36 34980A Service Guide
2 Specifications
System Specifications and Characteristics
Scanning inputs
Analog 34921A, 34922A, 34923A, 34924A, and 34925A multiplexer
channels
Digital 34950A/52A digital in and totalize
Scan triggering
Source Interval, external, button press, software, or on monitor channel
alarm
Scan count 1 to 50,000 or continuous
Scan interval 0 to 99 hours; 1 ms step size
Channel delay 0 to 60 seconds per channel; 1 ms step size
External trig delay < 2 ms. With monitor on < 200 ms
External trig jitter < 2 ms
Alarms
Analog inputs Hi, Lo, or Hi + Lo evaluated each scan
Digital inputs 34950A/52A digital in maskable pattern match or state change
34950A/52A frequency and totalize: Hi limit only
Monitor channel Alarm evaluated each reading
Alarm outputs 4 TTL compatible
Selectable TTL logic Hi or Lo on fail
Latency 5 ms (typical)
Memory
Type Volatile
Readings 500,000 with timestamp, readable during scan
States 5 instrument states with user label
Alarm queue Up to 20 events with channel number, reading, and timestamp
System features
Per-channel math
min/max/average
Individual Mx+B scaling and calculated real time
Power fail recovery Save switch states
Relay maintenance Counts each relay closure and stores on module,
user resettable
Real-time clock Battery-backed, 20-year typical life
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