both data latency and line utilisation. GCF packets contain a bit starting value and then a series of differences between consecutive samples. When the input signal is relatively quiet, these differences can often be expressed as 8-bit quantities. When the input signal includes large transients, the differences are transmitted as bit quantities.
For intermediate level signals, bit values can be used. The digitiser can be configured to limit the amount of compression used, decreasing latency. The difference values are stored in records, which are four bytes long and, so, may contain four 8-bit differences, two bit differences or one bit difference.
A GCF packet can contain up to records so the maximum number of samples in a packet is between when bit differences are used and for eight-bit differences. Packets must start on whole-second boundaries, so they are not always filled.
In addition, it is possible to configure the digitiser to further restrict the number of records in a packet in order to decrease latency. The drop-down menu controls both of these settings and normally offers the following choices:. Recommended for sps or less 8 bit 20 records, maximum 80 samples : - Represents the best compromise for throughput: allowing 8-bit compression potentially increases the number of samples per packet and limiting packets to twenty records guarantees reasonably low latency.
Maximum, recommended for sps or more 8 bit records, maximum samples : - Optimises line utilisation, allowing maximum compression and minimising the number of packet headers transmitted. Minimum for lowest latency 32 bit 5 samples : - Disables compression, forcing samples to be transmitted as bit differences. Latency is reduced by limiting the number of records to one per packet.
If the system is connected to a digitiser that is using a different combination of compression control and sample limits, it will appear as an extra item in the drop-down menu, labelled Custom. For example: Custom bit 40 samples max would appear if these settings had been manually configured from the digitiser's command line.
The decimator outputs control which digitiser taps have been configured to output data, both in continuous and triggered states. On four-channel digitisers, only the columns Z, N, E and X are displayed. An optional Highpass filter can be applied to eliminate the effect of any DC offset in the sensor's output. The available corner frequencies, , and seconds, can be selected from the drop-down menu.
The table below the filter configuration shows the currently configured continuous and triggered outputs with components in columns and taps in rows. The number of output columns increases when using seven-channel digitisers. Extra taps can be added with the button. The rates available at each tap are dependant on the rate selected at the previous tap: the base sampling rate is samples per second and each tap can be configured to divide this by either 2, 4 or 5. The available rates are shown in the table below, along with a way to configure each, although there are sometimes very many different ways to configure any given rate.
The triggering settings are normally hidden but can be revealed by clicking the or button. The following extra dialogues are displayed:. Muziekschuur , Jul 9, He his probably very well famed. I have had the confirmation I was right from the Tascam tech here in France.
Never mind, the tech said this parameter is now useless and the flash memory will never been changed any more on an obsolete desk. I have always been polite with him, and I got "stubborn, newbee" and other pleasant words in another thread. That's not fair from this man not being an engineer in electronics I am aware. Berl, at the very least you have to read the documents, which are on Tascam's website, which we all followed to reset our consoles and upgrade the operating system.
If you're a tech, you should be more careful with your advice. There are two of them. Two, Dude! Will Miho , Jul 9, The Service Manual info you posted Berl, written back at firmware V1. Will is absolutely right in this respect. I myself used the Tascam docs a lot of times to reset my console or reseat the eproms.
Became the exact same error while trying to store or load library entries. What I did, after reading this forum and all Tascam docs, opened it up and reseated the three eproms. Problem was gone forever. Its been awhile since I have been on here and I do appreciate your answers, I tried a few things but ended up buying another one on ebay but I am going to try and fix the other so I have it as a back up Thanks again.
Hi there folks! I bought them and installed them. They got my DM24 working like new again. ElectroniZZer , Dec 10, The contacts oxidize in the PROM sockets.
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