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Section
III
3-15.
In
either
de or ohms, these plug-ins
are able
to make
1000 correct readings/s. Within 1 ms, the
3480
is able to
respond to
a
full-scale
change and
digitize. These
single
channel plug-ins
combined with
the
3480
main frame are
able to
act
like
a
low
cost, 1
kHz A-to-D converter. Data
Storage
allows
up to 50 readings taken
at
up to 1000/s to
be stored
and
printed.
3-16.
As
shown
in
Table
3-4,
these plug-ins
contain
their
own sample-rate oscillator
able
to take from 1 reading/s up
to
approximately
40 readings/s. These plug-ins must be
externally triggered (throup,h the main frame) to achieve
higher
sampling
rates.
Table 3-4. Maximum Triggering Rates.
Internal
External
3481A
<(40/s*
<(
1000/s
3482A
<(40/s*
<( 1000/s
3484A
<(40/s*
<(
1000/s
*Variable
front panel sample-rate control, not calibrated.
3-17.
Data Storage
stores
all
of
the information normally
available from the
3480.
Figure 3-9 shows what infor-
mation
is
printed and the format. The format
shown
applies to the
2070A
Data Logger which rearranges the
columns
into an
easier to read order. Decoding for this
information
is given
in Table
3-5.
0 5 4 0 1 1 1 4 2 9
STORA~J l
1
REA~ING
1
l.D.
RANGE
FUNCTION
STORAGE ENABLED
POLARITY/OVER LOAD
x
0 4 0 1 1 1 4 2 9
RANDOM]
l~
NUMBER
READING
ZERO
FUNCTION
STORAGE
NOT ENABLED
RANGE
lllSOA-B-2520
POLARITY /OVERLOAD
Figure 3-9. Printer Format for 2070A Data Logger.
The printer format for a 2070A Data Logger equipped with Data
Storage and a single channel plug-in (3481 A, 3482A or 3484Al. The
first two columns of the print out on a 2070A Data Logger
lose
meaning when Storage is not enabled. The remaining columns
remain the
same.
3-6
Model l l l 80A
Table 3-5. Decoding Output Information for
Single Channel Plug-Ins (3481 A, 3482A, or 3484A).
Range
Code
100mV
1oon
5
1000 mV
1ooon
4
10V
10 kn
3
100
v
100 kn
2
1000
v
1000 kn
1
10Mn
0
Function
Code
VDC
0
AC (AC)
1
OHMS
2
AC (DC)
3
DC RATIO
4
AC (AC) RATIO
5
OHMS RATIO
6
AC (DC) RATIO
7
Polarity /Overload
Code
POSITIVE
0
NEGATIVE
1
POS. OVER LOAD
2
NEG. OVERLOAD
3
3-18. OPERATION WITH SCANNING UNIT.
3-19.
The
3485A
Scanning Unit may be used to scan up to
50 2-wire input and measure each
input
on ranges from
100 m
V
to 10
V.
This scanner
is
designed for low level
transducer applications and uses FET switches to achieve a
speed
of
1000
channels/s.
3-20. Data Storage allows the speed of the
3485A
Scanning
Unit to be used economically with a printer. Up to 50
channels may be scanned and stored in 50 ms then printed
out at 10 lines/s.
3-21. The 3485A may be programmed to scan at any of six
rates from 1 channel/s to 1000 channels/s as selected on the
front panel using Channel Delay. Any number of channels
up to 50 may be scanned using Last Channel settings on the
front panel.
3-22. Figure 3-10 shows whatinformation is printed and the
format. The format shown applies to the 2070A Data
Logger which rearranges the columns into an easier to read
order. Decoding for this information is shown in Table 3-6.
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