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2638A
Users Manual
4-4
• The total channel sample time is the minimum sample time plus the user-
programmed channel delay. The longer the channel delay, the longer it takes to
sample the channel.
• The total scan sweep time is sum of the channel sample times of all the channels
scanned. A scan sweep will start when the selected trigger source is asserted if a
previous scan sweep is not still in progress (see "Trigger Type" on page 4-6).
• The interval at which scan sweeps occur can be fixed by programming the trigger
type to Timer and setting an interval time.
Channel List
SCAN START
Channel 102
Channel 104
Channel 115
Channel Delay Set
Channel 117
Channel Delay Set
Channel 121
- Sample Time*Key:
*Consists of NPLC time, settling time, and ADC samples.
- Channel Delay
Sweep Time
SCAN FINISH
Sweep Time
Scan Cycle 1
Scan Cycle 2
Scan IntervalScan Interval
Remaining
Interval
Remaining
Interval
Remaining
Interval
hcn050.eps
Figure 4-2. Illustration of a Scan Sweep
Table 4-2. Settling Time Delay Values
Type and Range Time Delay
100 mV dc 0 ms
1 V dc 0 ms
10 V dc 0 ms
100 V dc 100 ms
300 V dc 100 ms
ACV all ranges 20 Hz filter 400 ms
ACV all ranges 200 Hz filter 100 ms
A dc (all ranges) 0 ms
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