User guide

Isolation rating: 300V CAT II, 500V CAT I between BNC
ground and USB ground
Transient isolation
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: BNC ground to USB ground +/-2.5KV
Isolation capacitance
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: 1000pF typ between BNC ground and USB
ground
Maximum Measured Voltage: Between BNC center and BNC ground: +/-30V.
Absolute Maximum Input Voltage
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: Between BNC center and BNC ground:
148Vrms or 148Vdc.
4.4.2 Static Performance
Input DC resistance: 1Meg Ohm ±2%
Input capacitance: 16pF ±10% at 1MHz
Range accuracy: +/-0.3V range: ±4%
+/-3.0V range: ±6%
+/-30.0V range: ±6%
Input coupling modes: AC, DC, GND
ADC vertical resolution: 8bit
Channel offset error: ±2% of range
Channel offset control: ±100% of range, approx 7bit resolution
Buffer depth: 3000 points
Pre-triggering: Up to 99% of buffer depth
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Post-triggering: Up to 100% of buffer depth
Triggering: Normal, rising edge, falling edge, greater, less
Trigger delay: From 0 to 65535 sample periods
Trigger range: ±100% of range, approx 7bit resolution
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This figure derives from the 300V CAT II isolation rating and defines the peak transient voltage that
can be safely tolerated between the BNC ground and the USB ground.
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This capacitance causes the impedance across the isolation barrier will reduce with frequency. This
is only significant if an AC component is impressed between the BNC ground and the USB ground that
is referenced to the USB ground. At 50/60Hz this impedance is approximately 3MegOhms.
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This level will saturate the scope input, and is the maximum that can be applied without causing
damage to the scope. It applies regardless of the input attenuator or coupling setting.
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Single shot mode only
Elan Digital Systems Ltd. 33 USBscope50 USER’S GUIDE Iss8