5-92 B90 LOW IMPEDANCE BUS DIFFERENTIAL SYSTEM – INSTRUCTION MANUALPRODUCT SETUP CHAPTER 5: SETTINGS5Oscillography records contain waveforms captured at the sampling rate as well as other relay data at the point of trigger.Oscillography records are triggered by a programmable FlexLogic operand. Multiple oscillography records can be capturedsimultaneously.The NUMBER OF RECORDS is selectable, but the number of cycles captured in a single record varies considerably based onother factors, such as sample rate and the number of operational modules. There is a fixed amount of data storage foroscillography; the more data captured, the less the number of cycles captured per record. See the ACTUAL VALUES RECORDS OSCILLOGRAPHY menu to view the number of cycles captured per record. The following table provides sampleconfigurations with corresponding cycles/record. The minimum number of oscillographic records is three.Table 5-13: Oscillography cycles/record exampleTRIGGER MODE — A new record automatically overwrites an older record when TRIGGER MODE is set to “AutomaticOverwrite.”TRIGGER POSITION — Set this to a percentage of the total buffer size (for example, 10%, 50%, 75%, and so on). A triggerposition of 25% consists of 25% pre- and 75% post-trigger data.TRIGGER SOURCE — Always captured in oscillography and can be any FlexLogic parameter (element state, contact input,virtual output, and so on). The relay sampling rate is 64 samples per cycle.AC INPUT WAVEFORMS — Determines the sampling rate at which AC input signals (that is, current and voltage) are stored.Reducing the sampling rate allows longer records to be stored. This setting has no effect on the internal sampling rate ofthe relay, which is always 64 samples per cycle. That is, it has no effect on the fundamental calculations of the device.5.3.9.2 Digital channelsSETTINGS PRODUCT SETUP OSCILLOGRAPHY DIGITAL CHANNELSDIGITAL 1(63) CHANNEL — This setting selects the FlexLogic operand state recorded in an oscillography trace. The length ofeach oscillography trace depends in part on the number of parameters selected here. Parameters set to “Off” are ignored. DIGITAL CHANNELSSee below ANALOG CHANNELSSee belowRecords CT/VTs Sample rate DigitalchannelsAnalogchannelsCycles perrecord3 1 32 32 16 23993 1 64 32 16 145016 1 32 32 16 66616 1 64 32 16 40232 1 32 32 16 35232 1 64 32 16 2133 2 32 32 16 15163 2 64 32 16 85116 2 32 32 16 421When changes are made to the oscillography settings, all existing oscillography records are cleared. DIGITAL CHANNELS DIGITAL CHANNEL 1:OffRange: FlexLogic operand DIGITAL CHANNEL 63:OffRange: FlexLogic operand
