Multichannel Systems USB-ME64-128-256-Systems Manual - Manual (Page 26)

USB-ME-System Manual
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5.8
Cable Connection not correct / No Recording Possible
You cannot establish a signal from the amplifier. The USB-ME-System channel layout
in MC_Rack shows 50 Hz hum only.
Possible causes:
? The cable connection from the computer to the periphery is not complete.
68-pin MCS standard connectors need to be fixed in the provided plugs by a firm connection.
Otherwise no data transfer is possible.
Check the MCS high grade cable, and the 68-pin MCS standard connectors.
If this does not solve the problem, contact your local retailer for support.
? The cable connection from the computer to the periphery is not correct.
Make sure not to mistake inputs for outputs in the connected devices.
5.9 Triggering / Digital Input does not Work
You have connected a TTL source (for example, the Sync Out of a stimulus generator) to
the digital output D0 of the USB-ME-System, 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 TTL level), or the TTL pulse duration
is too short in combination with the sampling rate, so that the pulse is missed in-between two
data points.
The USB-ME-System can only accept TTL signals (5 V TTL level) as a digital input stream.
The TTL pulse needs to be optimized according to the sampling rate. Otherwise, a detection
of the trigger cannot be 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 pin layout of the digital IN / OUT connector 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.