6700 Portable Sampler User Manual - Isco

Extended Time Pacing
Screens
The screens illustrated here do
not appear in the same order
that they appear on your
sampler’s display. For charts of
extended pacing screens, see:
Figure 37, Extended Programming:
Pacing and Distribution
on page 123.
Figure 41, Extended Programming:
Quick View; Pacing
and Distribution on page 127.
8
9
10
11
12
13
UNIFORM TIME PACE
FLOW PACED
EVENT PACED
NONUNIFORM TIME
NONUNIFORM TIME:
CLOCK TIMES
INTERVALS IN MINUTES
RANDOM INTERVALS
CLOCK TIMES
TAKE SAMPLES AT:
1. START TIME
2. HH:MM
3. HH:MM
INTERVALS IN MINUTES
FIRST SAMPLE AT
START TIME,
THEN...
QUANTITY AT INTERVAL
1. __ AT ___ MIN
2. __ AT ___ MIN
3. __ AT ___ MIN
RANDOM INTERVALS
PROGRAM RUN TIME:
__ HOURS, __ MINUTES
6700 SAMPLERS
Trigger Pacing
Isco 4200 Series Flow Meters and 4100 Series Flow Loggers send
pulses for trigger pacing. The flow meter or flow logger sends
pulses at two different time intervals when trigger pacing a sampler.
Trigger pacing, for example, lets you sample less frequently
when the trigger condition — level, flow, or rainfall — remains
below a set point. The intervals are determined by the flow
instrument’s program settings for trigger pacing.
When conditions change and readings pass the set point, triggering
the new rate, you can sample more frequently. Or, when the
trigger condition is a clock setting, the instrument changes the
pacing interval according to the time of day. Using a clock trigger
condition, for instance, the flow meter or flow logger can pace the
sampler slowly at night and more frequently during the day. (For
more information about trigger pacing, see your flow meter or
FLOWLINK manual.)
The flow meter or flow logger sends the same pulse for both flow
and trigger pacing, and the sampler cannot distinguish between
them. Therefore, to program a sampler for trigger pacing, simply
program it for flow pacing.
PACING IN EXTENDED PROGRAMMING
Both standard and extended programming provide time and flow
pacing, but extended programming adds a feature to flow paced
sampling programs by letting you program the sampler to take a
sample at the start time. Also, extended programming provides
nonuniform time pacing as well as event pacing.
Extended Time Pacing
The extended time pacing options are uniform time and nonuniform
time. “Uniform time” pacing is identical to “time” pacing in
standard programming. Nonuniform time pacing uses an irregular
interval between sample events; each interval is individually
programmable. There are three types of nonuniform time pacing:
Nonuniform clock time pacing.
Nonuniform interval pacing.
Random interval pacing.
Nonuniform Clock Time Pacing
For clock time pacing, enter specific times for each sample event.
(See screen 10.) You can enter as many as 99 clock times, but the
interval between times cannot be greater than 24 hours.
(Remember to use a 24-hour clock when entering times.) The
sampler takes a sample at the start time.
Nonuniform Interval Pacing
For nonuniform interval pacing, enter the number of sample
events spaced at intervals of minutes: 12 samples at 5 minute
intervals, 6 samples at 10 minute intervals, and so on. The sampler
accepts as many as 99 nonuniform interval entries. The
sampler takes a sample at start time.
83