XT2640 Operating Manual
13 July 2016
Page 182 of 187
30.4
CYCLE
VIEW
SPECIFICATIONS
Signal Range
As specifications for Voltage and Current
Cycle Period
From 2.3us (W type channels), 8.7us (otherwise) up to 100 seconds
Time Resolution
1/512
th
of a cycle
Method
Mean cycle formed by asynchronously sampling all cycles within measurement period
Maximum Error
As Voltage and Current Specifications for PK data (Watts = multiplication of V and A waveforms)
30.5
SCOPE
SPECIFICATIONS
Signal Range
As specifications for Voltage and Current
Timebase
1/2/5 settings from 5us/div to 20s/div
Capture Depth
Up to 32k points per signal
Capture Resolution
<0.00005% of specified maximum measurable peak Voltage or Current
Sampling Period (nominal) Greater of ‐
1.1µs (W type channels) or 4.1µs (otherwise)
0.03% of timebase setting
Maximum Error
As Voltage and Current Specifications for PK data (Watts = multiplication of V and A waveforms)
30.6
HISTORICAL
DATA
COLLECTION
SPECIFICATIONS
Collection Time
Automatically continuously variable between 1 measurement period and 584.5 million years (collection
is automatically stopped after this time has elapsed but this is untested at the time of writing)
Time Resolution
Note: this is the resolution by which you can determine when an event occurred, not that of the XT2640
detecting events. All events are captured.
The greater of‐
a) 1 pixel of displayed data (front panel) or 1 increment of the requested time interval (interface)
b) 1 measurement period of the data being recorded
c) A maximum of 1/4096
th
of the elapsed historical data collection time (typically 1/8192
th
).
Data Capture
Every measurement is included in the maximum, average and minimum data for each increment of the
time resolution interval regardless of the time resolution.
30.7
DATA
LOGGING
SPECIFICATIONS
Logged Measurements
Up to 16 measurement data per record (each of which can be 1 measurement or up to 500 harmonic
measurements)
Data per Record
Up to 8003 data per record
Internal FIFO Buffer
32Mbyte (always in binary format, 4 bytes per data)
Internal Memory
≥2Gbyte (always in binary format, 4 bytes per data) non‐volatile
Typically 5Mbytes/sec maximum sustained mean write rate
External Data File Format ASCII (CSV, scientific format) or Binary
Timestamp
Record optional date and time (1 second resolution)
Maximum File Size
4Gbyte
Maximum Records
Only limited by maximum file size
Start Delay Time
Zero to 99 days, 99 hours, 99 minutes, 99 seconds (1 second resolution)
0.01% + 8ms maximum error
Run Time
Manual (unrestricted period of time), or 1 second to 99 days, 99 hours, 99 minutes, 99 seconds (1
second resolution)
0.01% + 8ms maximum error
Log Interval
0.002 second, or 0.01 second to 99 hours, 99 minutes, 99.99 seconds (0.01 second resolution)
0.01% maximum error ± 2ms non‐accumulating error
