Daqarta for DOS Contents
programmable gain boards, each channel may have its own Range when range tracking is set to Independent mode. Changing the channel will then change the Range to its previous setting for that channel.
programmable gain model, this control will allow you to change input sensitivity. Only bipolar (+/-) ranges may be selected, even if your model also allows unipolar ranges, since unipolar ranges are of no advantage with Daqarta. The scrollable range selections will be adjusted automatically according to your board model.
Programmable gain models can also make use of Independent range tracking mode, such that you may set a different range for each channel. When you change channels, the range will be set automatically to the previously set value.
For fixed-gain models like the DAS-8 and DAS-8/LT, this item will stay at 5.0 V and be inaccessible to the cursor.
For the DAS08 or CYDAS 8 with switch-selectable gain, this control will serve to tell Daqarta which range you have set manually. There is no support on this board for reading the switch settings via software, so Daqarta won't know unless you tell it. Since the switches are on the typically hard-to-reach rear of the system, you will probably want to set this control via the Range parameter on the configuration line and just ignore it. But the control does remain active, just in case you do need to change things while operating.
Only with the switch-selectable models does this control allow a unipolar range (0->10 V), since if you need to have this range set for some other application, you probably don't want to crawl behind the system to change it just for Daqarta. The trace Y-axis will show an apparent bipolar +/- 10 Volt range, but the waveform will naturally never go below zero. If your data varies about some positive voltage, like +5 Volts, you may want to use the Zero option key to remove the DC value and make it appear to swing about zero Volts. This will allow you to use trace magnification to see smaller details, without magnifying them right off the top of the screen.
programmable gain models only, this control allows for Independent range selection for each channel. Then whenever you change to that channel, the range changes to match.
Alternately, if you toggle this control to All, then all channels will have whatever Range is set.
On fixed and switch-selectable models this control is not accessible and is permanently set to All.
trace magnification, these modes will probably look pretty much alike. At higher magnifications, you will be able to see more of a "stair-step" appearance in the 8-bit mode.
Is 12-bit always better than 8-bit? Define "better". Each has its own advantages, but in general you should probably use 12-bit mode wherever possible. Reserve 8-bit mode for instances when you need higher sample rates than you can get from 12-bit, or for when you will be recording long DDisk files and want to save space.
If you will be using waveform averaging with much more than 16 sweeps, you probably will not see any difference at all between 8 and 12 bits. That's because if the noise is larger than the ADC resolution, then at finer resolutions there is nothing more to resolve but noise. Any detail that you want to recover must come from averaging, not ADC resolution, so there is no clear advantage to the 12-bit mode. And, via the miracle of dither, you can recover any amount of detail that you want as long as you are willing to average enough sweeps.
HOWEVER, this comparison assumes that both signals are set to give full-scale inputs. In practice this is difficult to do, since the nature of your noisy signals may leave the upper and lower limits somewhat ambiguous. If you exceed the input limits, the result is clipping which can contaminate your data. Any data that gets clipped off can't contribute its share to an average and is lost.
Particularly severe problems occur with many biological signals having large low-frequency noise excursions that make the desired signal ride all over the range. In these conditions you will probably want to use artifact rejection to avoid trying to average the wilder traces, but in addition you can go to a 16-times less sensitive range in 12-bit mode and get the same resolution as 8-bit, but with a bigger range to wander before clipping.
external trigger. Only the 3 "normal" input bits available on all DAS8X-type boards may be used here, not those from any extra LPT or 8255 ports.
remote control to start and stop DDisk recording. Make sure this bit is not the same one used for Averager Remote or External Trigger.
remote control to start and stop the Averager. Make sure this bit is not the same one used for DDisk Remote or External Trigger.
Trigger Pulse source.
DAS08 .------. +10V Ref | 19 \ LL Gnd | 18 37 | Ch0 In LL Gnd | 17 36 | Ch1 In LL Gnd | 16 35 | Ch2 In LL Gnd | 15 34 | Ch3 In LL Gnd | 14 33 | Ch4 In LL Gnd | 13 32 | Ch5 In LL Gnd | 12 31 | Ch6 In (Dig Com) | 11 30 | Ch7 In Dig Out 4 | 10 29 | + 5 V Pwr Dig Out 3 | 9 28 | Dig Gnd Dig Out 2 | 8 27 | Dig In 3 Dig Out 1 | 7 26 | Dig In 2 Cntr 2 Out | 6 25 | Dig In 1 Cntr 1 Out | 5 24 | Interrupt In Cntr 1 In | 4 23 | Cntr 2 Gate Cntr 0 Out | 3 22 | Cntr 1 Gate Cntr 0 In | 2 21 | Cntr 0 Gate + 12 V Pwr | 1 20 | - 12 V Pwr | / `------'
DAS08-PGH or -PGL .------. Ch0 Low | 19 \ Ch1 Low | 18 37 | Ch0 High Ch2 Low | 17 36 | Ch1 High Ch3 Low | 16 35 | Ch2 High Ch4 Low | 15 34 | Ch3 High Ch5 Low | 14 33 | Ch4 High Ch6 Low | 13 32 | Ch5 High Ch7 Low | 12 31 | Ch6 High (LL Gnd) | 11 30 | Ch7 High Dig Out 4 | 10 29 | + 5 V Pwr Dig Out 3 | 9 28 | Dig Gnd Dig Out 2 | 8 27 | Dig In 3 Dig Out 1 | 7 26 | Dig In 2 Cntr 2 Out | 6 25 | Dig In 1 Cntr 1 Out | 5 24 | Interrupt In Cntr 1 In | 4 23 | Cntr 2 Gate Cntr 0 Out | 3 22 | Cntr 1 Gate Cntr 0 In | 2 21 | Cntr 0 Gate + 12 V Pwr | 1 20 | - 12 V Pwr | / `------'
DAS08-AOH or -AOL .------. Ch0 Low | 19 \ Ch1 Low | 18 37 | Ch0 High Ch2 Low | 17 36 | Ch1 High Ch3 Low | 16 35 | Ch2 High Ch4 Low | 15 34 | Ch3 High Ch5 Low | 14 33 | Ch4 High Ch6 Low | 13 32 | Ch5 High Ch7 Low | 12 31 | Ch6 High (LL Gnd) | 11 30 | Ch7 High Dig Out 4 | 10 29 | + 5 V Pwr Dig Out 3 | 9 28 | Dig Gnd Dig Out 2 | 8 27 | Dig In 3 Dig Out 1 | 7 26 | Dig In 2 Cntr 2 Out | 6 25 | Dig In 1 Cntr 1 Out | 5 24 | Interrupt In Cntr 1 In | 4 23 | Cntr 2 Gate Cntr 0 Out | 3 22 | Cntr 1 Gate Cntr 0 In | 2 21 | DAC LL Gnd DAC 1 Out | 1 20 | DAC 0 Out | / `------'
8255 Parallel Port .------. Gnd | 19 \ + 5 V | 18 37 | PA0 Gnd | 17 36 | PA1 + 12 V | 16 35 | PA2 Gnd | 15 34 | PA3 - 12 V | 14 33 | PA4 Gnd | 13 32 | PA5 - 5 V | 12 31 | PA6 Gnd | 11 30 | PA7 PB0 | 10 29 | PC0 PB1 | 9 28 | PC1 PB2 | 8 27 | PC2 PB3 | 7 26 | PC3 PB4 | 6 25 | PC4 PB5 | 5 24 | PC5 PB6 | 4 23 | PC6 PB7 | 3 22 | PC7 (NC) | 2 21 | Gnd (NC) | 1 20 | + 5 V | / `------'NOTE: Pins 1 and 2 are shown (NC) to reflect the usage of the "built-in" 8255 for DAS08 and DAS08-AOx boards. For separate 8255 board like the PIO-12 and PIO-24 these pins are used for Interrupt Input (1) and Interrupt Disable (2), not used by this driver.
LPT PRINTER PORT .------. Select | 13 \ Paper Out | 12 25 | Gnd Busy | 11 24 | Gnd -Ack | 10 23 | Gnd D7 | 9 22 | Gnd D6 | 8 21 | Gnd D5 | 7 20 | Gnd D4 | 6 19 | Gnd D3 | 5 18 | Gnd D2 | 4 17 | -Select Input D1 | 3 16 | -Init D0 | 2 15 | -Error -Strobe | 1 14 | -Auto Feed | / `----- 'NOTE: Only D0 through D7 outputs (and the grounds) are used by this driver for STIM3 Digital Output (DigOut).
3-1-01 Added support for STIM3A Dynamic Mode, update for Daqarta v2.00. 7-17-98 Requires Daqarta version 1.11 or greater. Bug Fix: Changes made to certain main Daqarta (or STIM3) controls while Paused now take effect properly after unPause. Pulse output is now terminated during Pause. Cursor readout averages now reset automatically when changing input or stimulus output settings. 8-6-97 Original Release.
Channel Control Channel Preset Parameter C: Configuration Parameters Connector Pinout Diagrams Conversion Speed Parameter S:
DAC Updates, Simultaneous Digital Outputs, 8255 Ports Digital Outputs, LPT Port DDisk Remote Control Bit
Gain, Channel / Range Parameter Interactions Gain, Programmable Models Gain (Range) Control Gain (Range) Preset Parameter R: Gain (Range) Tracking
Independent Range Tracking Information Summary, Board Input Range Control Input Range Preset Parameter R: Introduction - Supported Models and Features IRQ (Interrupt Request) Parameter I:
Pacer, External Parallel Port Address Parameter P: Parallel Port Connector Pinouts Parameters, Configuration Parameter Overview Pinouts, Connector Pulse Output Bit
Range Control Range Preset Parameter R: Range Switches, DAS08 board Range Table Range Tracking Control Range Tracking vs C: and R: Parameter Order Remote Control Bit, Averager Remote Control Bit, DDisk Revision History
Sample Rate vs Bits Simultaneous DAC update Speed, Conversion Parameter S: Stimulus Generation, Oversampling and Hypersampling Stimulus Generation with 8255 Port Outputs Stimulus Generation with LPT Outputs Summary, Board Information Supported Models Switches, DAS08 Range
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