User`s guide

Chapter 2 Front Panel Operations RIGOL
M300 User’s Guide
2-37
instrument.
5 Threshold
For TOT channels “S07” and “S08”, after selecting the trigger mode, use the
up/down direction keys to select Threshold and use the numeric keyboard to
input the desired value between -12 V and +12 V.
Note: this function is only applicable to TOT channels “S07” and “S08”. For TOT
channels “S05” and “S06”, the threshold is fixed at CMOS 3.3 V.
The terminal block of the multifunction module provides G and G# terminals
which are used to control the trigger of the TOT channels.
 A TTL high level applied to the G terminal and a TTL low level applied to the
G# terminal enables counting.
 Only providing a TTL high level applied to the G terminal enables counting.
 Only provide a TTL low level applied to the G# terminal enables counting.
 When a gate signal is not detected in both the terminals, counting is always
enabled.
6 Read
Enter the fourth step of the channel configuration guide. Use the up/down
direction keys to select Read and use the left/right direction keys to select the
desired setting.
 READ&RST: read the count and reset the totalizer without losing any
counts.
 READ: only read the count.
Key Points:
1 The maximum count is 4294967295 (2
32
-1). The count rolls over to 0 after
reaching the maximum allowed value.
2 You can configure the instrument to generate an alarm in the specified alarm
channel when a specific count is reached for TOT channel that is not added to
the scale list (the channel status is OFF). Please refer to “Alarm
Configuration” to configure the desired parameters.
3 You can execute single-channel monitor on a TOT channel even if the channel is
not part of the scan list (the channel status is OFF).
4 “S05” and “S06” are high-speed TOT channels with 10 MHz count rate; they only
receive standard TTL pulse or 3.3 V to 5 V square signal and their thresholds are
decided by the internal circuit. “S07” and “S08” are normal TOT channels with
100 kHz count rate. They can receive analog signal or TTL pulse and their
thresholds are set by users (the range is from -12 V to +12 V).