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Model l l l 80A
3. Peak detection
4.
Ramp linearity
b.
High speed scanning.
1. Dynamic testing
2. Scanning more than 50 channels
c. Making the DVM's speed independent of the
system's
speed.
1. Computer based system
2. Calculator based system
3-38. A to D conversion applications cover frequencies up
to 500
Hz using Data Storage and Sample-and-Hold op-
tions. Digitization may be carried up to 1000 reading/s. The
TRIGGER SOURCE
COUNTER
TRIGGER TO START STORAGE CYCLE
llllOA· B- 2151
DVM
I
PRINTER
SI~
CHANNEL
PLUG-IN
TRIGGER TO
START
STORAGE CYCLE
TRANSIENT
INPUT
UPTO 50 READINGS -
Figure 3-20. Response Time Measurement.
Transient analysis or response time measurement with triggering at
beginning of transient. Digitization may be carried up to 1000
readings/s .
Section III
2070A Data Logger shown in these applications is the
combination of a 3480A 1 /2 module DVM and the 5055A
1 /2 module printer. All interconnections are made within
the data Jogger. Triggering may come from a pulse
generator, function generator or simple I.C. flip-flop circuit
(shown in Figure 3-18). A counter is used to calibrate the
trigger
source.
3-39. Scanning applications involve the use of the 3485A
Scanning plug-in with up to 50 2-wire inputs and a scanning
speed up to 1000
channels/s.
Data Storage makes this high
scanning speed usable with a printer. Up to 50 channels
may be scanned in 50 ms, stored, then printed out.
3-40. Data Storage may be used to allow the DVM to make
measurements at a speed independent of the system's
speed. Some systems have acquisition rates far below
1000/s while computer based systems are many times
faster. Data Storage is able to output readings at low speeds
or up to 50,000 readings/s.
TRIGGER
SOURCE
>----+-.,~~O-VM-+-1-uPRINTER
SI~
CHANNEL
PLUG-IN
COUNTER
>
1
ms
,....._,
PREVIOUS 10 OR 20 READINGS
PRESET TRIGGER
llllOA·I· 2152
TRANSIENT INPUT
+-LEVEL DETECTOR
I
I
I
I
I
I
I
NEXT40
°'
30
READINGS
LJ
Figure 3-21. Preset Trigger Measurement.
Transient analysis using Preset Trigger to record readings prior to
actual transient. Up to 50 readings may be stored with either the
previous 10 or 20 readings recorded.
3·11
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