Multichannel Systems ME-System Manual - Manual (Page 23)

Troubleshooting
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3 Troubleshooting
3.1 About Troubleshooting
The following hints are provided to solve special problems that have been reported by users.
Most problems occur seldom and only under specific circumstances. Please check the mentioned
possible causes carefully when you have any trouble with the product. In most cases, it is only
a minor problem that can be easily avoided or solved.
If the problem persists, please contact your local retailer. The highly qualified staff will be glad
to help you. Please inform your local retailer as well, if other problems that are not mentioned
in this documentation occur, even if you have solved the problem on your own. This helps other
users, and it helps MCS to optimize the instrument and the documentation.
Please pay attention to the safety and service information in the separate manuals of the
related products and in the software help. Multi Channel Systems has put all effort into making
the product fully stable and reliable, but like all high-performance products, it has to be handled
with care.
3.2 Triggering / Digital Input does not work
You have connected a TTL source (for example, the SyncOut of a stimulus generator) to the
digital input of the MC_Card or the USB based data acquisition, and configured the virtual rack
in MC_Rack for triggering displays or data acquisition by the TTL source, but you do not see any
sweeps.
Possible causes:
? The TTL source does not generate true TTL signals (5 V), or the TTL pulse is shorter than 200 μs.
 The hardware can only accept TTL signals (CMOS 5 V TTL level) as a digital input stream.
A minimum TTL pulse of 200 μs is recommended. Otherwise, a detection of the trigger
by the hardware is not guaranteed.
? The software settings for the Trigger Detector do not match with the hardware configuration.
 In MC_Rack, add a Trigger Detector to your virtual rack, and select the Digital Data D1 input
stream as the Trigger. Check the digital inputs and make sure that the same bit input that is
connected is selected in the software. (The standard settings of the Trigger Detector are for
using bit 0). Mask all unused bits. Select the appropriate logical state (generally HIGH) for
triggering. Please see the MC_Rack Help or Manual for more details.